Changeset 2860 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SsaoShader.cpp

Timestamp:

08/21/08 20:17:46 (16 years ago)

Author:

mattausch

Message:

 

File:

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

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

@@ -3 +3 @@
 #include "RenderState.h"
 #include "SampleGenerator.h"
+#include "Vector3.h"
+#include "Camera.h"
 
 
 using namespace std;
 
-GLenum mrt[] = {GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_COLOR_ATTACHMENT2_EXT};
+static GLenum mymrt[] = {GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_COLOR_ATTACHMENT2_EXT};
 
 namespace CHCDemoEngine
 {
+
+// number of ssao samples
+#define NUM_SAMPLES 16
+
 
 static CGprogram sCgSsaoProgram = NULL;
@@ -25 +31 @@
 static CGparameter sExpFactorParam;
 
-
-#define NUM_SAMPLES 16
+static GLuint noiseTex;
 
 // ssao random spherical samples
@@ -54 +59 @@
 
 
-SsaoShader::SsaoShader(int w, int h, float expFactor, float scaleFactor):
-mWidth(w), mHeight(h), mExpFactor(expFactor), mScaleFactor(scaleFactor)
+SsaoShader::SsaoShader(int w, int h, 
+                                           Camera *cam,
+                                           float expFactor, 
+                                           float scaleFactor
+                                           ):
+mWidth(w), mHeight(h), 
+mCamera(cam),
+mExpFactor(expFactor), 
+mScaleFactor(scaleFactor)
 {}
 
@@ -113 +125 @@
         GLuint normalsTex = fbo->GetColorBuffer(0)->GetTexture();
 
+        GLuint oldTex = fbo2->GetColorBuffer(0)->GetTexture();
+
         glPushAttrib(GL_VIEWPORT_BIT);
         glViewport(0, 0, mWidth, mHeight);
 
-        glDrawBuffers(1, mrt);
+        glDrawBuffers(1, mymrt);
 
         glDisable(GL_ALPHA_TEST);
@@ -172 +186 @@
 
         // note: slightly larger texture hides ambient occlusion error on border but costs resolution
-        //float offs2 = 0.55f;
-        float offs2 = 0.5f;
-
-        glColor3f(bl.x, bl.y, bl.z); glTexCoord2f(0, 0); glVertex3f(-offs2, -offs2, -0.5f);
-        glColor3f(br.x, br.y, br.z); glTexCoord2f(1, 0); glVertex3f( offs2, -offs2, -0.5f);
-        glColor3f(tr.x, tr.y, tr.z); glTexCoord2f(1, 1); glVertex3f( offs2,  offs2, -0.5f);
-        glColor3f(tl.x, tl.y, tl.z); glTexCoord2f(0, 1); glVertex3f(-offs2,  offs2, -0.5f);
+        //const float new_offs = 0.55f;
+        const float new_offs = 0.5f;
+        
+        glColor3f(bl.x, bl.y, bl.z); glTexCoord2f(0, 0); glVertex3f(-new_offs, -new_offs, -0.5f);
+        glColor3f(br.x, br.y, br.z); glTexCoord2f(1, 0); glVertex3f( new_offs, -new_offs, -0.5f);
+        glColor3f(tr.x, tr.y, tr.z); glTexCoord2f(1, 1); glVertex3f( new_offs,  new_offs, -0.5f);
+        glColor3f(tl.x, tl.y, tl.z); glTexCoord2f(0, 1); glVertex3f(-new_offs,  new_offs, -0.5f);
 
         glEnd();
 
-        cgGLDisableTextureParameter(sColorsTexParamSsao);
-        cgGLDisableTextureParameter(sPositionsTexParamSsao);
-        cgGLDisableTextureParameter(sNormalsTexParamSsao);
-        cgGLDisableTextureParameter(sNoiseTexParamSsao);
-        cgGLDisableTextureParameter(sOldTexParamSsao);
+        cgGLDisableTextureParameter(sColorsTexParam);
+        cgGLDisableTextureParameter(sPositionsTexParam);
+        cgGLDisableTextureParameter(sNormalsTexParam);
+        cgGLDisableTextureParameter(sNoiseTexParam);
+        cgGLDisableTextureParameter(sOldTexParam);
 
         cgGLDisableProfile(RenderState::sCgFragmentProfile);
@@ -254 +268 @@
 
 
+void SsaoShader::ComputeViewVectors(Vector3 &tl, Vector3 &tr, Vector3 &bl, Vector3 &br)
+{
+        Vector3 ftl, ftr, fbl, fbr, ntl, ntr, nbl, nbr;
+
+        mCamera->ComputePoints(ftl, ftr, fbl, fbr, ntl, ntr, nbl, nbr);
+
+#if 1 // matT: debug this!!
+        
+        bl = Normalize(nbl - fbl);
+        br = Normalize(nbr - fbr);
+        tl = Normalize(ftl - ntl);
+        tr = Normalize(ftr - ntr);
+
+#else // just take camera direction
+        
+        bl = -Normalize(mCamera->GetDirection());
+        br = -Normalize(mCamera->GetDirection());
+        tl = -Normalize(mCamera->GetDirection());
+        tr = -Normalize(mCamera->GetDirection());
+
+#endif
+
+        // normalize to 0 .. 1
+        bl = bl * 0.5f + 0.5f;
+        br = br * 0.5f + 0.5f;
+        tl = tl * 0.5f + 0.5f;
+        tr = tr * 0.5f + 0.5f;
+}
+
+
+void SsaoShader::CreateNoiseTex2D()
+{
+        GLubyte *randomNormals = new GLubyte[mWidth * mHeight * 3];
+
+        for (int i = 0; i < mWidth * mHeight * 3; i += 3)
+        {
+                // create random samples over sphere
+                const float rx = RandomValue(0, 1);
+                const float theta = 2.0f * acos(sqrt(1.0f - rx));
+
+                randomNormals[i + 0] = (GLubyte)((cos(theta) * 0.5f + 0.5f) * 255.0f);
+                randomNormals[i + 1] = (GLubyte)((sin(theta) * 0.5f + 0.5f) * 255.0f);
+                randomNormals[i + 2] = 0;
+        }
+
+        glEnable(GL_TEXTURE_2D);
+        glGenTextures(1, &noiseTex);
+        glBindTexture(GL_TEXTURE_2D, noiseTex);
+                
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, mWidth, mHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, randomNormals);
+
+        glBindTexture(GL_TEXTURE_2D, 0);
+        glDisable(GL_TEXTURE_2D);
+
+        delete [] randomNormals;
+
+        cout << "created noise texture" << endl;
+
+        PrintGLerror("noisetexture");
+}
+
 
 } // namespace