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
  13 #include "util.h"
  14 #include "effect_chain.h"
  15 #include "gamma_expansion_effect.h"
  16 #include "gamma_compression_effect.h"
  17 #include "lift_gamma_gain_effect.h"
  18 #include "colorspace_conversion_effect.h"
  19 #include "sandbox_effect.h"
  20 #include "saturation_effect.h"
  21 #include "mirror_effect.h"
  22 #include "vignette_effect.h"
  23 #include "blur_effect.h"
  24 #include "diffusion_effect.h"
  25 #include "glow_effect.h"
  26 #include "mix_effect.h"
  27 #include "input.h"
  28
  29 EffectChain::EffectChain(unsigned width, unsigned height)
  30         : width(width),
  31           height(height),
  32           finalized(false) {}
  33
  34 Input *EffectChain::add_input(const ImageFormat &format)
  35 {
  36         Input *input = new Input(format, width, height);
  37         effects.push_back(input);
  38         inputs.push_back(input);
  39         output_color_space.insert(std::make_pair(input, format.color_space));
  40         output_gamma_curve.insert(std::make_pair(input, format.gamma_curve));
  41         effect_ids.insert(std::make_pair(input, "src_image"));
  42         incoming_links.insert(std::make_pair(input, std::vector<Effect *>()));
  43         return input;
  44 }
  45
  46 void EffectChain::add_output(const ImageFormat &format)
  47 {
  48         output_format = format;
  49 }
  50
  51 void EffectChain::add_effect_raw(Effect *effect, const std::vector<Effect *> &inputs)
  52 {
  53         char effect_id[256];
  54         sprintf(effect_id, "eff%u", (unsigned)effects.size());
  55
  56         effects.push_back(effect);
  57         effect_ids.insert(std::make_pair(effect, effect_id));
  58         assert(inputs.size() == effect->num_inputs());
  59         for (unsigned i = 0; i < inputs.size(); ++i) {
  60                 assert(std::find(effects.begin(), effects.end(), inputs[i]) != effects.end());
  61                 outgoing_links[inputs[i]].push_back(effect);
  62         }
  63         incoming_links.insert(std::make_pair(effect, inputs));
  64         output_gamma_curve[effect] = output_gamma_curve[last_added_effect()];
  65         output_color_space[effect] = output_color_space[last_added_effect()];
  66 }
  67
  68 Effect *instantiate_effect(EffectId effect)
  69 {
  70         switch (effect) {
  71         case EFFECT_GAMMA_EXPANSION:
  72                 return new GammaExpansionEffect();
  73         case EFFECT_GAMMA_COMPRESSION:
  74                 return new GammaCompressionEffect();
  75         case EFFECT_COLOR_SPACE_CONVERSION:
  76                 return new ColorSpaceConversionEffect();
  77         case EFFECT_SANDBOX:
  78                 return new SandboxEffect();
  79         case EFFECT_LIFT_GAMMA_GAIN:
  80                 return new LiftGammaGainEffect();
  81         case EFFECT_SATURATION:
  82                 return new SaturationEffect();
  83         case EFFECT_MIRROR:
  84                 return new MirrorEffect();
  85         case EFFECT_VIGNETTE:
  86                 return new VignetteEffect();
  87         case EFFECT_BLUR:
  88                 return new BlurEffect();
  89         case EFFECT_DIFFUSION:
  90                 return new DiffusionEffect();
  91         case EFFECT_GLOW:
  92                 return new GlowEffect();
  93         case EFFECT_MIX:
  94                 return new MixEffect();
  95         }
  96         assert(false);
  97 }
  98
  99 // Set the "use_srgb_texture_format" option on all inputs that feed into this node,
 100 // and update the output_gamma_curve[] map as we go.
 101 //
 102 // NOTE: We assume that the only way we could actually get GAMMA_sRGB from an
 103 // effect (except from GammaCompressionCurve, which should never be inserted
 104 // into a chain when this is called) is by pass-through from a texture.
 105 // Thus, we can simply feed the flag up towards all inputs.
