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