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

   1 #define GL_GLEXT_PROTOTYPES 1
   2
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <assert.h>
   6
   7 #include <GL/gl.h>
   8 #include <GL/glext.h>
   9
  10 #include <algorithm>
  11 #include <set>
  12 #include <stack>
  13 #include <vector>
  14
  15 #include "util.h"
  16 #include "effect_chain.h"
  17 #include "gamma_expansion_effect.h"
  18 #include "gamma_compression_effect.h"
  19 #include "colorspace_conversion_effect.h"
  20 #include "input.h"
  21
  22 EffectChain::EffectChain(unsigned width, unsigned height)
  23         : width(width),
  24           height(height),
  25           finalized(false) {}
  26
  27 Input *EffectChain::add_input(const ImageFormat &format)
  28 {
  29         char eff_id[256];
  30         sprintf(eff_id, "src_image%u", (unsigned)inputs.size());
  31
  32         Input *input = new Input(format, width, height);
  33         effects.push_back(input);
  34         inputs.push_back(input);
  35         output_color_space.insert(std::make_pair(input, format.color_space));
  36         output_gamma_curve.insert(std::make_pair(input, format.gamma_curve));
  37         effect_ids.insert(std::make_pair(input, eff_id));
  38         incoming_links.insert(std::make_pair(input, std::vector<Effect *>()));
  39         return input;
  40 }
  41
  42 void EffectChain::add_output(const ImageFormat &format)
  43 {
  44         output_format = format;
  45 }
  46
  47 void EffectChain::add_effect_raw(Effect *effect, const std::vector<Effect *> &inputs)
  48 {
  49         char effect_id[256];
  50         sprintf(effect_id, "eff%u", (unsigned)effects.size());
  51
  52         effects.push_back(effect);
  53         effect_ids.insert(std::make_pair(effect, effect_id));
  54         assert(inputs.size() == effect->num_inputs());
  55         for (unsigned i = 0; i < inputs.size(); ++i) {
  56                 assert(std::find(effects.begin(), effects.end(), inputs[i]) != effects.end());
  57                 outgoing_links[inputs[i]].push_back(effect);
  58         }
  59         incoming_links.insert(std::make_pair(effect, inputs));
  60         output_gamma_curve[effect] = output_gamma_curve[last_added_effect()];
  61         output_color_space[effect] = output_color_space[last_added_effect()];
  62 }
  63
  64 // Set the "use_srgb_texture_format" option on all inputs that feed into this node,
  65 // and update the output_gamma_curve[] map as we go.
  66 //
  67 // NOTE: We assume that the only way we could actually get GAMMA_sRGB from an
  68 // effect (except from GammaCompressionCurve, which should never be inserted
  69 // into a chain when this is called) is by pass-through from a texture.
  70 // Thus, we can simply feed the flag up towards all inputs.
  71 void EffectChain::set_use_srgb_texture_format(Effect *effect)
  72 {
  73         assert(output_gamma_curve.count(effect) != 0);
  74         assert(output_gamma_curve[effect] == GAMMA_sRGB);
  75         if (effect->num_inputs() == 0) {
  76                 effect->set_int("use_srgb_texture_format", 1);
  77         } else {
  78                 assert(incoming_links.count(effect) == 1);
  79                 std::vector<Effect *> deps = incoming_links[effect];
  80                 assert(effect->num_inputs() == deps.size());
  81                 for (unsigned i = 0; i < deps.size(); ++i) {
  82                         set_use_srgb_texture_format(deps[i]);
  83                         assert(output_gamma_curve[deps[i]] == GAMMA_LINEAR);
  84                 }
  85         }
  86         output_gamma_curve[effect] = GAMMA_LINEAR;
  87 }
  88
  89 Effect *EffectChain::normalize_to_linear_gamma(Effect *input)
  90 {
  91         assert(output_gamma_curve.count(input) != 0);
  92         if (output_gamma_curve[input] == GAMMA_sRGB) {
  93                 // TODO: check if the extension exists
  94                 set_use_srgb_texture_format(input);
  95                 output_gamma_curve[input] = GAMMA_LINEAR;
  96                 return input;
  97         } else {
  98                 GammaExpansionEffect *gamma_conversion = new GammaExpansionEffect();
