Changeset 2861 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SsaoShader.cpp

Timestamp:

08/22/08 13:20:06 (16 years ago)

Author:

mattausch

Message:

cleaned up code

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SsaoShader.cpp (modified) (6 diffs)

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

@@ -61 +61 @@
 SsaoShader::SsaoShader(int w, int h, 
                                            Camera *cam,
-                                           float expFactor, 
                                            float scaleFactor
                                            ):
 mWidth(w), mHeight(h), 
 mCamera(cam),
-mExpFactor(expFactor), 
 mScaleFactor(scaleFactor)
-{}
+{
+        
+        ///////////
+        //-- the flip-flop fbos
+
+        mNewFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
+        // the diffuse color buffer
+        mNewFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false, false);
+        
+        mOldFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
+        // the diffuse color buffer
+        mOldFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false, false);
+        
+
+        // create noise texture for ssao
+        CreateNoiseTex2D();
+}
+
+
+SsaoShader::~SsaoShader() 
+{
+        if (sCgSsaoProgram)
+                cgDestroyProgram(sCgSsaoProgram);
+
+        DEL_PTR(mNewFbo);
+        DEL_PTR(mOldFbo);
+
+        glDeleteTextures(1, &noiseTex);
+}
 
 
 void SsaoShader::Init(CGcontext context)
-{
-        
+{       
         ///////////////
 
@@ -112 +137 @@
 
 
-void SsaoShader::Render(FrameBufferObject *fbo, FrameBufferObject *fbo2)
-{
-        FirstPass(fbo, fbo2);
-        SecondPass(fbo, fbo2);
-}
-
-
-void SsaoShader::FirstPass(FrameBufferObject *fbo, FrameBufferObject *fbo2)
-{
-        GLuint positionsTex = fbo->GetColorBuffer(0)->GetTexture();
+void SsaoShader::Render(FrameBufferObject *fbo, 
+                                                const Matrix4x4 &oldProjViewMatrix,
+                                                float expFactor)
+{
+        cgGLSetMatrixParameterfc(sOldModelViewProjMatrixParam, (const float *)oldProjViewMatrix.x);
+
+        // switch roles of old and new fbo
+        // the algorihm uses two input fbos, where the one
+        // contais the color buffer from the last frame, 
+        // the other one will be written
+        swap(mNewFbo, mOldFbo); 
+
+        FirstPass(fbo, expFactor);
+        // the second pass just renders the combined solution
+        SecondPass(fbo);
+}
+
+
+void SsaoShader::FirstPass(FrameBufferObject *fbo, float expFactor)
+{
         GLuint colorsTex = fbo->GetColorBuffer(0)->GetTexture();
-        GLuint normalsTex = fbo->GetColorBuffer(0)->GetTexture();
-
-        GLuint oldTex = fbo2->GetColorBuffer(0)->GetTexture();
+        GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture();
+        GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
+
+        // read the second buffer, write to the first buffer
+        mNewFbo->Bind();
+        GLuint oldTex = mOldFbo->GetColorBuffer(0)->GetTexture();
 
         glPushAttrib(GL_VIEWPORT_BIT);
@@ -172 +210 @@
         
         cgGLSetParameter1f(sMaxDepthParam, mScaleFactor);
-        cgGLSetParameter1f(sExpFactorParam, mExpFactor);
+        cgGLSetParameter1f(sExpFactorParam, expFactor);
 
 
@@ -215 +253 @@
         glPopAttrib();
 
-        PrintGLerror("displaytexture");
-
-        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
-
+        FrameBufferObject::Release();
 
         PrintGLerror("ssao first pass");
@@ -224 +259 @@
 
 
-void SsaoShader::SecondPass(FrameBufferObject *fbo, FrameBufferObject *fbo2)
+void SsaoShader::SecondPass(FrameBufferObject *fbo)
 {
         glEnable(GL_TEXTURE_2D);
 
-        glBindTexture(GL_TEXTURE_2D, fbo2->GetColorBuffer(0)->GetTexture());
+        glBindTexture(GL_TEXTURE_2D, mNewFbo->GetColorBuffer(0)->GetTexture());
 
         glDisable(GL_LIGHTING);
@@ -274 +309 @@
         mCamera->ComputePoints(ftl, ftr, fbl, fbr, ntl, ntr, nbl, nbr);
 
-#if 1 // matT: debug this!!
+#if 0 // matT: debug this!!
         
         bl = Normalize(nbl - fbl);