git.sesse.net Git - movit/blob - effect_chain.cpp

   1 #include <epoxy/gl.h>
   2 #include <assert.h>
   3 #include <math.h>
   4 #include <stddef.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <algorithm>
   9 #include <set>
  10 #include <stack>
  11 #include <utility>
  12 #include <vector>
  13 #include <Eigen/Core>
  14
  15 #include "alpha_division_effect.h"
  16 #include "alpha_multiplication_effect.h"
  17 #include "colorspace_conversion_effect.h"
  18 #include "dither_effect.h"
  19 #include "effect.h"
  20 #include "effect_chain.h"
  21 #include "effect_util.h"
  22 #include "gamma_compression_effect.h"
  23 #include "gamma_expansion_effect.h"
  24 #include "init.h"
  25 #include "input.h"
  26 #include "resource_pool.h"
  27 #include "util.h"
  28 #include "ycbcr_conversion_effect.h"
  29
  30 using namespace Eigen;
  31 using namespace std;
  32
  33 namespace movit {
  34
  35 namespace {
  36
  37 // An effect whose only purpose is to sit in a phase on its own and take the
  38 // texture output from a compute shader and display it to the normal backbuffer
  39 // (or any FBO). That phase can be skipped when rendering using render_to_textures().
  40 class ComputeShaderOutputDisplayEffect : public Effect {
  41 public:
  42         ComputeShaderOutputDisplayEffect() {}
  43         string effect_type_id() const override { return "ComputeShaderOutputDisplayEffect"; }
  44         string output_fragment_shader() override { return read_file("identity.frag"); }
  45         bool needs_texture_bounce() const override { return true; }
  46 };
  47
  48 }  // namespace
  49
  50 EffectChain::EffectChain(float aspect_nom, float aspect_denom, ResourcePool *resource_pool)
  51         : aspect_nom(aspect_nom),
  52           aspect_denom(aspect_denom),
  53           output_color_rgba(false),
  54           num_output_color_ycbcr(0),
  55           dither_effect(nullptr),
  56           ycbcr_conversion_effect_node(nullptr),
  57           intermediate_format(GL_RGBA16F),
  58           intermediate_transformation(NO_FRAMEBUFFER_TRANSFORMATION),
  59           num_dither_bits(0),
  60           output_origin(OUTPUT_ORIGIN_BOTTOM_LEFT),
  61           finalized(false),
  62           resource_pool(resource_pool),
  63           do_phase_timing(false) {
  64         if (resource_pool == nullptr) {
  65                 this->resource_pool = new ResourcePool();
  66                 owns_resource_pool = true;
  67         } else {
  68                 owns_resource_pool = false;
  69         }
  70
  71         // Generate a VBO with some data in (shared position and texture coordinate data).
  72         float vertices[] = {
  73                 0.0f, 2.0f,
  74                 0.0f, 0.0f,
  75                 2.0f, 0.0f
  76         };
  77         vbo = generate_vbo(2, GL_FLOAT, sizeof(vertices), vertices);
  78 }
  79
  80 EffectChain::~EffectChain()
  81 {
  82         for (unsigned i = 0; i < nodes.size(); ++i) {
  83                 delete nodes[i]->effect;
  84                 delete nodes[i];
  85         }
  86         for (unsigned i = 0; i < phases.size(); ++i) {
  87                 resource_pool->release_glsl_program(phases[i]->glsl_program_num);
  88                 delete phases[i];
  89         }
  90         if (owns_resource_pool) {
  91                 delete resource_pool;
  92         }
  93         glDeleteBuffers(1, &vbo);
  94         check_error();
  95 }
  96
  97 Input *EffectChain::add_input(Input *input)
  98 {
  99         assert(!finalized);
 100         inputs.push_back(input);
 101         add_node(input);
 102         return input;
 103 }
 104
 105 void EffectChain::add_output(const ImageFormat &format, OutputAlphaFormat alpha_format)
 106 {
 107         assert(!finalized);
 108         assert(!output_color_rgba);
 109         output_format = format;
 110         output_alpha_format = alpha_format;
 111         output_color_rgba = true;
 112 }
 113
 114 void EffectChain::add_ycbcr_output(const ImageFormat &format, OutputAlphaFormat alpha_format,
 115                                    const YCbCrFormat &ycbcr_format, YCbCrOutputSplitting output_splitting,
 116                                    GLenum output_type)
 117 {
 118         assert(!finalized);
 119         assert(num_output_color_ycbcr < 2);
 120         output_format = format;
 121         output_alpha_format = alpha_format;
 122
 123         if (num_output_color_ycbcr == 1) {
 124                 // Check that the format is the same.
 125                 assert(output_ycbcr_format.luma_coefficients == ycbcr_format.luma_coefficients);
 126                 assert(output_ycbcr_format.full_range == ycbcr_format.full_range);
 127                 assert(output_ycbcr_format.num_levels == ycbcr_format.num_levels);
 128                 assert(output_ycbcr_format.chroma_subsampling_x == 1);
 129                 assert(output_ycbcr_format.chroma_subsampling_y == 1);
 130                 assert(output_ycbcr_type == output_type);
 131         } else {
 132                 output_ycbcr_format = ycbcr_format;
 133                 output_ycbcr_type = output_type;
 134         }
 135         output_ycbcr_splitting[num_output_color_ycbcr++] = output_splitting;
 136
 137         assert(ycbcr_format.chroma_subsampling_x == 1);
 138         assert(ycbcr_format.chroma_subsampling_y == 1);
 139 }
 140
 141 void EffectChain::change_ycbcr_output_format(const YCbCrFormat &ycbcr_format)
 142 {
 143         assert(num_output_color_ycbcr > 0);
 144         assert(output_ycbcr_format.chroma_subsampling_x == 1);
 145         assert(output_ycbcr_format.chroma_subsampling_y == 1);
 146
 147         output_ycbcr_format = ycbcr_format;
 148         if (finalized) {
 149                 YCbCrConversionEffect *effect = (YCbCrConversionEffect *)(ycbcr_conversion_effect_node->effect);
 150                 effect->change_output_format(ycbcr_format);
 151         }
 152 }
 153
 154 Node *EffectChain::add_node(Effect *effect)
 155 {
 156         for (unsigned i = 0; i < nodes.size(); ++i) {
 157                 assert(nodes[i]->effect != effect);
 158         }
 159
 160         Node *node = new Node;
 161         node->effect = effect;
 162         node->disabled = false;
 163         node->output_color_space = COLORSPACE_INVALID;
 164         node->output_gamma_curve = GAMMA_INVALID;
 165         node->output_alpha_type = ALPHA_INVALID;
 166         node->needs_mipmaps = Effect::DOES_NOT_NEED_MIPMAPS;
 167         node->one_to_one_sampling = false;
 168         node->strong_one_to_one_sampling = false;
 169
 170         nodes.push_back(node);
 171         node_map[effect] = node;
 172         effect->inform_added(this);
 173         return node;
 174 }
 175
 176 void EffectChain::connect_nodes(Node *sender, Node *receiver)
 177 {
 178         sender->outgoing_links.push_back(receiver);
 179         receiver->incoming_links.push_back(sender);
 180 }
 181
 182 void EffectChain::replace_receiver(Node *old_receiver, Node *new_receiver)
 183 {
 184         new_receiver->incoming_links = old_receiver->incoming_links;
 185         old_receiver->incoming_links.clear();
 186
 187         for (unsigned i = 0; i < new_receiver->incoming_links.size(); ++i) {
 188                 Node *sender = new_receiver->incoming_links[i];
 189                 for (unsigned j = 0; j < sender->outgoing_links.size(); ++j) {
 190                         if (sender->outgoing_links[j] == old_receiver) {
 191                                 sender->outgoing_links[j] = new_receiver;
 192                         }
 193                 }
 194         }
 195 }
 196
 197 void EffectChain::replace_sender(Node *old_sender, Node *new_sender)
 198 {
 199         new_sender->outgoing_links = old_sender->outgoing_links;
 200         old_sender->outgoing_links.clear();
 201
 202         for (unsigned i = 0; i < new_sender->outgoing_links.size(); ++i) {
 203                 Node *receiver = new_sender->outgoing_links[i];
 204                 for (unsigned j = 0; j < receiver->incoming_links.size(); ++j) {
 205                         if (receiver->incoming_links[j] == old_sender) {
 206                                 receiver->incoming_links[j] = new_sender;
 207                         }
 208                 }
 209         }
 210 }
 211
 212 void EffectChain::insert_node_between(Node *sender, Node *middle, Node *receiver)
 213 {
 214         for (unsigned i = 0; i < sender->outgoing_links.size(); ++i) {
 215                 if (sender->outgoing_links[i] == receiver) {
 216                         sender->outgoing_links[i] = middle;
 217                         middle->incoming_links.push_back(sender);
 218                 }
 219         }
 220         for (unsigned i = 0; i < receiver->incoming_links.size(); ++i) {
 221                 if (receiver->incoming_links[i] == sender) {
 222                         receiver->incoming_links[i] = middle;
 223                         middle->outgoing_links.push_back(receiver);
 224                 }
 225         }
 226
 227         assert(middle->incoming_links.size() == middle->effect->num_inputs());
 228 }
 229
 230 GLenum EffectChain::get_input_sampler(Node *node, unsigned input_num) const
 231 {
 232         assert(node->effect->needs_texture_bounce());
 233         assert(input_num < node->incoming_links.size());
 234         assert(node->incoming_links[input_num]->bound_sampler_num >= 0);
 235         assert(node->incoming_links[input_num]->bound_sampler_num < 8);
 236         return GL_TEXTURE0 + node->incoming_links[input_num]->bound_sampler_num;
 237 }
 238
 239 GLenum EffectChain::has_input_sampler(Node *node, unsigned input_num) const
 240 {
 241         assert(input_num < node->incoming_links.size());
 242         return node->incoming_links[input_num]->bound_sampler_num >= 0 &&
 243                 node->incoming_links[input_num]->bound_sampler_num < 8;
 244 }
 245
 246 void EffectChain::find_all_nonlinear_inputs(Node *node, vector<Node *> *nonlinear_inputs)
 247 {
 248         if (node->output_gamma_curve == GAMMA_LINEAR &&
 249             node->effect->effect_type_id() != "GammaCompressionEffect") {
 250                 return;
 251         }
 252         if (node->effect->num_inputs() == 0) {
 253                 nonlinear_inputs->push_back(node);
 254         } else {
 255                 assert(node->effect->num_inputs() == node->incoming_links.size());
 256                 for (unsigned i = 0; i < node->incoming_links.size(); ++i) {
 257                         find_all_nonlinear_inputs(node->incoming_links[i], nonlinear_inputs);
 258                 }
 259         }
 260 }
 261
 262 Effect *EffectChain::add_effect(Effect *effect, const vector<Effect *> &inputs)
 263 {
 264         assert(!finalized);
 265         assert(inputs.size() == effect->num_inputs());
 266         Node *node = add_node(effect);
 267         for (unsigned i = 0; i < inputs.size(); ++i) {
 268                 assert(node_map.count(inputs[i]) != 0);
 269                 connect_nodes(node_map[inputs[i]], node);
 270         }
 271         return effect;
 272 }
 273
 274 // ESSL doesn't support token pasting. Replace PREFIX(x) with <effect_id>_x.
 275 string replace_prefix(const string &text, const string &prefix)
 276 {
 277         string output;
 278         size_t start = 0;
 279
 280         while (start < text.size()) {
 281                 size_t pos = text.find("PREFIX(", start);
 282                 if (pos == string::npos) {
 283                         output.append(text.substr(start, string::npos));
 284                         break;
 285                 }
 286
 287                 output.append(text.substr(start, pos - start));
 288                 output.append(prefix);
 289                 output.append("_");
 290
 291                 pos += strlen("PREFIX(");
 292
 293                 // Output stuff until we find the matching ), which we then eat.
