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
  10 #include "glew.h"
  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         : program_freelist_max_length(program_freelist_max_length),
  23           texture_freelist_max_bytes(texture_freelist_max_bytes),
  24           fbo_freelist_max_length(fbo_freelist_max_length),
  25           texture_freelist_bytes(0)
  26 {
  27         pthread_mutex_init(&lock, NULL);
  28 }
  29
  30 ResourcePool::~ResourcePool()
  31 {
  32         assert(program_refcount.empty());
  33
  34         for (list<GLuint>::const_iterator freelist_it = program_freelist.begin();
  35              freelist_it != program_freelist.end();
  36              ++freelist_it) {
  37                 delete_program(*freelist_it);
  38         }
  39         assert(programs.empty());
  40         assert(program_shaders.empty());
  41
  42         for (list<GLuint>::const_iterator freelist_it = texture_freelist.begin();
  43              freelist_it != texture_freelist.end();
  44              ++freelist_it) {
  45                 GLuint free_texture_num = *freelist_it;
  46                 assert(texture_formats.count(free_texture_num) != 0);
  47                 texture_freelist_bytes -= estimate_texture_size(texture_formats[free_texture_num]);
  48                 texture_formats.erase(free_texture_num);
  49                 glDeleteTextures(1, &free_texture_num);
  50                 check_error();
  51         }
  52         assert(texture_formats.empty());
  53         assert(texture_freelist_bytes == 0);
  54
  55         void *context = get_gl_context_identifier();
  56         cleanup_unlinked_fbos(context);
  57
  58         for (map<void *, std::list<GLuint> >::iterator context_it = fbo_freelist.begin();
  59              context_it != fbo_freelist.end();
  60              ++context_it) {
  61                 if (context_it->first != context) {
  62                         // If this does not hold, the client should have called clean_context() earlier.
  63                         assert(context_it->second.empty());
  64                         continue;
  65                 }
  66                 for (list<GLuint>::const_iterator freelist_it = context_it->second.begin();
  67                      freelist_it != context_it->second.end();
  68                      ++freelist_it) {
  69                         pair<void *, GLuint> key(context, *freelist_it);
  70                         GLuint free_fbo_num = *freelist_it;
  71                         assert(fbo_formats.count(key) != 0);
  72                         fbo_formats.erase(key);
  73                         glDeleteFramebuffers(1, &free_fbo_num);
  74                         check_error();
  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         glDeleteProgram(glsl_program_num);
  95
  96         map<GLuint, pair<GLuint, GLuint> >::iterator shader_it =
  97                 program_shaders.find(glsl_program_num);
  98         assert(shader_it != program_shaders.end());
  99
 100         glDeleteShader(shader_it->second.first);
 101         glDeleteShader(shader_it->second.second);
 102         program_shaders.erase(shader_it);
 103 }
 104
 105 GLuint ResourcePool::compile_glsl_program(const string& vertex_shader, const string& fragment_shader)
 106 {
 107         GLuint glsl_program_num;
 108         pthread_mutex_lock(&lock);
 109         const pair<string, string> key(vertex_shader, fragment_shader);
 110         if (programs.count(key)) {
 111                 // Already in the cache. Increment the refcount, or take it off the freelist
 112                 // if it's zero.
 113                 glsl_program_num = programs[key];
 114                 map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
 115                 if (refcount_it != program_refcount.end()) {
 116                         ++refcount_it->second;
 117                 } else {
 118                         list<GLuint>::iterator freelist_it =
 119                                 find(program_freelist.begin(), program_freelist.end(), glsl_program_num);
 120                         assert(freelist_it != program_freelist.end());
 121                         program_freelist.erase(freelist_it);
 122                         program_refcount.insert(make_pair(glsl_program_num, 1));
 123                 }
 124         } else {
 125                 // Not in the cache. Compile the shaders.
