Changeset 3318 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg

Timestamp:

02/18/09 08:01:56 (15 years ago)

Author:

mattausch

Message:

played around with reprojection, cleaned up code

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg (modified) (2 diffs)

GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg

@@ -43 +43 @@
 
 
+float ComputeConvergence(uniform sampler2D tex, float2 texCoord, float2 res)
+{
+        // get the minimum convergence by exactly sampling the 4 surrounding
+        // texels in the old texture, otherwise flickering because convergence
+        // will be interpolated when upsampling and filter size does not match!
+
+        float4 texelCenterConv;
+        const float2 offs(1.0f / res.x, 1.0f / res.y);
+
+        // get position exactly between texel centers
+        float2 center = (floor(texCoord * res) + float2(.5f)) * offs;
+        //center.x = (floor(texCoord.x * res.x - .5f) + 1.0f) / res.x;
+        //center.y = (floor(texCoord.y * res.y - .5f) + 1.0f) / res.y;
+        //center.y = (floor(texCoord.y * res.y) + .5f) * yOffs;
+
+        /*texelCenterConv.x = tex2Dlod(tex, float4(center + float2( xoffs,  yoffs), 0, 0)).y;
+        texelCenterConv.y = tex2Dlod(tex, float4(center + float2( xoffs, -yoffs), 0, 0)).y;
+        texelCenterConv.z = tex2Dlod(tex, float4(center + float2(-xoffs, -yoffs), 0, 0)).y;
+        texelCenterConv.w = tex2Dlod(tex, float4(center + float2(-xoffs,  yoffs), 0, 0)).y;
+
+        const float m1 = min(texelCenterConv.x, texelCenterConv.y);
+        const float m2 = min(texelCenterConv.z, texelCenterConv.w);
+
+        const float convergence = min(m1, m2);*/
+
+        const float convergence = tex2Dlod(tex, float4(center, 0, 0)).y;
+
+        return convergence;
+}
 
 /** This shader computes the reprojection and stores 
@@ -107 +136 @@
         {
                 // pixel valid => retrieve the convergence weight
-                float w1 = tex2Dlod(oldTex, float4(oldTexCoords + float2(0.5f / 1024.0f, 0), .0f, .0f)).y;
+                /*float w1 = tex2Dlod(oldTex, float4(oldTexCoords + float2(0.5f / 1024.0f, 0), .0f, .0f)).y;
                 float w2 = tex2Dlod(oldTex, float4(oldTexCoords - float2(0.5f / 1024.0f, 0), .0f, .0f)).y;
                 float w3 = tex2Dlod(oldTex, float4(oldTexCoords + float2(0, 0.5f / 768.0f), .0f, .0f)).y;
                 float w4 = tex2Dlod(oldTex, float4(oldTexCoords - float2(0, 0.5f / 768.0f), .0f, .0f)).y;
 
-                w = min(min(w1, w2), min(w3, w4));
+                w = min(min(w1, w2), min(w3, w4));*/
+                
+                w = ComputeConvergence(oldTex, oldTexCoords, float2(1024.0f, 768.0f));
                 //w = oldPixel.y;
         }