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

   1 #include <assert.h>
   2 #include <pthread.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <algorithm>
   6 #include <map>
   7 #include <string>
   8 #include <utility>
   9 #include <epoxy/gl.h>
  10
  11 #include "init.h"
  12 #include "resource_pool.h"
  13 #include "util.h"
  14
  15 using namespace std;
  16
  17 namespace movit {
  18
  19 ResourcePool::ResourcePool(size_t program_freelist_max_length,
  20                            size_t texture_freelist_max_bytes,
  21                            size_t fbo_freelist_max_length,
  22                            size_t vao_freelist_max_length)
  23         : program_freelist_max_length(program_freelist_max_length),
  24           texture_freelist_max_bytes(texture_freelist_max_bytes),
  25           fbo_freelist_max_length(fbo_freelist_max_length),
  26           vao_freelist_max_length(vao_freelist_max_length),
  27           texture_freelist_bytes(0)
  28 {
  29         pthread_mutex_init(&lock, NULL);
  30 }
  31
  32 ResourcePool::~ResourcePool()
  33 {
  34         assert(program_refcount.empty());
  35
  36         for (list<GLuint>::const_iterator freelist_it = program_freelist.begin();
  37              freelist_it != program_freelist.end();
  38              ++freelist_it) {
  39                 delete_program(*freelist_it);
  40         }
  41         assert(programs.empty());
  42         assert(program_shaders.empty());
  43
  44         for (list<GLuint>::const_iterator freelist_it = texture_freelist.begin();
  45              freelist_it != texture_freelist.end();
  46              ++freelist_it) {
  47                 GLuint free_texture_num = *freelist_it;
  48                 assert(texture_formats.count(free_texture_num) != 0);
  49                 texture_freelist_bytes -= estimate_texture_size(texture_formats[free_texture_num]);
  50                 texture_formats.erase(free_texture_num);
  51                 glDeleteTextures(1, &free_texture_num);
  52                 check_error();
  53         }
  54         assert(texture_formats.empty());
  55         assert(texture_freelist_bytes == 0);
  56
  57         void *context = get_gl_context_identifier();
  58         cleanup_unlinked_fbos(context);
  59
  60         for (map<void *, std::list<FBOFormatIterator> >::iterator context_it = fbo_freelist.begin();
  61              context_it != fbo_freelist.end();
  62              ++context_it) {
  63                 if (context_it->first != context) {
  64                         // If this does not hold, the client should have called clean_context() earlier.
  65                         assert(context_it->second.empty());
  66                         continue;
  67                 }
  68                 for (list<FBOFormatIterator>::const_iterator freelist_it = context_it->second.begin();
  69                      freelist_it != context_it->second.end();
  70                      ++freelist_it) {
  71                         FBOFormatIterator fbo_it = *freelist_it;
  72                         glDeleteFramebuffers(1, &fbo_it->second.fbo_num);
  73                         check_error();
  74                         fbo_formats.erase(fbo_it);
  75                 }
  76         }
  77
  78         assert(fbo_formats.empty());
  79 }
  80
  81 void ResourcePool::delete_program(GLuint glsl_program_num)
  82 {
  83         bool found_program = false;
  84         for (map<pair<string, string>, GLuint>::iterator program_it = programs.begin();
  85              program_it != programs.end();
  86              ++program_it) {
  87                 if (program_it->second == glsl_program_num) {
  88                         programs.erase(program_it);
  89                         found_program = true;
  90                         break;
  91                 }
  92         }
  93         assert(found_program);
  94
  95         map<GLuint, stack<GLuint> >::iterator instance_list_it = program_instances.find(glsl_program_num);
  96         assert(instance_list_it != program_instances.end());
  97
  98         while (!instance_list_it->second.empty()) {
  99                 GLuint instance_program_num = instance_list_it->second.top();
 100                 instance_list_it->second.pop();
 101                 glDeleteProgram(instance_program_num);
 102                 program_masters.erase(instance_program_num);
 103         }
 104         program_instances.erase(instance_list_it);
 105
 106         map<GLuint, ShaderSpec>::iterator shader_it =
 107                 program_shaders.find(glsl_program_num);
 108         assert(shader_it != program_shaders.end());
 109
 110         glDeleteShader(shader_it->second.vs_obj);
 111         glDeleteShader(shader_it->second.fs_obj);
 112         program_shaders.erase(shader_it);
 113 }
 114
 115 GLuint ResourcePool::compile_glsl_program(const string& vertex_shader,
 116                                           const string& fragment_shader,
 117                                           const vector<string>& fragment_shader_outputs)
 118 {
 119         GLuint glsl_program_num;
 120         pthread_mutex_lock(&lock);
 121
 122         // Augment the fragment shader program text with the outputs, so that they become
 123         // part of the key. Also potentially useful for debugging.
