12 #include "resource_pool.h"
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)
27 pthread_mutex_init(&lock, NULL);
30 ResourcePool::~ResourcePool()
32 assert(program_refcount.empty());
34 for (list<GLuint>::const_iterator freelist_it = program_freelist.begin();
35 freelist_it != program_freelist.end();
37 delete_program(*freelist_it);
39 assert(programs.empty());
40 assert(program_shaders.empty());
42 for (list<GLuint>::const_iterator freelist_it = texture_freelist.begin();
43 freelist_it != texture_freelist.end();
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);
52 assert(texture_formats.empty());
53 assert(texture_freelist_bytes == 0);
55 void *context = get_gl_context_identifier();
56 cleanup_unlinked_fbos(context);
58 for (map<void *, std::list<GLuint> >::iterator context_it = fbo_freelist.begin();
59 context_it != fbo_freelist.end();
61 if (context_it->first != context) {
62 // If this does not hold, the client should have called clean_context() earlier.
63 assert(context_it->second.empty());
66 for (list<GLuint>::const_iterator freelist_it = context_it->second.begin();
67 freelist_it != context_it->second.end();
69 pair<void *, GLuint> key(context, *freelist_it);
70 GLuint free_fbo_num = *freelist_it;
71 assert(fbo_formats.count(key) != 0);
72 fbo_formats.erase(key);
73 glDeleteFramebuffers(1, &free_fbo_num);
78 assert(fbo_formats.empty());
81 void ResourcePool::delete_program(GLuint glsl_program_num)
83 bool found_program = false;
84 for (map<pair<string, string>, GLuint>::iterator program_it = programs.begin();
85 program_it != programs.end();
87 if (program_it->second == glsl_program_num) {
88 programs.erase(program_it);
93 assert(found_program);
94 glDeleteProgram(glsl_program_num);
96 map<GLuint, pair<GLuint, GLuint> >::iterator shader_it =
97 program_shaders.find(glsl_program_num);
98 assert(shader_it != program_shaders.end());
100 glDeleteShader(shader_it->second.first);
101 glDeleteShader(shader_it->second.second);
102 program_shaders.erase(shader_it);
105 GLuint ResourcePool::compile_glsl_program(const string& vertex_shader, const string& fragment_shader)
107 GLuint glsl_program_num;
108 pthread_mutex_lock(&lock);
109 const pair<string, string> key(vertex_shader, fragment_shader);
110 if (programs.count(key)) {
111 // Already in the cache. Increment the refcount, or take it off the freelist
113 glsl_program_num = programs[key];
114 map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
115 if (refcount_it != program_refcount.end()) {
116 ++refcount_it->second;
118 list<GLuint>::iterator freelist_it =
119 find(program_freelist.begin(), program_freelist.end(), glsl_program_num);
120 assert(freelist_it != program_freelist.end());
121 program_freelist.erase(freelist_it);
122 program_refcount.insert(make_pair(glsl_program_num, 1));
125 // Not in the cache. Compile the shaders.
126 glsl_program_num = glCreateProgram();
127 GLuint vs_obj = compile_shader(vertex_shader, GL_VERTEX_SHADER);
128 GLuint fs_obj = compile_shader(fragment_shader, GL_FRAGMENT_SHADER);
129 glAttachShader(glsl_program_num, vs_obj);
131 glAttachShader(glsl_program_num, fs_obj);
133 glLinkProgram(glsl_program_num);
137 glGetProgramiv(glsl_program_num, GL_LINK_STATUS, &success);
138 if (success == GL_FALSE) {
139 GLchar error_log[1024] = {0};
140 glGetProgramInfoLog(glsl_program_num, 1024, NULL, error_log);
141 fprintf(stderr, "Error linking program: %s\n", error_log);
145 if (movit_debug_level == MOVIT_DEBUG_ON) {
146 // Output shader to a temporary file, for easier debugging.
