Changeset 3296 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/combineSsao.cg

Timestamp:

02/10/09 17:43:43 (15 years ago)

Author:

mattausch

Message:

 

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/combineSsao.cg (modified) (3 diffs)

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

@@ -115 +115 @@
         float4 ao =  tex2Dlod(ssaoTex, float4(IN.texCoord, 0, 0));
 
-#if 0 // for half resolution
-
         // the following has to be done for half resolution ssao:
         // get the minimum convergence by exactly sampling the 4 surrounding
@@ -141 +139 @@
         const float convergence = minConvergence;
 
-#else
-        
-        // just take unfiltered convergence in current pixel
-        const float convergence = ao.y;
-
-#endif
         
         // filter reaches size 1 pixel when sample size reaches threshold 
@@ -188 +180 @@
         return OUT;
 }
+
+
+/** Function combining image and indirect illumination buffer using a 
+        depth and normal aware discontinuity filter. We assume that 
+        we are using half resolution ssao for this version of the combineSsao
+*/
+pixel CombineSsaoFullRes(fragment IN, 
+                                                 uniform sampler2D colorsTex,
+                                                 uniform sampler2D ssaoTex,
+                                                 uniform sampler2D normalsTex,
+                                                 uniform float2 filterOffs[NUM_SSAO_FILTER_SAMPLES],
+                                                 uniform float filterWeights[NUM_SSAO_FILTER_SAMPLES],
+                                                 uniform float ssaoFilterRadius,
+                                                 uniform float4x4 modelViewProj,
+                                                 uniform float3 bl,
+                                                 uniform float3 br,
+                                                 uniform float3 tl,
+                                                 uniform float3 tr,
+                                                 uniform float w,
+                                                 uniform float h
+                                                 )
+{
+        pixel OUT;
+
+        float4 col = tex2Dlod(colorsTex, float4(IN.texCoord, 0, 0));
+        float4 ao =  tex2Dlod(ssaoTex, float4(IN.texCoord, 0, 0));
+
+        // just take unfiltered convergence in current pixel
+        const float convergence = ao.y;
+        
+        // filter reaches size 1 pixel when sample size reaches threshold 
+        // afterwards we do not use the filter anymore
+
+        // filter up to a certain convergance value and leave out background (sky) by checking depth
+        if ((convergence < SSAO_CONVERGENCE_THRESHOLD) && (col.w < 1e10f))
+        {
+                const float distanceScale = 1.0f;
+
+                // descend to zero filter size after reaching thres pixels
+                const float convergenceWeight = SSAO_CONVERGENCE_THRESHOLD / (ssaoFilterRadius - 1.0f);
+                const float convergenceScale = convergenceWeight / (convergence + convergenceWeight);
+                const float scale = ssaoFilterRadius * convergenceScale * distanceScale;
+
+                // the filtered ssao value
+                ao.x = DiscontinuityFilter(IN.texCoord, ao, col, ssaoTex, normalsTex, colorsTex, filterOffs, scale, bl, br, tl, tr);
+        }
+
+        // just apply ssao if we are not in the sky
+        if (col.w < 1e10f)
+                OUT.illum_col.xyz = col.xyz * max(2e-2f, 1.0f - ao.x);
+                //OUT.illum_col.xyz = col.xyz * ao.x;
+        else
+                OUT.illum_col.xyz = col.xyz;
+
+        OUT.illum_col.w = col.w;
+
+        return OUT;
+}