 124         string fragment_shader_processed = fragment_shader;
 125         for (unsigned output_index = 0; output_index < fragment_shader_outputs.size(); ++output_index) {
 126                 char buf[256];
 127                 snprintf(buf, sizeof(buf), "// Bound output: %s\n", fragment_shader_outputs[output_index].c_str());
 128                 fragment_shader_processed += buf;
 129         }
 130
 131         const pair<string, string> key(vertex_shader, fragment_shader_processed);
 132         if (programs.count(key)) {
 133                 // Already in the cache. Increment the refcount, or take it off the freelist
 134                 // if it's zero.
 135                 glsl_program_num = programs[key];
 136                 map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
 137                 if (refcount_it != program_refcount.end()) {
 138                         ++refcount_it->second;
 139                 } else {
 140                         list<GLuint>::iterator freelist_it =
 141                                 find(program_freelist.begin(), program_freelist.end(), glsl_program_num);
 142                         assert(freelist_it != program_freelist.end());
 143                         program_freelist.erase(freelist_it);
 144                         program_refcount.insert(make_pair(glsl_program_num, 1));
 145                 }
 146         } else {
 147                 // Not in the cache. Compile the shaders.
 148                 GLuint vs_obj = compile_shader(vertex_shader, GL_VERTEX_SHADER);
 149                 check_error();
 150                 GLuint fs_obj = compile_shader(fragment_shader_processed, GL_FRAGMENT_SHADER);
 151                 check_error();
 152                 glsl_program_num = link_program(vs_obj, fs_obj, fragment_shader_outputs);
 153
 154                 if (movit_debug_level == MOVIT_DEBUG_ON) {
 155                         // Output shader to a temporary file, for easier debugging.
 156                         static int compiled_shader_num = 0;
 157                         char filename[256];
 158                         sprintf(filename, "chain-%03d.frag", compiled_shader_num++);
 159                         FILE *fp = fopen(filename, "w");
 160                         if (fp == NULL) {
 161                                 perror(filename);
 162                                 exit(1);
 163                         }
 164                         fprintf(fp, "%s\n", fragment_shader_processed.c_str());
 165                         fclose(fp);
 166                 }
 167
 168                 programs.insert(make_pair(key, glsl_program_num));
 169                 program_refcount.insert(make_pair(glsl_program_num, 1));
 170                 ShaderSpec spec;
 171                 spec.vs_obj = vs_obj;
 172                 spec.fs_obj = fs_obj;
 173                 spec.fragment_shader_outputs = fragment_shader_outputs;
 174                 program_shaders.insert(make_pair(glsl_program_num, spec));
 175                 stack<GLuint> instances;
 176                 instances.push(glsl_program_num);
 177                 program_instances.insert(make_pair(glsl_program_num, instances));
 178                 program_masters.insert(make_pair(glsl_program_num, glsl_program_num));
 179         }
 180         pthread_mutex_unlock(&lock);
 181         return glsl_program_num;
 182 }
 183
 184 GLuint ResourcePool::link_program(GLuint vs_obj,
 185                                   GLuint fs_obj,
 186                                   const vector<string>& fragment_shader_outputs)
 187 {
 188         GLuint glsl_program_num = glCreateProgram();
 189         check_error();
 190         glAttachShader(glsl_program_num, vs_obj);
 191         check_error();
 192         glAttachShader(glsl_program_num, fs_obj);
 193         check_error();
 194
 195         // Bind the outputs, if we have multiple ones.
