X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=resource_pool.h;h=5cc2e829e8f836635b04980978372973d3618639;hp=a331f4f1708c823a076216c0023a81cf099bd802;hb=0c821b2eb013de712041d2b337612b9a6297695f;hpb=7ea0b3a5be9bafaa2d1fa5a17ce285a725ce132b

diff --git a/resource_pool.h b/resource_pool.h
index a331f4f..5cc2e82 100644
--- a/resource_pool.h
+++ b/resource_pool.h
@@ -29,6 +29,7 @@
 #include <map>
 #include <string>
 #include <utility>
+#include <vector>
 
 namespace movit {
 
@@ -56,7 +57,14 @@ public:
 	// 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);
 
 	// Allocate a 2D texture of the given internal format and dimensions,
@@ -66,7 +74,7 @@ public:
 	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.
@@ -77,7 +85,10 @@ public:
 	// 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,
@@ -138,19 +149,26 @@ private:
 	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);