X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=resource_pool.h;h=7029fbfd5e795cbd405a099ddd0b1450ccf187c2;hp=50e0da2c1207755c29c8eee56ec373d141c3275a;hb=refs%2Fheads%2Fepoxy;hpb=4536fdf7952df0d8773c9bf3014fa25a50ca8ecf

diff --git a/resource_pool.h b/resource_pool.h
index 50e0da2..7029fbf 100644
--- a/resource_pool.h
+++ b/resource_pool.h
@@ -16,12 +16,15 @@
 // safely called from multiple threads at the same time, provided they have
 // separate (but sharing) OpenGL contexts.
 
+#include <epoxy/gl.h>
+#include <pthread.h>
+#include <stddef.h>
 #include <list>
 #include <map>
 #include <string>
 #include <utility>
-#include <GL/glew.h>
-#include <pthread.h>
+
+namespace movit {
 
 class ResourcePool {
 public:
@@ -37,7 +40,8 @@ public:
 	// This means you should be prepared for actual memory usage of the freelist being
 	// twice this estimate or more.
 	ResourcePool(size_t program_freelist_max_length = 100,
-	             size_t texture_freelist_max_bytes = 100 << 20);  // 100 MB.
+	             size_t texture_freelist_max_bytes = 100 << 20,  // 100 MB.
+	             size_t fbo_freelist_max_length = 100);
 	~ResourcePool();
 
 	// All remaining functions are intended for calls from EffectChain only.
@@ -53,11 +57,23 @@ public:
 	// or fetch a previous used if possible. Unbinds GL_TEXTURE_2D afterwards.
 	// Keeps ownership of the texture; you must call release_2d_texture() instead
 	// of deleting it when you no longer want it.
-	//
-	// Note: Currently we do not actually have a freelist, but this will change soon.
 	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,
+	// 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. You can get an appropriate context
+	// pointer from get_gl_context_identifier().
+	//
+	// NOTE: In principle, the FBO doesn't have a resolution or pixel format;
+	// you can bind almost whatever texture you want to it. However, changing
+	// textures can have an adverse effect on performance due to validation,
+	// in particular on NVidia cards. Also, keep in mind that FBOs are not
+	// shareable across contexts.
+	GLuint create_fbo(void *context, GLuint texture_num);
+	void release_fbo(GLuint fbo_num);
+
 private:
 	// Delete the given program and both its shaders.
 	void delete_program(GLuint program_num);
@@ -65,7 +81,7 @@ private:
 	// Protects all the other elements in the class.
 	pthread_mutex_t lock;
 
-	size_t program_freelist_max_length, texture_freelist_max_bytes;
+	size_t program_freelist_max_length, texture_freelist_max_bytes, fbo_freelist_max_length;
 		
 	// A mapping from vertex/fragment shader source strings to compiled program number.
 	std::map<std::pair<std::string, std::string>, GLuint> programs;
@@ -101,8 +117,25 @@ private:
 	std::list<GLuint> texture_freelist;
 	size_t texture_freelist_bytes;
 
+	struct FBO {
+		void *context;
+		GLuint texture_num;
+	};
+
+	// 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<GLuint, FBO> fbo_formats;
+
+	// A list of all FBOs that are release but not freed (most recently freed
+	// first). Once this reaches <fbo_freelist_max_length>, the last element
+	// will be deleted.
+	std::list<GLuint> fbo_freelist;
+
 	// See the caveats at the constructor.
 	static size_t estimate_texture_size(const Texture2D &texture_format);
 };
 
+}  // namespace movit
+
 #endif  // !defined(_MOVIT_RESOURCE_POOL_H)