 294                 int depth = 1;
 295                 size_t end_arg_pos = pos;
 296                 while (end_arg_pos < text.size()) {
 297                         if (text[end_arg_pos] == '(') {
 298                                 ++depth;
 299                         } else if (text[end_arg_pos] == ')') {
 300                                 --depth;
 301                                 if (depth == 0) {
 302                                         break;
 303                                 }
 304                         }
 305                         ++end_arg_pos;
 306                 }
 307                 output.append(text.substr(pos, end_arg_pos - pos));
 308                 ++end_arg_pos;
 309                 assert(depth == 0);
 310                 start = end_arg_pos;
 311         }
 312         return output;
 313 }
 314
 315 namespace {
 316
 317 template<class T>
 318 void extract_uniform_declarations(const vector<Uniform<T>> &effect_uniforms,
 319                                   const string &type_specifier,
 320                                   const string &effect_id,
 321                                   vector<Uniform<T>> *phase_uniforms,
 322                                   string *glsl_string)
 323 {
 324         for (unsigned i = 0; i < effect_uniforms.size(); ++i) {
 325                 phase_uniforms->push_back(effect_uniforms[i]);
 326                 phase_uniforms->back().prefix = effect_id;
 327
 328                 *glsl_string += string("uniform ") + type_specifier + " " + effect_id
 329                         + "_" + effect_uniforms[i].name + ";\n";
 330         }
 331 }
 332
 333 template<class T>
 334 void extract_uniform_array_declarations(const vector<Uniform<T>> &effect_uniforms,
 335                                         const string &type_specifier,
 336                                         const string &effect_id,
 337                                         vector<Uniform<T>> *phase_uniforms,
 338                                         string *glsl_string)
 339 {
 340         for (unsigned i = 0; i < effect_uniforms.size(); ++i) {
 341                 phase_uniforms->push_back(effect_uniforms[i]);
 342                 phase_uniforms->back().prefix = effect_id;
 343
 344                 char buf[256];
 345                 snprintf(buf, sizeof(buf), "uniform %s %s_%s[%d];\n",
 346                         type_specifier.c_str(), effect_id.c_str(),
 347                         effect_uniforms[i].name.c_str(),
 348                         int(effect_uniforms[i].num_values));
 349                 *glsl_string += buf;
 350         }
 351 }
 352
 353 template<class T>
 354 void collect_uniform_locations(GLuint glsl_program_num, vector<Uniform<T>> *phase_uniforms)
 355 {
 356         for (unsigned i = 0; i < phase_uniforms->size(); ++i) {
 357                 Uniform<T> &uniform = (*phase_uniforms)[i];
 358                 uniform.location = get_uniform_location(glsl_program_num, uniform.prefix, uniform.name);
 359         }
 360 }
 361
 362 }  // namespace
 363
 364 void EffectChain::compile_glsl_program(Phase *phase)
 365 {
 366         string frag_shader_header;
 367         if (phase->is_compute_shader) {
 368                 frag_shader_header = read_file("header.comp");
 369         } else {
 370                 frag_shader_header = read_version_dependent_file("header", "frag");
 371         }
 372         string frag_shader = "";
 373
 374         // Create functions and uniforms for all the texture inputs that we need.
 375         for (unsigned i = 0; i < phase->inputs.size(); ++i) {
 376                 Node *input = phase->inputs[i]->output_node;
 377                 char effect_id[256];
 378                 sprintf(effect_id, "in%u", i);
 379                 phase->effect_ids.insert(make_pair(input, effect_id));
 380
 381                 frag_shader += string("uniform sampler2D tex_") + effect_id + ";\n";
 382                 frag_shader += string("vec4 ") + effect_id + "(vec2 tc) {\n";
 383                 frag_shader += "\tvec4 tmp = tex2D(tex_" + string(effect_id) + ", tc);\n";
 384
 385                 if (intermediate_transformation == SQUARE_ROOT_FRAMEBUFFER_TRANSFORMATION &&
 386                     phase->inputs[i]->output_node->output_gamma_curve == GAMMA_LINEAR) {
 387                         frag_shader += "\ttmp.rgb *= tmp.rgb;\n";
 388                 }
 389
 390                 frag_shader += "\treturn tmp;\n";
 391                 frag_shader += "}\n";
 392                 frag_shader += "\n";
 393
 394                 Uniform<int> uniform;
 395                 uniform.name = effect_id;
 396                 uniform.value = &phase->input_samplers[i];
 397                 uniform.prefix = "tex";
 398                 uniform.num_values = 1;
 399                 uniform.location = -1;
 400                 phase->uniforms_sampler2d.push_back(uniform);
 401         }
 402
 403         // Give each effect in the phase its own ID.
 404         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 405                 Node *node = phase->effects[i];
 406                 char effect_id[256];
 407                 sprintf(effect_id, "eff%u", i);
 408                 phase->effect_ids.insert(make_pair(node, effect_id));
 409         }
 410
 411         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 412                 Node *node = phase->effects[i];
 413                 const string effect_id = phase->effect_ids[node];
 414                 if (node->incoming_links.size() == 1) {
 415                         Node *input = node->incoming_links[0];
 416                         if (i != 0 && input->effect->is_compute_shader()) {
 417                                 // First effect after the compute shader reads the value
 418                                 // that cs_output() wrote to a global variable.
 419                                 frag_shader += string("#define INPUT(tc) CS_OUTPUT_VAL\n");
 420                         } else {
 421                                 frag_shader += string("#define INPUT ") + phase->effect_ids[input] + "\n";
 422                         }
 423                 } else {
 424                         for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
 425                                 assert(!node->incoming_links[j]->effect->is_compute_shader());
 426                                 char buf[256];
 427                                 sprintf(buf, "#define INPUT%d %s\n", j + 1, phase->effect_ids[node->incoming_links[j]].c_str());
 428                                 frag_shader += buf;
 429                         }
 430                 }
 431
 432                 frag_shader += "\n";
 433                 frag_shader += string("#define FUNCNAME ") + effect_id + "\n";
 434                 if (node->effect->is_compute_shader()) {
 435                         frag_shader += string("#define NORMALIZE_TEXTURE_COORDS(tc) ((tc) * ") + effect_id + "_inv_output_size + " + effect_id + "_output_texcoord_adjust)\n";
 436                 }
 437                 frag_shader += replace_prefix(node->effect->output_fragment_shader(), effect_id);
 438                 frag_shader += "#undef FUNCNAME\n";
 439                 if (node->incoming_links.size() == 1) {
 440                         frag_shader += "#undef INPUT\n";
 441                 } else {
 442                         for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
 443                                 char buf[256];
 444                                 sprintf(buf, "#undef INPUT%d\n", j + 1);
 445                                 frag_shader += buf;
 446                         }
 447                 }
 448                 frag_shader += "\n";
 449         }
 450         if (phase->is_compute_shader) {
 451                 frag_shader += string("#define INPUT ") + phase->effect_ids[phase->compute_shader_node] + "\n";
 452                 if (phase->compute_shader_node == phase->effects.back()) {
 453                         // No postprocessing.
 454                         frag_shader += "#define CS_POSTPROC(tc) CS_OUTPUT_VAL\n";
 455                 } else {
 456                         frag_shader += string("#define CS_POSTPROC ") + phase->effect_ids[phase->effects.back()] + "\n";
 457                 }
 458         } else {
 459                 frag_shader += string("#define INPUT ") + phase->effect_ids[phase->effects.back()] + "\n";
 460         }
 461
 462         // If we're the last phase, add the right #defines for Y'CbCr multi-output as needed.
 463         vector<string> frag_shader_outputs;  // In order.
 464         if (phase->output_node->outgoing_links.empty() && num_output_color_ycbcr > 0) {
 465                 switch (output_ycbcr_splitting[0]) {
 466                 case YCBCR_OUTPUT_INTERLEAVED:
 467                         // No #defines set.
 468                         frag_shader_outputs.push_back("FragColor");
 469                         break;
 470                 case YCBCR_OUTPUT_SPLIT_Y_AND_CBCR:
 471                         frag_shader += "#define YCBCR_OUTPUT_SPLIT_Y_AND_CBCR 1\n";
 472                         frag_shader_outputs.push_back("Y");
 473                         frag_shader_outputs.push_back("Chroma");
 474                         break;
 475                 case YCBCR_OUTPUT_PLANAR:
 476                         frag_shader += "#define YCBCR_OUTPUT_PLANAR 1\n";
 477                         frag_shader_outputs.push_back("Y");
 478                         frag_shader_outputs.push_back("Cb");
 479                         frag_shader_outputs.push_back("Cr");
 480                         break;
 481                 default:
 482                         assert(false);
 483                 }
 484
 485                 if (num_output_color_ycbcr > 1) {
 486                         switch (output_ycbcr_splitting[1]) {
 487                         case YCBCR_OUTPUT_INTERLEAVED:
 488                                 frag_shader += "#define SECOND_YCBCR_OUTPUT_INTERLEAVED 1\n";
 489                                 frag_shader_outputs.push_back("YCbCr2");
 490                                 break;
 491                         case YCBCR_OUTPUT_SPLIT_Y_AND_CBCR:
 492                                 frag_shader += "#define SECOND_YCBCR_OUTPUT_SPLIT_Y_AND_CBCR 1\n";
 493                                 frag_shader_outputs.push_back("Y2");
 494                                 frag_shader_outputs.push_back("Chroma2");
 495                                 break;
 496                         case YCBCR_OUTPUT_PLANAR:
 497                                 frag_shader += "#define SECOND_YCBCR_OUTPUT_PLANAR 1\n";
 498                                 frag_shader_outputs.push_back("Y2");
 499                                 frag_shader_outputs.push_back("Cb2");
 500                                 frag_shader_outputs.push_back("Cr2");
 501                                 break;
 502                         default:
 503                                 assert(false);
 504                         }
 505                 }
 506
 507                 if (output_color_rgba) {
 508                         // Note: Needs to come in the header, because not only the
 509                         // output needs to see it (YCbCrConversionEffect and DitherEffect
 510                         // do, too).
 511                         frag_shader_header += "#define YCBCR_ALSO_OUTPUT_RGBA 1\n";
 512                         frag_shader_outputs.push_back("RGBA");
 513                 }
 514         }
 515
 516         // If we're bouncing to a temporary texture, signal transformation if desired.
 517         if (!phase->output_node->outgoing_links.empty()) {
 518                 if (intermediate_transformation == SQUARE_ROOT_FRAMEBUFFER_TRANSFORMATION &&
 519                     phase->output_node->output_gamma_curve == GAMMA_LINEAR) {
 520                         frag_shader += "#define SQUARE_ROOT_TRANSFORMATION 1\n";
 521                 }
 522         }
 523
 524         if (phase->is_compute_shader) {
 525                 frag_shader.append(read_file("footer.comp"));
 526                 phase->compute_shader_node->effect->register_uniform_ivec2("output_size", phase->uniform_output_size);
 527                 phase->compute_shader_node->effect->register_uniform_vec2("inv_output_size", (float *)&phase->inv_output_size);
 528                 phase->compute_shader_node->effect->register_uniform_vec2("output_texcoord_adjust", (float *)&phase->output_texcoord_adjust);
 529         } else {
 530                 frag_shader.append(read_file("footer.frag"));
 531         }
 532
 533         // Collect uniforms from all effects and output them. Note that this needs
 534         // to happen after output_fragment_shader(), even though the uniforms come
 535         // before in the output source, since output_fragment_shader() is allowed
 536         // to register new uniforms (e.g. arrays that are of unknown length until
 537         // finalization time).
 538         // TODO: Make a uniform block for platforms that support it.
 539         string frag_shader_uniforms = "";
 540         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 541                 Node *node = phase->effects[i];
 542                 Effect *effect = node->effect;
 543                 const string effect_id = phase->effect_ids[node];
 544                 extract_uniform_declarations(effect->uniforms_image2d, "image2D", effect_id, &phase->uniforms_image2d, &frag_shader_uniforms);
 545                 extract_uniform_declarations(effect->uniforms_sampler2d, "sampler2D", effect_id, &phase->uniforms_sampler2d, &frag_shader_uniforms);
 546                 extract_uniform_declarations(effect->uniforms_bool, "bool", effect_id, &phase->uniforms_bool, &frag_shader_uniforms);
 547                 extract_uniform_declarations(effect->uniforms_int, "int", effect_id, &phase->uniforms_int, &frag_shader_uniforms);
 548                 extract_uniform_declarations(effect->uniforms_ivec2, "ivec2", effect_id, &phase->uniforms_ivec2, &frag_shader_uniforms);
 549                 extract_uniform_declarations(effect->uniforms_float, "float", effect_id, &phase->uniforms_float, &frag_shader_uniforms);
 550                 extract_uniform_declarations(effect->uniforms_vec2, "vec2", effect_id, &phase->uniforms_vec2, &frag_shader_uniforms);
 551                 extract_uniform_declarations(effect->uniforms_vec3, "vec3", effect_id, &phase->uniforms_vec3, &frag_shader_uniforms);
 552                 extract_uniform_declarations(effect->uniforms_vec4, "vec4", effect_id, &phase->uniforms_vec4, &frag_shader_uniforms);
 553                 extract_uniform_array_declarations(effect->uniforms_float_array, "float", effect_id, &phase->uniforms_float, &frag_shader_uniforms);
 554                 extract_uniform_array_declarations(effect->uniforms_vec2_array, "vec2", effect_id, &phase->uniforms_vec2, &frag_shader_uniforms);
 555                 extract_uniform_array_declarations(effect->uniforms_vec3_array, "vec3", effect_id, &phase->uniforms_vec3, &frag_shader_uniforms);
 556                 extract_uniform_array_declarations(effect->uniforms_vec4_array, "vec4", effect_id, &phase->uniforms_vec4, &frag_shader_uniforms);
 557                 extract_uniform_declarations(effect->uniforms_mat3, "mat3", effect_id, &phase->uniforms_mat3, &frag_shader_uniforms);
 558         }
 559
 560         string vert_shader = read_version_dependent_file("vs", "vert");
 561
 562         // If we're the last phase and need to flip the picture to compensate for
 563         // the origin, tell the vertex or compute shader so.
