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         : program_freelist_max_length(program_freelist_max_length) {
  18         pthread_mutex_init(&lock, NULL);
  19 }
  20
  21 ResourcePool::~ResourcePool()
  22 {
  23         assert(program_refcount.empty());
  24
  25         for (list<GLuint>::const_iterator freelist_it = program_freelist.begin();
  26              freelist_it != program_freelist.end();
  27              ++freelist_it) {
  28                 delete_program(*freelist_it);
  29         }
  30         assert(programs.empty());
  31         assert(program_shaders.empty());
  32 }
  33
  34 void ResourcePool::delete_program(GLuint glsl_program_num)
  35 {
  36         bool found_program = false;
  37         for (std::map<std::pair<std::string, std::string>, GLuint>::iterator program_it = programs.begin();
  38              program_it != programs.end();
  39              ++program_it) {
  40                 if (program_it->second == glsl_program_num) {
  41                         programs.erase(program_it);
  42                         found_program = true;
  43                         break;
  44                 }
  45         }
  46         assert(found_program);
  47         glDeleteProgram(glsl_program_num);
  48
  49         std::map<GLuint, std::pair<GLuint, GLuint> >::iterator shader_it =
  50                 program_shaders.find(glsl_program_num);
  51         assert(shader_it != program_shaders.end());
  52
  53         glDeleteShader(shader_it->second.first);
  54         glDeleteShader(shader_it->second.second);
  55         program_shaders.erase(shader_it);
  56 }
  57
  58 GLuint ResourcePool::compile_glsl_program(const string& vertex_shader, const string& fragment_shader)
  59 {
  60         GLuint glsl_program_num;
  61         pthread_mutex_lock(&lock);
  62         const pair<string, string> key(vertex_shader, fragment_shader);
  63         if (programs.count(key)) {
  64                 // Already in the cache. Increment the refcount, or take it off the freelist
  65                 // if it's zero.
  66                 glsl_program_num = programs[key];
  67                 map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
  68                 if (refcount_it != program_refcount.end()) {
  69                         ++refcount_it->second;
  70                 } else {
  71                         list<GLuint>::iterator freelist_it =
  72                                 find(program_freelist.begin(), program_freelist.end(), glsl_program_num);
  73                         assert(freelist_it != program_freelist.end());
  74                         program_freelist.erase(freelist_it);
  75                         program_refcount.insert(make_pair(glsl_program_num, 1));
  76                 }
  77         } else {
  78                 // Not in the cache. Compile the shaders.
  79                 glsl_program_num = glCreateProgram();
  80                 GLuint vs_obj = compile_shader(vertex_shader, GL_VERTEX_SHADER);
  81                 GLuint fs_obj = compile_shader(fragment_shader, GL_FRAGMENT_SHADER);
  82                 glAttachShader(glsl_program_num, vs_obj);
  83                 check_error();
  84                 glAttachShader(glsl_program_num, fs_obj);
  85                 check_error();
  86                 glLinkProgram(glsl_program_num);
  87                 check_error();
  88
  89                 if (movit_debug_level == MOVIT_DEBUG_ON) {
  90                         // Output shader to a temporary file, for easier debugging.
  91                         static int compiled_shader_num = 0;
  92                         char filename[256];
  93                         sprintf(filename, "chain-%03d.frag", compiled_shader_num++);
  94                         FILE *fp = fopen(filename, "w");
  95                         if (fp == NULL) {
  96                                 perror(filename);
  97                                 exit(1);
  98                         }
  99                         fprintf(fp, "%s\n", fragment_shader.c_str());
 100                         fclose(fp);
 101                 }
 102
 103                 programs.insert(make_pair(key, glsl_program_num));
 104                 program_refcount.insert(make_pair(glsl_program_num, 1));
 105                 program_shaders.insert(make_pair(glsl_program_num, make_pair(vs_obj, fs_obj)));
 106         }
 107         pthread_mutex_unlock(&lock);
 108         return glsl_program_num;
 109 }
 110
 111 void ResourcePool::release_glsl_program(GLuint glsl_program_num)
 112 {
 113         pthread_mutex_lock(&lock);
 114         map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
 115         assert(refcount_it != program_refcount.end());
 116
 117         if (--refcount_it->second == 0) {
 118                 program_refcount.erase(refcount_it);
 119                 assert(find(program_freelist.begin(), program_freelist.end(), glsl_program_num)
 120                         == program_freelist.end());
 121                 program_freelist.push_front(glsl_program_num);
 122                 if (program_freelist.size() > program_freelist_max_length) {
 123                         delete_program(program_freelist.back());
 124                         program_freelist.pop_back();
 125                 }
 126         }
 127
 128         pthread_mutex_unlock(&lock);
 129 }