 126                 glsl_program_num = glCreateProgram();
 127                 GLuint vs_obj = compile_shader(vertex_shader, GL_VERTEX_SHADER);
 128                 GLuint fs_obj = compile_shader(fragment_shader, GL_FRAGMENT_SHADER);
 129                 glAttachShader(glsl_program_num, vs_obj);
 130                 check_error();
 131                 glAttachShader(glsl_program_num, fs_obj);
 132                 check_error();
 133                 glLinkProgram(glsl_program_num);
 134                 check_error();
 135
 136                 GLint success;
 137                 glGetProgramiv(glsl_program_num, GL_LINK_STATUS, &success);
 138                 if (success == GL_FALSE) {
 139                         GLchar error_log[1024] = {0};
 140                         glGetProgramInfoLog(glsl_program_num, 1024, NULL, error_log);
 141                         fprintf(stderr, "Error linking program: %s\n", error_log);
 142                         exit(1);
 143                 }
 144
 145                 if (movit_debug_level == MOVIT_DEBUG_ON) {
 146                         // Output shader to a temporary file, for easier debugging.
 147                         static int compiled_shader_num = 0;
 148                         char filename[256];
 149                         sprintf(filename, "chain-%03d.frag", compiled_shader_num++);
 150                         FILE *fp = fopen(filename, "w");
 151                         if (fp == NULL) {
 152                                 perror(filename);
 153                                 exit(1);
 154                         }
 155                         fprintf(fp, "%s\n", fragment_shader.c_str());
 156                         fclose(fp);
 157                 }
 158
 159                 programs.insert(make_pair(key, glsl_program_num));
 160                 program_refcount.insert(make_pair(glsl_program_num, 1));
 161                 program_shaders.insert(make_pair(glsl_program_num, make_pair(vs_obj, fs_obj)));
 162         }
 163         pthread_mutex_unlock(&lock);
 164         return glsl_program_num;
 165 }
 166
 167 void ResourcePool::release_glsl_program(GLuint glsl_program_num)
 168 {
 169         pthread_mutex_lock(&lock);
 170         map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
 171         assert(refcount_it != program_refcount.end());
 172
 173         if (--refcount_it->second == 0) {
 174                 program_refcount.erase(refcount_it);
 175                 assert(find(program_freelist.begin(), program_freelist.end(), glsl_program_num)
 176                         == program_freelist.end());
 177                 program_freelist.push_front(glsl_program_num);
 178                 if (program_freelist.size() > program_freelist_max_length) {
 179                         delete_program(program_freelist.back());
 180                         program_freelist.pop_back();
 181                 }
 182         }
 183
 184         pthread_mutex_unlock(&lock);
 185 }
 186
 187 GLuint ResourcePool::create_2d_texture(GLint internal_format, GLsizei width, GLsizei height)
 188 {
 189         pthread_mutex_lock(&lock);
 190         // See if there's a texture on the freelist we can use.
 191         for (list<GLuint>::iterator freelist_it = texture_freelist.begin();
 192              freelist_it != texture_freelist.end();
 193              ++freelist_it) {
 194                 GLuint texture_num = *freelist_it;
 195                 map<GLuint, Texture2D>::const_iterator format_it = texture_formats.find(texture_num);
 196                 assert(format_it != texture_formats.end());
 197                 if (format_it->second.internal_format == internal_format &&
 198                     format_it->second.width == width &&
 199                     format_it->second.height == height) {
 200                         texture_freelist_bytes -= estimate_texture_size(format_it->second);
 201                         texture_freelist.erase(freelist_it);
 202                         pthread_mutex_unlock(&lock);
 203                         return texture_num;
 204                 }
 205         }
 206
 207         // Find any reasonable format given the internal format; OpenGL validates it
 208         // even though we give NULL as pointer.
 209         GLenum format;
 210         switch (internal_format) {
 211         case GL_RGBA32F_ARB:
 212         case GL_RGBA16F_ARB:
 213         case GL_RGBA8:
 214         case GL_SRGB8_ALPHA8:
 215                 format = GL_RGBA;
 216                 break;
 217         case GL_RGB32F_ARB:
 218         case GL_RGB16F_ARB:
 219         case GL_RGB8:
 220         case GL_SRGB8:
 221                 format = GL_RGB;
 222                 break;
 223         case GL_RG32F:
 224         case GL_RG16F:
 225                 format = GL_RG;
 226                 break;
 227         case GL_R8:
 228                 format = GL_RED;
 229                 break;
 230         default:
 231                 // TODO: Add more here as needed.