 564         bool is_last_phase;
 565         if (has_dummy_effect) {
 566                 is_last_phase = (phase->output_node->outgoing_links.size() == 1 &&
 567                         phase->output_node->outgoing_links[0]->effect->effect_type_id() == "ComputeShaderOutputDisplayEffect");
 568         } else {
 569                 is_last_phase = phase->output_node->outgoing_links.empty();
 570         }
 571         if (is_last_phase && output_origin == OUTPUT_ORIGIN_TOP_LEFT) {
 572                 if (phase->is_compute_shader) {
 573                         frag_shader_header += "#define FLIP_ORIGIN 1\n";
 574                 } else {
 575                         const string needle = "#define FLIP_ORIGIN 0";
 576                         size_t pos = vert_shader.find(needle);
 577                         assert(pos != string::npos);
 578
 579                         vert_shader[pos + needle.size() - 1] = '1';
 580                 }
 581         }
 582
 583         frag_shader = frag_shader_header + frag_shader_uniforms + frag_shader;
 584
 585         if (phase->is_compute_shader) {
 586                 phase->glsl_program_num = resource_pool->compile_glsl_compute_program(frag_shader);
 587
 588                 Uniform<int> uniform;
 589                 uniform.name = "outbuf";
 590                 uniform.value = &phase->outbuf_image_unit;
 591                 uniform.prefix = "tex";
 592                 uniform.num_values = 1;
 593                 uniform.location = -1;
 594                 phase->uniforms_image2d.push_back(uniform);
 595         } else {
 596                 phase->glsl_program_num = resource_pool->compile_glsl_program(vert_shader, frag_shader, frag_shader_outputs);
 597         }
 598         GLint position_attribute_index = glGetAttribLocation(phase->glsl_program_num, "position");
 599         GLint texcoord_attribute_index = glGetAttribLocation(phase->glsl_program_num, "texcoord");
 600         if (position_attribute_index != -1) {
 601                 phase->attribute_indexes.insert(position_attribute_index);
 602         }
 603         if (texcoord_attribute_index != -1) {
 604                 phase->attribute_indexes.insert(texcoord_attribute_index);
 605         }
 606
 607         // Collect the resulting location numbers for each uniform.
 608         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_image2d);
 609         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_sampler2d);
 610         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_bool);
 611         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_int);
 612         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_ivec2);
 613         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_float);
 614         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_vec2);
 615         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_vec3);
 616         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_vec4);
 617         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_mat3);
 618 }
 619
 620 // Construct GLSL programs, starting at the given effect and following
 621 // the chain from there. We end a program every time we come to an effect
 622 // marked as "needs texture bounce", one that is used by multiple other
 623 // effects, every time we need to bounce due to output size change
 624 // (not all size changes require ending), and of course at the end.
 625 //
 626 // We follow a quite simple depth-first search from the output, although
 627 // without recursing explicitly within each phase.
 628 Phase *EffectChain::construct_phase(Node *output, map<Node *, Phase *> *completed_effects)
 629 {
 630         if (completed_effects->count(output)) {
 631                 return (*completed_effects)[output];
 632         }
 633
 634         Phase *phase = new Phase;
 635         phase->output_node = output;
 636         phase->is_compute_shader = false;
 637         phase->compute_shader_node = nullptr;
 638
 639         // If the output effect has one-to-one sampling, we try to trace this
 640         // status down through the dependency chain. This is important in case
 641         // we hit an effect that changes output size (and not sets a virtual
 642         // output size); if we have one-to-one sampling, we don't have to break
 643         // the phase.
 644         output->one_to_one_sampling = output->effect->one_to_one_sampling();
 645         output->strong_one_to_one_sampling = output->effect->strong_one_to_one_sampling();
 646
 647         // Effects that we have yet to calculate, but that we know should
 648         // be in the current phase.
 649         stack<Node *> effects_todo_this_phase;
 650         effects_todo_this_phase.push(output);
 651
 652         while (!effects_todo_this_phase.empty()) {
 653                 Node *node = effects_todo_this_phase.top();
 654                 effects_todo_this_phase.pop();
 655
 656                 assert(node->effect->one_to_one_sampling() >= node->effect->strong_one_to_one_sampling());
 657
 658                 if (node->effect->needs_mipmaps() != Effect::DOES_NOT_NEED_MIPMAPS) {
 659                         // Can't have incompatible requirements imposed on us from a dependent effect;
 660                         // if so, it should have started a new phase instead.
 661                         assert(node->needs_mipmaps == Effect::DOES_NOT_NEED_MIPMAPS ||
 662                                node->needs_mipmaps == node->effect->needs_mipmaps());
 663                         node->needs_mipmaps = node->effect->needs_mipmaps();
 664                 }
 665
 666                 // This should currently only happen for effects that are inputs
 667                 // (either true inputs or phase outputs). We special-case inputs,
 668                 // and then deduplicate phase outputs below.
 669                 if (node->effect->num_inputs() == 0) {
 670                         if (find(phase->effects.begin(), phase->effects.end(), node) != phase->effects.end()) {
 671                                 continue;
 672                         }
 673                 } else {
 674                         assert(completed_effects->count(node) == 0);
 675                 }
 676
 677                 phase->effects.push_back(node);
 678                 if (node->effect->is_compute_shader()) {
 679                         phase->is_compute_shader = true;
 680                         phase->compute_shader_node = node;
 681                 }
 682
 683                 // Find all the dependencies of this effect, and add them to the stack.
 684                 vector<Node *> deps = node->incoming_links;
 685                 assert(node->effect->num_inputs() == deps.size());
 686                 for (unsigned i = 0; i < deps.size(); ++i) {
 687                         bool start_new_phase = false;
 688
 689                         if (node->effect->needs_texture_bounce() &&
 690                             !deps[i]->effect->is_single_texture() &&
 691                             !deps[i]->effect->override_disable_bounce()) {
 692                                 start_new_phase = true;
 693                         }
 694
 695                         // Propagate information about needing mipmaps down the chain,
 696                         // breaking the phase if we notice an incompatibility.
 697                         //
 698                         // Note that we cannot do this propagation as a normal pass,
 699                         // because it needs information about where the phases end
 700                         // (we should not propagate the flag across phases).
 701                         if (node->needs_mipmaps != Effect::DOES_NOT_NEED_MIPMAPS) {
 702                                 if (deps[i]->effect->num_inputs() == 0 && node->needs_mipmaps == Effect::NEEDS_MIPMAPS) {
 703                                         Input *input = static_cast<Input *>(deps[i]->effect);
 704                                         start_new_phase |= !input->can_supply_mipmaps();
 705                                 } else if (deps[i]->effect->needs_mipmaps() == Effect::DOES_NOT_NEED_MIPMAPS) {
 706                                         deps[i]->needs_mipmaps = node->needs_mipmaps;
 707                                 } else if (deps[i]->effect->needs_mipmaps() != node->needs_mipmaps) {
 708                                         start_new_phase = true;
 709                                 }
 710                         }
 711
 712                         if (deps[i]->outgoing_links.size() > 1) {
 713                                 if (!deps[i]->effect->is_single_texture()) {
 714                                         // More than one effect uses this as the input,
 715                                         // and it is not a texture itself.
 716                                         // The easiest thing to do (and probably also the safest
 717                                         // performance-wise in most cases) is to bounce it to a texture
 718                                         // and then let the next passes read from that.
 719                                         start_new_phase = true;
 720                                 } else {
 721                                         assert(deps[i]->effect->num_inputs() == 0);
 722
 723                                         // For textures, we try to be slightly more clever;
 724                                         // if none of our outputs need a bounce, we don't bounce
 725                                         // but instead simply use the effect many times.
 726                                         //
 727                                         // Strictly speaking, we could bounce it for some outputs
 728                                         // and use it directly for others, but the processing becomes
 729                                         // somewhat simpler if the effect is only used in one such way.
 730                                         for (unsigned j = 0; j < deps[i]->outgoing_links.size(); ++j) {
 731                                                 Node *rdep = deps[i]->outgoing_links[j];
 732                                                 start_new_phase |= rdep->effect->needs_texture_bounce();
 733                                         }
 734                                 }
 735                         }
 736
 737                         if (deps[i]->effect->is_compute_shader()) {
 738                                 // Only one compute shader per phase; we should have been stopped
 739                                 // already due to the fact that compute shaders are not one-to-one.
 740                                 assert(!phase->is_compute_shader);
 741
 742                                 // If all nodes so far are strong one-to-one, we can put them after
 743                                 // the compute shader (ie., process them on the output).
 744                                 start_new_phase = !node->strong_one_to_one_sampling;
 745                         } else if (deps[i]->effect->sets_virtual_output_size()) {
 746                                 assert(deps[i]->effect->changes_output_size());
 747                                 // If the next effect sets a virtual size to rely on OpenGL's
 748                                 // bilinear sampling, we'll really need to break the phase here.
 749                                 start_new_phase = true;
 750                         } else if (deps[i]->effect->changes_output_size() && !node->one_to_one_sampling) {
 751                                 // If the next effect changes size and we don't have one-to-one sampling,
 752                                 // we also need to break here.
 753                                 start_new_phase = true;
 754                         }
 755
 756                         if (start_new_phase) {
 757                                 phase->inputs.push_back(construct_phase(deps[i], completed_effects));
 758                         } else {
 759                                 effects_todo_this_phase.push(deps[i]);
 760
 761                                 // Propagate the one-to-one status down through the dependency.
 762                                 deps[i]->one_to_one_sampling = node->one_to_one_sampling &&
 763                                         deps[i]->effect->one_to_one_sampling();
 764                                 deps[i]->strong_one_to_one_sampling = node->strong_one_to_one_sampling &&
 765                                         deps[i]->effect->strong_one_to_one_sampling();
 766                         }
 767                 }
 768         }
 769
 770         // No more effects to do this phase. Take all the ones we have,
 771         // and create a GLSL program for it.
 772         assert(!phase->effects.empty());
 773
 774         // Deduplicate the inputs, but don't change the ordering e.g. by sorting;
 775         // that would be nondeterministic and thus reduce cacheability.
 776         // TODO: Make this even more deterministic.
 777         vector<Phase *> dedup_inputs;
 778         set<Phase *> seen_inputs;
 779         for (size_t i = 0; i < phase->inputs.size(); ++i) {
 780                 if (seen_inputs.insert(phase->inputs[i]).second) {
 781                         dedup_inputs.push_back(phase->inputs[i]);
 782                 }
 783         }
 784         swap(phase->inputs, dedup_inputs);
 785
 786         // Allocate samplers for each input.
 787         phase->input_samplers.resize(phase->inputs.size());
 788
 789         // We added the effects from the output and back, but we need to output
 790         // them in topological sort order in the shader.
 791         phase->effects = topological_sort(phase->effects);
 792
 793         // Figure out if we need mipmaps or not, and if so, tell the inputs that.
 794         phase->input_needs_mipmaps = false;
 795         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 796                 Node *node = phase->effects[i];
 797                 if (node->effect->needs_mipmaps() == Effect::NEEDS_MIPMAPS) {
 798                         phase->input_needs_mipmaps = true;
 799                 }
 800         }
 801         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 802                 Node *node = phase->effects[i];
 803                 if (node->effect->num_inputs() == 0) {
 804                         Input *input = static_cast<Input *>(node->effect);
 805                         assert(!phase->input_needs_mipmaps || input->can_supply_mipmaps());
 806                         CHECK(input->set_int("needs_mipmaps", phase->input_needs_mipmaps));
 807                 }
 808         }
 809
 810         // Tell each node which phase it ended up in, so that the unit test
 811         // can check that the phases were split in the right place.
 812         // Note that this ignores that effects may be part of multiple phases;
 813         // if the unit tests need to test such cases, we'll reconsider.
 814         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 815                 phase->effects[i]->containing_phase = phase;
 816         }
 817
 818         // Actually make the shader for this phase.
 819         compile_glsl_program(phase);
 820
 821         // Initialize timers.