  99                 gamma_conversion->set_int("source_curve", output_gamma_curve[input]);
 100                 std::vector<Effect *> inputs;
 101                 inputs.push_back(input);
 102                 gamma_conversion->add_self_to_effect_chain(this, inputs);
 103                 output_gamma_curve[gamma_conversion] = GAMMA_LINEAR;
 104                 return gamma_conversion;
 105         }
 106 }
 107
 108 Effect *EffectChain::normalize_to_srgb(Effect *input)
 109 {
 110         assert(output_gamma_curve.count(input) != 0);
 111         assert(output_color_space.count(input) != 0);
 112         assert(output_gamma_curve[input] == GAMMA_LINEAR);
 113         ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
 114         colorspace_conversion->set_int("source_space", output_color_space[input]);
 115         colorspace_conversion->set_int("destination_space", COLORSPACE_sRGB);
 116         std::vector<Effect *> inputs;
 117         inputs.push_back(input);
 118         colorspace_conversion->add_self_to_effect_chain(this, inputs);
 119         output_color_space[colorspace_conversion] = COLORSPACE_sRGB;
 120         return colorspace_conversion;
 121 }
 122
 123 Effect *EffectChain::add_effect(Effect *effect, const std::vector<Effect *> &inputs)
 124 {
 125         assert(inputs.size() == effect->num_inputs());
 126
 127         std::vector<Effect *> normalized_inputs = inputs;
 128         for (unsigned i = 0; i < normalized_inputs.size(); ++i) {
 129                 assert(output_gamma_curve.count(normalized_inputs[i]) != 0);
 130                 if (effect->needs_linear_light() && output_gamma_curve[normalized_inputs[i]] != GAMMA_LINEAR) {
 131                         normalized_inputs[i] = normalize_to_linear_gamma(normalized_inputs[i]);
 132                 }
 133                 assert(output_color_space.count(normalized_inputs[i]) != 0);
 134                 if (effect->needs_srgb_primaries() && output_color_space[normalized_inputs[i]] != COLORSPACE_sRGB) {
 135                         normalized_inputs[i] = normalize_to_srgb(normalized_inputs[i]);
 136                 }
 137         }
 138
 139         effect->add_self_to_effect_chain(this, normalized_inputs);
 140         return effect;
 141 }
 142
 143 // GLSL pre-1.30 doesn't support token pasting. Replace PREFIX(x) with <effect_id>_x.
 144 std::string replace_prefix(const std::string &text, const std::string &prefix)
 145 {
 146         std::string output;
 147         size_t start = 0;
 148
 149         while (start < text.size()) {
 150                 size_t pos = text.find("PREFIX(", start);
 151                 if (pos == std::string::npos) {
 152                         output.append(text.substr(start, std::string::npos));
 153                         break;
 154                 }
 155
 156                 output.append(text.substr(start, pos - start));
 157                 output.append(prefix);
 158                 output.append("_");
 159
 160                 pos += strlen("PREFIX(");
 161
 162                 // Output stuff until we find the matching ), which we then eat.
 163                 int depth = 1;
 164                 size_t end_arg_pos = pos;
 165                 while (end_arg_pos < text.size()) {
 166                         if (text[end_arg_pos] == '(') {
 167                                 ++depth;
 168                         } else if (text[end_arg_pos] == ')') {
 169                                 --depth;
 170                                 if (depth == 0) {
 171                                         break;
 172                                 }
 173                         }
 174                         ++end_arg_pos;
 175                 }
 176                 output.append(text.substr(pos, end_arg_pos - pos));
 177                 ++end_arg_pos;
 178                 assert(depth == 0);
 179                 start = end_arg_pos;
 180         }
 181         return output;
 182 }
 183
 184 EffectChain::Phase EffectChain::compile_glsl_program(const std::vector<Effect *> &inputs, const std::vector<Effect *> &effects)
 185 {
 186         assert(!effects.empty());
 187
 188         // Deduplicate the inputs.