 196         if (fragment_shader_outputs.size() > 1) {
 197                 for (unsigned output_index = 0; output_index < fragment_shader_outputs.size(); ++output_index) {
 198                         glBindFragDataLocation(glsl_program_num, output_index,
 199                                                fragment_shader_outputs[output_index].c_str());
 200                 }
 201         }
 202
 203         glLinkProgram(glsl_program_num);
 204         check_error();
 205
 206         GLint success;
 207         glGetProgramiv(glsl_program_num, GL_LINK_STATUS, &success);
 208         if (success == GL_FALSE) {
 209                 GLchar error_log[1024] = {0};
 210                 glGetProgramInfoLog(glsl_program_num, 1024, NULL, error_log);
 211                 fprintf(stderr, "Error linking program: %s\n", error_log);
 212                 exit(1);
 213         }
 214
 215         return glsl_program_num;
 216 }
 217
 218 void ResourcePool::release_glsl_program(GLuint glsl_program_num)
 219 {
 220         pthread_mutex_lock(&lock);
 221         map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
 222         assert(refcount_it != program_refcount.end());
 223
 224         if (--refcount_it->second == 0) {
 225                 program_refcount.erase(refcount_it);
 226                 assert(find(program_freelist.begin(), program_freelist.end(), glsl_program_num)
 227                         == program_freelist.end());
 228                 program_freelist.push_front(glsl_program_num);
 229                 if (program_freelist.size() > program_freelist_max_length) {
 230                         delete_program(program_freelist.back());
 231                         program_freelist.pop_back();
 232                 }
 233         }
 234
 235         pthread_mutex_unlock(&lock);
 236 }
 237
 238 GLuint ResourcePool::use_glsl_program(GLuint glsl_program_num)
 239 {
 240         pthread_mutex_lock(&lock);
 241         assert(program_instances.count(glsl_program_num));
 242         stack<GLuint> &instances = program_instances[glsl_program_num];
 243
 244         GLuint instance_program_num;
 245         if (!instances.empty()) {
 246                 // There's an unused instance of this program; just return it.
 247                 instance_program_num = instances.top();
 248                 instances.pop();
 249         } else {
 250                 // We need to clone this program. (unuse_glsl_program()
 251                 // will later put it onto the list.)
 252                 map<GLuint, ShaderSpec>::iterator shader_it =
 253                         program_shaders.find(glsl_program_num);
 254                 assert(shader_it != program_shaders.end());
 255
 256                 instance_program_num = link_program(
 257                         shader_it->second.vs_obj,
 258                         shader_it->second.fs_obj,
 259                         shader_it->second.fragment_shader_outputs);
 260                 program_masters.insert(make_pair(instance_program_num, glsl_program_num));
 261         }
 262         pthread_mutex_unlock(&lock);
 263
 264         glUseProgram(instance_program_num);
 265         return instance_program_num;
 266 }
 267
 268 void ResourcePool::unuse_glsl_program(GLuint instance_program_num)
 269 {
 270         pthread_mutex_lock(&lock);
 271
 272         map<GLuint, GLuint>::const_iterator master_it = program_masters.find(instance_program_num);
 273         assert(master_it != program_masters.end());
 274
 275         assert(program_instances.count(master_it->second));
 276         stack<GLuint> &instances = program_instances[master_it->second];
 277
 278         instances.push(instance_program_num);
 279
 280         pthread_mutex_unlock(&lock);
 281 }
 282
 283 GLuint ResourcePool::create_2d_texture(GLint internal_format, GLsizei width, GLsizei height)
 284 {
 285         assert(width > 0);
 286         assert(height > 0);
 287
 288         pthread_mutex_lock(&lock);
 289         // See if there's a texture on the freelist we can use.
 290         for (list<GLuint>::iterator freelist_it = texture_freelist.begin();
 291              freelist_it != texture_freelist.end();
 292              ++freelist_it) {
 293                 GLuint texture_num = *freelist_it;
 294                 map<GLuint, Texture2D>::const_iterator format_it = texture_formats.find(texture_num);
 295                 assert(format_it != texture_formats.end());
 296                 if (format_it->second.internal_format == internal_format &&
 297                     format_it->second.width == width &&
 298                     format_it->second.height == height) {
 299                         texture_freelist_bytes -= estimate_texture_size(format_it->second);
 300                         texture_freelist.erase(freelist_it);
 301                         pthread_mutex_unlock(&lock);
 302                         return texture_num;
 303                 }
 304         }
 305
 306         // Find any reasonable format given the internal format; OpenGL validates it
 307         // even though we give NULL as pointer.
