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