 189         std::vector<Effect *> true_inputs = inputs;
 190         std::sort(true_inputs.begin(), true_inputs.end());
 191         true_inputs.erase(std::unique(true_inputs.begin(), true_inputs.end()), true_inputs.end());
 192
 193         bool input_needs_mipmaps = false;
 194         std::string frag_shader = read_file("header.frag");
 195
 196         // Create functions for all the texture inputs that we need.
 197         for (unsigned i = 0; i < true_inputs.size(); ++i) {
 198                 Effect *effect = true_inputs[i];
 199                 assert(effect_ids.count(effect) != 0);
 200                 std::string effect_id = effect_ids[effect];
 201
 202                 frag_shader += std::string("uniform sampler2D tex_") + effect_id + ";\n";
 203                 frag_shader += std::string("vec4 ") + effect_id + "(vec2 tc) {\n";
 204                 if (effect->num_inputs() == 0) {
 205                         // OpenGL's origin is bottom-left, but most graphics software assumes
 206                         // a top-left origin. Thus, for inputs that come from the user,
 207                         // we flip the y coordinate. However, for FBOs, the origin
 208                         // is all correct, so don't do anything.
 209                         frag_shader += "\ttc.y = 1.0f - tc.y;\n";
 210                 }
 211                 frag_shader += "\treturn texture2D(tex_" + effect_id + ", tc);\n";
 212                 frag_shader += "}\n";
 213                 frag_shader += "\n";
 214         }
 215
 216         std::string last_effect_id;
 217         for (unsigned i = 0; i < effects.size(); ++i) {
 218                 Effect *effect = effects[i];
 219                 assert(effect != NULL);
 220                 assert(effect_ids.count(effect) != 0);
 221                 std::string effect_id = effect_ids[effect];
 222                 last_effect_id = effect_id;
 223
 224                 if (incoming_links[effect].size() == 1) {
 225                         frag_shader += std::string("#define INPUT ") + effect_ids[incoming_links[effect][0]] + "\n";
 226                 } else {
 227                         for (unsigned j = 0; j < incoming_links[effect].size(); ++j) {
 228                                 char buf[256];
 229                                 sprintf(buf, "#define INPUT%d %s\n", j + 1, effect_ids[incoming_links[effect][j]].c_str());
 230                                 frag_shader += buf;
 231                         }
 232                 }
 233
 234                 frag_shader += "\n";
 235                 frag_shader += std::string("#define FUNCNAME ") + effect_id + "\n";
 236                 frag_shader += replace_prefix(effect->output_convenience_uniforms(), effect_id);
 237                 frag_shader += replace_prefix(effect->output_fragment_shader(), effect_id);
 238                 frag_shader += "#undef PREFIX\n";
 239                 frag_shader += "#undef FUNCNAME\n";
 240                 if (incoming_links[effect].size() == 1) {
 241                         frag_shader += "#undef INPUT\n";
 242                 } else {
 243                         for (unsigned j = 0; j < incoming_links[effect].size(); ++j) {
 244                                 char buf[256];
 245                                 sprintf(buf, "#undef INPUT%d\n", j + 1);
 246                                 frag_shader += buf;
 247                         }
 248                 }
 249                 frag_shader += "\n";
 250
 251                 input_needs_mipmaps |= effect->needs_mipmaps();
 252         }
 253         for (unsigned i = 0; i < effects.size(); ++i) {
 254                 Effect *effect = effects[i];
 255                 if (effect->num_inputs() == 0) {
 256                         effect->set_int("needs_mipmaps", input_needs_mipmaps);
 257                 }
 258         }
 259         assert(!last_effect_id.empty());
 260         frag_shader += std::string("#define INPUT ") + last_effect_id + "\n";
 261         frag_shader.append(read_file("footer.frag"));
 262         printf("%s\n", frag_shader.c_str());
 263
 264         GLuint glsl_program_num = glCreateProgram();
 265         GLuint vs_obj = compile_shader(read_file("vs.vert"), GL_VERTEX_SHADER);
 266         GLuint fs_obj = compile_shader(frag_shader, GL_FRAGMENT_SHADER);
 267         glAttachShader(glsl_program_num, vs_obj);
 268         check_error();
 269         glAttachShader(glsl_program_num, fs_obj);
 270         check_error();
 271         glLinkProgram(glsl_program_num);
 272         check_error();
 273
 274         Phase phase;
 275         phase.glsl_program_num = glsl_program_num;
 276         phase.input_needs_mipmaps = input_needs_mipmaps;
 277         phase.inputs = true_inputs;
 278         phase.effects = effects;
 279
 280         return phase;
 281 }
 282
 283 // Construct GLSL programs, starting at the given effect and following
 284 // the chain from there. We end a program every time we come to an effect
 285 // marked as "needs texture bounce", one that is used by multiple other
 286 // effects, and of course at the end.