 822         if (movit_timer_queries_supported) {
 823                 phase->time_elapsed_ns = 0;
 824                 phase->num_measured_iterations = 0;
 825         }
 826
 827         assert(completed_effects->count(output) == 0);
 828         completed_effects->insert(make_pair(output, phase));
 829         phases.push_back(phase);
 830         return phase;
 831 }
 832
 833 void EffectChain::output_dot(const char *filename)
 834 {
 835         if (movit_debug_level != MOVIT_DEBUG_ON) {
 836                 return;
 837         }
 838
 839         FILE *fp = fopen(filename, "w");
 840         if (fp == nullptr) {
 841                 perror(filename);
 842                 exit(1);
 843         }
 844
 845         fprintf(fp, "digraph G {\n");
 846         fprintf(fp, "  output [shape=box label=\"(output)\"];\n");
 847         for (unsigned i = 0; i < nodes.size(); ++i) {
 848                 // Find out which phase this event belongs to.
 849                 vector<int> in_phases;
 850                 for (unsigned j = 0; j < phases.size(); ++j) {
 851                         const Phase* p = phases[j];
 852                         if (find(p->effects.begin(), p->effects.end(), nodes[i]) != p->effects.end()) {
 853                                 in_phases.push_back(j);
 854                         }
 855                 }
 856
 857                 if (in_phases.empty()) {
 858                         fprintf(fp, "  n%ld [label=\"%s\"];\n", (long)nodes[i], nodes[i]->effect->effect_type_id().c_str());
 859                 } else if (in_phases.size() == 1) {
 860                         fprintf(fp, "  n%ld [label=\"%s\" style=\"filled\" fillcolor=\"/accent8/%d\"];\n",
 861                                 (long)nodes[i], nodes[i]->effect->effect_type_id().c_str(),
 862                                 (in_phases[0] % 8) + 1);
 863                 } else {
 864                         // If we had new enough Graphviz, style="wedged" would probably be ideal here.
 865                         // But alas.
 866                         fprintf(fp, "  n%ld [label=\"%s [in multiple phases]\" style=\"filled\" fillcolor=\"/accent8/%d\"];\n",
 867                                 (long)nodes[i], nodes[i]->effect->effect_type_id().c_str(),
 868                                 (in_phases[0] % 8) + 1);
 869                 }
 870
 871                 char from_node_id[256];
 872                 snprintf(from_node_id, 256, "n%ld", (long)nodes[i]);
 873
 874                 for (unsigned j = 0; j < nodes[i]->outgoing_links.size(); ++j) {
 875                         char to_node_id[256];
 876                         snprintf(to_node_id, 256, "n%ld", (long)nodes[i]->outgoing_links[j]);
 877
 878                         vector<string> labels = get_labels_for_edge(nodes[i], nodes[i]->outgoing_links[j]);
 879                         output_dot_edge(fp, from_node_id, to_node_id, labels);
 880                 }
 881
 882                 if (nodes[i]->outgoing_links.empty() && !nodes[i]->disabled) {
 883                         // Output node.
 884                         vector<string> labels = get_labels_for_edge(nodes[i], nullptr);
 885                         output_dot_edge(fp, from_node_id, "output", labels);
 886                 }
 887         }
 888         fprintf(fp, "}\n");
 889
 890         fclose(fp);
 891 }
 892
 893 vector<string> EffectChain::get_labels_for_edge(const Node *from, const Node *to)
 894 {
 895         vector<string> labels;
 896
 897         if (to != nullptr && to->effect->needs_texture_bounce()) {
 898                 labels.push_back("needs_bounce");
 899         }
 900         if (from->effect->changes_output_size()) {
 901                 labels.push_back("resize");
 902         }
 903
 904         switch (from->output_color_space) {
 905         case COLORSPACE_INVALID:
 906                 labels.push_back("spc[invalid]");
 907                 break;
 908         case COLORSPACE_REC_601_525:
 909                 labels.push_back("spc[rec601-525]");
 910                 break;
 911         case COLORSPACE_REC_601_625:
 912                 labels.push_back("spc[rec601-625]");
 913                 break;
 914         default:
 915                 break;
 916         }
 917
 918         switch (from->output_gamma_curve) {
 919         case GAMMA_INVALID:
 920                 labels.push_back("gamma[invalid]");
 921                 break;
 922         case GAMMA_sRGB:
 923                 labels.push_back("gamma[sRGB]");
 924                 break;
 925         case GAMMA_REC_601:  // and GAMMA_REC_709
 926                 labels.push_back("gamma[rec601/709]");
 927                 break;
 928         default:
 929                 break;
 930         }
 931
 932         switch (from->output_alpha_type) {
 933         case ALPHA_INVALID:
 934                 labels.push_back("alpha[invalid]");
 935                 break;
 936         case ALPHA_BLANK:
 937                 labels.push_back("alpha[blank]");
 938                 break;
 939         case ALPHA_POSTMULTIPLIED:
 940                 labels.push_back("alpha[postmult]");
 941                 break;
 942         default:
 943                 break;
 944         }
 945
 946         return labels;
 947 }
 948
 949 void EffectChain::output_dot_edge(FILE *fp,
 950                                   const string &from_node_id,
 951                                   const string &to_node_id,
 952                                   const vector<string> &labels)
 953 {
 954         if (labels.empty()) {
 955                 fprintf(fp, "  %s -> %s;\n", from_node_id.c_str(), to_node_id.c_str());
 956         } else {
 957                 string label = labels[0];
 958                 for (unsigned k = 1; k < labels.size(); ++k) {
 959                         label += ", " + labels[k];
 960                 }
 961                 fprintf(fp, "  %s -> %s [label=\"%s\"];\n", from_node_id.c_str(), to_node_id.c_str(), label.c_str());
 962         }
 963 }
 964
 965 void EffectChain::size_rectangle_to_fit(unsigned width, unsigned height, unsigned *output_width, unsigned *output_height)
 966 {
 967         unsigned scaled_width, scaled_height;
 968
 969         if (float(width) * aspect_denom >= float(height) * aspect_nom) {
 970                 // Same aspect, or W/H > aspect (image is wider than the frame).
 971                 // In either case, keep width, and adjust height.
 972                 scaled_width = width;
 973                 scaled_height = lrintf(width * aspect_denom / aspect_nom);
 974         } else {
 975                 // W/H < aspect (image is taller than the frame), so keep height,
 976                 // and adjust width.
 977                 scaled_width = lrintf(height * aspect_nom / aspect_denom);
 978                 scaled_height = height;
 979         }
 980
 981         // We should be consistently larger or smaller then the existing choice,
 982         // since we have the same aspect.
 983         assert(!(scaled_width < *output_width && scaled_height > *output_height));
 984         assert(!(scaled_height < *output_height && scaled_width > *output_width));
 985
 986         if (scaled_width >= *output_width && scaled_height >= *output_height) {
 987                 *output_width = scaled_width;
 988                 *output_height = scaled_height;
 989         }
 990 }
 991
 992 // Propagate input texture sizes throughout, and inform effects downstream.
 993 // (Like a lot of other code, we depend on effects being in topological order.)
 994 void EffectChain::inform_input_sizes(Phase *phase)
 995 {
 996         // All effects that have a defined size (inputs and RTT inputs)
 997         // get that. Reset all others.
 998         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 999                 Node *node = phase->effects[i];
1000                 if (node->effect->num_inputs() == 0) {
1001                         Input *input = static_cast<Input *>(node->effect);
1002                         node->output_width = input->get_width();
1003                         node->output_height = input->get_height();
1004                         assert(node->output_width != 0);
1005                         assert(node->output_height != 0);
1006                 } else {
1007                         node->output_width = node->output_height = 0;
1008                 }
1009         }
1010         for (unsigned i = 0; i < phase->inputs.size(); ++i) {
1011                 Phase *input = phase->inputs[i];
1012                 input->output_node->output_width = input->virtual_output_width;
1013                 input->output_node->output_height = input->virtual_output_height;
1014                 assert(input->output_node->output_width != 0);
1015                 assert(input->output_node->output_height != 0);
1016         }
1017
1018         // Now propagate from the inputs towards the end, and inform as we go.
1019         // The rules are simple:
1020         //
1021         //   1. Don't touch effects that already have given sizes (ie., inputs
1022         //      or effects that change the output size).
1023         //   2. If all of your inputs have the same size, that will be your output size.
1024         //   3. Otherwise, your output size is 0x0.
1025         for (unsigned i = 0; i < phase->effects.size(); ++i) {
1026                 Node *node = phase->effects[i];
1027                 if (node->effect->num_inputs() == 0) {
1028                         continue;
1029                 }
1030                 unsigned this_output_width = 0;
1031                 unsigned this_output_height = 0;
1032                 for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
1033                         Node *input = node->incoming_links[j];
1034                         node->effect->inform_input_size(j, input->output_width, input->output_height);
1035                         if (j == 0) {
1036                                 this_output_width = input->output_width;
1037                                 this_output_height = input->output_height;
1038                         } else if (input->output_width != this_output_width || input->output_height != this_output_height) {
1039                                 // Inputs disagree.
1040                                 this_output_width = 0;
1041                                 this_output_height = 0;
1042                         }
1043                 }
1044                 if (node->effect->changes_output_size()) {
1045                         // We cannot call get_output_size() before we've done inform_input_size()
1046                         // on all inputs.
1047                         unsigned real_width, real_height;
1048                         node->effect->get_output_size(&real_width, &real_height,
1049                                                       &node->output_width, &node->output_height);
1050                         assert(node->effect->sets_virtual_output_size() ||
1051                                (real_width == node->output_width &&
1052                                 real_height == node->output_height));
1053                 } else {
1054                         node->output_width = this_output_width;
1055                         node->output_height = this_output_height;
1056                 }
1057         }
1058 }
1059
1060 // Note: You should call inform_input_sizes() before this, as the last effect's
1061 // desired output size might change based on the inputs.
1062 void EffectChain::find_output_size(Phase *phase)
1063 {
1064         Node *output_node = phase->is_compute_shader ? phase->compute_shader_node : phase->effects.back();
1065
1066         // If the last effect explicitly sets an output size, use that.
1067         if (output_node->effect->changes_output_size()) {
1068                 output_node->effect->get_output_size(&phase->output_width, &phase->output_height,
1069                                                      &phase->virtual_output_width, &phase->virtual_output_height);
1070                 assert(output_node->effect->sets_virtual_output_size() ||
1071                        (phase->output_width == phase->virtual_output_width &&
1072                         phase->output_height == phase->virtual_output_height));
1073                 return;
1074         }
1075
1076         // If all effects have the same size, use that.
1077         unsigned output_width = 0, output_height = 0;
1078         bool all_inputs_same_size = true;
1079
1080         for (unsigned i = 0; i < phase->inputs.size(); ++i) {
1081                 Phase *input = phase->inputs[i];
1082                 assert(input->output_width != 0);
1083                 assert(input->output_height != 0);
1084                 if (output_width == 0 && output_height == 0) {
1085                         output_width = input->virtual_output_width;
1086                         output_height = input->virtual_output_height;
1087                 } else if (output_width != input->virtual_output_width ||
1088                            output_height != input->virtual_output_height) {
1089                         all_inputs_same_size = false;
1090                 }
1091         }
1092         for (unsigned i = 0; i < phase->effects.size(); ++i) {
1093                 Effect *effect = phase->effects[i]->effect;
1094                 if (effect->num_inputs() != 0) {
1095                         continue;
1096                 }
1097
1098                 Input *input = static_cast<Input *>(effect);
1099                 if (output_width == 0 && output_height == 0) {
1100                         output_width = input->get_width();
1101                         output_height = input->get_height();
1102                 } else if (output_width != input->get_width() ||
1103                            output_height != input->get_height()) {
1104                         all_inputs_same_size = false;
1105                 }
1106         }
1107
1108         if (all_inputs_same_size) {
1109                 assert(output_width != 0);
1110                 assert(output_height != 0);
1111                 phase->virtual_output_width = phase->output_width = output_width;
1112                 phase->virtual_output_height = phase->output_height = output_height;
1113                 return;
1114         }
1115
1116         // If not, fit all the inputs into the current aspect, and select the largest one.
