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         for (list<GLuint>::const_iterator freelist_it = fbo_freelist.begin();
  56              freelist_it != fbo_freelist.end();
  57              ++freelist_it) {
  58                 GLuint free_fbo_num = *freelist_it;
  59                 assert(fbo_formats.count(free_fbo_num) != 0);
  60                 fbo_formats.erase(free_fbo_num);
  61                 // TODO: We currently leak due to FBO sharability issues.
  62                 // glDeleteFramebuffers(1, &free_fbo_num);
  63                 // check_error();
  64         }
  65         assert(fbo_formats.empty());
  66 }
  67
  68 void ResourcePool::delete_program(GLuint glsl_program_num)
  69 {
  70         bool found_program = false;
  71         for (map<pair<string, string>, GLuint>::iterator program_it = programs.begin();
  72              program_it != programs.end();
  73              ++program_it) {
  74                 if (program_it->second == glsl_program_num) {
  75                         programs.erase(program_it);
  76                         found_program = true;
  77                         break;
  78                 }
  79         }
  80         assert(found_program);
  81         glDeleteProgram(glsl_program_num);
  82
  83         map<GLuint, pair<GLuint, GLuint> >::iterator shader_it =
  84                 program_shaders.find(glsl_program_num);
  85         assert(shader_it != program_shaders.end());
  86
  87         glDeleteShader(shader_it->second.first);
  88         glDeleteShader(shader_it->second.second);
  89         program_shaders.erase(shader_it);
  90 }
  91
  92 GLuint ResourcePool::compile_glsl_program(const string& vertex_shader, const string& fragment_shader)
  93 {
  94         GLuint glsl_program_num;
  95         pthread_mutex_lock(&lock);
  96         const pair<string, string> key(vertex_shader, fragment_shader);
  97         if (programs.count(key)) {
  98                 // Already in the cache. Increment the refcount, or take it off the freelist
  99                 // if it's zero.
 100                 glsl_program_num = programs[key];
 101                 map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
 102                 if (refcount_it != program_refcount.end()) {
 103                         ++refcount_it->second;
 104                 } else {
 105                         list<GLuint>::iterator freelist_it =
 106                                 find(program_freelist.begin(), program_freelist.end(), glsl_program_num);
 107                         assert(freelist_it != program_freelist.end());
 108                         program_freelist.erase(freelist_it);
 109                         program_refcount.insert(make_pair(glsl_program_num, 1));
 110                 }
 111         } else {
 112                 // Not in the cache. Compile the shaders.
 113                 glsl_program_num = glCreateProgram();
 114                 GLuint vs_obj = compile_shader(vertex_shader, GL_VERTEX_SHADER);
 115                 GLuint fs_obj = compile_shader(fragment_shader, GL_FRAGMENT_SHADER);
 116                 glAttachShader(glsl_program_num, vs_obj);
 117                 check_error();
 118                 glAttachShader(glsl_program_num, fs_obj);
 119                 check_error();
 120                 glLinkProgram(glsl_program_num);
 121                 check_error();
 122
 123                 GLint success;
 124                 glGetProgramiv(glsl_program_num, GL_LINK_STATUS, &success);
 125                 if (success == GL_FALSE) {
 126                         GLchar error_log[1024] = {0};
 127                         glGetProgramInfoLog(glsl_program_num, 1024, NULL, error_log);
 128                         fprintf(stderr, "Error linking program: %s\n", error_log);
 129                         exit(1);
 130                 }
 131
 132                 if (movit_debug_level == MOVIT_DEBUG_ON) {
 133                         // Output shader to a temporary file, for easier debugging.
 134                         static int compiled_shader_num = 0;
 135                         char filename[256];
 136                         sprintf(filename, "chain-%03d.frag", compiled_shader_num++);
 137                         FILE *fp = fopen(filename, "w");
 138                         if (fp == NULL) {
 139                                 perror(filename);
 140                                 exit(1);
 141                         }
 142                         fprintf(fp, "%s\n", fragment_shader.c_str());
 143                         fclose(fp);
 144                 }
 145
 146                 programs.insert(make_pair(key, glsl_program_num));
 147                 program_refcount.insert(make_pair(glsl_program_num, 1));
 148                 program_shaders.insert(make_pair(glsl_program_num, make_pair(vs_obj, fs_obj)));
 149         }
 150         pthread_mutex_unlock(&lock);
 151         return glsl_program_num;
 152 }
 153
 154 void ResourcePool::release_glsl_program(GLuint glsl_program_num)
 155 {
 156         pthread_mutex_lock(&lock);
 157         map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
 158         assert(refcount_it != program_refcount.end());
 159
 160         if (--refcount_it->second == 0) {
 161                 program_refcount.erase(refcount_it);
 162                 assert(find(program_freelist.begin(), program_freelist.end(), glsl_program_num)
 163                         == program_freelist.end());
 164                 program_freelist.push_front(glsl_program_num);
 165                 if (program_freelist.size() > program_freelist_max_length) {
 166                         delete_program(program_freelist.back());
 167                         program_freelist.pop_back();
 168                 }
 169         }
 170
 171         pthread_mutex_unlock(&lock);
 172 }
 173
 174 GLuint ResourcePool::create_2d_texture(GLint internal_format, GLsizei width, GLsizei height)
 175 {
 176         pthread_mutex_lock(&lock);
 177         // See if there's a texture on the freelist we can use.