 308         GLenum format;
 309         switch (internal_format) {
 310         case GL_RGBA32F_ARB:
 311         case GL_RGBA16F_ARB:
 312         case GL_RGBA16:
 313         case GL_RGBA8:
 314         case GL_RGB10_A2:
 315         case GL_SRGB8_ALPHA8:
 316                 format = GL_RGBA;
 317                 break;
 318         case GL_RGB32F:
 319         case GL_RGB16F:
 320         case GL_RGB16:
 321         case GL_R11F_G11F_B10F:
 322         case GL_RGB8:
 323         case GL_RGB10:
 324         case GL_SRGB8:
 325         case GL_RGB565:
 326         case GL_RGB9_E5:
 327                 format = GL_RGB;
 328                 break;
 329         case GL_RG32F:
 330         case GL_RG16F:
 331         case GL_RG16:
 332         case GL_RG8:
 333                 format = GL_RG;
 334                 break;
 335         case GL_R32F:
 336         case GL_R16F:
 337         case GL_R16:
 338         case GL_R8:
 339                 format = GL_RED;
 340                 break;
 341         default:
 342                 // TODO: Add more here as needed.
 343                 assert(false);
 344         }
 345
 346         // Same with type; GLES is stricter than desktop OpenGL here.
 347         GLenum type;
 348         switch (internal_format) {
 349         case GL_RGBA32F_ARB:
 350         case GL_RGBA16F_ARB:
 351         case GL_RGB32F:
 352         case GL_RGB16F:
 353         case GL_R11F_G11F_B10F:
 354         case GL_RGB9_E5:
 355         case GL_RG32F:
 356         case GL_RG16F:
 357         case GL_R32F:
 358         case GL_R16F:
 359                 type = GL_FLOAT;
 360                 break;
 361         case GL_RGBA16:
 362         case GL_RGB16:
 363         case GL_RG16:
 364         case GL_R16:
 365                 type = GL_UNSIGNED_SHORT;
 366                 break;
 367         case GL_SRGB8_ALPHA8:
 368         case GL_SRGB8:
 369         case GL_RGBA8:
 370         case GL_RGB8:
 371         case GL_RGB10_A2:
 372         case GL_RGB10:
 373         case GL_RG8:
 374         case GL_R8:
 375                 type = GL_UNSIGNED_BYTE;
 376                 break;
 377         case GL_RGB565:
 378                 type = GL_UNSIGNED_SHORT_5_6_5;
 379                 break;
 380         default:
 381                 // TODO: Add more here as needed.
 382                 assert(false);
 383         }
 384
 385
 386         GLuint texture_num;
 387         glGenTextures(1, &texture_num);
 388         check_error();
 389         glBindTexture(GL_TEXTURE_2D, texture_num);
 390         check_error();
 391         glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, type, NULL);
 392         check_error();
 393         glBindTexture(GL_TEXTURE_2D, 0);
 394         check_error();
 395
 396         Texture2D texture_format;
 397         texture_format.internal_format = internal_format;
 398         texture_format.width = width;
 399         texture_format.height = height;
 400         assert(texture_formats.count(texture_num) == 0);
 401         texture_formats.insert(make_pair(texture_num, texture_format));
 402
 403         pthread_mutex_unlock(&lock);
 404         return texture_num;
 405 }
 406
 407 void ResourcePool::release_2d_texture(GLuint texture_num)
 408 {
 409         pthread_mutex_lock(&lock);
 410         texture_freelist.push_front(texture_num);
 411         assert(texture_formats.count(texture_num) != 0);
 412         texture_freelist_bytes += estimate_texture_size(texture_formats[texture_num]);
 413
 414         while (texture_freelist_bytes > texture_freelist_max_bytes) {
 415                 GLuint free_texture_num = texture_freelist.back();
 416                 texture_freelist.pop_back();
 417                 assert(texture_formats.count(free_texture_num) != 0);
 418                 texture_freelist_bytes -= estimate_texture_size(texture_formats[free_texture_num]);
 419                 texture_formats.erase(free_texture_num);
 420                 glDeleteTextures(1, &free_texture_num);
 421                 check_error();
 422
 423                 // Unlink any lingering FBO related to this texture. We might
 424                 // not be in the right context, so don't delete it right away;
 425                 // the cleanup in release_fbo() (which calls cleanup_unlinked_fbos())
 426                 // will take care of actually doing that later.