 106 void EffectChain::set_use_srgb_texture_format(Effect *effect)
 107 {
 108         assert(output_gamma_curve.count(effect) != 0);
 109         assert(output_gamma_curve[effect] == GAMMA_sRGB);
 110         if (effect->num_inputs() == 0) {
 111                 effect->set_int("use_srgb_texture_format", 1);
 112         } else {
 113                 assert(incoming_links.count(effect) == 1);
 114                 std::vector<Effect *> deps = incoming_links[effect];
 115                 assert(effect->num_inputs() == deps.size());
 116                 for (unsigned i = 0; i < deps.size(); ++i) {
 117                         set_use_srgb_texture_format(deps[i]);
 118                         assert(output_gamma_curve[deps[i]] == GAMMA_LINEAR);
 119                 }
 120         }
 121         output_gamma_curve[effect] = GAMMA_LINEAR;
 122 }
 123
 124 Effect *EffectChain::normalize_to_linear_gamma(Effect *input)
 125 {
 126         assert(output_gamma_curve.count(input) != 0);
 127         if (output_gamma_curve[input] == GAMMA_sRGB) {
 128                 // TODO: check if the extension exists
 129                 set_use_srgb_texture_format(input);
 130                 output_gamma_curve[input] = GAMMA_LINEAR;
 131                 return input;
 132         } else {
 133                 GammaExpansionEffect *gamma_conversion = new GammaExpansionEffect();
 134                 gamma_conversion->set_int("source_curve", output_gamma_curve[input]);
 135                 std::vector<Effect *> inputs;
 136                 inputs.push_back(input);
 137                 gamma_conversion->add_self_to_effect_chain(this, inputs);
 138                 output_gamma_curve[gamma_conversion] = GAMMA_LINEAR;
 139                 return gamma_conversion;
 140         }
 141 }
 142
 143 Effect *EffectChain::normalize_to_srgb(Effect *input)
 144 {
 145         assert(output_gamma_curve.count(input) != 0);
 146         assert(output_color_space.count(input) != 0);
 147         assert(output_gamma_curve[input] == GAMMA_LINEAR);
 148         ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
 149         colorspace_conversion->set_int("source_space", output_color_space[input]);
 150         colorspace_conversion->set_int("destination_space", COLORSPACE_sRGB);
 151         std::vector<Effect *> inputs;
 152         inputs.push_back(input);
 153         colorspace_conversion->add_self_to_effect_chain(this, inputs);
 154         output_color_space[colorspace_conversion] = COLORSPACE_sRGB;
 155         return colorspace_conversion;
 156 }
 157
 158 Effect *EffectChain::add_effect(EffectId effect_id, const std::vector<Effect *> &inputs)
 159 {
 160         Effect *effect = instantiate_effect(effect_id);
 161
 162         assert(inputs.size() == effect->num_inputs());
 163
 164         std::vector<Effect *> normalized_inputs = inputs;
 165         for (unsigned i = 0; i < normalized_inputs.size(); ++i) {
 166                 assert(output_gamma_curve.count(normalized_inputs[i]) != 0);
 167                 if (effect->needs_linear_light() && output_gamma_curve[normalized_inputs[i]] != GAMMA_LINEAR) {
 168                         normalized_inputs[i] = normalize_to_linear_gamma(normalized_inputs[i]);
 169                 }
 170                 assert(output_color_space.count(normalized_inputs[i]) != 0);
 171                 if (effect->needs_srgb_primaries() && output_color_space[normalized_inputs[i]] != COLORSPACE_sRGB) {
 172                         normalized_inputs[i] = normalize_to_srgb(normalized_inputs[i]);
 173                 }
 174         }
 175
 176         effect->add_self_to_effect_chain(this, normalized_inputs);
 177         return effect;
 178 }
 179
 180 // GLSL pre-1.30 doesn't support token pasting. Replace PREFIX(x) with <effect_id>_x.
 181 std::string replace_prefix(const std::string &text, const std::string &prefix)
 182 {
 183         std::string output;
 184         size_t start = 0;
 185
 186         while (start < text.size()) {
 187                 size_t pos = text.find("PREFIX(", start);
 188                 if (pos == std::string::npos) {
 189                         output.append(text.substr(start, std::string::npos));
 190                         break;
 191                 }
 192
 193                 output.append(text.substr(start, pos - start));
 194                 output.append(prefix);
 195                 output.append("_");
 196
 197                 pos += strlen("PREFIX(");
 198
 199                 // Output stuff until we find the matching ), which we then eat.