1117         output_width = 0;
1118         output_height = 0;
1119         for (unsigned i = 0; i < phase->inputs.size(); ++i) {
1120                 Phase *input = phase->inputs[i];
1121                 assert(input->output_width != 0);
1122                 assert(input->output_height != 0);
1123                 size_rectangle_to_fit(input->output_width, input->output_height, &output_width, &output_height);
1124         }
1125         for (unsigned i = 0; i < phase->effects.size(); ++i) {
1126                 Effect *effect = phase->effects[i]->effect;
1127                 if (effect->num_inputs() != 0) {
1128                         continue;
1129                 }
1130
1131                 Input *input = static_cast<Input *>(effect);
1132                 size_rectangle_to_fit(input->get_width(), input->get_height(), &output_width, &output_height);
1133         }
1134         assert(output_width != 0);
1135         assert(output_height != 0);
1136         phase->virtual_output_width = phase->output_width = output_width;
1137         phase->virtual_output_height = phase->output_height = output_height;
1138 }
1139
1140 void EffectChain::sort_all_nodes_topologically()
1141 {
1142         nodes = topological_sort(nodes);
1143 }
1144
1145 vector<Node *> EffectChain::topological_sort(const vector<Node *> &nodes)
1146 {
1147         set<Node *> nodes_left_to_visit(nodes.begin(), nodes.end());
1148         vector<Node *> sorted_list;
1149         for (unsigned i = 0; i < nodes.size(); ++i) {
1150                 topological_sort_visit_node(nodes[i], &nodes_left_to_visit, &sorted_list);
1151         }
1152         reverse(sorted_list.begin(), sorted_list.end());
1153         return sorted_list;
1154 }
1155
1156 void EffectChain::topological_sort_visit_node(Node *node, set<Node *> *nodes_left_to_visit, vector<Node *> *sorted_list)
1157 {
1158         if (nodes_left_to_visit->count(node) == 0) {
1159                 return;
1160         }
1161         nodes_left_to_visit->erase(node);
1162         for (unsigned i = 0; i < node->outgoing_links.size(); ++i) {
1163                 topological_sort_visit_node(node->outgoing_links[i], nodes_left_to_visit, sorted_list);
1164         }
1165         sorted_list->push_back(node);
1166 }
1167
1168 void EffectChain::find_color_spaces_for_inputs()
1169 {
1170         for (unsigned i = 0; i < nodes.size(); ++i) {
1171                 Node *node = nodes[i];
1172                 if (node->disabled) {
1173                         continue;
1174                 }
1175                 if (node->incoming_links.size() == 0) {
1176                         Input *input = static_cast<Input *>(node->effect);
1177                         node->output_color_space = input->get_color_space();
1178                         node->output_gamma_curve = input->get_gamma_curve();
1179
1180                         Effect::AlphaHandling alpha_handling = input->alpha_handling();
1181                         switch (alpha_handling) {
1182                         case Effect::OUTPUT_BLANK_ALPHA:
1183                                 node->output_alpha_type = ALPHA_BLANK;
1184                                 break;
1185                         case Effect::INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA:
1186                                 node->output_alpha_type = ALPHA_PREMULTIPLIED;
1187                                 break;
1188                         case Effect::OUTPUT_POSTMULTIPLIED_ALPHA:
1189                                 node->output_alpha_type = ALPHA_POSTMULTIPLIED;
1190                                 break;
1191                         case Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK:
1192                         case Effect::DONT_CARE_ALPHA_TYPE:
1193                         default:
1194                                 assert(false);
1195                         }
1196
1197                         if (node->output_alpha_type == ALPHA_PREMULTIPLIED) {
1198                                 assert(node->output_gamma_curve == GAMMA_LINEAR);
1199                         }
1200                 }
1201         }
1202 }
1203
1204 // Propagate gamma and color space information as far as we can in the graph.
1205 // The rules are simple: Anything where all the inputs agree, get that as
1206 // output as well. Anything else keeps having *_INVALID.
1207 void EffectChain::propagate_gamma_and_color_space()
1208 {
1209         // We depend on going through the nodes in order.
1210         sort_all_nodes_topologically();
1211
1212         for (unsigned i = 0; i < nodes.size(); ++i) {
1213                 Node *node = nodes[i];
1214                 if (node->disabled) {
1215                         continue;
1216                 }
1217                 assert(node->incoming_links.size() == node->effect->num_inputs());
1218                 if (node->incoming_links.size() == 0) {
1219                         assert(node->output_color_space != COLORSPACE_INVALID);
1220                         assert(node->output_gamma_curve != GAMMA_INVALID);
1221                         continue;
1222                 }
1223
1224                 Colorspace color_space = node->incoming_links[0]->output_color_space;
1225                 GammaCurve gamma_curve = node->incoming_links[0]->output_gamma_curve;
1226                 for (unsigned j = 1; j < node->incoming_links.size(); ++j) {
1227                         if (node->incoming_links[j]->output_color_space != color_space) {
1228                                 color_space = COLORSPACE_INVALID;
1229                         }
1230                         if (node->incoming_links[j]->output_gamma_curve != gamma_curve) {
1231                                 gamma_curve = GAMMA_INVALID;
1232                         }
1233                 }
1234
1235                 // The conversion effects already have their outputs set correctly,
1236                 // so leave them alone.
1237                 if (node->effect->effect_type_id() != "ColorspaceConversionEffect") {
1238                         node->output_color_space = color_space;
1239                 }
1240                 if (node->effect->effect_type_id() != "GammaCompressionEffect" &&
1241                     node->effect->effect_type_id() != "GammaExpansionEffect") {
1242                         node->output_gamma_curve = gamma_curve;
1243                 }
1244         }
1245 }
1246
1247 // Propagate alpha information as far as we can in the graph.
1248 // Similar to propagate_gamma_and_color_space().
1249 void EffectChain::propagate_alpha()
1250 {
1251         // We depend on going through the nodes in order.
1252         sort_all_nodes_topologically();
1253
1254         for (unsigned i = 0; i < nodes.size(); ++i) {
1255                 Node *node = nodes[i];
1256                 if (node->disabled) {
1257                         continue;
1258                 }
1259                 assert(node->incoming_links.size() == node->effect->num_inputs());
1260                 if (node->incoming_links.size() == 0) {
1261                         assert(node->output_alpha_type != ALPHA_INVALID);
1262                         continue;
1263                 }
1264
1265                 // The alpha multiplication/division effects are special cases.
1266                 if (node->effect->effect_type_id() == "AlphaMultiplicationEffect") {
1267                         assert(node->incoming_links.size() == 1);
1268                         assert(node->incoming_links[0]->output_alpha_type == ALPHA_POSTMULTIPLIED);
1269                         node->output_alpha_type = ALPHA_PREMULTIPLIED;
1270                         continue;
1271                 }
1272                 if (node->effect->effect_type_id() == "AlphaDivisionEffect") {
1273                         assert(node->incoming_links.size() == 1);
1274                         assert(node->incoming_links[0]->output_alpha_type == ALPHA_PREMULTIPLIED);
1275                         node->output_alpha_type = ALPHA_POSTMULTIPLIED;
1276                         continue;
1277                 }
1278
1279                 // GammaCompressionEffect and GammaExpansionEffect are also a special case,
1280                 // because they are the only one that _need_ postmultiplied alpha.
1281                 if (node->effect->effect_type_id() == "GammaCompressionEffect" ||
1282                     node->effect->effect_type_id() == "GammaExpansionEffect") {
1283                         assert(node->incoming_links.size() == 1);
1284                         if (node->incoming_links[0]->output_alpha_type == ALPHA_BLANK) {
1285                                 node->output_alpha_type = ALPHA_BLANK;
1286                         } else if (node->incoming_links[0]->output_alpha_type == ALPHA_POSTMULTIPLIED) {
1287                                 node->output_alpha_type = ALPHA_POSTMULTIPLIED;
1288                         } else {
1289                                 node->output_alpha_type = ALPHA_INVALID;
1290                         }
1291                         continue;
1292                 }
1293
1294                 // Only inputs can have unconditional alpha output (OUTPUT_BLANK_ALPHA
1295                 // or OUTPUT_POSTMULTIPLIED_ALPHA), and they have already been
1296                 // taken care of above. Rationale: Even if you could imagine
1297                 // e.g. an effect that took in an image and set alpha=1.0
1298                 // unconditionally, it wouldn't make any sense to have it as
1299                 // e.g. OUTPUT_BLANK_ALPHA, since it wouldn't know whether it
1300                 // got its input pre- or postmultiplied, so it wouldn't know
1301                 // whether to divide away the old alpha or not.
1302                 Effect::AlphaHandling alpha_handling = node->effect->alpha_handling();
1303                 assert(alpha_handling == Effect::INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA ||
1304                        alpha_handling == Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK ||
1305                        alpha_handling == Effect::DONT_CARE_ALPHA_TYPE);
1306
1307                 // If the node has multiple inputs, check that they are all valid and
1308                 // the same.
1309                 bool any_invalid = false;
1310                 bool any_premultiplied = false;
1311                 bool any_postmultiplied = false;
1312
1313                 for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
1314                         switch (node->incoming_links[j]->output_alpha_type) {
1315                         case ALPHA_INVALID:
1316                                 any_invalid = true;
1317                                 break;
1318                         case ALPHA_BLANK:
1319                                 // Blank is good as both pre- and postmultiplied alpha,
1320                                 // so just ignore it.
1321                                 break;
1322                         case ALPHA_PREMULTIPLIED:
1323                                 any_premultiplied = true;
1324                                 break;
1325                         case ALPHA_POSTMULTIPLIED:
1326                                 any_postmultiplied = true;
1327                                 break;
1328                         default:
1329                                 assert(false);
1330                         }
1331                 }
1332
1333                 if (any_invalid) {
1334                         node->output_alpha_type = ALPHA_INVALID;
1335                         continue;
1336                 }
1337
1338                 // Inputs must be of the same type.
1339                 if (any_premultiplied && any_postmultiplied) {
1340                         node->output_alpha_type = ALPHA_INVALID;
1341                         continue;
1342                 }
1343
1344                 if (alpha_handling == Effect::INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA ||
1345                     alpha_handling == Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK) {
1346                         // This combination (requiring premultiplied alpha, but _not_ requiring
1347                         // linear light) is illegal, since the combination of premultiplied alpha
1348                         // and nonlinear inputs is meaningless.
1349                         assert(node->effect->needs_linear_light());
1350
1351                         // If the effect has asked for premultiplied alpha, check that it has got it.
1352                         if (any_postmultiplied) {
1353                                 node->output_alpha_type = ALPHA_INVALID;
1354                         } else if (!any_premultiplied &&
1355                                    alpha_handling == Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK) {
1356                                 // Blank input alpha, and the effect preserves blank alpha.
1357                                 node->output_alpha_type = ALPHA_BLANK;
1358                         } else {
1359                                 node->output_alpha_type = ALPHA_PREMULTIPLIED;
1360                         }
1361                 } else {
1362                         // OK, all inputs are the same, and this effect is not going
1363                         // to change it.
1364                         assert(alpha_handling == Effect::DONT_CARE_ALPHA_TYPE);
1365                         if (any_premultiplied) {
1366                                 node->output_alpha_type = ALPHA_PREMULTIPLIED;
1367                         } else if (any_postmultiplied) {
1368                                 node->output_alpha_type = ALPHA_POSTMULTIPLIED;
1369                         } else {
1370                                 node->output_alpha_type = ALPHA_BLANK;
1371                         }
1372                 }
1373         }
1374 }
1375
1376 bool EffectChain::node_needs_colorspace_fix(Node *node)
1377 {
1378         if (node->disabled) {
1379                 return false;
1380         }
1381         if (node->effect->num_inputs() == 0) {
1382                 return false;
1383         }
1384
1385         // propagate_gamma_and_color_space() has already set our output
1386         // to COLORSPACE_INVALID if the inputs differ, so we can rely on that.
1387         if (node->output_color_space == COLORSPACE_INVALID) {
1388                 return true;
1389         }
1390         return (node->effect->needs_srgb_primaries() && node->output_color_space != COLORSPACE_sRGB);
1391 }
1392
1393 // Fix up color spaces so that there are no COLORSPACE_INVALID nodes left in
1394 // the graph. Our strategy is not always optimal, but quite simple:
1395 // Find an effect that's as early as possible where the inputs are of
1396 // unacceptable colorspaces (that is, either different, or, if the effect only
1397 // wants sRGB, not sRGB.) Add appropriate conversions on all its inputs,
1398 // propagate the information anew, and repeat until there are no more such
1399 // effects.
1400 void EffectChain::fix_internal_color_spaces()
1401 {
1402         unsigned colorspace_propagation_pass = 0;
1403         bool found_any;
1404         do {
1405                 found_any = false;
1406                 for (unsigned i = 0; i < nodes.size(); ++i) {
1407                         Node *node = nodes[i];
1408                         if (!node_needs_colorspace_fix(node)) {
1409                                 continue;
1410                         }
1411
1412                         // Go through each input that is not sRGB, and insert
1413                         // a colorspace conversion after it.
1414                         for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
1415                                 Node *input = node->incoming_links[j];
1416                                 assert(input->output_color_space != COLORSPACE_INVALID);
1417                                 if (input->output_color_space == COLORSPACE_sRGB) {
1418                                         continue;
1419                                 }
1420                                 Node *conversion = add_node(new ColorspaceConversionEffect());
1421                                 CHECK(conversion->effect->set_int("source_space", input->output_color_space));
1422                                 CHECK(conversion->effect->set_int("destination_space", COLORSPACE_sRGB));
1423                                 conversion->output_color_space = COLORSPACE_sRGB;
1424                                 replace_sender(input, conversion);
1425                                 connect_nodes(input, conversion);
1426                         }
1427
1428                         // Re-sort topologically, and propagate the new information.
