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 = false;
 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_vec2("inv_output_size", (float *)&phase->inv_output_size);
 527                 phase->compute_shader_node->effect->register_uniform_vec2("output_texcoord_adjust", (float *)&phase->output_texcoord_adjust);
 528         } else {
 529                 frag_shader.append(read_file("footer.frag"));
 530         }
 531
 532         // Collect uniforms from all effects and output them. Note that this needs
 533         // to happen after output_fragment_shader(), even though the uniforms come
 534         // before in the output source, since output_fragment_shader() is allowed
 535         // to register new uniforms (e.g. arrays that are of unknown length until
 536         // finalization time).
 537         // TODO: Make a uniform block for platforms that support it.
 538         string frag_shader_uniforms = "";
 539         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 540                 Node *node = phase->effects[i];
 541                 Effect *effect = node->effect;
 542                 const string effect_id = phase->effect_ids[node];
 543                 extract_uniform_declarations(effect->uniforms_image2d, "image2D", effect_id, &phase->uniforms_image2d, &frag_shader_uniforms);
 544                 extract_uniform_declarations(effect->uniforms_sampler2d, "sampler2D", effect_id, &phase->uniforms_sampler2d, &frag_shader_uniforms);
 545                 extract_uniform_declarations(effect->uniforms_bool, "bool", effect_id, &phase->uniforms_bool, &frag_shader_uniforms);
 546                 extract_uniform_declarations(effect->uniforms_int, "int", effect_id, &phase->uniforms_int, &frag_shader_uniforms);
 547                 extract_uniform_declarations(effect->uniforms_float, "float", effect_id, &phase->uniforms_float, &frag_shader_uniforms);
 548                 extract_uniform_declarations(effect->uniforms_vec2, "vec2", effect_id, &phase->uniforms_vec2, &frag_shader_uniforms);
 549                 extract_uniform_declarations(effect->uniforms_vec3, "vec3", effect_id, &phase->uniforms_vec3, &frag_shader_uniforms);
 550                 extract_uniform_declarations(effect->uniforms_vec4, "vec4", effect_id, &phase->uniforms_vec4, &frag_shader_uniforms);
 551                 extract_uniform_array_declarations(effect->uniforms_float_array, "float", effect_id, &phase->uniforms_float, &frag_shader_uniforms);
 552                 extract_uniform_array_declarations(effect->uniforms_vec2_array, "vec2", effect_id, &phase->uniforms_vec2, &frag_shader_uniforms);
 553                 extract_uniform_array_declarations(effect->uniforms_vec3_array, "vec3", effect_id, &phase->uniforms_vec3, &frag_shader_uniforms);
 554                 extract_uniform_array_declarations(effect->uniforms_vec4_array, "vec4", effect_id, &phase->uniforms_vec4, &frag_shader_uniforms);
 555                 extract_uniform_declarations(effect->uniforms_mat3, "mat3", effect_id, &phase->uniforms_mat3, &frag_shader_uniforms);
 556         }
 557
 558         frag_shader = frag_shader_header + frag_shader_uniforms + frag_shader;
 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 shader so.
 564         if (phase->output_node->outgoing_links.empty() && output_origin == OUTPUT_ORIGIN_TOP_LEFT) {
 565                 const string needle = "#define FLIP_ORIGIN 0";
 566                 size_t pos = vert_shader.find(needle);
 567                 assert(pos != string::npos);
 568
 569                 vert_shader[pos + needle.size() - 1] = '1';
 570         }
 571
 572         if (phase->is_compute_shader) {
 573                 phase->glsl_program_num = resource_pool->compile_glsl_compute_program(frag_shader);
 574
 575                 Uniform<int> uniform;
 576                 uniform.name = "outbuf";
 577                 uniform.value = &phase->outbuf_image_unit;
 578                 uniform.prefix = "tex";
 579                 uniform.num_values = 1;
 580                 uniform.location = -1;
 581                 phase->uniforms_image2d.push_back(uniform);
 582         } else {
 583                 phase->glsl_program_num = resource_pool->compile_glsl_program(vert_shader, frag_shader, frag_shader_outputs);
 584         }
 585         GLint position_attribute_index = glGetAttribLocation(phase->glsl_program_num, "position");
 586         GLint texcoord_attribute_index = glGetAttribLocation(phase->glsl_program_num, "texcoord");
 587         if (position_attribute_index != -1) {
 588                 phase->attribute_indexes.insert(position_attribute_index);
 589         }
 590         if (texcoord_attribute_index != -1) {
 591                 phase->attribute_indexes.insert(texcoord_attribute_index);
 592         }
 593
 594         // Collect the resulting location numbers for each uniform.
 595         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_image2d);
 596         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_sampler2d);
 597         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_bool);
 598         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_int);
 599         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_float);
 600         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_vec2);
 601         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_vec3);
 602         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_vec4);
 603         collect_uniform_locations(phase->glsl_program_num, &phase->uniforms_mat3);
 604 }
 605
 606 // Construct GLSL programs, starting at the given effect and following
 607 // the chain from there. We end a program every time we come to an effect
 608 // marked as "needs texture bounce", one that is used by multiple other
 609 // effects, every time we need to bounce due to output size change
 610 // (not all size changes require ending), and of course at the end.
 611 //
 612 // We follow a quite simple depth-first search from the output, although
 613 // without recursing explicitly within each phase.
 614 Phase *EffectChain::construct_phase(Node *output, map<Node *, Phase *> *completed_effects)
 615 {
 616         if (completed_effects->count(output)) {
 617                 return (*completed_effects)[output];
 618         }
 619
 620         Phase *phase = new Phase;
 621         phase->output_node = output;
 622         phase->is_compute_shader = false;
 623         phase->compute_shader_node = nullptr;
 624
 625         // If the output effect has one-to-one sampling, we try to trace this
 626         // status down through the dependency chain. This is important in case
 627         // we hit an effect that changes output size (and not sets a virtual
 628         // output size); if we have one-to-one sampling, we don't have to break
 629         // the phase.
 630         output->one_to_one_sampling = output->effect->one_to_one_sampling();
 631         output->strong_one_to_one_sampling = output->effect->strong_one_to_one_sampling();
 632
 633         // Effects that we have yet to calculate, but that we know should
 634         // be in the current phase.
 635         stack<Node *> effects_todo_this_phase;
 636         effects_todo_this_phase.push(output);
 637
 638         while (!effects_todo_this_phase.empty()) {
 639                 Node *node = effects_todo_this_phase.top();
 640                 effects_todo_this_phase.pop();
 641
 642                 assert(node->effect->one_to_one_sampling() >= node->effect->strong_one_to_one_sampling());
 643
 644                 if (node->effect->needs_mipmaps()) {
 645                         node->needs_mipmaps = true;
 646                 }
 647
 648                 // This should currently only happen for effects that are inputs
 649                 // (either true inputs or phase outputs). We special-case inputs,
 650                 // and then deduplicate phase outputs below.
 651                 if (node->effect->num_inputs() == 0) {
 652                         if (find(phase->effects.begin(), phase->effects.end(), node) != phase->effects.end()) {
 653                                 continue;
 654                         }
 655                 } else {
 656                         assert(completed_effects->count(node) == 0);
 657                 }
 658
 659                 phase->effects.push_back(node);
 660                 if (node->effect->is_compute_shader()) {
 661                         phase->is_compute_shader = true;
 662                         phase->compute_shader_node = node;
 663                 }
 664
 665                 // Find all the dependencies of this effect, and add them to the stack.
 666                 vector<Node *> deps = node->incoming_links;
 667                 assert(node->effect->num_inputs() == deps.size());
 668                 for (unsigned i = 0; i < deps.size(); ++i) {
 669                         bool start_new_phase = false;
 670
 671                         if (node->effect->needs_texture_bounce() &&
 672                             !deps[i]->effect->is_single_texture() &&
 673                             !deps[i]->effect->override_disable_bounce()) {
 674                                 start_new_phase = true;
 675                         }
 676
 677                         // Propagate information about needing mipmaps down the chain,
 678                         // breaking the phase if we notice an incompatibility.
 679                         //
 680                         // Note that we cannot do this propagation as a normal pass,
 681                         // because it needs information about where the phases end
 682                         // (we should not propagate the flag across phases).
 683                         if (node->needs_mipmaps) {
 684                                 if (deps[i]->effect->num_inputs() == 0) {
 685                                         Input *input = static_cast<Input *>(deps[i]->effect);
 686                                         start_new_phase |= !input->can_supply_mipmaps();
 687                                 } else {
 688                                         deps[i]->needs_mipmaps = true;
 689                                 }
 690                         }
 691
 692                         if (deps[i]->outgoing_links.size() > 1) {
 693                                 if (!deps[i]->effect->is_single_texture()) {
 694                                         // More than one effect uses this as the input,
 695                                         // and it is not a texture itself.
 696                                         // The easiest thing to do (and probably also the safest
 697                                         // performance-wise in most cases) is to bounce it to a texture
 698                                         // and then let the next passes read from that.
 699                                         start_new_phase = true;
 700                                 } else {
 701                                         assert(deps[i]->effect->num_inputs() == 0);
 702
 703                                         // For textures, we try to be slightly more clever;
 704                                         // if none of our outputs need a bounce, we don't bounce
 705                                         // but instead simply use the effect many times.
 706                                         //
 707                                         // Strictly speaking, we could bounce it for some outputs
 708                                         // and use it directly for others, but the processing becomes
 709                                         // somewhat simpler if the effect is only used in one such way.
