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

   1 #include "resource_pool.h"
   2
   3 #include <stdio.h>
   4 #include <pthread.h>
   5
   6 #include <algorithm>
   7 #include <map>
   8 #include <string>
   9 #include <utility>
  10
  11 #include "init.h"
  12 #include "util.h"
  13
  14 using namespace std;
  15
  16 ResourcePool::ResourcePool(size_t program_freelist_max_length,
  17                            size_t texture_freelist_max_bytes)
  18         : program_freelist_max_length(program_freelist_max_length),
  19           texture_freelist_max_bytes(texture_freelist_max_bytes),
  20           texture_freelist_bytes(0) {
  21         pthread_mutex_init(&lock, NULL);
  22 }
  23
  24 ResourcePool::~ResourcePool()
  25 {
  26         assert(program_refcount.empty());
  27
  28         for (list<GLuint>::const_iterator freelist_it = program_freelist.begin();
  29              freelist_it != program_freelist.end();
  30              ++freelist_it) {
  31                 delete_program(*freelist_it);
  32         }
  33         assert(programs.empty());
  34         assert(program_shaders.empty());
  35
  36         for (list<GLuint>::const_iterator freelist_it = texture_freelist.begin();
  37              freelist_it != texture_freelist.end();
  38              ++freelist_it) {
  39                 GLuint free_texture_num = program_freelist.front();
  40                 program_freelist.pop_front();
  41                 assert(texture_formats.count(free_texture_num) != 0);
  42                 texture_freelist_bytes -= estimate_texture_size(texture_formats[free_texture_num]);
  43                 texture_formats.erase(free_texture_num);
  44                 glDeleteTextures(1, &free_texture_num);
  45                 check_error();
  46         }
  47         assert(texture_formats.empty());
  48         assert(texture_freelist_bytes == 0);
  49 }
  50
  51 void ResourcePool::delete_program(GLuint glsl_program_num)
  52 {
  53         bool found_program = false;
  54         for (std::map<std::pair<std::string, std::string>, GLuint>::iterator program_it = programs.begin();
  55              program_it != programs.end();
  56              ++program_it) {
  57                 if (program_it->second == glsl_program_num) {
  58                         programs.erase(program_it);
  59                         found_program = true;
  60                         break;
  61                 }
  62         }
  63         assert(found_program);
  64         glDeleteProgram(glsl_program_num);
  65
  66         std::map<GLuint, std::pair<GLuint, GLuint> >::iterator shader_it =
  67                 program_shaders.find(glsl_program_num);
  68         assert(shader_it != program_shaders.end());
  69
  70         glDeleteShader(shader_it->second.first);
  71         glDeleteShader(shader_it->second.second);
  72         program_shaders.erase(shader_it);
  73 }
  74
  75 GLuint ResourcePool::compile_glsl_program(const string& vertex_shader, const string& fragment_shader)
  76 {
  77         GLuint glsl_program_num;
  78         pthread_mutex_lock(&lock);
  79         const pair<string, string> key(vertex_shader, fragment_shader);
  80         if (programs.count(key)) {
  81                 // Already in the cache. Increment the refcount, or take it off the freelist
  82                 // if it's zero.
  83                 glsl_program_num = programs[key];
  84                 map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
  85                 if (refcount_it != program_refcount.end()) {
  86                         ++refcount_it->second;
  87                 } else {
  88                         list<GLuint>::iterator freelist_it =
  89                                 find(program_freelist.begin(), program_freelist.end(), glsl_program_num);
  90                         assert(freelist_it != program_freelist.end());
  91                         program_freelist.erase(freelist_it);
  92                         program_refcount.insert(make_pair(glsl_program_num, 1));
  93                 }
  94         } else {
  95                 // Not in the cache. Compile the shaders.
  96                 glsl_program_num = glCreateProgram();
  97                 GLuint vs_obj = compile_shader(vertex_shader, GL_VERTEX_SHADER);
  98                 GLuint fs_obj = compile_shader(fragment_shader, GL_FRAGMENT_SHADER);
  99                 glAttachShader(glsl_program_num, vs_obj);
 100                 check_error();
 101                 glAttachShader(glsl_program_num, fs_obj);
 102                 check_error();
 103                 glLinkProgram(glsl_program_num);
 104                 check_error();
 105
 106                 if (movit_debug_level == MOVIT_DEBUG_ON) {
 107                         // Output shader to a temporary file, for easier debugging.