1429                         propagate_gamma_and_color_space();
1430
1431                         found_any = true;
1432                         break;
1433                 }
1434
1435                 char filename[256];
1436                 sprintf(filename, "step5-colorspacefix-iter%u.dot", ++colorspace_propagation_pass);
1437                 output_dot(filename);
1438                 assert(colorspace_propagation_pass < 100);
1439         } while (found_any);
1440
1441         for (unsigned i = 0; i < nodes.size(); ++i) {
1442                 Node *node = nodes[i];
1443                 if (node->disabled) {
1444                         continue;
1445                 }
1446                 assert(node->output_color_space != COLORSPACE_INVALID);
1447         }
1448 }
1449
1450 bool EffectChain::node_needs_alpha_fix(Node *node)
1451 {
1452         if (node->disabled) {
1453                 return false;
1454         }
1455
1456         // propagate_alpha() has already set our output to ALPHA_INVALID if the
1457         // inputs differ or we are otherwise in mismatch, so we can rely on that.
1458         return (node->output_alpha_type == ALPHA_INVALID);
1459 }
1460
1461 // Fix up alpha so that there are no ALPHA_INVALID nodes left in
1462 // the graph. Similar to fix_internal_color_spaces().
1463 void EffectChain::fix_internal_alpha(unsigned step)
1464 {
1465         unsigned alpha_propagation_pass = 0;
1466         bool found_any;
1467         do {
1468                 found_any = false;
1469                 for (unsigned i = 0; i < nodes.size(); ++i) {
1470                         Node *node = nodes[i];
1471                         if (!node_needs_alpha_fix(node)) {
1472                                 continue;
1473                         }
1474
1475                         // If we need to fix up GammaExpansionEffect, then clearly something
1476                         // is wrong, since the combination of premultiplied alpha and nonlinear inputs
1477                         // is meaningless.
1478                         assert(node->effect->effect_type_id() != "GammaExpansionEffect");
1479
1480                         AlphaType desired_type = ALPHA_PREMULTIPLIED;
1481
1482                         // GammaCompressionEffect is special; it needs postmultiplied alpha.
1483                         if (node->effect->effect_type_id() == "GammaCompressionEffect") {
1484                                 assert(node->incoming_links.size() == 1);
1485                                 assert(node->incoming_links[0]->output_alpha_type == ALPHA_PREMULTIPLIED);
1486                                 desired_type = ALPHA_POSTMULTIPLIED;
1487                         }
1488
1489                         // Go through each input that is not premultiplied alpha, and insert
1490                         // a conversion before it.
1491                         for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
1492                                 Node *input = node->incoming_links[j];
1493                                 assert(input->output_alpha_type != ALPHA_INVALID);
1494                                 if (input->output_alpha_type == desired_type ||
1495                                     input->output_alpha_type == ALPHA_BLANK) {
1496                                         continue;
1497                                 }
1498                                 Node *conversion;
1499                                 if (desired_type == ALPHA_PREMULTIPLIED) {
1500                                         conversion = add_node(new AlphaMultiplicationEffect());
1501                                 } else {
1502                                         conversion = add_node(new AlphaDivisionEffect());
1503                                 }
1504                                 conversion->output_alpha_type = desired_type;
1505                                 replace_sender(input, conversion);
1506                                 connect_nodes(input, conversion);
1507                         }
1508
1509                         // Re-sort topologically, and propagate the new information.
1510                         propagate_gamma_and_color_space();
1511                         propagate_alpha();
1512
1513                         found_any = true;
1514                         break;
1515                 }
1516
1517                 char filename[256];
1518                 sprintf(filename, "step%u-alphafix-iter%u.dot", step, ++alpha_propagation_pass);
1519                 output_dot(filename);
1520                 assert(alpha_propagation_pass < 100);
1521         } while (found_any);
1522
1523         for (unsigned i = 0; i < nodes.size(); ++i) {
1524                 Node *node = nodes[i];
1525                 if (node->disabled) {
1526                         continue;
1527                 }
1528                 assert(node->output_alpha_type != ALPHA_INVALID);
1529         }
1530 }
1531
1532 // Make so that the output is in the desired color space.
1533 void EffectChain::fix_output_color_space()
1534 {
1535         Node *output = find_output_node();
1536         if (output->output_color_space != output_format.color_space) {
1537                 Node *conversion = add_node(new ColorspaceConversionEffect());
1538                 CHECK(conversion->effect->set_int("source_space", output->output_color_space));
1539                 CHECK(conversion->effect->set_int("destination_space", output_format.color_space));
1540                 conversion->output_color_space = output_format.color_space;
1541                 connect_nodes(output, conversion);
1542                 propagate_alpha();
1543                 propagate_gamma_and_color_space();
1544         }
1545 }
1546
1547 // Make so that the output is in the desired pre-/postmultiplication alpha state.
1548 void EffectChain::fix_output_alpha()
1549 {
1550         Node *output = find_output_node();
1551         assert(output->output_alpha_type != ALPHA_INVALID);
1552         if (output->output_alpha_type == ALPHA_BLANK) {
1553                 // No alpha output, so we don't care.
1554                 return;
1555         }
1556         if (output->output_alpha_type == ALPHA_PREMULTIPLIED &&
1557             output_alpha_format == OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED) {
1558                 Node *conversion = add_node(new AlphaDivisionEffect());
1559                 connect_nodes(output, conversion);
1560                 propagate_alpha();
1561                 propagate_gamma_and_color_space();
1562         }
1563         if (output->output_alpha_type == ALPHA_POSTMULTIPLIED &&
1564             output_alpha_format == OUTPUT_ALPHA_FORMAT_PREMULTIPLIED) {
1565                 Node *conversion = add_node(new AlphaMultiplicationEffect());
1566                 connect_nodes(output, conversion);
1567                 propagate_alpha();
1568                 propagate_gamma_and_color_space();
1569         }
1570 }
1571
1572 bool EffectChain::node_needs_gamma_fix(Node *node)
1573 {
1574         if (node->disabled) {
1575                 return false;
1576         }
1577
1578         // Small hack since the output is not an explicit node:
1579         // If we are the last node and our output is in the wrong
1580         // space compared to EffectChain's output, we need to fix it.
1581         // This will only take us to linear, but fix_output_gamma()
1582         // will come and take us to the desired output gamma
1583         // if it is needed.
1584         //
1585         // This needs to be before everything else, since it could
1586         // even apply to inputs (if they are the only effect).
1587         if (node->outgoing_links.empty() &&
1588             node->output_gamma_curve != output_format.gamma_curve &&
1589             node->output_gamma_curve != GAMMA_LINEAR) {
1590                 return true;
1591         }
1592
1593         if (node->effect->num_inputs() == 0) {
1594                 return false;
1595         }
1596
1597         // propagate_gamma_and_color_space() has already set our output
1598         // to GAMMA_INVALID if the inputs differ, so we can rely on that,
1599         // except for GammaCompressionEffect.
1600         if (node->output_gamma_curve == GAMMA_INVALID) {
1601                 return true;
1602         }
1603         if (node->effect->effect_type_id() == "GammaCompressionEffect") {
1604                 assert(node->incoming_links.size() == 1);
1605                 return node->incoming_links[0]->output_gamma_curve != GAMMA_LINEAR;
1606         }
1607
1608         return (node->effect->needs_linear_light() && node->output_gamma_curve != GAMMA_LINEAR);
1609 }
1610
1611 // Very similar to fix_internal_color_spaces(), but for gamma.
1612 // There is one difference, though; before we start adding conversion nodes,
1613 // we see if we can get anything out of asking the sources to deliver
1614 // linear gamma directly. fix_internal_gamma_by_asking_inputs()
1615 // does that part, while fix_internal_gamma_by_inserting_nodes()
1616 // inserts nodes as needed afterwards.
1617 void EffectChain::fix_internal_gamma_by_asking_inputs(unsigned step)
1618 {
1619         unsigned gamma_propagation_pass = 0;
1620         bool found_any;
1621         do {
1622                 found_any = false;
1623                 for (unsigned i = 0; i < nodes.size(); ++i) {
1624                         Node *node = nodes[i];
1625                         if (!node_needs_gamma_fix(node)) {
1626                                 continue;
1627                         }
1628
1629                         // See if all inputs can give us linear gamma. If not, leave it.
1630                         vector<Node *> nonlinear_inputs;
1631                         find_all_nonlinear_inputs(node, &nonlinear_inputs);
1632                         assert(!nonlinear_inputs.empty());
1633
1634                         bool all_ok = true;
1635                         for (unsigned i = 0; i < nonlinear_inputs.size(); ++i) {
1636                                 Input *input = static_cast<Input *>(nonlinear_inputs[i]->effect);
1637                                 all_ok &= input->can_output_linear_gamma();
1638                         }
1639
1640                         if (!all_ok) {
1641                                 continue;
1642                         }
1643
1644                         for (unsigned i = 0; i < nonlinear_inputs.size(); ++i) {
1645                                 CHECK(nonlinear_inputs[i]->effect->set_int("output_linear_gamma", 1));
1646                                 nonlinear_inputs[i]->output_gamma_curve = GAMMA_LINEAR;
1647                         }
1648
1649                         // Re-sort topologically, and propagate the new information.
1650                         propagate_gamma_and_color_space();
1651
1652                         found_any = true;
1653                         break;
1654                 }
1655
1656                 char filename[256];
1657                 sprintf(filename, "step%u-gammafix-iter%u.dot", step, ++gamma_propagation_pass);
1658                 output_dot(filename);
1659                 assert(gamma_propagation_pass < 100);
1660         } while (found_any);
1661 }
1662
1663 void EffectChain::fix_internal_gamma_by_inserting_nodes(unsigned step)
1664 {
1665         unsigned gamma_propagation_pass = 0;
1666         bool found_any;
1667         do {
1668                 found_any = false;
1669                 for (unsigned i = 0; i < nodes.size(); ++i) {
1670                         Node *node = nodes[i];
1671                         if (!node_needs_gamma_fix(node)) {
1672                                 continue;
1673                         }
1674
1675                         // Special case: We could be an input and still be asked to
1676                         // fix our gamma; if so, we should be the only node
1677                         // (as node_needs_gamma_fix() would only return true in
1678                         // for an input in that case). That means we should insert
1679                         // a conversion node _after_ ourselves.
1680                         if (node->incoming_links.empty()) {
1681                                 assert(node->outgoing_links.empty());
1682                                 Node *conversion = add_node(new GammaExpansionEffect());
1683                                 CHECK(conversion->effect->set_int("source_curve", node->output_gamma_curve));
1684                                 conversion->output_gamma_curve = GAMMA_LINEAR;
1685                                 connect_nodes(node, conversion);
1686                         }
1687
1688                         // If not, go through each input that is not linear gamma,
1689                         // and insert a gamma conversion after it.
1690                         for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
1691                                 Node *input = node->incoming_links[j];
1692                                 assert(input->output_gamma_curve != GAMMA_INVALID);
1693                                 if (input->output_gamma_curve == GAMMA_LINEAR) {
1694                                         continue;
1695                                 }
1696                                 Node *conversion = add_node(new GammaExpansionEffect());
1697                                 CHECK(conversion->effect->set_int("source_curve", input->output_gamma_curve));
1698                                 conversion->output_gamma_curve = GAMMA_LINEAR;
1699                                 replace_sender(input, conversion);
1700                                 connect_nodes(input, conversion);
1701                         }
1702
1703                         // Re-sort topologically, and propagate the new information.
1704                         propagate_alpha();
1705                         propagate_gamma_and_color_space();
1706
1707                         found_any = true;
1708                         break;
1709                 }
1710
1711                 char filename[256];
1712                 sprintf(filename, "step%u-gammafix-iter%u.dot", step, ++gamma_propagation_pass);
1713                 output_dot(filename);
1714                 assert(gamma_propagation_pass < 100);
1715         } while (found_any);
1716
1717         for (unsigned i = 0; i < nodes.size(); ++i) {
1718                 Node *node = nodes[i];
1719                 if (node->disabled) {
1720                         continue;
1721                 }
1722                 assert(node->output_gamma_curve != GAMMA_INVALID);
1723         }
1724 }
1725
1726 // Make so that the output is in the desired gamma.
1727 // Note that this assumes linear input gamma, so it might create the need
1728 // for another pass of fix_internal_gamma().