 710                                         for (unsigned j = 0; j < deps[i]->outgoing_links.size(); ++j) {
 711                                                 Node *rdep = deps[i]->outgoing_links[j];
 712                                                 start_new_phase |= rdep->effect->needs_texture_bounce();
 713                                         }
 714                                 }
 715                         }
 716
 717                         if (deps[i]->effect->is_compute_shader()) {
 718                                 // Only one compute shader per phase; we should have been stopped
 719                                 // already due to the fact that compute shaders are not one-to-one.
 720                                 assert(!phase->is_compute_shader);
 721
 722                                 // If all nodes so far are strong one-to-one, we can put them after
 723                                 // the compute shader (ie., process them on the output).
 724                                 start_new_phase = !node->strong_one_to_one_sampling;
 725                         } else if (deps[i]->effect->sets_virtual_output_size()) {
 726                                 assert(deps[i]->effect->changes_output_size());
 727                                 // If the next effect sets a virtual size to rely on OpenGL's
 728                                 // bilinear sampling, we'll really need to break the phase here.
 729                                 start_new_phase = true;
 730                         } else if (deps[i]->effect->changes_output_size() && !node->one_to_one_sampling) {
 731                                 // If the next effect changes size and we don't have one-to-one sampling,
 732                                 // we also need to break here.
 733                                 start_new_phase = true;
 734                         }
 735
 736                         if (start_new_phase) {
 737                                 phase->inputs.push_back(construct_phase(deps[i], completed_effects));
 738                         } else {
 739                                 effects_todo_this_phase.push(deps[i]);
 740
 741                                 // Propagate the one-to-one status down through the dependency.
 742                                 deps[i]->one_to_one_sampling = node->one_to_one_sampling &&
 743                                         deps[i]->effect->one_to_one_sampling();
 744                                 deps[i]->strong_one_to_one_sampling = node->strong_one_to_one_sampling &&
 745                                         deps[i]->effect->strong_one_to_one_sampling();
 746                         }
 747                 }
 748         }
 749
 750         // No more effects to do this phase. Take all the ones we have,
 751         // and create a GLSL program for it.
 752         assert(!phase->effects.empty());
 753
 754         // Deduplicate the inputs, but don't change the ordering e.g. by sorting;
 755         // that would be nondeterministic and thus reduce cacheability.
 756         // TODO: Make this even more deterministic.
 757         vector<Phase *> dedup_inputs;
 758         set<Phase *> seen_inputs;
 759         for (size_t i = 0; i < phase->inputs.size(); ++i) {
 760                 if (seen_inputs.insert(phase->inputs[i]).second) {
 761                         dedup_inputs.push_back(phase->inputs[i]);
 762                 }
 763         }
 764         swap(phase->inputs, dedup_inputs);
 765
 766         // Allocate samplers for each input.
 767         phase->input_samplers.resize(phase->inputs.size());
 768
 769         // We added the effects from the output and back, but we need to output
 770         // them in topological sort order in the shader.
 771         phase->effects = topological_sort(phase->effects);
 772
 773         // Figure out if we need mipmaps or not, and if so, tell the inputs that.
 774         phase->input_needs_mipmaps = false;
 775         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 776                 Node *node = phase->effects[i];
 777                 phase->input_needs_mipmaps |= node->effect->needs_mipmaps();
 778         }
 779         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 780                 Node *node = phase->effects[i];
 781                 if (node->effect->num_inputs() == 0) {
 782                         Input *input = static_cast<Input *>(node->effect);
 783                         assert(!phase->input_needs_mipmaps || input->can_supply_mipmaps());
 784                         CHECK(input->set_int("needs_mipmaps", phase->input_needs_mipmaps));
 785                 }
 786         }
 787
 788         // Tell each node which phase it ended up in, so that the unit test
 789         // can check that the phases were split in the right place.
 790         // Note that this ignores that effects may be part of multiple phases;
 791         // if the unit tests need to test such cases, we'll reconsider.
 792         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 793                 phase->effects[i]->containing_phase = phase;
 794         }
 795
 796         // Actually make the shader for this phase.
 797         compile_glsl_program(phase);
 798
 799         // Initialize timers.
 800         if (movit_timer_queries_supported) {
 801                 phase->time_elapsed_ns = 0;
 802                 phase->num_measured_iterations = 0;
 803         }
 804
 805         assert(completed_effects->count(output) == 0);
 806         completed_effects->insert(make_pair(output, phase));
 807         phases.push_back(phase);
 808         return phase;
 809 }
 810
 811 void EffectChain::output_dot(const char *filename)
 812 {
 813         if (movit_debug_level != MOVIT_DEBUG_ON) {
 814                 return;
 815         }
 816
 817         FILE *fp = fopen(filename, "w");
 818         if (fp == nullptr) {
 819                 perror(filename);
 820                 exit(1);
 821         }
 822
 823         fprintf(fp, "digraph G {\n");
 824         fprintf(fp, "  output [shape=box label=\"(output)\"];\n");
 825         for (unsigned i = 0; i < nodes.size(); ++i) {
 826                 // Find out which phase this event belongs to.
 827                 vector<int> in_phases;
 828                 for (unsigned j = 0; j < phases.size(); ++j) {
 829                         const Phase* p = phases[j];
 830                         if (find(p->effects.begin(), p->effects.end(), nodes[i]) != p->effects.end()) {
 831                                 in_phases.push_back(j);
 832                         }
 833                 }
 834
 835                 if (in_phases.empty()) {
 836                         fprintf(fp, "  n%ld [label=\"%s\"];\n", (long)nodes[i], nodes[i]->effect->effect_type_id().c_str());
 837                 } else if (in_phases.size() == 1) {
 838                         fprintf(fp, "  n%ld [label=\"%s\" style=\"filled\" fillcolor=\"/accent8/%d\"];\n",
 839                                 (long)nodes[i], nodes[i]->effect->effect_type_id().c_str(),
 840                                 (in_phases[0] % 8) + 1);
 841                 } else {
 842                         // If we had new enough Graphviz, style="wedged" would probably be ideal here.
 843                         // But alas.
 844                         fprintf(fp, "  n%ld [label=\"%s [in multiple phases]\" style=\"filled\" fillcolor=\"/accent8/%d\"];\n",
 845                                 (long)nodes[i], nodes[i]->effect->effect_type_id().c_str(),
 846                                 (in_phases[0] % 8) + 1);
 847                 }
 848
 849                 char from_node_id[256];
 850                 snprintf(from_node_id, 256, "n%ld", (long)nodes[i]);
 851
 852                 for (unsigned j = 0; j < nodes[i]->outgoing_links.size(); ++j) {
 853                         char to_node_id[256];
 854                         snprintf(to_node_id, 256, "n%ld", (long)nodes[i]->outgoing_links[j]);
 855
 856                         vector<string> labels = get_labels_for_edge(nodes[i], nodes[i]->outgoing_links[j]);
 857                         output_dot_edge(fp, from_node_id, to_node_id, labels);
 858                 }
 859
 860                 if (nodes[i]->outgoing_links.empty() && !nodes[i]->disabled) {
 861                         // Output node.
 862                         vector<string> labels = get_labels_for_edge(nodes[i], nullptr);
 863                         output_dot_edge(fp, from_node_id, "output", labels);
 864                 }
 865         }
 866         fprintf(fp, "}\n");
 867
 868         fclose(fp);
 869 }
 870
 871 vector<string> EffectChain::get_labels_for_edge(const Node *from, const Node *to)
 872 {
 873         vector<string> labels;
 874
 875         if (to != nullptr && to->effect->needs_texture_bounce()) {
 876                 labels.push_back("needs_bounce");
 877         }
 878         if (from->effect->changes_output_size()) {
 879                 labels.push_back("resize");
 880         }
 881
 882         switch (from->output_color_space) {
 883         case COLORSPACE_INVALID:
 884                 labels.push_back("spc[invalid]");
 885                 break;
 886         case COLORSPACE_REC_601_525:
 887                 labels.push_back("spc[rec601-525]");
 888                 break;
 889         case COLORSPACE_REC_601_625:
 890                 labels.push_back("spc[rec601-625]");
 891                 break;
 892         default:
 893                 break;
 894         }
 895
 896         switch (from->output_gamma_curve) {
 897         case GAMMA_INVALID:
 898                 labels.push_back("gamma[invalid]");
 899                 break;
 900         case GAMMA_sRGB:
 901                 labels.push_back("gamma[sRGB]");
 902                 break;
 903         case GAMMA_REC_601:  // and GAMMA_REC_709
 904                 labels.push_back("gamma[rec601/709]");
 905                 break;
 906         default:
 907                 break;
 908         }
 909
 910         switch (from->output_alpha_type) {
 911         case ALPHA_INVALID:
 912                 labels.push_back("alpha[invalid]");
 913                 break;
 914         case ALPHA_BLANK:
 915                 labels.push_back("alpha[blank]");
 916                 break;
 917         case ALPHA_POSTMULTIPLIED:
 918                 labels.push_back("alpha[postmult]");
 919                 break;
 920         default:
 921                 break;
 922         }
 923
 924         return labels;
 925 }
 926
 927 void EffectChain::output_dot_edge(FILE *fp,
 928                                   const string &from_node_id,
 929                                   const string &to_node_id,
 930                                   const vector<string> &labels)
 931 {
 932         if (labels.empty()) {
 933                 fprintf(fp, "  %s -> %s;\n", from_node_id.c_str(), to_node_id.c_str());
 934         } else {
 935                 string label = labels[0];
 936                 for (unsigned k = 1; k < labels.size(); ++k) {
 937                         label += ", " + labels[k];
 938                 }
 939                 fprintf(fp, "  %s -> %s [label=\"%s\"];\n", from_node_id.c_str(), to_node_id.c_str(), label.c_str());
 940         }
 941 }
 942
 943 void EffectChain::size_rectangle_to_fit(unsigned width, unsigned height, unsigned *output_width, unsigned *output_height)
 944 {
 945         unsigned scaled_width, scaled_height;
 946
 947         if (float(width) * aspect_denom >= float(height) * aspect_nom) {
 948                 // Same aspect, or W/H > aspect (image is wider than the frame).