147 static int compiled_shader_num = 0;
149 sprintf(filename, "chain-%03d.frag", compiled_shader_num++);
150 FILE *fp = fopen(filename, "w");
155 fprintf(fp, "%s\n", fragment_shader.c_str());
159 programs.insert(make_pair(key, glsl_program_num));
160 program_refcount.insert(make_pair(glsl_program_num, 1));
161 program_shaders.insert(make_pair(glsl_program_num, make_pair(vs_obj, fs_obj)));
163 pthread_mutex_unlock(&lock);
164 return glsl_program_num;
167 void ResourcePool::release_glsl_program(GLuint glsl_program_num)
169 pthread_mutex_lock(&lock);
170 map<GLuint, int>::iterator refcount_it = program_refcount.find(glsl_program_num);
171 assert(refcount_it != program_refcount.end());
173 if (--refcount_it->second == 0) {
174 program_refcount.erase(refcount_it);
175 assert(find(program_freelist.begin(), program_freelist.end(), glsl_program_num)
176 == program_freelist.end());
177 program_freelist.push_front(glsl_program_num);
178 if (program_freelist.size() > program_freelist_max_length) {
179 delete_program(program_freelist.back());
180 program_freelist.pop_back();
184 pthread_mutex_unlock(&lock);
187 GLuint ResourcePool::create_2d_texture(GLint internal_format, GLsizei width, GLsizei height)
189 pthread_mutex_lock(&lock);
190 // See if there's a texture on the freelist we can use.
191 for (list<GLuint>::iterator freelist_it = texture_freelist.begin();
192 freelist_it != texture_freelist.end();
194 GLuint texture_num = *freelist_it;
195 map<GLuint, Texture2D>::const_iterator format_it = texture_formats.find(texture_num);
196 assert(format_it != texture_formats.end());
197 if (format_it->second.internal_format == internal_format &&
198 format_it->second.width == width &&
199 format_it->second.height == height) {
200 texture_freelist_bytes -= estimate_texture_size(format_it->second);
201 texture_freelist.erase(freelist_it);
202 pthread_mutex_unlock(&lock);
207 // Find any reasonable format given the internal format; OpenGL validates it
208 // even though we give NULL as pointer.
210 switch (internal_format) {
214 case GL_SRGB8_ALPHA8:
231 // TODO: Add more here as needed.
236 glGenTextures(1, &texture_num);
238 glBindTexture(GL_TEXTURE_2D, texture_num);
240 glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, GL_UNSIGNED_BYTE, NULL);
242 glBindTexture(GL_TEXTURE_2D, 0);
245 Texture2D texture_format;
246 texture_format.internal_format = internal_format;
247 texture_format.width = width;
248 texture_format.height = height;
249 assert(texture_formats.count(texture_num) == 0);
250 texture_formats.insert(make_pair(texture_num, texture_format));
252 pthread_mutex_unlock(&lock);
256 void ResourcePool::release_2d_texture(GLuint texture_num)
258 pthread_mutex_lock(&lock);
259 texture_freelist.push_front(texture_num);
260 assert(texture_formats.count(texture_num) != 0);
261 texture_freelist_bytes += estimate_texture_size(texture_formats[texture_num]);
263 while (texture_freelist_bytes > texture_freelist_max_bytes) {
264 GLuint free_texture_num = texture_freelist.front();
265 texture_freelist.pop_front();
266 assert(texture_formats.count(free_texture_num) != 0);
267 texture_freelist_bytes -= estimate_texture_size(texture_formats[free_texture_num]);
268 texture_formats.erase(free_texture_num);
269 glDeleteTextures(1, &free_texture_num);
272 // Unlink any lingering FBO related to this texture. We might
273 // not be in the right context, so don't delete it right away;
274 // the cleanup in release_fbo() (which calls cleanup_unlinked_fbos())
275 // will take care of actually doing that later.