 200                 int depth = 1;
 201                 size_t end_arg_pos = pos;
 202                 while (end_arg_pos < text.size()) {
 203                         if (text[end_arg_pos] == '(') {
 204                                 ++depth;
 205                         } else if (text[end_arg_pos] == ')') {
 206                                 --depth;
 207                                 if (depth == 0) {
 208                                         break;
 209                                 }
 210                         }
 211                         ++end_arg_pos;
 212                 }
 213                 output.append(text.substr(pos, end_arg_pos - pos));
 214                 ++end_arg_pos;
 215                 assert(depth == 0);
 216                 start = end_arg_pos;
 217         }
 218         return output;
 219 }
 220
 221 EffectChain::Phase EffectChain::compile_glsl_program(const std::vector<Effect *> &inputs, const std::vector<Effect *> &effects)
 222 {
 223         assert(!inputs.empty());
 224         assert(!effects.empty());
 225
 226         // Figure out the true set of inputs to this phase. These are the ones
 227         // that we need somehow but don't calculate ourselves.
 228         std::set<Effect *> effect_set(effects.begin(), effects.end());
 229         std::set<Effect *> input_set(inputs.begin(), inputs.end());
 230         std::vector<Effect *> true_inputs;
 231         std::set_difference(input_set.begin(), input_set.end(),
 232                 effect_set.begin(), effect_set.end(),
 233                 std::back_inserter(true_inputs));
 234
 235         bool input_needs_mipmaps = false;
 236         std::string frag_shader = read_file("header.frag");
 237
 238         // Create functions for all the texture inputs that we need.
 239         for (unsigned i = 0; i < true_inputs.size(); ++i) {
 240                 Effect *effect = true_inputs[i];
 241                 assert(effect_ids.count(effect) != 0);
 242                 std::string effect_id = effect_ids[effect];
 243
 244                 frag_shader += std::string("uniform sampler2D tex_") + effect_id + ";\n";
 245                 frag_shader += std::string("vec4 ") + effect_id + "(vec2 tc) {\n";
 246                 if (effect->num_inputs() == 0) {
 247                         // OpenGL's origin is bottom-left, but most graphics software assumes
 248                         // a top-left origin. Thus, for inputs that come from the user,
 249                         // we flip the y coordinate. However, for FBOs, the origin
 250                         // is all correct, so don't do anything.
 251                         frag_shader += "\ttc.y = 1.0f - tc.y;\n";
 252                 }
 253                 frag_shader += "\treturn texture2D(tex_" + effect_id + ", tc);\n";
 254                 frag_shader += "}\n";
 255                 frag_shader += "\n";
 256         }
 257
 258         std::string last_effect_id;
 259         for (unsigned i = 0; i < effects.size(); ++i) {
 260                 Effect *effect = effects[i];
 261                 assert(effect != NULL);
 262                 assert(effect_ids.count(effect) != 0);
 263                 std::string effect_id = effect_ids[effect];
 264                 last_effect_id = effect_id;
 265
 266                 if (incoming_links[effect].size() == 1) {
 267                         frag_shader += std::string("#define INPUT ") + effect_ids[incoming_links[effect][0]] + "\n";
 268                 } else {
 269                         for (unsigned j = 0; j < incoming_links[effect].size(); ++j) {
 270                                 char buf[256];
 271                                 sprintf(buf, "#define INPUT%d %s\n", j + 1, effect_ids[incoming_links[effect][j]].c_str());
 272                                 frag_shader += buf;
 273                         }
 274                 }
 275
 276                 frag_shader += "\n";
 277                 frag_shader += std::string("#define FUNCNAME ") + effect_id + "\n";
 278                 frag_shader += replace_prefix(effect->output_convenience_uniforms(), effect_id);
 279                 frag_shader += replace_prefix(effect->output_fragment_shader(), effect_id);
 280                 frag_shader += "#undef PREFIX\n";
 281                 frag_shader += "#undef FUNCNAME\n";
 282                 if (incoming_links[effect].size() == 1) {
 283                         frag_shader += "#undef INPUT\n";
 284                 } else {
 285                         for (unsigned j = 0; j < incoming_links[effect].size(); ++j) {
 286                                 char buf[256];