 949                 // In either case, keep width, and adjust height.
 950                 scaled_width = width;
 951                 scaled_height = lrintf(width * aspect_denom / aspect_nom);
 952         } else {
 953                 // W/H < aspect (image is taller than the frame), so keep height,
 954                 // and adjust width.
 955                 scaled_width = lrintf(height * aspect_nom / aspect_denom);
 956                 scaled_height = height;
 957         }
 958
 959         // We should be consistently larger or smaller then the existing choice,
 960         // since we have the same aspect.
 961         assert(!(scaled_width < *output_width && scaled_height > *output_height));
 962         assert(!(scaled_height < *output_height && scaled_width > *output_width));
 963
 964         if (scaled_width >= *output_width && scaled_height >= *output_height) {
 965                 *output_width = scaled_width;
 966                 *output_height = scaled_height;
 967         }
 968 }
 969
 970 // Propagate input texture sizes throughout, and inform effects downstream.
 971 // (Like a lot of other code, we depend on effects being in topological order.)
 972 void EffectChain::inform_input_sizes(Phase *phase)
 973 {
 974         // All effects that have a defined size (inputs and RTT inputs)
 975         // get that. Reset all others.
 976         for (unsigned i = 0; i < phase->effects.size(); ++i) {
 977                 Node *node = phase->effects[i];
 978                 if (node->effect->num_inputs() == 0) {
 979                         Input *input = static_cast<Input *>(node->effect);
 980                         node->output_width = input->get_width();
 981                         node->output_height = input->get_height();
 982                         assert(node->output_width != 0);
 983                         assert(node->output_height != 0);
 984                 } else {
 985                         node->output_width = node->output_height = 0;
 986                 }
 987         }
 988         for (unsigned i = 0; i < phase->inputs.size(); ++i) {
 989                 Phase *input = phase->inputs[i];
 990                 input->output_node->output_width = input->virtual_output_width;
 991                 input->output_node->output_height = input->virtual_output_height;
 992                 assert(input->output_node->output_width != 0);
 993                 assert(input->output_node->output_height != 0);
 994         }
 995
 996         // Now propagate from the inputs towards the end, and inform as we go.
 997         // The rules are simple:
 998         //
 999         //   1. Don't touch effects that already have given sizes (ie., inputs
1000         //      or effects that change the output size).
1001         //   2. If all of your inputs have the same size, that will be your output size.
1002         //   3. Otherwise, your output size is 0x0.
1003         for (unsigned i = 0; i < phase->effects.size(); ++i) {
1004                 Node *node = phase->effects[i];
1005                 if (node->effect->num_inputs() == 0) {
1006                         continue;
1007                 }
1008                 unsigned this_output_width = 0;
1009                 unsigned this_output_height = 0;
1010                 for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
1011                         Node *input = node->incoming_links[j];
1012                         node->effect->inform_input_size(j, input->output_width, input->output_height);
1013                         if (j == 0) {
1014                                 this_output_width = input->output_width;
1015                                 this_output_height = input->output_height;
1016                         } else if (input->output_width != this_output_width || input->output_height != this_output_height) {
1017                                 // Inputs disagree.
1018                                 this_output_width = 0;
1019                                 this_output_height = 0;
1020                         }
1021                 }
1022                 if (node->effect->changes_output_size()) {
1023                         // We cannot call get_output_size() before we've done inform_input_size()
1024                         // on all inputs.
1025                         unsigned real_width, real_height;
1026                         node->effect->get_output_size(&real_width, &real_height,
1027                                                       &node->output_width, &node->output_height);
1028                         assert(node->effect->sets_virtual_output_size() ||
1029                                (real_width == node->output_width &&
1030                                 real_height == node->output_height));
1031                 } else {
1032                         node->output_width = this_output_width;
1033                         node->output_height = this_output_height;
1034                 }
1035         }
1036 }
1037
1038 // Note: You should call inform_input_sizes() before this, as the last effect's
1039 // desired output size might change based on the inputs.
1040 void EffectChain::find_output_size(Phase *phase)
1041 {
1042         Node *output_node = phase->effects.back();
1043
1044         // If the last effect explicitly sets an output size, use that.
1045         if (output_node->effect->changes_output_size()) {
1046                 output_node->effect->get_output_size(&phase->output_width, &phase->output_height,
1047                                                      &phase->virtual_output_width, &phase->virtual_output_height);
1048                 assert(output_node->effect->sets_virtual_output_size() ||
1049                        (phase->output_width == phase->virtual_output_width &&
1050                         phase->output_height == phase->virtual_output_height));
1051                 return;
1052         }
1053
1054         // If all effects have the same size, use that.
1055         unsigned output_width = 0, output_height = 0;
1056         bool all_inputs_same_size = true;
1057
1058         for (unsigned i = 0; i < phase->inputs.size(); ++i) {
1059                 Phase *input = phase->inputs[i];
1060                 assert(input->output_width != 0);
1061                 assert(input->output_height != 0);
1062                 if (output_width == 0 && output_height == 0) {
1063                         output_width = input->virtual_output_width;
1064                         output_height = input->virtual_output_height;
1065                 } else if (output_width != input->virtual_output_width ||
1066                            output_height != input->virtual_output_height) {
1067                         all_inputs_same_size = false;
1068                 }
1069         }
1070         for (unsigned i = 0; i < phase->effects.size(); ++i) {
1071                 Effect *effect = phase->effects[i]->effect;
1072                 if (effect->num_inputs() != 0) {
1073                         continue;
1074                 }
1075
1076                 Input *input = static_cast<Input *>(effect);
1077                 if (output_width == 0 && output_height == 0) {
1078                         output_width = input->get_width();
1079                         output_height = input->get_height();
1080                 } else if (output_width != input->get_width() ||
1081                            output_height != input->get_height()) {
1082                         all_inputs_same_size = false;
1083                 }
1084         }
1085
1086         if (all_inputs_same_size) {
1087                 assert(output_width != 0);
1088                 assert(output_height != 0);
1089                 phase->virtual_output_width = phase->output_width = output_width;
1090                 phase->virtual_output_height = phase->output_height = output_height;
1091                 return;
1092         }
1093
1094         // If not, fit all the inputs into the current aspect, and select the largest one.
1095         output_width = 0;
1096         output_height = 0;
1097         for (unsigned i = 0; i < phase->inputs.size(); ++i) {
1098                 Phase *input = phase->inputs[i];
1099                 assert(input->output_width != 0);
1100                 assert(input->output_height != 0);
1101                 size_rectangle_to_fit(input->output_width, input->output_height, &output_width, &output_height);
1102         }
1103         for (unsigned i = 0; i < phase->effects.size(); ++i) {
1104                 Effect *effect = phase->effects[i]->effect;
1105                 if (effect->num_inputs() != 0) {
1106                         continue;
1107                 }
1108
1109                 Input *input = static_cast<Input *>(effect);
1110                 size_rectangle_to_fit(input->get_width(), input->get_height(), &output_width, &output_height);
1111         }
1112         assert(output_width != 0);
1113         assert(output_height != 0);
1114         phase->virtual_output_width = phase->output_width = output_width;
1115         phase->virtual_output_height = phase->output_height = output_height;
1116 }
1117
1118 void EffectChain::sort_all_nodes_topologically()
1119 {
1120         nodes = topological_sort(nodes);
1121 }
1122
1123 vector<Node *> EffectChain::topological_sort(const vector<Node *> &nodes)
1124 {
1125         set<Node *> nodes_left_to_visit(nodes.begin(), nodes.end());
1126         vector<Node *> sorted_list;
1127         for (unsigned i = 0; i < nodes.size(); ++i) {
1128                 topological_sort_visit_node(nodes[i], &nodes_left_to_visit, &sorted_list);
1129         }
1130         reverse(sorted_list.begin(), sorted_list.end());
1131         return sorted_list;
1132 }
1133
1134 void EffectChain::topological_sort_visit_node(Node *node, set<Node *> *nodes_left_to_visit, vector<Node *> *sorted_list)
1135 {
1136         if (nodes_left_to_visit->count(node) == 0) {
1137                 return;
1138         }
1139         nodes_left_to_visit->erase(node);
1140         for (unsigned i = 0; i < node->outgoing_links.size(); ++i) {
1141                 topological_sort_visit_node(node->outgoing_links[i], nodes_left_to_visit, sorted_list);
1142         }
1143         sorted_list->push_back(node);
1144 }
1145
1146 void EffectChain::find_color_spaces_for_inputs()
1147 {
1148         for (unsigned i = 0; i < nodes.size(); ++i) {
1149                 Node *node = nodes[i];
1150                 if (node->disabled) {
1151                         continue;
1152                 }
1153                 if (node->incoming_links.size() == 0) {
1154                         Input *input = static_cast<Input *>(node->effect);
1155                         node->output_color_space = input->get_color_space();
1156                         node->output_gamma_curve = input->get_gamma_curve();
1157
1158                         Effect::AlphaHandling alpha_handling = input->alpha_handling();
1159                         switch (alpha_handling) {
1160                         case Effect::OUTPUT_BLANK_ALPHA:
1161                                 node->output_alpha_type = ALPHA_BLANK;
1162                                 break;
1163                         case Effect::INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA:
1164                                 node->output_alpha_type = ALPHA_PREMULTIPLIED;
1165                                 break;
1166                         case Effect::OUTPUT_POSTMULTIPLIED_ALPHA:
1167                                 node->output_alpha_type = ALPHA_POSTMULTIPLIED;
1168                                 break;
1169                         case Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK:
1170                         case Effect::DONT_CARE_ALPHA_TYPE:
1171                         default:
1172                                 assert(false);
1173                         }
1174
1175                         if (node->output_alpha_type == ALPHA_PREMULTIPLIED) {
1176                                 assert(node->output_gamma_curve == GAMMA_LINEAR);
1177                         }
1178                 }
1179         }
1180 }
1181
1182 // Propagate gamma and color space information as far as we can in the graph.
