Changeset 2859 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SsaoShader.h

Timestamp:

08/21/08 16:31:03 (16 years ago)

Author:

mattausch

Message:

 

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SsaoShader.h (modified) (2 diffs)

GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SsaoShader.h

@@ -1 @@
-#ifndef _DeferredShader_H__
-#define _DeferredShader_H__
+#ifndef _SsaoShader_H__
+#define _SsaoShader_H__
 
 #include "common.h"
+#include "glInterface.h"
+#include <Cg/cg.h>
+#include <Cg/cgGL.h>
+
 
 namespace CHCDemoEngine 
@@ -9 +13 @@
 class FrameBufferObject;
 
-/** This class implements a deferred shading algorithm.
+
+/** This class implements a deferred shading algorithm that takes
+        a frame buffer object as input and outputs an image in the given size
 */
-class DeferredShader
+class SsaoShader
 {
 public:
-        /** constructor requesting an opengl occlusion query.
+        /** constructor for a deferred shader taking the requested output image size,
+                the exponential smoothing factor for temporal reprojection.
+                
+                The last parameter is a just a scale factor
+                for the scene depth in order to get better floating point precision in the shader
+                This must be reciprocal value of the scale factor used in the mrt shader.
         */
-        DeferredShader();
-
+        SsaoShader(int w, int h, float expFactor, float scaleFactor);
         /** The algorithm renders the scene given an fbo.
                 The fbo must have color buffer, position buffer, normal buffer.
         */
-        void Render(FrameBufferObject *fbo);
+        void Render(FrameBufferObject *fbo, FrameBufferObject *fbo2);
+
+        /** Initialises the deferred shader and loads the required shaders:
+                This function has to be called only once.
+        */
+        static void Init(CGcontext context);
+
+
+protected:
+
+        void FirstPass(FrameBufferObject *fbo, FrameBufferObject *fbo2);
+
+        void SecondPass(FrameBufferObject *fbo, FrameBufferObject *fbo2);
+
+
+        ////////////
+
+        int mWidth;
+        int mHeight;
+
+        /// the temporal smoothing factor
+        float mExpFactor;
+        /// this is just a scale factor for the scene depth in order to get better float precision in the shader
+        float mScaleFactor;
 };
 
 } // namespace 
-#endif // _DeferredShader_H__
+#endif // _SsaoShader_H__