 287                                 sprintf(buf, "#undef INPUT%d\n", j + 1);
 288                                 frag_shader += buf;
 289                         }
 290                 }
 291                 frag_shader += "\n";
 292
 293                 input_needs_mipmaps |= effect->needs_mipmaps();
 294         }
 295         for (unsigned i = 0; i < effects.size(); ++i) {
 296                 Effect *effect = effects[i];
 297                 if (effect->num_inputs() == 0) {
 298                         effect->set_int("needs_mipmaps", input_needs_mipmaps);
 299                 }
 300         }
 301         assert(!last_effect_id.empty());
 302         frag_shader += std::string("#define INPUT ") + last_effect_id + "\n";
 303         frag_shader.append(read_file("footer.frag"));
 304         printf("%s\n", frag_shader.c_str());
 305
 306         GLuint glsl_program_num = glCreateProgram();
 307         GLuint vs_obj = compile_shader(read_file("vs.vert"), GL_VERTEX_SHADER);
 308         GLuint fs_obj = compile_shader(frag_shader, GL_FRAGMENT_SHADER);
 309         glAttachShader(glsl_program_num, vs_obj);
 310         check_error();
 311         glAttachShader(glsl_program_num, fs_obj);
 312         check_error();
 313         glLinkProgram(glsl_program_num);
 314         check_error();
 315
 316         Phase phase;
 317         phase.glsl_program_num = glsl_program_num;
 318         phase.input_needs_mipmaps = input_needs_mipmaps;
 319         phase.inputs = true_inputs;
 320         phase.effects = effects;
 321
 322         return phase;
 323 }
 324
 325 // Construct GLSL programs, starting at the given effect and following
 326 // the chain from there. We end a program every time we come to an effect
 327 // marked as "needs texture bounce", one that is used by multiple other
 328 // effects, and of course at the end.
 329 void EffectChain::construct_glsl_programs(Effect *start, std::set<Effect *> *completed_effects)
 330 {
 331         assert(start != NULL);
 332         if (completed_effects->count(start) != 0) {
 333                 // This has already been done for us.
 334                 return;
 335         }
 336
 337         std::vector<Effect *> this_phase_inputs;  // Also includes all intermediates; these will be filtered away later.
 338         std::vector<Effect *> this_phase_effects;
 339         Effect *node = start;
 340         for ( ;; ) {  // Termination condition within loop.
 341                 assert(node != NULL);
 342
 343                 // Check that we have all the inputs we need for this effect.
 344                 // If not, we end the phase here right away; the other side
 345                 // of the input chain will eventually come and pick the effect up.
 346                 assert(incoming_links.count(node) == 1);
 347                 std::vector<Effect *> deps = incoming_links[node];
 348                 assert(node->num_inputs() == deps.size());
 349                 if (!deps.empty()) {
 350                         bool have_all_deps = true;
 351                         for (unsigned i = 0; i < deps.size(); ++i) {
 352                                 if (completed_effects->count(deps[i]) == 0) {
 353                                         have_all_deps = false;
 354                                         break;
 355                                 }
 356                         }
 357
 358                         if (!have_all_deps) {
 359                                 if (!this_phase_effects.empty()) {
 360                                         phases.push_back(compile_glsl_program(this_phase_inputs, this_phase_effects));
 361                                 }
 362                                 return;
 363                         }
 364                         this_phase_inputs.insert(this_phase_inputs.end(), deps.begin(), deps.end());
 365                 }
 366                 this_phase_effects.push_back(node);
 367                 completed_effects->insert(node);
 368
 369                 // Find all the effects that use this one as a direct input.
 370                 if (outgoing_links.count(node) == 0) {
 371                         // End of the line; output.
 372                         phases.push_back(compile_glsl_program(this_phase_inputs, this_phase_effects));
 373                         return;
 374                 }
 375
 376                 std::vector<Effect *> next = outgoing_links[node];
 377                 assert(!next.empty());
 378                 if (next.size() > 1) {
 379                         if (node->num_inputs() != 0) {
 380                                 // More than one effect uses this as the input, and it is not a texture itself.