 287 //
 288 // We follow a quite simple depth-first search from the output, although
 289 // without any explicit recursion.
 290 void EffectChain::construct_glsl_programs(Effect *output)
 291 {
 292         // Which effects have already been completed in this phase?
 293         // We need to keep track of it, as an effect with multiple outputs
 294         // could otherwise be calculate multiple times.
 295         std::set<Effect *> completed_effects;
 296
 297         // Effects in the current phase, as well as inputs (outputs from other phases
 298         // that we depend on). Note that since we start iterating from the end,
 299         // the effect list will be in the reverse order.
 300         std::vector<Effect *> this_phase_inputs;
 301         std::vector<Effect *> this_phase_effects;
 302
 303         // Effects that we have yet to calculate, but that we know should
 304         // be in the current phase.
 305         std::stack<Effect *> effects_todo_this_phase;
 306
 307         // Effects that we have yet to calculate, but that come from other phases.
 308         // We delay these until we have this phase done in its entirety,
 309         // at which point we pick any of them and start a new phase from that.
 310         std::stack<Effect *> effects_todo_other_phases;
 311
 312         effects_todo_this_phase.push(output);
 313
 314         for ( ;; ) {  // Termination condition within loop.
 315                 if (!effects_todo_this_phase.empty()) {
 316                         // OK, we have more to do this phase.
 317                         Effect *effect = effects_todo_this_phase.top();
 318                         effects_todo_this_phase.pop();
 319
 320                         // This should currently only happen for effects that are phase outputs,
 321                         // and we throw those out separately below.
 322                         assert(completed_effects.count(effect) == 0);
 323
 324                         this_phase_effects.push_back(effect);
 325                         completed_effects.insert(effect);
 326
 327                         // Find all the dependencies of this effect, and add them to the stack.
 328                         assert(incoming_links.count(effect) == 1);
 329                         std::vector<Effect *> deps = incoming_links[effect];
 330                         assert(effect->num_inputs() == deps.size());
 331                         for (unsigned i = 0; i < deps.size(); ++i) {
 332                                 bool start_new_phase = false;
 333
 334                                 if (effect->needs_texture_bounce()) {
 335                                         start_new_phase = true;
 336                                 }
 337
 338                                 assert(outgoing_links.count(deps[i]) == 1);
 339                                 if (outgoing_links[deps[i]].size() > 1 && deps[i]->num_inputs() > 0) {
 340                                         // More than one effect uses this as the input,
 341                                         // and it is not a texture itself.
 342                                         // The easiest thing to do (and probably also the safest
 343                                         // performance-wise in most cases) is to bounce it to a texture
 344                                         // and then let the next passes read from that.
 345                                         start_new_phase = true;
 346                                 }
 347
 348                                 if (start_new_phase) {
 349                                         effects_todo_other_phases.push(deps[i]);
 350                                         this_phase_inputs.push_back(deps[i]);
 351                                 } else {
 352                                         effects_todo_this_phase.push(deps[i]);
 353                                 }
 354                         }
 355                         continue;
 356                 }
 357
 358                 // No more effects to do this phase. Take all the ones we have,
 359                 // and create a GLSL program for it.
 360                 if (!this_phase_effects.empty()) {
 361                         reverse(this_phase_effects.begin(), this_phase_effects.end());
 362                         phases.push_back(compile_glsl_program(this_phase_inputs, this_phase_effects));
 363                         this_phase_inputs.clear();
 364                         this_phase_effects.clear();
 365                 }
 366                 assert(this_phase_inputs.empty());
 367                 assert(this_phase_effects.empty());
 368
 369                 // If we have no effects left, exit.