1183 // The rules are simple: Anything where all the inputs agree, get that as
1184 // output as well. Anything else keeps having *_INVALID.
1185 void EffectChain::propagate_gamma_and_color_space()
1186 {
1187         // We depend on going through the nodes in order.
1188         sort_all_nodes_topologically();
1189
1190         for (unsigned i = 0; i < nodes.size(); ++i) {
1191                 Node *node = nodes[i];
1192                 if (node->disabled) {
1193                         continue;
1194                 }
1195                 assert(node->incoming_links.size() == node->effect->num_inputs());
1196                 if (node->incoming_links.size() == 0) {
1197                         assert(node->output_color_space != COLORSPACE_INVALID);
1198                         assert(node->output_gamma_curve != GAMMA_INVALID);
1199                         continue;
1200                 }
1201
1202                 Colorspace color_space = node->incoming_links[0]->output_color_space;
1203                 GammaCurve gamma_curve = node->incoming_links[0]->output_gamma_curve;
1204                 for (unsigned j = 1; j < node->incoming_links.size(); ++j) {
1205                         if (node->incoming_links[j]->output_color_space != color_space) {
1206                                 color_space = COLORSPACE_INVALID;
1207                         }
1208                         if (node->incoming_links[j]->output_gamma_curve != gamma_curve) {
1209                                 gamma_curve = GAMMA_INVALID;
1210                         }
1211                 }
1212
1213                 // The conversion effects already have their outputs set correctly,
1214                 // so leave them alone.
1215                 if (node->effect->effect_type_id() != "ColorspaceConversionEffect") {
1216                         node->output_color_space = color_space;
1217                 }
1218                 if (node->effect->effect_type_id() != "GammaCompressionEffect" &&
1219                     node->effect->effect_type_id() != "GammaExpansionEffect") {
1220                         node->output_gamma_curve = gamma_curve;
1221                 }
1222         }
1223 }
1224
1225 // Propagate alpha information as far as we can in the graph.
1226 // Similar to propagate_gamma_and_color_space().
1227 void EffectChain::propagate_alpha()
1228 {
1229         // We depend on going through the nodes in order.
1230         sort_all_nodes_topologically();
1231
1232         for (unsigned i = 0; i < nodes.size(); ++i) {
1233                 Node *node = nodes[i];
1234                 if (node->disabled) {
1235                         continue;
1236                 }
1237                 assert(node->incoming_links.size() == node->effect->num_inputs());
1238                 if (node->incoming_links.size() == 0) {
1239                         assert(node->output_alpha_type != ALPHA_INVALID);
1240                         continue;
1241                 }
1242
1243                 // The alpha multiplication/division effects are special cases.
1244                 if (node->effect->effect_type_id() == "AlphaMultiplicationEffect") {
1245                         assert(node->incoming_links.size() == 1);
1246                         assert(node->incoming_links[0]->output_alpha_type == ALPHA_POSTMULTIPLIED);
1247                         node->output_alpha_type = ALPHA_PREMULTIPLIED;
1248                         continue;
1249                 }
1250                 if (node->effect->effect_type_id() == "AlphaDivisionEffect") {
1251                         assert(node->incoming_links.size() == 1);
1252                         assert(node->incoming_links[0]->output_alpha_type == ALPHA_PREMULTIPLIED);
1253                         node->output_alpha_type = ALPHA_POSTMULTIPLIED;
1254                         continue;
1255                 }
1256
1257                 // GammaCompressionEffect and GammaExpansionEffect are also a special case,
1258                 // because they are the only one that _need_ postmultiplied alpha.
1259                 if (node->effect->effect_type_id() == "GammaCompressionEffect" ||
1260                     node->effect->effect_type_id() == "GammaExpansionEffect") {
1261                         assert(node->incoming_links.size() == 1);
1262                         if (node->incoming_links[0]->output_alpha_type == ALPHA_BLANK) {
1263                                 node->output_alpha_type = ALPHA_BLANK;
1264                         } else if (node->incoming_links[0]->output_alpha_type == ALPHA_POSTMULTIPLIED) {
1265                                 node->output_alpha_type = ALPHA_POSTMULTIPLIED;
1266                         } else {
1267                                 node->output_alpha_type = ALPHA_INVALID;
1268                         }
1269                         continue;
1270                 }
1271
1272                 // Only inputs can have unconditional alpha output (OUTPUT_BLANK_ALPHA
1273                 // or OUTPUT_POSTMULTIPLIED_ALPHA), and they have already been
1274                 // taken care of above. Rationale: Even if you could imagine
1275                 // e.g. an effect that took in an image and set alpha=1.0
1276                 // unconditionally, it wouldn't make any sense to have it as
1277                 // e.g. OUTPUT_BLANK_ALPHA, since it wouldn't know whether it
1278                 // got its input pre- or postmultiplied, so it wouldn't know
1279                 // whether to divide away the old alpha or not.
1280                 Effect::AlphaHandling alpha_handling = node->effect->alpha_handling();
1281                 assert(alpha_handling == Effect::INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA ||
1282                        alpha_handling == Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK ||
1283                        alpha_handling == Effect::DONT_CARE_ALPHA_TYPE);
1284
1285                 // If the node has multiple inputs, check that they are all valid and
1286                 // the same.
1287                 bool any_invalid = false;
1288                 bool any_premultiplied = false;
1289                 bool any_postmultiplied = false;
1290
1291                 for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
1292                         switch (node->incoming_links[j]->output_alpha_type) {
1293                         case ALPHA_INVALID:
1294                                 any_invalid = true;
1295                                 break;
1296                         case ALPHA_BLANK:
1297                                 // Blank is good as both pre- and postmultiplied alpha,
1298                                 // so just ignore it.
1299                                 break;
1300                         case ALPHA_PREMULTIPLIED:
1301                                 any_premultiplied = true;
1302                                 break;
1303                         case ALPHA_POSTMULTIPLIED:
1304                                 any_postmultiplied = true;
1305                                 break;
1306                         default:
1307                                 assert(false);
1308                         }
1309                 }
1310
1311                 if (any_invalid) {
1312                         node->output_alpha_type = ALPHA_INVALID;
1313                         continue;
1314                 }
1315
1316                 // Inputs must be of the same type.
1317                 if (any_premultiplied && any_postmultiplied) {
1318                         node->output_alpha_type = ALPHA_INVALID;
1319                         continue;
1320                 }
1321
1322                 if (alpha_handling == Effect::INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA ||
1323                     alpha_handling == Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK) {
1324                         // This combination (requiring premultiplied alpha, but _not_ requiring
1325                         // linear light) is illegal, since the combination of premultiplied alpha
1326                         // and nonlinear inputs is meaningless.
1327                         assert(node->effect->needs_linear_light());
1328
1329                         // If the effect has asked for premultiplied alpha, check that it has got it.
1330                         if (any_postmultiplied) {
1331                                 node->output_alpha_type = ALPHA_INVALID;
1332                         } else if (!any_premultiplied &&
1333                                    alpha_handling == Effect::INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK) {
1334                                 // Blank input alpha, and the effect preserves blank alpha.
1335                                 node->output_alpha_type = ALPHA_BLANK;
1336                         } else {
1337                                 node->output_alpha_type = ALPHA_PREMULTIPLIED;
1338                         }
1339                 } else {
1340                         // OK, all inputs are the same, and this effect is not going
1341                         // to change it.
1342                         assert(alpha_handling == Effect::DONT_CARE_ALPHA_TYPE);
1343                         if (any_premultiplied) {
1344                                 node->output_alpha_type = ALPHA_PREMULTIPLIED;
1345                         } else if (any_postmultiplied) {
1346                                 node->output_alpha_type = ALPHA_POSTMULTIPLIED;
1347                         } else {
1348                                 node->output_alpha_type = ALPHA_BLANK;
1349                         }
1350                 }
1351         }
1352 }
1353
1354 bool EffectChain::node_needs_colorspace_fix(Node *node)
1355 {
1356         if (node->disabled) {
1357                 return false;
1358         }
1359         if (node->effect->num_inputs() == 0) {
1360                 return false;
1361         }
1362
1363         // propagate_gamma_and_color_space() has already set our output
1364         // to COLORSPACE_INVALID if the inputs differ, so we can rely on that.
1365         if (node->output_color_space == COLORSPACE_INVALID) {
1366                 return true;
1367         }
1368         return (node->effect->needs_srgb_primaries() && node->output_color_space != COLORSPACE_sRGB);
1369 }
1370
1371 // Fix up color spaces so that there are no COLORSPACE_INVALID nodes left in
1372 // the graph. Our strategy is not always optimal, but quite simple:
1373 // Find an effect that's as early as possible where the inputs are of
1374 // unacceptable colorspaces (that is, either different, or, if the effect only
1375 // wants sRGB, not sRGB.) Add appropriate conversions on all its inputs,
1376 // propagate the information anew, and repeat until there are no more such
1377 // effects.
1378 void EffectChain::fix_internal_color_spaces()
1379 {
1380         unsigned colorspace_propagation_pass = 0;
1381         bool found_any;
1382         do {
1383                 found_any = false;
1384                 for (unsigned i = 0; i < nodes.size(); ++i) {
1385                         Node *node = nodes[i];
1386                         if (!node_needs_colorspace_fix(node)) {
1387                                 continue;
1388                         }
1389
1390                         // Go through each input that is not sRGB, and insert
1391                         // a colorspace conversion after it.