 178         for (list<GLuint>::iterator freelist_it = texture_freelist.begin();
 179              freelist_it != texture_freelist.end();
 180              ++freelist_it) {
 181                 GLuint texture_num = *freelist_it;
 182                 map<GLuint, Texture2D>::const_iterator format_it = texture_formats.find(texture_num);
 183                 assert(format_it != texture_formats.end());
 184                 if (format_it->second.internal_format == internal_format &&
 185                     format_it->second.width == width &&
 186                     format_it->second.height == height) {
 187                         texture_freelist_bytes -= estimate_texture_size(format_it->second);
 188                         texture_freelist.erase(freelist_it);
 189                         pthread_mutex_unlock(&lock);
 190                         return texture_num;
 191                 }
 192         }
 193
 194         // Find any reasonable format given the internal format; OpenGL validates it
 195         // even though we give NULL as pointer.
 196         GLenum format;
 197         switch (internal_format) {
 198         case GL_RGBA32F_ARB:
 199         case GL_RGBA16F_ARB:
 200         case GL_RGBA8:
 201         case GL_SRGB8_ALPHA8:
 202                 format = GL_RGBA;
 203                 break;
 204         case GL_RGB32F_ARB:
 205         case GL_RGB16F_ARB:
 206         case GL_RGB8:
 207         case GL_SRGB8:
 208                 format = GL_RGB;
 209                 break;
 210         case GL_RG32F:
 211         case GL_RG16F:
 212                 format = GL_RG;
 213                 break;
 214         case GL_R8:
 215                 format = GL_RED;
 216                 break;
 217         default:
 218                 // TODO: Add more here as needed.
 219                 assert(false);
 220         }
 221
 222         GLuint texture_num;
 223         glGenTextures(1, &texture_num);
 224         check_error();
 225         glBindTexture(GL_TEXTURE_2D, texture_num);
 226         check_error();
 227         glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, GL_UNSIGNED_BYTE, NULL);
 228         check_error();
 229         glBindTexture(GL_TEXTURE_2D, 0);
 230         check_error();
 231
 232         Texture2D texture_format;
 233         texture_format.internal_format = internal_format;
 234         texture_format.width = width;
 235         texture_format.height = height;
 236         assert(texture_formats.count(texture_num) == 0);
 237         texture_formats.insert(make_pair(texture_num, texture_format));
 238
 239         pthread_mutex_unlock(&lock);
 240         return texture_num;
 241 }
 242
 243 void ResourcePool::release_2d_texture(GLuint texture_num)
 244 {
 245         pthread_mutex_lock(&lock);
 246         texture_freelist.push_front(texture_num);
 247         assert(texture_formats.count(texture_num) != 0);
 248         texture_freelist_bytes += estimate_texture_size(texture_formats[texture_num]);
 249
 250         while (texture_freelist_bytes > texture_freelist_max_bytes) {
 251                 GLuint free_texture_num = texture_freelist.front();
 252                 texture_freelist.pop_front();
 253                 assert(texture_formats.count(free_texture_num) != 0);
 254                 texture_freelist_bytes -= estimate_texture_size(texture_formats[free_texture_num]);
 255                 texture_formats.erase(free_texture_num);
 256                 glDeleteTextures(1, &free_texture_num);
 257                 check_error();
 258
 259                 // Delete any FBO related to this texture.
 260                 for (list<GLuint>::iterator fbo_freelist_it = fbo_freelist.begin();
 261                      fbo_freelist_it != fbo_freelist.end(); ) {
 262                         GLuint fbo_num = *fbo_freelist_it;
 263                         map<GLuint, FBO>::const_iterator format_it = fbo_formats.find(fbo_num);
 264                         assert(format_it != fbo_formats.end());
 265                         if (format_it->second.texture_num == free_texture_num) {
 266                                 fbo_formats.erase(fbo_num);
 267                                 // TODO: We currently leak due to FBO sharability issues.