 370                 if (effects_todo_other_phases.empty()) {
 371                         break;
 372                 }
 373
 374                 Effect *effect = effects_todo_other_phases.top();
 375                 effects_todo_other_phases.pop();
 376
 377                 if (completed_effects.count(effect) == 0) {
 378                         // Start a new phase, calculating from this effect.
 379                         effects_todo_this_phase.push(effect);
 380                 }
 381         }
 382
 383         // Finally, since the phases are found from the output but must be executed
 384         // from the input(s), reverse them, too.
 385         std::reverse(phases.begin(), phases.end());
 386 }
 387
 388 void EffectChain::finalize()
 389 {
 390         // Find the output effect. This is, simply, one that has no outgoing links.
 391         // If there are multiple ones, the graph is malformed (we do not support
 392         // multiple outputs right now).
 393         std::vector<Effect *> output_effects;
 394         for (unsigned i = 0; i < effects.size(); ++i) {
 395                 Effect *effect = effects[i];
 396                 if (outgoing_links.count(effect) == 0 || outgoing_links[effect].size() == 0) {
 397                         output_effects.push_back(effect);
 398                 }
 399         }
 400         assert(output_effects.size() == 1);
 401         Effect *output_effect = output_effects[0];
 402
 403         // Add normalizers to get the output format right.
 404         assert(output_gamma_curve.count(output_effect) != 0);
 405         assert(output_color_space.count(output_effect) != 0);
 406         ColorSpace current_color_space = output_color_space[output_effect];
 407         if (current_color_space != output_format.color_space) {
 408                 ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
 409                 colorspace_conversion->set_int("source_space", current_color_space);
 410                 colorspace_conversion->set_int("destination_space", output_format.color_space);
 411                 std::vector<Effect *> inputs;
 412                 inputs.push_back(output_effect);
 413                 colorspace_conversion->add_self_to_effect_chain(this, inputs);
 414                 output_color_space[colorspace_conversion] = output_format.color_space;
 415                 output_effect = colorspace_conversion;
 416         }
 417         GammaCurve current_gamma_curve = output_gamma_curve[output_effect];
 418         if (current_gamma_curve != output_format.gamma_curve) {
 419                 if (current_gamma_curve != GAMMA_LINEAR) {
 420                         output_effect = normalize_to_linear_gamma(output_effect);
 421                         current_gamma_curve = GAMMA_LINEAR;
 422                 }
 423                 GammaCompressionEffect *gamma_conversion = new GammaCompressionEffect();
 424                 gamma_conversion->set_int("destination_curve", output_format.gamma_curve);
 425                 std::vector<Effect *> inputs;
 426                 inputs.push_back(output_effect);
 427                 gamma_conversion->add_self_to_effect_chain(this, inputs);
 428                 output_gamma_curve[gamma_conversion] = output_format.gamma_curve;
 429                 output_effect = gamma_conversion;
 430         }
 431
 432         // Construct all needed GLSL programs, starting at the output.
 433         construct_glsl_programs(output_effect);
 434
 435         // If we have more than one phase, we need intermediate render-to-texture.
 436         // Construct an FBO, and then as many textures as we need.
 437         // We choose the simplest option of having one texture per output,
 438         // since otherwise this turns into an (albeit simple)
 439         // register allocation problem.
 440         if (phases.size() > 1) {
 441                 glGenFramebuffers(1, &fbo);
 442
 443                 for (unsigned i = 0; i < phases.size() - 1; ++i) {
 444                         Effect *output_effect = phases[i].effects.back();
 445                         GLuint temp_texture;
 446                         glGenTextures(1, &temp_texture);
 447                         check_error();
 448                         glBindTexture(GL_TEXTURE_2D, temp_texture);
 449                         check_error();
 450                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 451                         check_error();
 452                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 453                         check_error();
 454                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 455                         check_error();
 456                         effect_output_textures.insert(std::make_pair(output_effect, temp_texture));
 457                 }
 458         }
 459
 460         for (unsigned i = 0; i < inputs.size(); ++i) {
 461                 inputs[i]->finalize();
 462         }
 463
 464         finalized = true;
 465 }
 466
 467 void EffectChain::render_to_screen()
 468 {
 469         assert(finalized);
 470
 471         // Basic state.