1392                         for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
1393                                 Node *input = node->incoming_links[j];
1394                                 assert(input->output_color_space != COLORSPACE_INVALID);
1395                                 if (input->output_color_space == COLORSPACE_sRGB) {
1396                                         continue;
1397                                 }
1398                                 Node *conversion = add_node(new ColorspaceConversionEffect());
1399                                 CHECK(conversion->effect->set_int("source_space", input->output_color_space));
1400                                 CHECK(conversion->effect->set_int("destination_space", COLORSPACE_sRGB));
1401                                 conversion->output_color_space = COLORSPACE_sRGB;
1402                                 replace_sender(input, conversion);
1403                                 connect_nodes(input, conversion);
1404                         }
1405
1406                         // Re-sort topologically, and propagate the new information.
1407                         propagate_gamma_and_color_space();
1408
1409                         found_any = true;
1410                         break;
1411                 }
1412
1413                 char filename[256];
1414                 sprintf(filename, "step5-colorspacefix-iter%u.dot", ++colorspace_propagation_pass);
1415                 output_dot(filename);
1416                 assert(colorspace_propagation_pass < 100);
1417         } while (found_any);
1418
1419         for (unsigned i = 0; i < nodes.size(); ++i) {
1420                 Node *node = nodes[i];
1421                 if (node->disabled) {
1422                         continue;
1423                 }
1424                 assert(node->output_color_space != COLORSPACE_INVALID);
1425         }
1426 }
1427
1428 bool EffectChain::node_needs_alpha_fix(Node *node)
1429 {
1430         if (node->disabled) {
1431                 return false;
1432         }
1433
1434         // propagate_alpha() has already set our output to ALPHA_INVALID if the
1435         // inputs differ or we are otherwise in mismatch, so we can rely on that.
1436         return (node->output_alpha_type == ALPHA_INVALID);
1437 }
1438
1439 // Fix up alpha so that there are no ALPHA_INVALID nodes left in
1440 // the graph. Similar to fix_internal_color_spaces().
1441 void EffectChain::fix_internal_alpha(unsigned step)
1442 {
1443         unsigned alpha_propagation_pass = 0;
1444         bool found_any;
1445         do {
1446                 found_any = false;
1447                 for (unsigned i = 0; i < nodes.size(); ++i) {
1448                         Node *node = nodes[i];
1449                         if (!node_needs_alpha_fix(node)) {
1450                                 continue;
1451                         }
1452
1453                         // If we need to fix up GammaExpansionEffect, then clearly something
1454                         // is wrong, since the combination of premultiplied alpha and nonlinear inputs
1455                         // is meaningless.
1456                         assert(node->effect->effect_type_id() != "GammaExpansionEffect");
1457
1458                         AlphaType desired_type = ALPHA_PREMULTIPLIED;
1459
1460                         // GammaCompressionEffect is special; it needs postmultiplied alpha.
1461                         if (node->effect->effect_type_id() == "GammaCompressionEffect") {
1462                                 assert(node->incoming_links.size() == 1);
1463                                 assert(node->incoming_links[0]->output_alpha_type == ALPHA_PREMULTIPLIED);
1464                                 desired_type = ALPHA_POSTMULTIPLIED;
1465                         }
1466
1467                         // Go through each input that is not premultiplied alpha, and insert
1468                         // a conversion before it.
1469                         for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
1470                                 Node *input = node->incoming_links[j];
1471                                 assert(input->output_alpha_type != ALPHA_INVALID);
1472                                 if (input->output_alpha_type == desired_type ||
1473                                     input->output_alpha_type == ALPHA_BLANK) {
1474                                         continue;
1475                                 }
1476                                 Node *conversion;
1477                                 if (desired_type == ALPHA_PREMULTIPLIED) {
1478                                         conversion = add_node(new AlphaMultiplicationEffect());
1479                                 } else {
1480                                         conversion = add_node(new AlphaDivisionEffect());
1481                                 }
1482                                 conversion->output_alpha_type = desired_type;
1483                                 replace_sender(input, conversion);
1484                                 connect_nodes(input, conversion);
1485                         }
1486
1487                         // Re-sort topologically, and propagate the new information.
1488                         propagate_gamma_and_color_space();
1489                         propagate_alpha();
1490
1491                         found_any = true;
1492                         break;
1493                 }
1494
1495                 char filename[256];
1496                 sprintf(filename, "step%u-alphafix-iter%u.dot", step, ++alpha_propagation_pass);
1497                 output_dot(filename);
1498                 assert(alpha_propagation_pass < 100);
1499         } while (found_any);
1500
1501         for (unsigned i = 0; i < nodes.size(); ++i) {
1502                 Node *node = nodes[i];
1503                 if (node->disabled) {
1504                         continue;
1505                 }
1506                 assert(node->output_alpha_type != ALPHA_INVALID);
1507         }
1508 }
1509
1510 // Make so that the output is in the desired color space.
1511 void EffectChain::fix_output_color_space()
1512 {
1513         Node *output = find_output_node();
1514         if (output->output_color_space != output_format.color_space) {
1515                 Node *conversion = add_node(new ColorspaceConversionEffect());
1516                 CHECK(conversion->effect->set_int("source_space", output->output_color_space));
1517                 CHECK(conversion->effect->set_int("destination_space", output_format.color_space));
1518                 conversion->output_color_space = output_format.color_space;
1519                 connect_nodes(output, conversion);
1520                 propagate_alpha();
1521                 propagate_gamma_and_color_space();
1522         }
1523 }
1524
1525 // Make so that the output is in the desired pre-/postmultiplication alpha state.
1526 void EffectChain::fix_output_alpha()
1527 {
1528         Node *output = find_output_node();
1529         assert(output->output_alpha_type != ALPHA_INVALID);
1530         if (output->output_alpha_type == ALPHA_BLANK) {
1531                 // No alpha output, so we don't care.
1532                 return;
1533         }
1534         if (output->output_alpha_type == ALPHA_PREMULTIPLIED &&
1535             output_alpha_format == OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED) {
1536                 Node *conversion = add_node(new AlphaDivisionEffect());
1537                 connect_nodes(output, conversion);
1538                 propagate_alpha();
1539                 propagate_gamma_and_color_space();
1540         }
1541         if (output->output_alpha_type == ALPHA_POSTMULTIPLIED &&
1542             output_alpha_format == OUTPUT_ALPHA_FORMAT_PREMULTIPLIED) {
1543                 Node *conversion = add_node(new AlphaMultiplicationEffect());
1544                 connect_nodes(output, conversion);
1545                 propagate_alpha();
1546                 propagate_gamma_and_color_space();
1547         }
1548 }
1549
1550 bool EffectChain::node_needs_gamma_fix(Node *node)
1551 {
1552         if (node->disabled) {
1553                 return false;
1554         }
1555
1556         // Small hack since the output is not an explicit node:
1557         // If we are the last node and our output is in the wrong
1558         // space compared to EffectChain's output, we need to fix it.
1559         // This will only take us to linear, but fix_output_gamma()
1560         // will come and take us to the desired output gamma
1561         // if it is needed.
1562         //
1563         // This needs to be before everything else, since it could
1564         // even apply to inputs (if they are the only effect).
1565         if (node->outgoing_links.empty() &&
1566             node->output_gamma_curve != output_format.gamma_curve &&
1567             node->output_gamma_curve != GAMMA_LINEAR) {
1568                 return true;
1569         }
1570
1571         if (node->effect->num_inputs() == 0) {
1572                 return false;
1573         }
1574
1575         // propagate_gamma_and_color_space() has already set our output
1576         // to GAMMA_INVALID if the inputs differ, so we can rely on that,
1577         // except for GammaCompressionEffect.
1578         if (node->output_gamma_curve == GAMMA_INVALID) {
1579                 return true;
1580         }
1581         if (node->effect->effect_type_id() == "GammaCompressionEffect") {
1582                 assert(node->incoming_links.size() == 1);
1583                 return node->incoming_links[0]->output_gamma_curve != GAMMA_LINEAR;
1584         }
1585
1586         return (node->effect->needs_linear_light() && node->output_gamma_curve != GAMMA_LINEAR);
1587 }
1588
1589 // Very similar to fix_internal_color_spaces(), but for gamma.
1590 // There is one difference, though; before we start adding conversion nodes,
1591 // we see if we can get anything out of asking the sources to deliver
1592 // linear gamma directly. fix_internal_gamma_by_asking_inputs()
1593 // does that part, while fix_internal_gamma_by_inserting_nodes()
1594 // inserts nodes as needed afterwards.
1595 void EffectChain::fix_internal_gamma_by_asking_inputs(unsigned step)
1596 {
1597         unsigned gamma_propagation_pass = 0;
1598         bool found_any;
1599         do {
1600                 found_any = false;
1601                 for (unsigned i = 0; i < nodes.size(); ++i) {
1602                         Node *node = nodes[i];
1603                         if (!node_needs_gamma_fix(node)) {
1604                                 continue;
1605                         }
1606
1607                         // See if all inputs can give us linear gamma. If not, leave it.