1729 void EffectChain::fix_output_gamma()
1730 {
1731         Node *output = find_output_node();
1732         if (output->output_gamma_curve != output_format.gamma_curve) {
1733                 Node *conversion = add_node(new GammaCompressionEffect());
1734                 CHECK(conversion->effect->set_int("destination_curve", output_format.gamma_curve));
1735                 conversion->output_gamma_curve = output_format.gamma_curve;
1736                 connect_nodes(output, conversion);
1737         }
1738 }
1739
1740 // If the user has requested Y'CbCr output, we need to do this conversion
1741 // _after_ GammaCompressionEffect etc., but before dither (see below).
1742 // This is because Y'CbCr, with the exception of a special optional mode
1743 // in Rec. 2020 (which we currently don't support), is defined to work on
1744 // gamma-encoded data.
1745 void EffectChain::add_ycbcr_conversion_if_needed()
1746 {
1747         assert(output_color_rgba || num_output_color_ycbcr > 0);
1748         if (num_output_color_ycbcr == 0) {
1749                 return;
1750         }
1751         Node *output = find_output_node();
1752         ycbcr_conversion_effect_node = add_node(new YCbCrConversionEffect(output_ycbcr_format, output_ycbcr_type));
1753         connect_nodes(output, ycbcr_conversion_effect_node);
1754 }
1755
1756 // If the user has requested dither, add a DitherEffect right at the end
1757 // (after GammaCompressionEffect etc.). This needs to be done after everything else,
1758 // since dither is about the only effect that can _not_ be done in linear space.
1759 void EffectChain::add_dither_if_needed()
1760 {
1761         if (num_dither_bits == 0) {
1762                 return;
1763         }
1764         Node *output = find_output_node();
1765         Node *dither = add_node(new DitherEffect());
1766         CHECK(dither->effect->set_int("num_bits", num_dither_bits));
1767         connect_nodes(output, dither);
1768
1769         dither_effect = dither->effect;
1770 }
1771
1772 // Compute shaders can't output to the framebuffer, so if the last
1773 // phase ends in a compute shader, add a dummy phase at the end that
1774 // only blits directly from the temporary texture.
1775 //
1776 // TODO: Add an API for rendering directly to textures, for the cases
1777 // where we're only rendering to an FBO anyway.
1778 void EffectChain::add_dummy_effect_if_needed()
1779 {
1780         Node *output = find_output_node();
1781
1782         // See if the last effect that's not strong one-to-one is a compute shader.
1783         Node *last_effect = output;
1784         while (last_effect->effect->num_inputs() == 1 &&
1785                last_effect->effect->strong_one_to_one_sampling()) {
1786                 last_effect = last_effect->incoming_links[0];
1787         }
1788         if (last_effect->effect->is_compute_shader()) {
1789                 Node *dummy = add_node(new ComputeShaderOutputDisplayEffect());
1790                 connect_nodes(output, dummy);
1791                 has_dummy_effect = true;
1792         }
1793 }
1794
1795 // Find the output node. This is, simply, one that has no outgoing links.
1796 // If there are multiple ones, the graph is malformed (we do not support
1797 // multiple outputs right now).
1798 Node *EffectChain::find_output_node()
1799 {
1800         vector<Node *> output_nodes;
1801         for (unsigned i = 0; i < nodes.size(); ++i) {
1802                 Node *node = nodes[i];
1803                 if (node->disabled) {
1804                         continue;
1805                 }
1806                 if (node->outgoing_links.empty()) {
1807                         output_nodes.push_back(node);
1808                 }
1809         }
1810         assert(output_nodes.size() == 1);
1811         return output_nodes[0];
1812 }
1813
1814 void EffectChain::finalize()
1815 {
1816         // Output the graph as it is before we do any conversions on it.
1817         output_dot("step0-start.dot");
1818
1819         // Give each effect in turn a chance to rewrite its own part of the graph.
1820         // Note that if more effects are added as part of this, they will be
1821         // picked up as part of the same for loop, since they are added at the end.
1822         for (unsigned i = 0; i < nodes.size(); ++i) {
1823                 nodes[i]->effect->rewrite_graph(this, nodes[i]);
1824         }
1825         output_dot("step1-rewritten.dot");
1826
1827         find_color_spaces_for_inputs();
1828         output_dot("step2-input-colorspace.dot");
1829
1830         propagate_alpha();
1831         output_dot("step3-propagated-alpha.dot");
1832
1833         propagate_gamma_and_color_space();
1834         output_dot("step4-propagated-all.dot");
1835
1836         fix_internal_color_spaces();
1837         fix_internal_alpha(6);
1838         fix_output_color_space();
1839         output_dot("step7-output-colorspacefix.dot");
1840         fix_output_alpha();
1841         output_dot("step8-output-alphafix.dot");
1842
1843         // Note that we need to fix gamma after colorspace conversion,
1844         // because colorspace conversions might create needs for gamma conversions.
1845         // Also, we need to run an extra pass of fix_internal_gamma() after
1846         // fixing the output gamma, as we only have conversions to/from linear,
1847         // and fix_internal_alpha() since GammaCompressionEffect needs
1848         // postmultiplied input.
1849         fix_internal_gamma_by_asking_inputs(9);
1850         fix_internal_gamma_by_inserting_nodes(10);
1851         fix_output_gamma();
1852         output_dot("step11-output-gammafix.dot");
1853         propagate_alpha();
1854         output_dot("step12-output-alpha-propagated.dot");
1855         fix_internal_alpha(13);
1856         output_dot("step14-output-alpha-fixed.dot");
1857         fix_internal_gamma_by_asking_inputs(15);
1858         fix_internal_gamma_by_inserting_nodes(16);
1859
1860         output_dot("step17-before-ycbcr.dot");
1861         add_ycbcr_conversion_if_needed();
1862
1863         output_dot("step18-before-dither.dot");
1864         add_dither_if_needed();
1865
1866         output_dot("step19-before-dummy-effect.dot");
1867         add_dummy_effect_if_needed();
1868
1869         output_dot("step20-final.dot");
1870
1871         // Construct all needed GLSL programs, starting at the output.
1872         // We need to keep track of which effects have already been computed,
1873         // as an effect with multiple users could otherwise be calculated
1874         // multiple times.
1875         map<Node *, Phase *> completed_effects;
1876         construct_phase(find_output_node(), &completed_effects);
1877
1878         output_dot("step21-split-to-phases.dot");
1879
1880         assert(phases[0]->inputs.empty());
1881
1882         finalized = true;
1883 }
1884
1885 void EffectChain::render_to_fbo(GLuint dest_fbo, unsigned width, unsigned height)
1886 {
1887         // Save original viewport.
1888         GLuint x = 0, y = 0;
1889
1890         if (width == 0 && height == 0) {
1891                 GLint viewport[4];
1892                 glGetIntegerv(GL_VIEWPORT, viewport);
1893                 x = viewport[0];
1894                 y = viewport[1];
1895                 width = viewport[2];
1896                 height = viewport[3];
1897         }
1898
1899         render(dest_fbo, {}, x, y, width, height);
1900 }
1901
1902 void EffectChain::render_to_texture(const vector<DestinationTexture> &destinations, unsigned width, unsigned height)
1903 {
1904         assert(finalized);
1905         assert(!destinations.empty());
1906
1907         if (!has_dummy_effect) {
1908                 // We don't end in a compute shader, so there's nothing specific for us to do.
1909                 // Create an FBO for this set of textures, and just render to that.
1910                 GLuint texnums[4] = { 0, 0, 0, 0 };
1911                 for (unsigned i = 0; i < destinations.size() && i < 4; ++i) {
1912                         texnums[i] = destinations[i].texnum;
1913                 }
1914                 GLuint dest_fbo = resource_pool->create_fbo(texnums[0], texnums[1], texnums[2], texnums[3]);
1915                 render(dest_fbo, {}, 0, 0, width, height);
1916                 resource_pool->release_fbo(dest_fbo);
1917         } else {
1918                 render((GLuint)-1, destinations, 0, 0, width, height);
1919         }
1920 }
1921
1922 void EffectChain::render(GLuint dest_fbo, const vector<DestinationTexture> &destinations, unsigned x, unsigned y, unsigned width, unsigned height)
1923 {
1924         assert(finalized);
1925         assert(destinations.size() <= 1);
1926
1927         // This needs to be set anew, in case we are coming from a different context
1928         // from when we initialized.
1929         check_error();
1930         glDisable(GL_DITHER);
1931         check_error();
1932
1933         const bool final_srgb = glIsEnabled(GL_FRAMEBUFFER_SRGB);
1934         check_error();
1935         bool current_srgb = final_srgb;
1936
1937         // Basic state.
1938         check_error();
1939         glDisable(GL_BLEND);
1940         check_error();
1941         glDisable(GL_DEPTH_TEST);
1942         check_error();
1943         glDepthMask(GL_FALSE);
1944         check_error();
1945
1946         set<Phase *> generated_mipmaps;
1947
1948         // We keep one texture per output, but only for as long as we actually have any
1949         // phases that need it as an input. (We don't make any effort to reorder phases
1950         // to minimize the number of textures in play, as register allocation can be
1951         // complicated and we rarely have much to gain, since our graphs are typically
1952         // pretty linear.)
1953         map<Phase *, GLuint> output_textures;
1954         map<Phase *, int> ref_counts;
1955         for (Phase *phase : phases) {
1956                 for (Phase *input : phase->inputs) {
1957                         ++ref_counts[input];
1958                 }
1959         }
1960
1961         size_t num_phases = phases.size();
1962         if (destinations.empty()) {
1963                 assert(dest_fbo != (GLuint)-1);
1964         } else {
1965                 assert(has_dummy_effect);
1966                 assert(x == 0);
1967                 assert(y == 0);
1968                 assert(num_phases >= 2);
1969                 assert(!phases.back()->is_compute_shader);
1970                 assert(phases.back()->effects.size() == 1);
1971                 assert(phases.back()->effects[0]->effect->effect_type_id() == "ComputeShaderOutputDisplayEffect");
1972
1973                 // We are rendering to a set of textures, so we can run the compute shader
1974                 // directly and skip the dummy phase.
1975                 --num_phases;
1976         }
1977
1978         for (unsigned phase_num = 0; phase_num < num_phases; ++phase_num) {
1979                 Phase *phase = phases[phase_num];
1980
1981                 if (do_phase_timing) {
1982                         GLuint timer_query_object;
1983                         if (phase->timer_query_objects_free.empty()) {
1984                                 glGenQueries(1, &timer_query_object);
1985                         } else {
1986                                 timer_query_object = phase->timer_query_objects_free.front();
1987                                 phase->timer_query_objects_free.pop_front();
1988                         }
1989                         glBeginQuery(GL_TIME_ELAPSED, timer_query_object);
1990                         phase->timer_query_objects_running.push_back(timer_query_object);
1991                 }
1992                 bool last_phase = (phase_num == num_phases - 1);
1993                 if (phase_num == num_phases - 1) {
1994                         // Last phase goes to the output the user specified.
1995                         if (!phase->is_compute_shader) {
1996                                 glBindFramebuffer(GL_FRAMEBUFFER, dest_fbo);
1997                                 check_error();
1998                                 GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
1999                                 assert(status == GL_FRAMEBUFFER_COMPLETE);
2000                                 glViewport(x, y, width, height);
2001                         }
2002                         if (dither_effect != nullptr) {
2003                                 CHECK(dither_effect->set_int("output_width", width));
2004                                 CHECK(dither_effect->set_int("output_height", height));
2005                         }
2006                 }
2007
2008                 // Enable sRGB rendering for intermediates in case we are
2009                 // rendering to an sRGB format.
2010                 // TODO: Support this for compute shaders.
2011                 bool needs_srgb = last_phase ? final_srgb : true;
2012                 if (needs_srgb && !current_srgb) {
2013                         glEnable(GL_FRAMEBUFFER_SRGB);
2014                         check_error();
2015                         current_srgb = true;
2016                 } else if (!needs_srgb && current_srgb) {
2017                         glDisable(GL_FRAMEBUFFER_SRGB);
2018                         check_error();
2019                         current_srgb = true;
2020                 }
2021
2022                 // Find a texture for this phase.
2023                 inform_input_sizes(phase);
2024                 find_output_size(phase);
2025                 vector<DestinationTexture> phase_destinations;
2026                 if (!last_phase) {
2027                         GLuint tex_num = resource_pool->create_2d_texture(intermediate_format, phase->output_width, phase->output_height);
2028                         output_textures.insert(make_pair(phase, tex_num));
2029                         phase_destinations.push_back(DestinationTexture{ tex_num, intermediate_format });
2030
2031                         // The output texture needs to have valid state to be written to by a compute shader.