 108                         static int compiled_shader_num = 0;
 109                         char filename[256];
 110                         sprintf(filename, "chain-%03d.frag", compiled_shader_num++);
 111                         FILE *fp = fopen(filename, "w");
 112                         if (fp == NULL) {
 113                                 perror(filename);
 114                                 exit(1);
 115                         }
 116                         fprintf(fp, "%s\n", fragment_shader.c_str());
 117                         fclose(fp);
 118                 }
 119
 120                 programs.insert(make_pair(key, glsl_program_num));
 121                 program_refcount.insert(make_pair(glsl_program_num, 1));
 122                 program_shaders.insert(make_pair(glsl_program_num, make_pair(vs_obj, fs_obj)));
 123         }
 124         pthread_mutex_unlock(&lock);
 125         return glsl_program_num;
 126 }
 127
 128 void ResourcePool::release_glsl_program(GLuint glsl_program_num)
 129 {
 130         pthread_mutex_lock(&lock);
 131         map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
 132         assert(refcount_it != program_refcount.end());
 133
 134         if (--refcount_it->second == 0) {
 135                 program_refcount.erase(refcount_it);
 136                 assert(find(program_freelist.begin(), program_freelist.end(), glsl_program_num)
 137                         == program_freelist.end());
 138                 program_freelist.push_front(glsl_program_num);
 139                 if (program_freelist.size() > program_freelist_max_length) {
 140                         delete_program(program_freelist.back());
 141                         program_freelist.pop_back();
 142                 }
 143         }
 144
 145         pthread_mutex_unlock(&lock);
 146 }
 147
 148 GLuint ResourcePool::create_2d_texture(GLint internal_format, GLsizei width, GLsizei height)
 149 {
 150         pthread_mutex_lock(&lock);
 151         // See if there's a texture on the freelist we can use.
 152         for (list<GLuint>::iterator freelist_it = texture_freelist.begin();
 153              freelist_it != texture_freelist.end();
 154              ++freelist_it) {
 155                 GLuint texture_num = *freelist_it;
 156                 map<GLuint, Texture2D>::const_iterator format_it = texture_formats.find(texture_num);
 157                 assert(format_it != texture_formats.end());
 158                 if (format_it->second.internal_format == internal_format &&
 159                     format_it->second.width == width &&
 160                     format_it->second.height == height) {
 161                         texture_freelist_bytes -= estimate_texture_size(format_it->second);
 162                         texture_freelist.erase(freelist_it);
 163                         pthread_mutex_unlock(&lock);
 164                         return texture_num;
 165                 }
 166         }
 167
 168         // Find any reasonable format given the internal format; OpenGL validates it
 169         // even though we give NULL as pointer.
 170         GLenum format;
 171         switch (internal_format) {
 172         case GL_RGBA32F_ARB:
 173         case GL_RGBA16F_ARB:
 174         case GL_RGBA8:
 175         case GL_SRGB8_ALPHA8:
 176                 format = GL_RGBA;
 177                 break;
 178         case GL_RG32F:
 179         case GL_RG16F:
 180                 format = GL_RG;
 181                 break;
 182         case GL_LUMINANCE8:
 183                 format = GL_LUMINANCE;
 184                 break;
 185         default:
 186                 // TODO: Add more here as needed.
 187                 assert(false);
 188         }
 189
 190         GLuint texture_num;
 191         glGenTextures(1, &texture_num);
 192         check_error();
 193         glBindTexture(GL_TEXTURE_2D, texture_num);
 194         check_error();
 195         glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, GL_UNSIGNED_BYTE, NULL);
 196         check_error();
 197         glBindTexture(GL_TEXTURE_2D, 0);
 198         check_error();
 199
 200         Texture2D texture_format;
 201         texture_format.internal_format = internal_format;
 202         texture_format.width = width;
 203         texture_format.height = height;
 204         assert(texture_formats.count(texture_num) == 0);
 205         texture_formats.insert(make_pair(texture_num, texture_format));
 206
 207         pthread_mutex_unlock(&lock);
 208         return texture_num;
 209 }
 210
 211 void ResourcePool::release_2d_texture(GLuint texture_num)
 212 {
 213         pthread_mutex_lock(&lock);
 214         texture_freelist.push_front(texture_num);
 215         assert(texture_formats.count(texture_num) != 0);
 216         texture_freelist_bytes += estimate_texture_size(texture_formats[texture_num]);
 217
 218         while (texture_freelist_bytes > texture_freelist_max_bytes) {
 219                 GLuint free_texture_num = texture_freelist.front();
 220                 texture_freelist.pop_front();
 221                 assert(texture_formats.count(free_texture_num) != 0);
 222                 texture_freelist_bytes -= estimate_texture_size(texture_formats[free_texture_num]);
 223                 texture_formats.erase(free_texture_num);
 224                 glDeleteTextures(1, &free_texture_num);
 225                 check_error();
 226         }
 227         pthread_mutex_unlock(&lock);
 228 }
 229
 230 size_t ResourcePool::estimate_texture_size(const Texture2D &texture_format)
 231 {
 232         size_t bytes_per_pixel;
 233
 234         switch (texture_format.internal_format) {
 235         case GL_RGBA32F_ARB:
 236                 bytes_per_pixel = 16;
 237                 break;
 238         case GL_RGBA16F_ARB:
 239                 bytes_per_pixel = 8;
 240                 break;
 241         case GL_RGBA8:
 242         case GL_SRGB8_ALPHA8:
 243                 bytes_per_pixel = 4;
 244                 break;
 245         case GL_RG32F:
 246                 bytes_per_pixel = 8;
 247                 break;
 248         case GL_RG16F:
 249                 bytes_per_pixel = 4;
 250                 break;
 251         case GL_LUMINANCE8:
 252                 bytes_per_pixel = 1;
 253                 break;
 254         default:
 255                 // TODO: Add more here as needed.
 256                 assert(false);
 257         }
 258
 259         return texture_format.width * texture_format.height * bytes_per_pixel;
 260 }