1608                         vector<Node *> nonlinear_inputs;
1609                         find_all_nonlinear_inputs(node, &nonlinear_inputs);
1610                         assert(!nonlinear_inputs.empty());
1611
1612                         bool all_ok = true;
1613                         for (unsigned i = 0; i < nonlinear_inputs.size(); ++i) {
1614                                 Input *input = static_cast<Input *>(nonlinear_inputs[i]->effect);
1615                                 all_ok &= input->can_output_linear_gamma();
1616                         }
1617
1618                         if (!all_ok) {
1619                                 continue;
1620                         }
1621
1622                         for (unsigned i = 0; i < nonlinear_inputs.size(); ++i) {
1623                                 CHECK(nonlinear_inputs[i]->effect->set_int("output_linear_gamma", 1));
1624                                 nonlinear_inputs[i]->output_gamma_curve = GAMMA_LINEAR;
1625                         }
1626
1627                         // Re-sort topologically, and propagate the new information.
1628                         propagate_gamma_and_color_space();
1629
1630                         found_any = true;
1631                         break;
1632                 }
1633
1634                 char filename[256];
1635                 sprintf(filename, "step%u-gammafix-iter%u.dot", step, ++gamma_propagation_pass);
1636                 output_dot(filename);
1637                 assert(gamma_propagation_pass < 100);
1638         } while (found_any);
1639 }
1640
1641 void EffectChain::fix_internal_gamma_by_inserting_nodes(unsigned step)
1642 {
1643         unsigned gamma_propagation_pass = 0;
1644         bool found_any;
1645         do {
1646                 found_any = false;
1647                 for (unsigned i = 0; i < nodes.size(); ++i) {
1648                         Node *node = nodes[i];
1649                         if (!node_needs_gamma_fix(node)) {
1650                                 continue;
1651                         }
1652
1653                         // Special case: We could be an input and still be asked to
1654                         // fix our gamma; if so, we should be the only node
1655                         // (as node_needs_gamma_fix() would only return true in
1656                         // for an input in that case). That means we should insert
1657                         // a conversion node _after_ ourselves.
1658                         if (node->incoming_links.empty()) {
1659                                 assert(node->outgoing_links.empty());
1660                                 Node *conversion = add_node(new GammaExpansionEffect());
1661                                 CHECK(conversion->effect->set_int("source_curve", node->output_gamma_curve));
1662                                 conversion->output_gamma_curve = GAMMA_LINEAR;
1663                                 connect_nodes(node, conversion);
1664                         }
1665
1666                         // If not, go through each input that is not linear gamma,
1667                         // and insert a gamma conversion after it.
1668                         for (unsigned j = 0; j < node->incoming_links.size(); ++j) {
1669                                 Node *input = node->incoming_links[j];
1670                                 assert(input->output_gamma_curve != GAMMA_INVALID);
1671                                 if (input->output_gamma_curve == GAMMA_LINEAR) {
1672                                         continue;
1673                                 }
1674                                 Node *conversion = add_node(new GammaExpansionEffect());
1675                                 CHECK(conversion->effect->set_int("source_curve", input->output_gamma_curve));
1676                                 conversion->output_gamma_curve = GAMMA_LINEAR;
1677                                 replace_sender(input, conversion);
1678                                 connect_nodes(input, conversion);
1679                         }
1680
1681                         // Re-sort topologically, and propagate the new information.
1682                         propagate_alpha();
1683                         propagate_gamma_and_color_space();
1684
1685                         found_any = true;
1686                         break;
1687                 }
1688
1689                 char filename[256];
1690                 sprintf(filename, "step%u-gammafix-iter%u.dot", step, ++gamma_propagation_pass);
1691                 output_dot(filename);
1692                 assert(gamma_propagation_pass < 100);
1693         } while (found_any);
1694
1695         for (unsigned i = 0; i < nodes.size(); ++i) {
1696                 Node *node = nodes[i];
1697                 if (node->disabled) {
1698                         continue;
1699                 }
1700                 assert(node->output_gamma_curve != GAMMA_INVALID);
1701         }
1702 }
1703
1704 // Make so that the output is in the desired gamma.
1705 // Note that this assumes linear input gamma, so it might create the need
1706 // for another pass of fix_internal_gamma().
1707 void EffectChain::fix_output_gamma()
1708 {
1709         Node *output = find_output_node();
1710         if (output->output_gamma_curve != output_format.gamma_curve) {
1711                 Node *conversion = add_node(new GammaCompressionEffect());
1712                 CHECK(conversion->effect->set_int("destination_curve", output_format.gamma_curve));
1713                 conversion->output_gamma_curve = output_format.gamma_curve;
1714                 connect_nodes(output, conversion);
1715         }
1716 }
1717
1718 // If the user has requested Y'CbCr output, we need to do this conversion
1719 // _after_ GammaCompressionEffect etc., but before dither (see below).
1720 // This is because Y'CbCr, with the exception of a special optional mode
1721 // in Rec. 2020 (which we currently don't support), is defined to work on
1722 // gamma-encoded data.
1723 void EffectChain::add_ycbcr_conversion_if_needed()
1724 {
1725         assert(output_color_rgba || num_output_color_ycbcr > 0);
1726         if (num_output_color_ycbcr == 0) {
1727                 return;
1728         }
1729         Node *output = find_output_node();
1730         ycbcr_conversion_effect_node = add_node(new YCbCrConversionEffect(output_ycbcr_format, output_ycbcr_type));
1731         connect_nodes(output, ycbcr_conversion_effect_node);
1732 }
1733
1734 // If the user has requested dither, add a DitherEffect right at the end
1735 // (after GammaCompressionEffect etc.). This needs to be done after everything else,
1736 // since dither is about the only effect that can _not_ be done in linear space.
1737 void EffectChain::add_dither_if_needed()
1738 {
1739         if (num_dither_bits == 0) {
1740                 return;
1741         }
1742         Node *output = find_output_node();
1743         Node *dither = add_node(new DitherEffect());
1744         CHECK(dither->effect->set_int("num_bits", num_dither_bits));
1745         connect_nodes(output, dither);
1746
1747         dither_effect = dither->effect;
1748 }
1749
1750 // Compute shaders can't output to the framebuffer, so if the last
1751 // phase ends in a compute shader, add a dummy phase at the end that
1752 // only blits directly from the temporary texture.
1753 //
1754 // TODO: Add an API for rendering directly to textures, for the cases
1755 // where we're only rendering to an FBO anyway.
1756 void EffectChain::add_dummy_effect_if_needed()
1757 {
1758         Node *output = find_output_node();
1759
1760         // See if the last effect that's not strong one-to-one is a compute shader.
1761         Node *last_effect = output;
1762         while (last_effect->effect->num_inputs() == 1 &&
1763                last_effect->effect->strong_one_to_one_sampling()) {
1764                 last_effect = last_effect->incoming_links[0];
1765         }
1766         if (last_effect->effect->is_compute_shader()) {
1767                 Node *dummy = add_node(new ComputeShaderOutputDisplayEffect());
1768                 connect_nodes(output, dummy);
1769                 has_dummy_effect = true;
1770         }
1771 }
1772
1773 // Find the output node. This is, simply, one that has no outgoing links.
1774 // If there are multiple ones, the graph is malformed (we do not support
1775 // multiple outputs right now).
1776 Node *EffectChain::find_output_node()
1777 {
1778         vector<Node *> output_nodes;
1779         for (unsigned i = 0; i < nodes.size(); ++i) {
1780                 Node *node = nodes[i];
1781                 if (node->disabled) {
1782                         continue;
1783                 }
1784                 if (node->outgoing_links.empty()) {
1785                         output_nodes.push_back(node);
1786                 }
1787         }
1788         assert(output_nodes.size() == 1);
1789         return output_nodes[0];
1790 }
1791
1792 void EffectChain::finalize()
1793 {
1794         // Output the graph as it is before we do any conversions on it.
1795         output_dot("step0-start.dot");
1796
1797         // Give each effect in turn a chance to rewrite its own part of the graph.
1798         // Note that if more effects are added as part of this, they will be
1799         // picked up as part of the same for loop, since they are added at the end.
1800         for (unsigned i = 0; i < nodes.size(); ++i) {
1801                 nodes[i]->effect->rewrite_graph(this, nodes[i]);
1802         }
1803         output_dot("step1-rewritten.dot");
1804
1805         find_color_spaces_for_inputs();
1806         output_dot("step2-input-colorspace.dot");
1807
1808         propagate_alpha();
1809         output_dot("step3-propagated-alpha.dot");
1810
1811         propagate_gamma_and_color_space();
1812         output_dot("step4-propagated-all.dot");
1813
1814         fix_internal_color_spaces();
1815         fix_internal_alpha(6);
1816         fix_output_color_space();
1817         output_dot("step7-output-colorspacefix.dot");
1818         fix_output_alpha();
1819         output_dot("step8-output-alphafix.dot");
1820
1821         // Note that we need to fix gamma after colorspace conversion,
1822         // because colorspace conversions might create needs for gamma conversions.
1823         // Also, we need to run an extra pass of fix_internal_gamma() after
1824         // fixing the output gamma, as we only have conversions to/from linear,
1825         // and fix_internal_alpha() since GammaCompressionEffect needs
1826         // postmultiplied input.
1827         fix_internal_gamma_by_asking_inputs(9);
1828         fix_internal_gamma_by_inserting_nodes(10);
1829         fix_output_gamma();
1830         output_dot("step11-output-gammafix.dot");
1831         propagate_alpha();
1832         output_dot("step12-output-alpha-propagated.dot");
1833         fix_internal_alpha(13);
1834         output_dot("step14-output-alpha-fixed.dot");
1835         fix_internal_gamma_by_asking_inputs(15);
1836         fix_internal_gamma_by_inserting_nodes(16);
1837
1838         output_dot("step17-before-ycbcr.dot");
1839         add_ycbcr_conversion_if_needed();
1840
1841         output_dot("step18-before-dither.dot");
1842         add_dither_if_needed();
1843
1844         output_dot("step19-before-dummy-effect.dot");
1845         add_dummy_effect_if_needed();
1846
1847         output_dot("step20-final.dot");
1848
1849         // Construct all needed GLSL programs, starting at the output.
