moved the FramebufferStrategy structs back to Framebuffer.cpp

2026-08-16 00:02:12 +02:00 · 2010-11-11 13:17:41 -05:00
parent 417c20e6fa
commit 77e5b7f880
2 changed files with 123 additions and 123 deletions
@@ -7,6 +7,129 @@ namespace graphics
 {
 namespace opengl
 {	
+		
+	// strategy for fbo creation, interchangable at runtime:
+	// none, opengl >= 3.0, extensions
+	struct FramebufferStrategy {
+		/// create a new framebuffer, depthbuffer and texture
+		/**
+		 * @param[out] framebuffer Framebuffer name
+		 * @param[out] depthbuffer Depthbuffer name
+		 * @param[out] img         Texture name
+		 * @param[in]  width       Width of framebuffer
+		 * @param[in]  height      Height of framebuffer
+		 * @return Creation status
+		 */
+		virtual GLenum createFBO(GLuint&, GLuint&, GLuint&, int, int)
+		{ return GL_FRAMEBUFFER_UNSUPPORTED; }
+		/// remove objects
+		/**
+		 * @param[in] framebuffer Framebuffer name
+		 * @param[in] depthbuffer Depthbuffer name
+		 * @param[in] img         Texture name
+		 */
+		virtual void deleteFBO(GLuint, GLuint, GLuint) {}
+		virtual void bindFBO(GLuint) {}
+	};
+
+	struct FramebufferStrategyGL3 : public FramebufferStrategy {
+		virtual GLenum createFBO(GLuint& framebuffer, GLuint& depthbuffer, GLuint& img, int width, int height)
+		{
+			// generate depth buffer
+			glGenRenderbuffers(1, &depthbuffer);
+			glBindRenderbuffer(GL_RENDERBUFFER, depthbuffer);
+			glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, width, height);
+			glBindRenderbuffer(GL_RENDERBUFFER, 0);
+
+			// generate texture save target
+			glGenTextures(1, &img);
+			glBindTexture(GL_TEXTURE_2D, img);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height,
+					0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+			glBindTexture(GL_TEXTURE_2D, 0);
+
+			// create framebuffer
+			glGenFramebuffers(1, &framebuffer);
+			glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
+			glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+					GL_TEXTURE_2D, img, 0);
+			glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
+					GL_RENDERBUFFER, depthbuffer);
+			GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+
+			// unbind buffers and texture
+			glBindFramebuffer(GL_FRAMEBUFFER, 0);
+			return status;
+		}
+		virtual void deleteFBO(GLuint framebuffer, GLuint depthbuffer, GLuint img)
+		{
+			glDeleteTextures(1, &img);
+			glDeleteRenderbuffers(1, &depthbuffer);
+			glDeleteFramebuffers(1, &framebuffer);
+		}
+
+		virtual void bindFBO(GLuint framebuffer)
+		{
+			glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
+		}
+	};
+
+	struct FramebufferStrategyEXT : public FramebufferStrategy {
+
+		virtual GLenum createFBO(GLuint& framebuffer, GLuint& depthbuffer, GLuint& img, int width, int height)
+		{
+			// generate depth buffer
+			glGenRenderbuffersEXT(1, &depthbuffer);
+			glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, depthbuffer);
+			glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16, width, height);
+			glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
+
+			// generate texture save target
+			glGenTextures(1, &img);
+			glBindTexture(GL_TEXTURE_2D, img);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height,
+					0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+			glBindTexture(GL_TEXTURE_2D, 0);
+
+			// create framebuffer
+			glGenFramebuffersEXT(1, &framebuffer);
+			glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer);
+			glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+					GL_TEXTURE_2D, img, 0);
+			glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
+					GL_RENDERBUFFER_EXT, depthbuffer);
+			GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+
+			// unbind buffers and texture
+			glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+			return status;
+		}
+
+		virtual void deleteFBO(GLuint framebuffer, GLuint depthbuffer, GLuint img)
+		{
+			glDeleteTextures(1, &img);
+			glDeleteRenderbuffersEXT(1, &depthbuffer);
+			glDeleteFramebuffersEXT(1, &framebuffer);
+		}
+
+		virtual void bindFBO(GLuint framebuffer)
+		{
+			glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer);
+		}
+	};
+	
+	FramebufferStrategy* strategy;
+	
+	FramebufferStrategy strategyNone;
+	
+	FramebufferStrategyGL3 strategyGL3;
+	
+	FramebufferStrategyEXT strategyEXT;
+	
 	Framebuffer* Framebuffer::current = NULL;

 	Framebuffer::Framebuffer(int width, int height) :