 381                                 // The easiest thing to do (and probably also the safest
 382                                 // performance-wise in most cases) is to bounce it to a texture
 383                                 // and then let the next passes read from that.
 384                                 phases.push_back(compile_glsl_program(this_phase_inputs, this_phase_effects));
 385                         }
 386
 387                         // Start phases for all the effects that need us (in arbitrary order).
 388                         for (unsigned i = 0; i < next.size(); ++i) {
 389                                 construct_glsl_programs(next[i], completed_effects);
 390                         }
 391                         return;
 392                 }
 393
 394                 // OK, only one effect uses this as the input. Keep iterating,
 395                 // but first see if it requires a texture bounce; if so, give it
 396                 // one by starting a new phase.
 397                 node = next[0];
 398                 if (node->needs_texture_bounce()) {
 399                         phases.push_back(compile_glsl_program(this_phase_inputs, this_phase_effects));
 400                         this_phase_inputs.clear();
 401                         this_phase_effects.clear();
 402                 }
 403         }
 404 }
 405
 406 void EffectChain::finalize()
 407 {
 408         // Add normalizers to get the output format right.
 409         assert(output_gamma_curve.count(last_added_effect()) != 0);
 410         assert(output_color_space.count(last_added_effect()) != 0);
 411         ColorSpace current_color_space = output_color_space[last_added_effect()];  // FIXME
 412         if (current_color_space != output_format.color_space) {
 413                 ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
 414                 colorspace_conversion->set_int("source_space", current_color_space);
 415                 colorspace_conversion->set_int("destination_space", output_format.color_space);
 416                 std::vector<Effect *> inputs;
 417                 inputs.push_back(last_added_effect());
 418                 colorspace_conversion->add_self_to_effect_chain(this, inputs);
 419                 output_color_space[colorspace_conversion] = output_format.color_space;
 420         }
 421         GammaCurve current_gamma_curve = output_gamma_curve[last_added_effect()];  // FIXME
 422         if (current_gamma_curve != output_format.gamma_curve) {
 423                 if (current_gamma_curve != GAMMA_LINEAR) {
 424                         normalize_to_linear_gamma(last_added_effect());  // FIXME
 425                 }
 426                 assert(current_gamma_curve == GAMMA_LINEAR);
 427                 GammaCompressionEffect *gamma_conversion = new GammaCompressionEffect();
 428                 gamma_conversion->set_int("destination_curve", output_format.gamma_curve);
 429                 std::vector<Effect *> inputs;
 430                 inputs.push_back(last_added_effect());
 431                 gamma_conversion->add_self_to_effect_chain(this, inputs);
 432                 output_gamma_curve[gamma_conversion] = output_format.gamma_curve;
 433         }
 434
 435         // Construct all needed GLSL programs, starting at the inputs.
 436         std::set<Effect *> completed_effects;
 437         for (unsigned i = 0; i < inputs.size(); ++i) {
 438                 construct_glsl_programs(inputs[i], &completed_effects);
 439         }
 440
 441         // If we have more than one phase, we need intermediate render-to-texture.
 442         // Construct an FBO, and then as many textures as we need.
 443         // We choose the simplest option of having one texture per output,
 444         // since otherwise this turns into an (albeit simple)
 445         // register allocation problem.
 446         if (phases.size() > 1) {
 447                 glGenFramebuffers(1, &fbo);
 448
 449                 for (unsigned i = 0; i < phases.size() - 1; ++i) {
 450                         Effect *output_effect = phases[i].effects.back();
 451                         GLuint temp_texture;
 452                         glGenTextures(1, &temp_texture);
 453                         check_error();
 454                         glBindTexture(GL_TEXTURE_2D, temp_texture);
 455                         check_error();
 456                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 457                         check_error();
 458                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 459                         check_error();
 460                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 461                         check_error();
 462                         effect_output_textures.insert(std::make_pair(output_effect, temp_texture));
 463                 }
 464         }
 465
 466         for (unsigned i = 0; i < inputs.size(); ++i) {
 467                 inputs[i]->finalize();
 468         }
 469
 470         finalized = true;
 471 }
 472
 473 void EffectChain::render_to_screen()
 474 {
 475         assert(finalized);
 476
 477         // Basic state.