2032                         glActiveTexture(GL_TEXTURE0);
2033                         check_error();
2034                         glBindTexture(GL_TEXTURE_2D, tex_num);
2035                         check_error();
2036                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
2037                         check_error();
2038                 } else if (phase->is_compute_shader) {
2039                         assert(!destinations.empty());
2040                         phase_destinations = destinations;
2041                 }
2042
2043                 execute_phase(phase, output_textures, phase_destinations, &generated_mipmaps);
2044                 if (do_phase_timing) {
2045                         glEndQuery(GL_TIME_ELAPSED);
2046                 }
2047
2048                 // Drop any input textures we don't need anymore.
2049                 for (Phase *input : phase->inputs) {
2050                         assert(ref_counts[input] > 0);
2051                         if (--ref_counts[input] == 0) {
2052                                 resource_pool->release_2d_texture(output_textures[input]);
2053                                 output_textures.erase(input);
2054                         }
2055                 }
2056         }
2057
2058         for (const auto &phase_and_texnum : output_textures) {
2059                 resource_pool->release_2d_texture(phase_and_texnum.second);
2060         }
2061
2062         glBindFramebuffer(GL_FRAMEBUFFER, 0);
2063         check_error();
2064         glUseProgram(0);
2065         check_error();
2066
2067         glBindBuffer(GL_ARRAY_BUFFER, 0);
2068         check_error();
2069         glBindVertexArray(0);
2070         check_error();
2071
2072         if (do_phase_timing) {
2073                 // Get back the timer queries.
2074                 for (unsigned phase_num = 0; phase_num < phases.size(); ++phase_num) {
2075                         Phase *phase = phases[phase_num];
2076                         for (auto timer_it = phase->timer_query_objects_running.cbegin();
2077                              timer_it != phase->timer_query_objects_running.cend(); ) {
2078                                 GLint timer_query_object = *timer_it;
2079                                 GLint available;
2080                                 glGetQueryObjectiv(timer_query_object, GL_QUERY_RESULT_AVAILABLE, &available);
2081                                 if (available) {
2082                                         GLuint64 time_elapsed;
2083                                         glGetQueryObjectui64v(timer_query_object, GL_QUERY_RESULT, &time_elapsed);
2084                                         phase->time_elapsed_ns += time_elapsed;
2085                                         ++phase->num_measured_iterations;
2086                                         phase->timer_query_objects_free.push_back(timer_query_object);
2087                                         phase->timer_query_objects_running.erase(timer_it++);
2088                                 } else {
2089                                         ++timer_it;
2090                                 }
2091                         }
2092                 }
2093         }
2094 }
2095
2096 void EffectChain::enable_phase_timing(bool enable)
2097 {
2098         if (enable) {
2099                 assert(movit_timer_queries_supported);
2100         }
2101         this->do_phase_timing = enable;
2102 }
2103
2104 void EffectChain::reset_phase_timing()
2105 {
2106         for (unsigned phase_num = 0; phase_num < phases.size(); ++phase_num) {
2107                 Phase *phase = phases[phase_num];
2108                 phase->time_elapsed_ns = 0;
2109                 phase->num_measured_iterations = 0;
2110         }
2111 }
2112
2113 void EffectChain::print_phase_timing()
2114 {
2115         double total_time_ms = 0.0;
2116         for (unsigned phase_num = 0; phase_num < phases.size(); ++phase_num) {
2117                 Phase *phase = phases[phase_num];
2118                 double avg_time_ms = phase->time_elapsed_ns * 1e-6 / phase->num_measured_iterations;
2119                 printf("Phase %d: %5.1f ms  [", phase_num, avg_time_ms);
2120                 for (unsigned effect_num = 0; effect_num < phase->effects.size(); ++effect_num) {
2121                         if (effect_num != 0) {
2122                                 printf(", ");
2123                         }
2124                         printf("%s", phase->effects[effect_num]->effect->effect_type_id().c_str());
2125                 }
2126                 printf("]\n");
2127                 total_time_ms += avg_time_ms;
2128         }
2129         printf("Total:   %5.1f ms\n", total_time_ms);
2130 }
2131
2132 void EffectChain::execute_phase(Phase *phase,
2133                                 const map<Phase *, GLuint> &output_textures,
2134                                 const std::vector<DestinationTexture> &destinations,
2135                                 set<Phase *> *generated_mipmaps)
2136 {
2137         // Set up RTT inputs for this phase.
2138         for (unsigned sampler = 0; sampler < phase->inputs.size(); ++sampler) {
2139                 glActiveTexture(GL_TEXTURE0 + sampler);
2140                 Phase *input = phase->inputs[sampler];
2141                 input->output_node->bound_sampler_num = sampler;
2142                 const auto it = output_textures.find(input);
2143                 assert(it != output_textures.end());
2144                 glBindTexture(GL_TEXTURE_2D, it->second);
2145                 check_error();
2146                 if (phase->input_needs_mipmaps && generated_mipmaps->count(input) == 0) {
2147                         glGenerateMipmap(GL_TEXTURE_2D);
2148                         check_error();
2149                         generated_mipmaps->insert(input);
2150                 }
2151                 setup_rtt_sampler(sampler, phase->input_needs_mipmaps);
2152                 phase->input_samplers[sampler] = sampler;  // Bind the sampler to the right uniform.
2153         }
2154
2155         GLuint instance_program_num = resource_pool->use_glsl_program(phase->glsl_program_num);
2156         check_error();
2157
2158         // And now the output.
2159         GLuint fbo = 0;
2160         if (phase->is_compute_shader) {
2161                 assert(!destinations.empty());
2162
2163                 // This is currently the only place where we use image units,
2164                 // so we can always start at 0. TODO: Support multiple destinations.
2165                 phase->outbuf_image_unit = 0;
2166                 glBindImageTexture(phase->outbuf_image_unit, destinations[0].texnum, 0, GL_FALSE, 0, GL_WRITE_ONLY, destinations[0].format);
2167                 check_error();
2168                 phase->uniform_output_size[0] = phase->output_width;
2169                 phase->uniform_output_size[1] = phase->output_height;
2170                 phase->inv_output_size.x = 1.0f / phase->output_width;
2171                 phase->inv_output_size.y = 1.0f / phase->output_height;
2172                 phase->output_texcoord_adjust.x = 0.5f / phase->output_width;
2173                 phase->output_texcoord_adjust.y = 0.5f / phase->output_height;
2174         } else if (!destinations.empty()) {
2175                 assert(destinations.size() == 1);
2176                 fbo = resource_pool->create_fbo(destinations[0].texnum);
2177                 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
2178                 glViewport(0, 0, phase->output_width, phase->output_height);
2179         }
2180
2181         // Give the required parameters to all the effects.
2182         unsigned sampler_num = phase->inputs.size();
2183         for (unsigned i = 0; i < phase->effects.size(); ++i) {
2184                 Node *node = phase->effects[i];
2185                 unsigned old_sampler_num = sampler_num;
2186                 node->effect->set_gl_state(instance_program_num, phase->effect_ids[node], &sampler_num);
2187                 check_error();
2188
2189                 if (node->effect->is_single_texture()) {
2190                         assert(sampler_num - old_sampler_num == 1);
2191                         node->bound_sampler_num = old_sampler_num;
2192                 } else {
2193                         node->bound_sampler_num = -1;
2194                 }
2195         }
2196
2197         if (phase->is_compute_shader) {
2198                 unsigned x, y, z;
2199                 phase->compute_shader_node->effect->get_compute_dimensions(phase->output_width, phase->output_height, &x, &y, &z);
2200
2201                 // Uniforms need to come after set_gl_state() _and_ get_compute_dimensions(),
2202                 // since they can be updated from there.
2203                 setup_uniforms(phase);
2204                 glDispatchCompute(x, y, z);
2205                 check_error();
2206                 glMemoryBarrier(GL_TEXTURE_FETCH_BARRIER_BIT | GL_TEXTURE_UPDATE_BARRIER_BIT);
2207                 check_error();
2208         } else {
2209                 // Uniforms need to come after set_gl_state(), since they can be updated
2210                 // from there.
2211                 setup_uniforms(phase);
2212
2213                 // Bind the vertex data.
2214                 GLuint vao = resource_pool->create_vec2_vao(phase->attribute_indexes, vbo);
2215                 glBindVertexArray(vao);
2216
2217                 glDrawArrays(GL_TRIANGLES, 0, 3);
2218                 check_error();
2219
2220                 resource_pool->release_vec2_vao(vao);
2221         }
2222
2223         for (unsigned i = 0; i < phase->effects.size(); ++i) {
2224                 Node *node = phase->effects[i];
2225                 node->effect->clear_gl_state();
2226         }
2227
2228         resource_pool->unuse_glsl_program(instance_program_num);
2229
2230         if (fbo != 0) {
2231                 resource_pool->release_fbo(fbo);
2232         }
2233 }
2234
2235 void EffectChain::setup_uniforms(Phase *phase)
2236 {
2237         // TODO: Use UBO blocks.
2238         for (size_t i = 0; i < phase->uniforms_image2d.size(); ++i) {
2239                 const Uniform<int> &uniform = phase->uniforms_image2d[i];
2240                 if (uniform.location != -1) {
2241                         glUniform1iv(uniform.location, uniform.num_values, uniform.value);
2242                 }
2243         }
2244         for (size_t i = 0; i < phase->uniforms_sampler2d.size(); ++i) {
2245                 const Uniform<int> &uniform = phase->uniforms_sampler2d[i];
2246                 if (uniform.location != -1) {
2247                         glUniform1iv(uniform.location, uniform.num_values, uniform.value);
2248                 }
2249         }
2250         for (size_t i = 0; i < phase->uniforms_bool.size(); ++i) {
2251                 const Uniform<bool> &uniform = phase->uniforms_bool[i];
2252                 assert(uniform.num_values == 1);
2253                 if (uniform.location != -1) {
2254                         glUniform1i(uniform.location, *uniform.value);
2255                 }
2256         }
2257         for (size_t i = 0; i < phase->uniforms_int.size(); ++i) {
2258                 const Uniform<int> &uniform = phase->uniforms_int[i];
2259                 if (uniform.location != -1) {
2260                         glUniform1iv(uniform.location, uniform.num_values, uniform.value);
2261                 }
2262         }
2263         for (size_t i = 0; i < phase->uniforms_ivec2.size(); ++i) {
2264                 const Uniform<int> &uniform = phase->uniforms_ivec2[i];
2265                 if (uniform.location != -1) {
2266                         glUniform2iv(uniform.location, uniform.num_values, uniform.value);
2267                 }
2268         }
2269         for (size_t i = 0; i < phase->uniforms_float.size(); ++i) {
2270                 const Uniform<float> &uniform = phase->uniforms_float[i];
2271                 if (uniform.location != -1) {
2272                         glUniform1fv(uniform.location, uniform.num_values, uniform.value);
2273                 }
2274         }
2275         for (size_t i = 0; i < phase->uniforms_vec2.size(); ++i) {
2276                 const Uniform<float> &uniform = phase->uniforms_vec2[i];
2277                 if (uniform.location != -1) {
2278                         glUniform2fv(uniform.location, uniform.num_values, uniform.value);
2279                 }
2280         }
2281         for (size_t i = 0; i < phase->uniforms_vec3.size(); ++i) {
2282                 const Uniform<float> &uniform = phase->uniforms_vec3[i];
2283                 if (uniform.location != -1) {
2284                         glUniform3fv(uniform.location, uniform.num_values, uniform.value);
2285                 }
2286         }
2287         for (size_t i = 0; i < phase->uniforms_vec4.size(); ++i) {
2288                 const Uniform<float> &uniform = phase->uniforms_vec4[i];
2289                 if (uniform.location != -1) {
2290                         glUniform4fv(uniform.location, uniform.num_values, uniform.value);
2291                 }
2292         }
2293         for (size_t i = 0; i < phase->uniforms_mat3.size(); ++i) {
2294                 const Uniform<Matrix3d> &uniform = phase->uniforms_mat3[i];
2295                 assert(uniform.num_values == 1);
2296                 if (uniform.location != -1) {
2297                         // Convert to float (GLSL has no double matrices).
2298                         float matrixf[9];
2299                         for (unsigned y = 0; y < 3; ++y) {
2300                                 for (unsigned x = 0; x < 3; ++x) {
2301                                         matrixf[y + x * 3] = (*uniform.value)(y, x);
2302                                 }
2303                         }
2304                         glUniformMatrix3fv(uniform.location, 1, GL_FALSE, matrixf);
2305                 }
2306         }
2307 }
2308
2309 void EffectChain::setup_rtt_sampler(int sampler_num, bool use_mipmaps)
2310 {
2311         glActiveTexture(GL_TEXTURE0 + sampler_num);
2312         check_error();
2313         if (use_mipmaps) {
2314                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
2315                 check_error();
2316         } else {
2317                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
2318                 check_error();
2319         }
2320         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
2321         check_error();
2322         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
2323         check_error();
2324 }
2325
2326 }  // namespace movit