1850         // We need to keep track of which effects have already been computed,
1851         // as an effect with multiple users could otherwise be calculated
1852         // multiple times.
1853         map<Node *, Phase *> completed_effects;
1854         construct_phase(find_output_node(), &completed_effects);
1855
1856         output_dot("step21-split-to-phases.dot");
1857
1858         assert(phases[0]->inputs.empty());
1859
1860         finalized = true;
1861 }
1862
1863 void EffectChain::render_to_fbo(GLuint dest_fbo, unsigned width, unsigned height)
1864 {
1865         // Save original viewport.
1866         GLuint x = 0, y = 0;
1867
1868         if (width == 0 && height == 0) {
1869                 GLint viewport[4];
1870                 glGetIntegerv(GL_VIEWPORT, viewport);
1871                 x = viewport[0];
1872                 y = viewport[1];
1873                 width = viewport[2];
1874                 height = viewport[3];
1875         }
1876
1877         render(dest_fbo, {}, x, y, width, height);
1878 }
1879
1880 void EffectChain::render_to_texture(const vector<DestinationTexture> &destinations, unsigned width, unsigned height)
1881 {
1882         assert(finalized);
1883         assert(!destinations.empty());
1884
1885         if (!has_dummy_effect) {
1886                 // We don't end in a compute shader, so there's nothing specific for us to do.
1887                 // Create an FBO for this set of textures, and just render to that.
1888                 GLuint texnums[4] = { 0, 0, 0, 0 };
1889                 for (unsigned i = 0; i < destinations.size() && i < 4; ++i) {
1890                         texnums[i] = destinations[i].texnum;
1891                 }
1892                 GLuint dest_fbo = resource_pool->create_fbo(texnums[0], texnums[1], texnums[2], texnums[3]);
1893                 render(dest_fbo, {}, 0, 0, width, height);
1894                 resource_pool->release_fbo(dest_fbo);
1895         } else {
1896                 render((GLuint)-1, destinations, 0, 0, width, height);
1897         }
1898 }
1899
1900 void EffectChain::render(GLuint dest_fbo, const vector<DestinationTexture> &destinations, unsigned x, unsigned y, unsigned width, unsigned height)
1901 {
1902         assert(finalized);
1903         assert(destinations.size() <= 1);
1904
1905         // This needs to be set anew, in case we are coming from a different context
1906         // from when we initialized.
1907         check_error();
1908         glDisable(GL_DITHER);
1909         check_error();
1910
1911         const bool final_srgb = glIsEnabled(GL_FRAMEBUFFER_SRGB);
1912         check_error();
1913         bool current_srgb = final_srgb;
1914
1915         // Basic state.
1916         check_error();
1917         glDisable(GL_BLEND);
1918         check_error();
1919         glDisable(GL_DEPTH_TEST);
1920         check_error();
1921         glDepthMask(GL_FALSE);
1922         check_error();
1923
1924         set<Phase *> generated_mipmaps;
1925
1926         // We keep one texture per output, but only for as long as we actually have any
1927         // phases that need it as an input. (We don't make any effort to reorder phases
1928         // to minimize the number of textures in play, as register allocation can be
1929         // complicated and we rarely have much to gain, since our graphs are typically
1930         // pretty linear.)
1931         map<Phase *, GLuint> output_textures;
1932         map<Phase *, int> ref_counts;
1933         for (Phase *phase : phases) {
1934                 for (Phase *input : phase->inputs) {
1935                         ++ref_counts[input];
1936                 }
1937         }
1938
1939         size_t num_phases = phases.size();
1940         if (destinations.empty()) {
1941                 assert(dest_fbo != (GLuint)-1);
1942         } else {
1943                 assert(has_dummy_effect);
1944                 assert(x == 0);
1945                 assert(y == 0);
1946                 assert(num_phases >= 2);
1947                 assert(!phases.back()->is_compute_shader);
1948                 assert(phases.back()->effects.size() == 1);
1949                 assert(phases.back()->effects[0]->effect->effect_type_id() == "ComputeShaderOutputDisplayEffect");
1950
1951                 // We are rendering to a set of textures, so we can run the compute shader
1952                 // directly and skip the dummy phase.
1953                 --num_phases;
1954         }
1955
1956         for (unsigned phase_num = 0; phase_num < num_phases; ++phase_num) {
1957                 Phase *phase = phases[phase_num];
1958
1959                 if (do_phase_timing) {
1960                         GLuint timer_query_object;
1961                         if (phase->timer_query_objects_free.empty()) {
1962                                 glGenQueries(1, &timer_query_object);
1963                         } else {
1964                                 timer_query_object = phase->timer_query_objects_free.front();
1965                                 phase->timer_query_objects_free.pop_front();
1966                         }
1967                         glBeginQuery(GL_TIME_ELAPSED, timer_query_object);
1968                         phase->timer_query_objects_running.push_back(timer_query_object);
1969                 }
1970                 bool last_phase = (phase_num == num_phases - 1);
1971                 if (phase_num == num_phases - 1) {
1972                         // Last phase goes to the output the user specified.
1973                         if (!phase->is_compute_shader) {
1974                                 glBindFramebuffer(GL_FRAMEBUFFER, dest_fbo);
1975                                 check_error();
1976                                 GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
1977                                 assert(status == GL_FRAMEBUFFER_COMPLETE);
1978                                 glViewport(x, y, width, height);
1979                         }
1980                         if (dither_effect != nullptr) {
1981                                 CHECK(dither_effect->set_int("output_width", width));
1982                                 CHECK(dither_effect->set_int("output_height", height));
1983                         }
1984                 }
1985
1986                 // Enable sRGB rendering for intermediates in case we are
1987                 // rendering to an sRGB format.
1988                 // TODO: Support this for compute shaders.
1989                 bool needs_srgb = last_phase ? final_srgb : true;
1990                 if (needs_srgb && !current_srgb) {
1991                         glEnable(GL_FRAMEBUFFER_SRGB);
1992                         check_error();
1993                         current_srgb = true;
1994                 } else if (!needs_srgb && current_srgb) {
1995                         glDisable(GL_FRAMEBUFFER_SRGB);
1996                         check_error();
1997                         current_srgb = true;
1998                 }
1999
2000                 // Find a texture for this phase.
2001                 inform_input_sizes(phase);
2002                 find_output_size(phase);
2003                 vector<DestinationTexture> phase_destinations;
2004                 if (!last_phase) {
2005                         GLuint tex_num = resource_pool->create_2d_texture(intermediate_format, phase->output_width, phase->output_height);
2006                         output_textures.insert(make_pair(phase, tex_num));
2007                         phase_destinations.push_back(DestinationTexture{ tex_num, intermediate_format });
2008
2009                         // The output texture needs to have valid state to be written to by a compute shader.
2010                         glActiveTexture(GL_TEXTURE0);
2011                         check_error();
2012                         glBindTexture(GL_TEXTURE_2D, tex_num);
2013                         check_error();
2014                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
2015                         check_error();
2016                 } else if (phase->is_compute_shader) {
2017                         assert(!destinations.empty());
2018                         phase_destinations = destinations;
2019                 }
2020
2021                 execute_phase(phase, output_textures, phase_destinations, &generated_mipmaps);
2022                 if (do_phase_timing) {
2023                         glEndQuery(GL_TIME_ELAPSED);
2024                 }
2025
2026                 // Drop any input textures we don't need anymore.
2027                 for (Phase *input : phase->inputs) {
2028                         assert(ref_counts[input] > 0);
2029                         if (--ref_counts[input] == 0) {
2030                                 resource_pool->release_2d_texture(output_textures[input]);
2031                                 output_textures.erase(input);
2032                         }
2033                 }
2034         }
2035
2036         for (const auto &phase_and_texnum : output_textures) {
2037                 resource_pool->release_2d_texture(phase_and_texnum.second);
2038         }
2039
2040         glBindFramebuffer(GL_FRAMEBUFFER, 0);
2041         check_error();
2042         glUseProgram(0);
2043         check_error();
2044
2045         glBindBuffer(GL_ARRAY_BUFFER, 0);
2046         check_error();
2047         glBindVertexArray(0);
2048         check_error();
2049
2050         if (do_phase_timing) {
2051                 // Get back the timer queries.
2052                 for (unsigned phase_num = 0; phase_num < phases.size(); ++phase_num) {
2053                         Phase *phase = phases[phase_num];
2054                         for (auto timer_it = phase->timer_query_objects_running.cbegin();
2055                              timer_it != phase->timer_query_objects_running.cend(); ) {
2056                                 GLint timer_query_object = *timer_it;
2057                                 GLint available;
2058                                 glGetQueryObjectiv(timer_query_object, GL_QUERY_RESULT_AVAILABLE, &available);
2059                                 if (available) {
2060                                         GLuint64 time_elapsed;
2061                                         glGetQueryObjectui64v(timer_query_object, GL_QUERY_RESULT, &time_elapsed);
2062                                         phase->time_elapsed_ns += time_elapsed;
2063                                         ++phase->num_measured_iterations;
2064                                         phase->timer_query_objects_free.push_back(timer_query_object);
2065                                         phase->timer_query_objects_running.erase(timer_it++);
2066                                 } else {
2067                                         ++timer_it;
2068                                 }
2069                         }
2070                 }
2071         }
2072 }
2073
2074 void EffectChain::enable_phase_timing(bool enable)
2075 {
2076         if (enable) {
2077                 assert(movit_timer_queries_supported);
2078         }
2079         this->do_phase_timing = enable;
2080 }
2081
2082 void EffectChain::reset_phase_timing()
2083 {
2084         for (unsigned phase_num = 0; phase_num < phases.size(); ++phase_num) {
2085                 Phase *phase = phases[phase_num];
2086                 phase->time_elapsed_ns = 0;
2087                 phase->num_measured_iterations = 0;
2088         }
2089 }
2090
2091 void EffectChain::print_phase_timing()
2092 {
2093         double total_time_ms = 0.0;
2094         for (unsigned phase_num = 0; phase_num < phases.size(); ++phase_num) {
2095                 Phase *phase = phases[phase_num];
2096                 double avg_time_ms = phase->time_elapsed_ns * 1e-6 / phase->num_measured_iterations;
2097                 printf("Phase %d: %5.1f ms  [", phase_num, avg_time_ms);
2098                 for (unsigned effect_num = 0; effect_num < phase->effects.size(); ++effect_num) {
2099                         if (effect_num != 0) {
2100                                 printf(", ");
2101                         }
2102                         printf("%s", phase->effects[effect_num]->effect->effect_type_id().c_str());
2103                 }
2104                 printf("]\n");
2105                 total_time_ms += avg_time_ms;
2106         }
2107         printf("Total:   %5.1f ms\n", total_time_ms);
2108 }
2109
2110 void EffectChain::execute_phase(Phase *phase,
2111                                 const map<Phase *, GLuint> &output_textures,
2112                                 const std::vector<DestinationTexture> &destinations,
2113                                 set<Phase *> *generated_mipmaps)
2114 {
2115         // Set up RTT inputs for this phase.