 478         glDisable(GL_BLEND);
 479         check_error();
 480         glDisable(GL_DEPTH_TEST);
 481         check_error();
 482         glDepthMask(GL_FALSE);
 483         check_error();
 484
 485         glMatrixMode(GL_PROJECTION);
 486         glLoadIdentity();
 487         glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0);
 488
 489         glMatrixMode(GL_MODELVIEW);
 490         glLoadIdentity();
 491
 492         if (phases.size() > 1) {
 493                 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 494                 check_error();
 495         }
 496
 497         std::set<Effect *> generated_mipmaps;
 498         for (unsigned i = 0; i < inputs.size(); ++i) {
 499                 // Inputs generate their own mipmaps if they need to
 500                 // (see input.cpp).
 501                 generated_mipmaps.insert(inputs[i]);
 502         }
 503
 504         for (unsigned phase = 0; phase < phases.size(); ++phase) {
 505                 glUseProgram(phases[phase].glsl_program_num);
 506                 check_error();
 507
 508                 // Set up RTT inputs for this phase.
 509                 for (unsigned sampler = 0; sampler < phases[phase].inputs.size(); ++sampler) {
 510                         glActiveTexture(GL_TEXTURE0 + sampler);
 511                         Effect *input = phases[phase].inputs[sampler];
 512                         assert(effect_output_textures.count(input) != 0);
 513                         glBindTexture(GL_TEXTURE_2D, effect_output_textures[input]);
 514                         check_error();
 515                         if (phases[phase].input_needs_mipmaps) {
 516                                 if (generated_mipmaps.count(input) == 0) {
 517                                         glGenerateMipmap(GL_TEXTURE_2D);
 518                                         check_error();
 519                                         generated_mipmaps.insert(input);
 520                                 }
 521                                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
 522                                 check_error();
 523                         } else {
 524                                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 525                                 check_error();
 526                         }
 527
 528                         assert(effect_ids.count(input));
 529                         std::string texture_name = std::string("tex_") + effect_ids[input];
 530                         glUniform1i(glGetUniformLocation(phases[phase].glsl_program_num, texture_name.c_str()), sampler);
 531                         check_error();
 532                 }
 533
 534                 // And now the output.
 535                 if (phase == phases.size() - 1) {
 536                         // Last phase goes directly to the screen.
 537                         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 538                         check_error();
 539                 } else {
 540                         Effect *last_effect = phases[phase].effects.back();
 541                         assert(effect_output_textures.count(last_effect) != 0);
 542                         glFramebufferTexture2D(
 543                                 GL_FRAMEBUFFER,
 544                                 GL_COLOR_ATTACHMENT0,
 545                                 GL_TEXTURE_2D,
 546                                 effect_output_textures[last_effect],
 547                                 0);
 548                         check_error();
 549                 }
 550
 551                 // Give the required parameters to all the effects.
 552                 unsigned sampler_num = phases[phase].inputs.size();
 553                 for (unsigned i = 0; i < phases[phase].effects.size(); ++i) {
 554                         Effect *effect = phases[phase].effects[i];
 555                         effect->set_gl_state(phases[phase].glsl_program_num, effect_ids[effect], &sampler_num);
 556                 }
 557
 558                 // Now draw!
 559                 glBegin(GL_QUADS);
 560
 561                 glTexCoord2f(0.0f, 0.0f);
 562                 glVertex2f(0.0f, 0.0f);
 563
 564                 glTexCoord2f(1.0f, 0.0f);
 565                 glVertex2f(1.0f, 0.0f);
 566
 567                 glTexCoord2f(1.0f, 1.0f);
 568                 glVertex2f(1.0f, 1.0f);
 569
 570                 glTexCoord2f(0.0f, 1.0f);
 571                 glVertex2f(0.0f, 1.0f);
 572
 573                 glEnd();
 574                 check_error();
 575
 576                 for (unsigned i = 0; i < phases[phase].effects.size(); ++i) {
 577                         Effect *effect = phases[phase].effects[i];
 578                         effect->clear_gl_state();
 579                 }
 580         }
 581 }