 268                                 // glDeleteFramebuffers(1, &fbo_num);
 269                                 fbo_freelist.erase(fbo_freelist_it++);
 270                         } else {
 271                                 ++fbo_freelist_it;
 272                         }
 273                 }
 274         }
 275         pthread_mutex_unlock(&lock);
 276 }
 277
 278 GLuint ResourcePool::create_fbo(void *context, GLuint texture_num)
 279 {
 280         pthread_mutex_lock(&lock);
 281         // See if there's an FBO on the freelist we can use.
 282         for (list<GLuint>::iterator freelist_it = fbo_freelist.begin();
 283              freelist_it != fbo_freelist.end();
 284              ++freelist_it) {
 285                 GLuint fbo_num = *freelist_it;
 286                 map<GLuint, FBO>::const_iterator format_it = fbo_formats.find(fbo_num);
 287                 assert(format_it != fbo_formats.end());
 288                 if (format_it->second.context == context &&
 289                     format_it->second.texture_num == texture_num) {
 290                         fbo_freelist.erase(freelist_it);
 291                         pthread_mutex_unlock(&lock);
 292                         return fbo_num;
 293                 }
 294         }
 295
 296         // Create a new one.
 297         GLuint fbo_num;
 298         glGenFramebuffers(1, &fbo_num);
 299         check_error();
 300         glBindFramebuffer(GL_FRAMEBUFFER, fbo_num);
 301         check_error();
 302         glFramebufferTexture2D(
 303                 GL_FRAMEBUFFER,
 304                 GL_COLOR_ATTACHMENT0,
 305                 GL_TEXTURE_2D,
 306                 texture_num,
 307                 0);
 308         check_error();
 309         GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
 310         assert(status == GL_FRAMEBUFFER_COMPLETE);
 311         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 312         check_error();
 313
 314         FBO fbo_format;
 315         fbo_format.context = context;
 316         fbo_format.texture_num = texture_num;
 317         assert(fbo_formats.count(fbo_num) == 0);
 318         fbo_formats.insert(make_pair(fbo_num, fbo_format));
 319
 320         pthread_mutex_unlock(&lock);
 321         return fbo_num;
 322 }
 323
 324 void ResourcePool::release_fbo(GLuint fbo_num)
 325 {
 326         pthread_mutex_lock(&lock);
 327         fbo_freelist.push_front(fbo_num);
 328         assert(fbo_formats.count(fbo_num) != 0);
 329
 330         while (fbo_freelist.size() > fbo_freelist_max_length) {
 331                 GLuint free_fbo_num = fbo_freelist.front();
 332                 fbo_freelist.pop_front();
 333                 assert(fbo_formats.count(free_fbo_num) != 0);
 334                 fbo_formats.erase(free_fbo_num);
 335                 // TODO: We currently leak due to FBO sharability issues.
 336                 // glDeleteFramebuffers(1, &free_fbo_num);
 337                 // check_error();
 338         }
 339         pthread_mutex_unlock(&lock);
 340 }
 341
 342 size_t ResourcePool::estimate_texture_size(const Texture2D &texture_format)
 343 {
 344         size_t bytes_per_pixel;
 345
 346         switch (texture_format.internal_format) {
 347         case GL_RGBA32F_ARB:
 348                 bytes_per_pixel = 16;
 349                 break;
 350         case GL_RGBA16F_ARB:
 351                 bytes_per_pixel = 8;
 352                 break;
 353         case GL_RGBA8:
 354         case GL_SRGB8_ALPHA8:
 355                 bytes_per_pixel = 4;
 356                 break;
 357         case GL_RGB32F_ARB:
 358                 bytes_per_pixel = 12;
 359                 break;
 360         case GL_RGB16F_ARB:
 361                 bytes_per_pixel = 6;
 362                 break;
 363         case GL_RGB8:
 364         case GL_SRGB8:
 365                 bytes_per_pixel = 3;
 366                 break;
 367         case GL_RG32F:
 368                 bytes_per_pixel = 8;
 369                 break;
 370         case GL_RG16F:
 371                 bytes_per_pixel = 4;
 372                 break;
 373         case GL_R8:
 374                 bytes_per_pixel = 1;
 375                 break;
 376         default:
 377                 // TODO: Add more here as needed.
 378                 assert(false);
 379         }
 380
 381         return texture_format.width * texture_format.height * bytes_per_pixel;
 382 }
 383
 384 }  // namespace movit