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