2116         for (unsigned sampler = 0; sampler < phase->inputs.size(); ++sampler) {
2117                 glActiveTexture(GL_TEXTURE0 + sampler);
2118                 Phase *input = phase->inputs[sampler];
2119                 input->output_node->bound_sampler_num = sampler;
2120                 const auto it = output_textures.find(input);
2121                 assert(it != output_textures.end());
2122                 glBindTexture(GL_TEXTURE_2D, it->second);
2123                 check_error();
2124                 if (phase->input_needs_mipmaps && generated_mipmaps->count(input) == 0) {
2125                         glGenerateMipmap(GL_TEXTURE_2D);
2126                         check_error();
2127                         generated_mipmaps->insert(input);
2128                 }
2129                 setup_rtt_sampler(sampler, phase->input_needs_mipmaps);
2130                 phase->input_samplers[sampler] = sampler;  // Bind the sampler to the right uniform.
2131         }
2132
2133         GLuint instance_program_num = resource_pool->use_glsl_program(phase->glsl_program_num);
2134         check_error();
2135
2136         // And now the output.
2137         GLuint fbo = 0;
2138         if (phase->is_compute_shader) {
2139                 assert(!destinations.empty());
2140
2141                 // This is currently the only place where we use image units,
2142                 // so we can always start at 0. TODO: Support multiple destinations.
2143                 phase->outbuf_image_unit = 0;
2144                 glBindImageTexture(phase->outbuf_image_unit, destinations[0].texnum, 0, GL_FALSE, 0, GL_WRITE_ONLY, destinations[0].format);
2145                 check_error();
2146                 phase->inv_output_size.x = 1.0f / phase->output_width;
2147                 phase->inv_output_size.y = 1.0f / phase->output_height;
2148                 phase->output_texcoord_adjust.x = 0.5f / phase->output_width;
2149                 phase->output_texcoord_adjust.y = 0.5f / phase->output_height;
2150         } else if (!destinations.empty()) {
2151                 assert(destinations.size() == 1);
2152                 fbo = resource_pool->create_fbo(destinations[0].texnum);
2153                 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
2154                 glViewport(0, 0, phase->output_width, phase->output_height);
2155         }
2156
2157         // Give the required parameters to all the effects.
2158         unsigned sampler_num = phase->inputs.size();
2159         for (unsigned i = 0; i < phase->effects.size(); ++i) {
2160                 Node *node = phase->effects[i];
2161                 unsigned old_sampler_num = sampler_num;
2162                 node->effect->set_gl_state(instance_program_num, phase->effect_ids[node], &sampler_num);
2163                 check_error();
2164
2165                 if (node->effect->is_single_texture()) {
2166                         assert(sampler_num - old_sampler_num == 1);
2167                         node->bound_sampler_num = old_sampler_num;
2168                 } else {
2169                         node->bound_sampler_num = -1;
2170                 }
2171         }
2172
2173         if (phase->is_compute_shader) {
2174                 unsigned x, y, z;
2175                 phase->compute_shader_node->effect->get_compute_dimensions(phase->output_width, phase->output_height, &x, &y, &z);
2176
2177                 // Uniforms need to come after set_gl_state() _and_ get_compute_dimensions(),
2178                 // since they can be updated from there.
2179                 setup_uniforms(phase);
2180                 glDispatchCompute(x, y, z);
2181                 check_error();
2182                 glMemoryBarrier(GL_TEXTURE_FETCH_BARRIER_BIT | GL_TEXTURE_UPDATE_BARRIER_BIT);
2183                 check_error();
2184         } else {
2185                 // Uniforms need to come after set_gl_state(), since they can be updated
2186                 // from there.
2187                 setup_uniforms(phase);
2188
2189                 // Bind the vertex data.
2190                 GLuint vao = resource_pool->create_vec2_vao(phase->attribute_indexes, vbo);
2191                 glBindVertexArray(vao);
2192
2193                 glDrawArrays(GL_TRIANGLES, 0, 3);
2194                 check_error();
2195
2196                 resource_pool->release_vec2_vao(vao);
2197         }
2198
2199         for (unsigned i = 0; i < phase->effects.size(); ++i) {
2200                 Node *node = phase->effects[i];
2201                 node->effect->clear_gl_state();
2202         }
2203
2204         resource_pool->unuse_glsl_program(instance_program_num);
2205
2206         if (fbo != 0) {
2207                 resource_pool->release_fbo(fbo);
2208         }
2209 }
2210
2211 void EffectChain::setup_uniforms(Phase *phase)
2212 {
2213         // TODO: Use UBO blocks.
2214         for (size_t i = 0; i < phase->uniforms_image2d.size(); ++i) {
2215                 const Uniform<int> &uniform = phase->uniforms_image2d[i];
2216                 if (uniform.location != -1) {
2217                         glUniform1iv(uniform.location, uniform.num_values, uniform.value);
2218                 }
2219         }
2220         for (size_t i = 0; i < phase->uniforms_sampler2d.size(); ++i) {
2221                 const Uniform<int> &uniform = phase->uniforms_sampler2d[i];
2222                 if (uniform.location != -1) {
2223                         glUniform1iv(uniform.location, uniform.num_values, uniform.value);
2224                 }
2225         }
2226         for (size_t i = 0; i < phase->uniforms_bool.size(); ++i) {
2227                 const Uniform<bool> &uniform = phase->uniforms_bool[i];
2228                 assert(uniform.num_values == 1);
2229                 if (uniform.location != -1) {
2230                         glUniform1i(uniform.location, *uniform.value);
2231                 }
2232         }
2233         for (size_t i = 0; i < phase->uniforms_int.size(); ++i) {
2234                 const Uniform<int> &uniform = phase->uniforms_int[i];
2235                 if (uniform.location != -1) {
2236                         glUniform1iv(uniform.location, uniform.num_values, uniform.value);
2237                 }
2238         }
2239         for (size_t i = 0; i < phase->uniforms_float.size(); ++i) {
2240                 const Uniform<float> &uniform = phase->uniforms_float[i];
2241                 if (uniform.location != -1) {
2242                         glUniform1fv(uniform.location, uniform.num_values, uniform.value);
2243                 }
2244         }
2245         for (size_t i = 0; i < phase->uniforms_vec2.size(); ++i) {
2246                 const Uniform<float> &uniform = phase->uniforms_vec2[i];
2247                 if (uniform.location != -1) {
2248                         glUniform2fv(uniform.location, uniform.num_values, uniform.value);
2249                 }
2250         }
2251         for (size_t i = 0; i < phase->uniforms_vec3.size(); ++i) {
2252                 const Uniform<float> &uniform = phase->uniforms_vec3[i];
2253                 if (uniform.location != -1) {
2254                         glUniform3fv(uniform.location, uniform.num_values, uniform.value);
2255                 }
2256         }
2257         for (size_t i = 0; i < phase->uniforms_vec4.size(); ++i) {
2258                 const Uniform<float> &uniform = phase->uniforms_vec4[i];
2259                 if (uniform.location != -1) {
2260                         glUniform4fv(uniform.location, uniform.num_values, uniform.value);
2261                 }
2262         }
2263         for (size_t i = 0; i < phase->uniforms_mat3.size(); ++i) {
2264                 const Uniform<Matrix3d> &uniform = phase->uniforms_mat3[i];
2265                 assert(uniform.num_values == 1);
2266                 if (uniform.location != -1) {
2267                         // Convert to float (GLSL has no double matrices).
2268                         float matrixf[9];
2269                         for (unsigned y = 0; y < 3; ++y) {
2270                                 for (unsigned x = 0; x < 3; ++x) {
2271                                         matrixf[y + x * 3] = (*uniform.value)(y, x);
2272                                 }
2273                         }
2274                         glUniformMatrix3fv(uniform.location, 1, GL_FALSE, matrixf);
2275                 }
2276         }
2277 }
2278
2279 void EffectChain::setup_rtt_sampler(int sampler_num, bool use_mipmaps)
2280 {
2281         glActiveTexture(GL_TEXTURE0 + sampler_num);
2282         check_error();
2283         if (use_mipmaps) {
2284                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
2285                 check_error();
2286         } else {
2287                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
2288                 check_error();
2289         }
2290         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
2291         check_error();
2292         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
2293         check_error();
2294 }
2295
2296 }  // namespace movit