 427                 for (map<pair<void *, GLuint>, FBO>::iterator format_it = fbo_formats.begin();
 428                      format_it != fbo_formats.end();
 429                      ++format_it) {
 430                         for (unsigned i = 0; i < num_fbo_attachments; ++i) {
 431                                 if (format_it->second.texture_num[i] == free_texture_num) {
 432                                         format_it->second.texture_num[i] = GL_INVALID_INDEX;
 433                                 }
 434                         }
 435                 }
 436         }
 437         pthread_mutex_unlock(&lock);
 438 }
 439
 440 GLuint ResourcePool::create_fbo(GLuint texture0_num, GLuint texture1_num, GLuint texture2_num, GLuint texture3_num)
 441 {
 442         void *context = get_gl_context_identifier();
 443
 444         // Make sure we are filled from the bottom.
 445         assert(texture0_num != 0);
 446         if (texture1_num == 0) {
 447                 assert(texture2_num == 0);
 448         }
 449         if (texture2_num == 0) {
 450                 assert(texture3_num == 0);
 451         }
 452
 453         pthread_mutex_lock(&lock);
 454         if (fbo_freelist.count(context) != 0) {
 455                 // See if there's an FBO on the freelist we can use.
 456                 list<FBOFormatIterator>::iterator end = fbo_freelist[context].end();
 457                 for (list<FBOFormatIterator>::iterator freelist_it = fbo_freelist[context].begin();
 458                      freelist_it != end; ++freelist_it) {
 459                         FBOFormatIterator fbo_it = *freelist_it;
 460                         if (fbo_it->second.texture_num[0] == texture0_num &&
 461                             fbo_it->second.texture_num[1] == texture1_num &&
 462                             fbo_it->second.texture_num[2] == texture2_num &&
 463                             fbo_it->second.texture_num[3] == texture3_num) {
 464                                 fbo_freelist[context].erase(freelist_it);
 465                                 pthread_mutex_unlock(&lock);
 466                                 return fbo_it->second.fbo_num;
 467                         }
 468                 }
 469         }
 470
 471         // Create a new one.
 472         FBO fbo_format;
 473         fbo_format.texture_num[0] = texture0_num;
 474         fbo_format.texture_num[1] = texture1_num;
 475         fbo_format.texture_num[2] = texture2_num;
 476         fbo_format.texture_num[3] = texture3_num;
 477
 478         glGenFramebuffers(1, &fbo_format.fbo_num);
 479         check_error();
 480         glBindFramebuffer(GL_FRAMEBUFFER, fbo_format.fbo_num);
 481         check_error();
 482
 483         GLenum bufs[num_fbo_attachments];
 484         unsigned num_active_attachments = 0;
 485         for (unsigned i = 0; i < num_fbo_attachments; ++i, ++num_active_attachments) {
 486                 if (fbo_format.texture_num[i] == 0) {
 487                         break;
 488                 }
 489                 glFramebufferTexture2D(
 490                         GL_FRAMEBUFFER,
 491                         GL_COLOR_ATTACHMENT0 + i,
 492                         GL_TEXTURE_2D,
 493                         fbo_format.texture_num[i],
 494                         0);
 495                 check_error();
 496                 bufs[i] = GL_COLOR_ATTACHMENT0 + i;
 497         }
 498
 499         glDrawBuffers(num_active_attachments, bufs);
 500         check_error();
 501
 502         GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
 503         assert(status == GL_FRAMEBUFFER_COMPLETE);
 504         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 505         check_error();
 506
 507         pair<void *, GLuint> key(context, fbo_format.fbo_num);
 508         assert(fbo_formats.count(key) == 0);
 509         fbo_formats.insert(make_pair(key, fbo_format));
 510
 511         pthread_mutex_unlock(&lock);
 512         return fbo_format.fbo_num;
 513 }
 514
 515 void ResourcePool::release_fbo(GLuint fbo_num)
 516 {
 517         void *context = get_gl_context_identifier();
 518
 519         pthread_mutex_lock(&lock);
 520         FBOFormatIterator fbo_it = fbo_formats.find(make_pair(context, fbo_num));
 521         assert(fbo_it != fbo_formats.end());
 522         fbo_freelist[context].push_front(fbo_it);
 523
 524         // Now that we're in this context, free up any FBOs that are connected
 525         // to deleted textures (in release_2d_texture).