 232                 assert(false);
 233         }
 234
 235         GLuint texture_num;
 236         glGenTextures(1, &texture_num);
 237         check_error();
 238         glBindTexture(GL_TEXTURE_2D, texture_num);
 239         check_error();
 240         glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, GL_UNSIGNED_BYTE, NULL);
 241         check_error();
 242         glBindTexture(GL_TEXTURE_2D, 0);
 243         check_error();
 244
 245         Texture2D texture_format;
 246         texture_format.internal_format = internal_format;
 247         texture_format.width = width;
 248         texture_format.height = height;
 249         assert(texture_formats.count(texture_num) == 0);
 250         texture_formats.insert(make_pair(texture_num, texture_format));
 251
 252         pthread_mutex_unlock(&lock);
 253         return texture_num;
 254 }
 255
 256 void ResourcePool::release_2d_texture(GLuint texture_num)
 257 {
 258         pthread_mutex_lock(&lock);
 259         texture_freelist.push_front(texture_num);
 260         assert(texture_formats.count(texture_num) != 0);
 261         texture_freelist_bytes += estimate_texture_size(texture_formats[texture_num]);
 262
 263         while (texture_freelist_bytes > texture_freelist_max_bytes) {
 264                 GLuint free_texture_num = texture_freelist.front();
 265                 texture_freelist.pop_front();
 266                 assert(texture_formats.count(free_texture_num) != 0);
 267                 texture_freelist_bytes -= estimate_texture_size(texture_formats[free_texture_num]);
 268                 texture_formats.erase(free_texture_num);
 269                 glDeleteTextures(1, &free_texture_num);
 270                 check_error();
 271
 272                 // Unlink any lingering FBO related to this texture. We might
 273                 // not be in the right context, so don't delete it right away;
 274                 // the cleanup in release_fbo() (which calls cleanup_unlinked_fbos())
 275                 // will take care of actually doing that later.
 276                 for (map<pair<void *, GLuint>, FBO>::iterator format_it = fbo_formats.begin();
 277                      format_it != fbo_formats.end();
 278                      ++format_it) {
 279                         if (format_it->second.texture_num == free_texture_num) {
 280                                 format_it->second.texture_num = 0;
 281                         }
 282                 }
 283         }
 284         pthread_mutex_unlock(&lock);
 285 }
 286
 287 GLuint ResourcePool::create_fbo(GLuint texture_num)
 288 {
 289         void *context = get_gl_context_identifier();
 290
 291         pthread_mutex_lock(&lock);
 292         if (fbo_freelist.count(context) != 0) {
 293                 // See if there's an FBO on the freelist we can use.
 294                 for (list<GLuint>::iterator freelist_it = fbo_freelist[context].begin();
 295                      freelist_it != fbo_freelist[context].end();
 296                      ++freelist_it) {
 297                         GLuint fbo_num = *freelist_it;
 298                         map<pair<void *, GLuint>, FBO>::const_iterator format_it =
 299                                 fbo_formats.find(make_pair(context, fbo_num));
 300                         assert(format_it != fbo_formats.end());
 301                         if (format_it->second.texture_num == texture_num) {
 302                                 fbo_freelist[context].erase(freelist_it);
 303                                 pthread_mutex_unlock(&lock);
 304                                 return fbo_num;
 305                         }
 306                 }
 307         }
 308
 309         // Create a new one.