276 for (map<pair<void *, GLuint>, FBO>::iterator format_it = fbo_formats.begin();
277 format_it != fbo_formats.end();
279 if (format_it->second.texture_num == free_texture_num) {
280 format_it->second.texture_num = 0;
284 pthread_mutex_unlock(&lock);
287 GLuint ResourcePool::create_fbo(GLuint texture_num)
289 void *context = get_gl_context_identifier();
291 pthread_mutex_lock(&lock);
292 if (fbo_freelist.count(context) != 0) {
293 // See if there's an FBO on the freelist we can use.
294 for (list<GLuint>::iterator freelist_it = fbo_freelist[context].begin();
295 freelist_it != fbo_freelist[context].end();
297 GLuint fbo_num = *freelist_it;
298 map<pair<void *, GLuint>, FBO>::const_iterator format_it =
299 fbo_formats.find(make_pair(context, fbo_num));
300 assert(format_it != fbo_formats.end());
301 if (format_it->second.texture_num == texture_num) {
302 fbo_freelist[context].erase(freelist_it);
303 pthread_mutex_unlock(&lock);
311 glGenFramebuffers(1, &fbo_num);
313 glBindFramebuffer(GL_FRAMEBUFFER, fbo_num);
315 glFramebufferTexture2D(
317 GL_COLOR_ATTACHMENT0,
322 GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
323 assert(status == GL_FRAMEBUFFER_COMPLETE);
324 glBindFramebuffer(GL_FRAMEBUFFER, 0);
328 fbo_format.texture_num = texture_num;
329 pair<void *, GLuint> key(context, fbo_num);
330 assert(fbo_formats.count(key) == 0);
331 fbo_formats.insert(make_pair(key, fbo_format));
333 pthread_mutex_unlock(&lock);
337 void ResourcePool::release_fbo(GLuint fbo_num)
339 void *context = get_gl_context_identifier();
341 pthread_mutex_lock(&lock);
342 fbo_freelist[context].push_front(fbo_num);
343 assert(fbo_formats.count(make_pair(context, fbo_num)) != 0);
345 // Now that we're in this context, free up any FBOs that are connected
346 // to deleted textures (in release_2d_texture).
347 cleanup_unlinked_fbos(context);
349 shrink_fbo_freelist(context, fbo_freelist_max_length);
350 pthread_mutex_unlock(&lock);
353 void ResourcePool::clean_context()
355 void *context = get_gl_context_identifier();
357 // Currently, we only need to worry about FBOs, as they are the only
358 // non-shareable resource we hold.
359 shrink_fbo_freelist(context, 0);
360 fbo_freelist.erase(context);
363 void ResourcePool::cleanup_unlinked_fbos(void *context)
365 for (list<GLuint>::iterator freelist_it = fbo_freelist[context].begin();
366 freelist_it != fbo_freelist[context].end(); ) {
367 GLuint fbo_num = *freelist_it;
368 pair<void *, GLuint> key(context, fbo_num);
369 assert(fbo_formats.count(key) != 0);
370 if (fbo_formats[key].texture_num == 0) {
371 glDeleteFramebuffers(1, &fbo_num);
373 fbo_freelist[context].erase(freelist_it++);
380 void ResourcePool::shrink_fbo_freelist(void *context, size_t max_length)
382 while (fbo_freelist[context].size() > max_length) {
383 GLuint free_fbo_num = fbo_freelist[context].back();
384 pair<void *, GLuint> key(context, free_fbo_num);
385 fbo_freelist[context].pop_back();
386 assert(fbo_formats.count(key) != 0);
387 fbo_formats.erase(key);
388 glDeleteFramebuffers(1, &free_fbo_num);
393 size_t ResourcePool::estimate_texture_size(const Texture2D &texture_format)
395 size_t bytes_per_pixel;
397 switch (texture_format.internal_format) {
399 bytes_per_pixel = 16;
405 case GL_SRGB8_ALPHA8:
409 bytes_per_pixel = 12;
428 // TODO: Add more here as needed.
432 return texture_format.width * texture_format.height * bytes_per_pixel;