 526         cleanup_unlinked_fbos(context);
 527
 528         shrink_fbo_freelist(context, fbo_freelist_max_length);
 529         pthread_mutex_unlock(&lock);
 530 }
 531
 532 GLuint ResourcePool::create_vec2_vao(const set<GLint> &attribute_indices, GLuint vbo_num)
 533 {
 534         void *context = get_gl_context_identifier();
 535
 536         pthread_mutex_lock(&lock);
 537         if (vao_freelist.count(context) != 0) {
 538                 // See if there's a VAO the freelist we can use.
 539                 list<VAOFormatIterator>::iterator end = vao_freelist[context].end();
 540                 for (list<VAOFormatIterator>::iterator freelist_it = vao_freelist[context].begin();
 541                      freelist_it != end; ++freelist_it) {
 542                         VAOFormatIterator vao_it = *freelist_it;
 543                         if (vao_it->second.vbo_num == vbo_num &&
 544                             vao_it->second.attribute_indices == attribute_indices) {
 545                                 vao_freelist[context].erase(freelist_it);
 546                                 pthread_mutex_unlock(&lock);
 547                                 return vao_it->second.vao_num;
 548                         }
 549                 }
 550         }
 551
 552         // Create a new one.
 553         VAO vao_format;
 554         vao_format.attribute_indices = attribute_indices;
 555         vao_format.vbo_num = vbo_num;
 556
 557         glGenVertexArrays(1, &vao_format.vao_num);
 558         check_error();
 559         glBindVertexArray(vao_format.vao_num);
 560         check_error();
 561         glBindBuffer(GL_ARRAY_BUFFER, vbo_num);
 562         check_error();
 563
 564         for (set<GLint>::const_iterator attr_it = attribute_indices.begin(); attr_it != attribute_indices.end(); ++attr_it) {
 565                 glEnableVertexAttribArray(*attr_it);
 566                 check_error();
 567                 glVertexAttribPointer(*attr_it, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
 568                 check_error();
 569         }
 570
 571         glBindVertexArray(0);
 572         check_error();
 573         glBindBuffer(GL_ARRAY_BUFFER, 0);
 574         check_error();
 575
 576         pair<void *, GLuint> key(context, vao_format.vao_num);
 577         assert(vao_formats.count(key) == 0);
 578         vao_formats.insert(make_pair(key, vao_format));
 579
 580         pthread_mutex_unlock(&lock);
 581         return vao_format.vao_num;
 582 }
 583
 584 void ResourcePool::release_vec2_vao(GLuint vao_num)
 585 {
 586         void *context = get_gl_context_identifier();
 587
 588         pthread_mutex_lock(&lock);
 589         VAOFormatIterator vao_it = vao_formats.find(make_pair(context, vao_num));
 590         assert(vao_it != vao_formats.end());
 591         vao_freelist[context].push_front(vao_it);
 592
 593         shrink_vao_freelist(context, vao_freelist_max_length);
 594         pthread_mutex_unlock(&lock);
 595 }
 596
 597 void ResourcePool::clean_context()
 598 {
 599         void *context = get_gl_context_identifier();
 600
 601         // Currently, we only need to worry about FBOs and VAOs, as they are the only
 602         // non-shareable resources we hold.
