// ResourcePool explicitly if you delete a context, or they will leak (and the
// ResourcePool destructor will assert-fail). See clean_context().
-#include <GL/glew.h>
+#include <epoxy/gl.h>
#include <pthread.h>
#include <stddef.h>
#include <list>
#include <map>
+#include <stack>
#include <string>
#include <utility>
+#include <vector>
namespace movit {
// compiled program from the cache if possible. Keeps ownership of the
// program; you must call release_glsl_program() instead of deleting it
// when you no longer want it.
- GLuint compile_glsl_program(const std::string& vertex_shader, const std::string& fragment_shader);
+ //
+ // If <fragment_shader_outputs> contains more than one value, the given
+ // outputs will be bound to fragment shader output colors in the order
+ // they appear in the vector. Otherwise, output order is undefined and
+ // determined by the OpenGL driver.
+ GLuint compile_glsl_program(const std::string& vertex_shader,
+ const std::string& fragment_shader,
+ const std::vector<std::string>& frag_shader_outputs);
void release_glsl_program(GLuint glsl_program_num);
+ // Since uniforms belong to the program and not to the context,
+ // a given GLSL program number can't be used by more than one thread
+ // at a time. Thus, if two threads want to use the same program
+ // (usually because two EffectChains share them via caching),
+ // we will need to make a clone. use_glsl_program() makes such
+ // a clone if needed, calls glUseProgram(), and returns the real
+ // program number that was used; this must be given to
+ // unuse_glsl_program() to release it. unuse_glsl_program() does not
+ // actually change any OpenGL state, though.
+ GLuint use_glsl_program(GLuint glsl_program_num);
+ void unuse_glsl_program(GLuint instance_program_num);
+
// Allocate a 2D texture of the given internal format and dimensions,
// or fetch a previous used if possible. Unbinds GL_TEXTURE_2D afterwards.
// Keeps ownership of the texture; you must call release_2d_texture() instead
GLuint create_2d_texture(GLint internal_format, GLsizei width, GLsizei height);
void release_2d_texture(GLuint texture_num);
- // Allocate an FBO with the the given texture bound as a framebuffer attachment,
+ // Allocate an FBO with the the given texture(s) bound as framebuffer attachment(s),
// or fetch a previous used if possible. Unbinds GL_FRAMEBUFFER afterwards.
// Keeps ownership of the FBO; you must call release_fbo() of deleting
// it when you no longer want it.
// in particular on NVidia cards. Also, keep in mind that FBOs are not
// shareable across contexts, so you must have the context that's supposed
// to own the FBO current when you create or release it.
- GLuint create_fbo(GLuint texture_num);
+ GLuint create_fbo(GLuint texture0_num,
+ GLuint texture1_num = 0,
+ GLuint texture2_num = 0,
+ GLuint texture3_num = 0);
void release_fbo(GLuint fbo_num);
// Informs the ResourcePool that the current context is going away soon,
// is no more than <max_length> elements long.
void shrink_fbo_freelist(void *context, size_t max_length);
+ // Link the given vertex and fragment shaders into a full GLSL program.
+ // See compile_glsl_program() for explanation of <fragment_shader_outputs>.
+ static GLuint link_program(GLuint vs_obj,
+ GLuint fs_obj,
+ const std::vector<std::string>& fragment_shader_outputs);
+
// Protects all the other elements in the class.
pthread_mutex_t lock;
std::map<GLuint, int> program_refcount;
// A mapping from program number to vertex and fragment shaders.
- std::map<GLuint, std::pair<GLuint, GLuint> > program_shaders;
+ // Contains everything needed to re-link the program.
+ struct ShaderSpec {
+ GLuint vs_obj, fs_obj;
+ std::vector<std::string> fragment_shader_outputs;
+ };
+ std::map<GLuint, ShaderSpec> program_shaders;
+
+ // For each program, a list of other programs that are exactly like it.
+ // By default, will only contain the program itself, but due to cloning
+ // (see use_glsl_program()), may grow. Programs are taken off this list
+ // while they are in use (by use_glsl_program()).
+ std::map<GLuint, std::stack<GLuint> > program_instances;
+
+ // For each program, the master program that created it
+ // (inverse of program_instances).
+ std::map<GLuint, GLuint> program_masters;
// A list of programs that are no longer in use, most recently freed first.
// Once this reaches <program_freelist_max_length>, the last element
std::list<GLuint> texture_freelist;
size_t texture_freelist_bytes;
+ static const unsigned num_fbo_attachments = 4;
struct FBO {
- GLuint texture_num; // 0 means associated to a texture that has since been deleted.
+ GLuint fbo_num;
+ // GL_INVALID_INDEX means associated to a texture that has since been deleted.
+ // 0 means the output isn't bound.
+ GLuint texture_num[num_fbo_attachments];
};
// For each context, a mapping from FBO number to format details. This is
// filled if the FBO is given out to a client or on the freelist, but
// not if it is deleted from the freelist.
std::map<std::pair<void *, GLuint>, FBO> fbo_formats;
+ typedef std::map<std::pair<void *, GLuint>, FBO>::iterator FBOFormatIterator;
// For each context, a list of all FBOs that are released but not freed
// (most recently freed first). Once this reaches <fbo_freelist_max_length>,
// the last element will be deleted.
- std::map<void *, std::list<GLuint> > fbo_freelist;
+ //
+ // We store iterators directly into <fbo_format> for efficiency.
+ std::map<void *, std::list<FBOFormatIterator> > fbo_freelist;
// See the caveats at the constructor.
static size_t estimate_texture_size(const Texture2D &texture_format);
projects / movit / blobdiff