1 files changed, 19 insertions, 3 deletions
diff --git a/src/core/framebuffer.h b/src/core/framebuffer.h
index 3f03200..78ead0e 100644
--- a/src/core/framebuffer.h
+++ b/src/core/framebuffer.h
@@ -2,15 +2,31 @@
 #define _SOFTSHADEROOM_FRAMEBUFFER_H_
 
 #include "texture.h"
+#include "depth.h"
+#include "stencil.h"
 
 /*frame buffer object*/
 
-typedef Texture RenderTexture;
+#define RENDER_TARGET_COUNT   6
 
+/*
+** OpenGL中fbo的三个挂点可以用renderbuffer或者texture2d绑定，这里考虑效率只提供
+** 8个texture2d可以绑定到color attachment。
+** 如果开启了深度测试或模板测试，那么应该绑定对应的深度缓存和模板缓存
+*/
 typedef struct FrameBuffer{
-	RenderTexture rt;
+	Texture* render_textures[RENDER_TARGET_COUNT]; /*color attachments*/
+	float* depth_buffer; /*depth attachment*/
+	byte* stencil_buffer;  /*stencil attachment*/
 } FrameBuffer;
 
-FrameBuffer* fbo_create(uint height, uint width);
+FrameBuffer* fbo_create();
+
+void fbo_attachrendertexture(FrameBuffer* fb, uint attachment, Texture* rt);
+/*depth buffer和stencil buffer如果传0，绑定到屏幕缓冲区*/
+void fbo_attachdepthbuffer(FrameBuffer* fb, float* depthbuffer);
+void fbo_attachstencilbuffer(FrameBuffer* fb, byte* stencilbuffer);
+
+void fbo_free(FrameBuffer* fb);
 
 #endif
 \ No newline at end of file