 310         GLuint fbo_num;
 311         glGenFramebuffers(1, &fbo_num);
 312         check_error();
 313         glBindFramebuffer(GL_FRAMEBUFFER, fbo_num);
 314         check_error();
 315         glFramebufferTexture2D(
 316                 GL_FRAMEBUFFER,
 317                 GL_COLOR_ATTACHMENT0,
 318                 GL_TEXTURE_2D,
 319                 texture_num,
 320                 0);
 321         check_error();
 322         GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
 323         assert(status == GL_FRAMEBUFFER_COMPLETE);
 324         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 325         check_error();
 326
 327         FBO fbo_format;
 328         fbo_format.texture_num = texture_num;
 329         pair<void *, GLuint> key(context, fbo_num);
 330         assert(fbo_formats.count(key) == 0);
 331         fbo_formats.insert(make_pair(key, fbo_format));
 332
 333         pthread_mutex_unlock(&lock);
 334         return fbo_num;
 335 }
 336
 337 void ResourcePool::release_fbo(GLuint fbo_num)
 338 {
 339         void *context = get_gl_context_identifier();
 340
 341         pthread_mutex_lock(&lock);
 342         fbo_freelist[context].push_front(fbo_num);
 343         assert(fbo_formats.count(make_pair(context, fbo_num)) != 0);
 344
 345         // Now that we're in this context, free up any FBOs that are connected
 346         // to deleted textures (in release_2d_texture).
 347         cleanup_unlinked_fbos(context);
 348
 349         shrink_fbo_freelist(context, fbo_freelist_max_length);
 350         pthread_mutex_unlock(&lock);
 351 }
 352
 353 void ResourcePool::clean_context()
 354 {
 355         void *context = get_gl_context_identifier();
 356
 357         // Currently, we only need to worry about FBOs, as they are the only
 358         // non-shareable resource we hold.
 359         shrink_fbo_freelist(context, 0);
 360         fbo_freelist.erase(context);
 361 }
 362
 363 void ResourcePool::cleanup_unlinked_fbos(void *context)
 364 {
 365         for (list<GLuint>::iterator freelist_it = fbo_freelist[context].begin();
 366              freelist_it != fbo_freelist[context].end(); ) {
 367                 GLuint fbo_num = *freelist_it;
 368                 pair<void *, GLuint> key(context, fbo_num);
 369                 assert(fbo_formats.count(key) != 0);
 370                 if (fbo_formats[key].texture_num == 0) {
 371                         glDeleteFramebuffers(1, &fbo_num);
 372                         check_error();
 373                         fbo_freelist[context].erase(freelist_it++);
 374                 } else {
 375                         freelist_it++;
 376                 }
 377         }
 378 }
 379
 380 void ResourcePool::shrink_fbo_freelist(void *context, size_t max_length)
 381 {
 382         while (fbo_freelist[context].size() > max_length) {
 383                 GLuint free_fbo_num = fbo_freelist[context].back();
 384                 pair<void *, GLuint> key(context, free_fbo_num);
 385                 fbo_freelist[context].pop_back();
 386                 assert(fbo_formats.count(key) != 0);
 387                 fbo_formats.erase(key);
 388                 glDeleteFramebuffers(1, &free_fbo_num);
 389                 check_error();
 390         }
 391 }
 392
 393 size_t ResourcePool::estimate_texture_size(const Texture2D &texture_format)
 394 {
 395         size_t bytes_per_pixel;
 396
 397         switch (texture_format.internal_format) {
 398         case GL_RGBA32F_ARB:
 399                 bytes_per_pixel = 16;
 400                 break;
 401         case GL_RGBA16F_ARB:
 402                 bytes_per_pixel = 8;
 403                 break;
 404         case GL_RGBA8:
 405         case GL_SRGB8_ALPHA8:
 406                 bytes_per_pixel = 4;
 407                 break;
 408         case GL_RGB32F_ARB:
 409                 bytes_per_pixel = 12;
 410                 break;
 411         case GL_RGB16F_ARB:
 412                 bytes_per_pixel = 6;
 413                 break;
 414         case GL_RGB8:
 415         case GL_SRGB8:
 416                 bytes_per_pixel = 3;
 417                 break;
 418         case GL_RG32F:
 419                 bytes_per_pixel = 8;
 420                 break;
 421         case GL_RG16F:
 422                 bytes_per_pixel = 4;
 423                 break;
 424         case GL_R8:
 425                 bytes_per_pixel = 1;
 426                 break;
 427         default:
 428                 // TODO: Add more here as needed.
 429                 assert(false);
 430         }
 431
 432         return texture_format.width * texture_format.height * bytes_per_pixel;
 433 }
 434
 435 }  // namespace movit