 603         shrink_fbo_freelist(context, 0);
 604         fbo_freelist.erase(context);
 605
 606         shrink_vao_freelist(context, 0);
 607         vao_freelist.erase(context);
 608 }
 609
 610 void ResourcePool::cleanup_unlinked_fbos(void *context)
 611 {
 612         list<FBOFormatIterator>::iterator end = fbo_freelist[context].end();
 613         for (list<FBOFormatIterator>::iterator freelist_it = fbo_freelist[context].begin(); freelist_it != end; ) {
 614                 FBOFormatIterator fbo_it = *freelist_it;
 615
 616                 bool all_unlinked = true;
 617                 for (unsigned i = 0; i < num_fbo_attachments; ++i) {
 618                         if (fbo_it->second.texture_num[i] != 0 &&
 619                             fbo_it->second.texture_num[i] != GL_INVALID_INDEX) {
 620                                 all_unlinked = false;
 621                                 break;
 622                         }
 623                 }
 624                 if (all_unlinked) {
 625                         glDeleteFramebuffers(1, &fbo_it->second.fbo_num);
 626                         check_error();
 627                         fbo_formats.erase(fbo_it);
 628                         fbo_freelist[context].erase(freelist_it++);
 629                 } else {
 630                         freelist_it++;
 631                 }
 632         }
 633 }
 634
 635 void ResourcePool::shrink_fbo_freelist(void *context, size_t max_length)
 636 {
 637         list<FBOFormatIterator> &freelist = fbo_freelist[context];
 638         while (freelist.size() > max_length) {
 639                 FBOFormatIterator free_fbo_it = freelist.back();
 640                 glDeleteFramebuffers(1, &free_fbo_it->second.fbo_num);
 641                 check_error();
 642                 fbo_formats.erase(free_fbo_it);
 643                 freelist.pop_back();
 644         }
 645 }
 646
 647 void ResourcePool::shrink_vao_freelist(void *context, size_t max_length)
 648 {
 649         list<VAOFormatIterator> &freelist = vao_freelist[context];
 650         while (freelist.size() > max_length) {
 651                 VAOFormatIterator free_vao_it = freelist.back();
 652                 glDeleteVertexArrays(1, &free_vao_it->second.vao_num);
 653                 check_error();
 654                 vao_formats.erase(free_vao_it);
 655                 freelist.pop_back();
 656         }
 657 }
 658
 659 size_t ResourcePool::estimate_texture_size(const Texture2D &texture_format)
 660 {
 661         size_t bytes_per_pixel;
 662
 663         switch (texture_format.internal_format) {
 664         case GL_RGBA32F_ARB:
 665                 bytes_per_pixel = 16;
 666                 break;
 667         case GL_RGBA16F_ARB:
 668                 bytes_per_pixel = 8;
 669                 break;
 670         case GL_RGB32F_ARB:
 671                 bytes_per_pixel = 12;
 672                 break;
 673         case GL_RGB16F_ARB:
 674                 bytes_per_pixel = 6;
 675                 break;
 676         case GL_R11F_G11F_B10F:
 677                 bytes_per_pixel = 4;
 678                 break;
 679         case GL_RGB9_E5:
 680                 bytes_per_pixel = 4;
 681                 break;
 682         case GL_RGBA8:
 683         case GL_SRGB8_ALPHA8:
 684         case GL_RGB10_A2:
 685         case GL_RGB10:
 686                 bytes_per_pixel = 4;
 687                 break;
 688         case GL_RGB8:
 689         case GL_SRGB8:
 690                 bytes_per_pixel = 3;
 691                 break;
 692         case GL_RG32F:
 693                 bytes_per_pixel = 8;
 694                 break;
 695         case GL_RG16F:
 696                 bytes_per_pixel = 4;
 697                 break;
 698         case GL_R32F:
 699                 bytes_per_pixel = 4;
 700                 break;
 701         case GL_R16F:
 702                 bytes_per_pixel = 2;
 703                 break;
 704         case GL_RG8:
 705                 bytes_per_pixel = 2;
 706                 break;
 707         case GL_R8:
 708                 bytes_per_pixel = 1;
 709                 break;
 710         case GL_RGB565:
 711                 bytes_per_pixel = 2;
 712                 break;
 713         case GL_RGBA16:
 714                 bytes_per_pixel = 8;
 715                 break;
 716         case GL_RGB16:
 717                 bytes_per_pixel = 6;
 718                 break;
 719         case GL_RG16:
 720                 bytes_per_pixel = 4;
 721                 break;
 722         case GL_R16:
 723                 bytes_per_pixel = 2;
 724                 break;
 725         default:
 726                 // TODO: Add more here as needed.
 727                 assert(false);
 728         }
 729
 730         return texture_format.width * texture_format.height * bytes_per_pixel;
 731 }
 732
 733 }  // namespace movit