 472         glDisable(GL_BLEND);
 473         check_error();
 474         glDisable(GL_DEPTH_TEST);
 475         check_error();
 476         glDepthMask(GL_FALSE);
 477         check_error();
 478
 479         glMatrixMode(GL_PROJECTION);
 480         glLoadIdentity();
 481         glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0);
 482
 483         glMatrixMode(GL_MODELVIEW);
 484         glLoadIdentity();
 485
 486         if (phases.size() > 1) {
 487                 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 488                 check_error();
 489         }
 490
 491         std::set<Effect *> generated_mipmaps;
 492         for (unsigned i = 0; i < inputs.size(); ++i) {
 493                 // Inputs generate their own mipmaps if they need to
 494                 // (see input.cpp).
 495                 generated_mipmaps.insert(inputs[i]);
 496         }
 497
 498         for (unsigned phase = 0; phase < phases.size(); ++phase) {
 499                 glUseProgram(phases[phase].glsl_program_num);
 500                 check_error();
 501
 502                 // Set up RTT inputs for this phase.
 503                 for (unsigned sampler = 0; sampler < phases[phase].inputs.size(); ++sampler) {
 504                         glActiveTexture(GL_TEXTURE0 + sampler);
 505                         Effect *input = phases[phase].inputs[sampler];
 506                         assert(effect_output_textures.count(input) != 0);
 507                         glBindTexture(GL_TEXTURE_2D, effect_output_textures[input]);
 508                         check_error();
 509                         if (phases[phase].input_needs_mipmaps) {
 510                                 if (generated_mipmaps.count(input) == 0) {
 511                                         glGenerateMipmap(GL_TEXTURE_2D);
 512                                         check_error();
 513                                         generated_mipmaps.insert(input);
 514                                 }
 515                                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
 516                                 check_error();
 517                         } else {
 518                                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 519                                 check_error();
 520                         }
 521
 522                         assert(effect_ids.count(input));
 523                         std::string texture_name = std::string("tex_") + effect_ids[input];
 524                         glUniform1i(glGetUniformLocation(phases[phase].glsl_program_num, texture_name.c_str()), sampler);
 525                         check_error();
 526                 }
 527
 528                 // And now the output.
 529                 if (phase == phases.size() - 1) {
 530                         // Last phase goes directly to the screen.
 531                         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 532                         check_error();
 533                 } else {
 534                         Effect *last_effect = phases[phase].effects.back();
 535                         assert(effect_output_textures.count(last_effect) != 0);
 536                         glFramebufferTexture2D(
 537                                 GL_FRAMEBUFFER,
 538                                 GL_COLOR_ATTACHMENT0,
 539                                 GL_TEXTURE_2D,
 540                                 effect_output_textures[last_effect],
 541                                 0);
 542                         check_error();
 543                 }
 544
 545                 // Give the required parameters to all the effects.
 546                 unsigned sampler_num = phases[phase].inputs.size();
 547                 for (unsigned i = 0; i < phases[phase].effects.size(); ++i) {
 548                         Effect *effect = phases[phase].effects[i];
 549                         effect->set_gl_state(phases[phase].glsl_program_num, effect_ids[effect], &sampler_num);
 550                 }
 551
 552                 // Now draw!
 553                 glBegin(GL_QUADS);
 554
 555                 glTexCoord2f(0.0f, 0.0f);
 556                 glVertex2f(0.0f, 0.0f);
 557
 558                 glTexCoord2f(1.0f, 0.0f);
 559                 glVertex2f(1.0f, 0.0f);
 560
 561                 glTexCoord2f(1.0f, 1.0f);
 562                 glVertex2f(1.0f, 1.0f);
 563
 564                 glTexCoord2f(0.0f, 1.0f);
 565                 glVertex2f(0.0f, 1.0f);
 566
 567                 glEnd();
 568                 check_error();
 569
 570                 for (unsigned i = 0; i < phases[phase].effects.size(); ++i) {
 571                         Effect *effect = phases[phase].effects[i];
 572                         effect->clear_gl_state();
 573                 }
 574         }
 575 }