Changeset 2895 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/deferred.cg

Timestamp:

09/02/08 15:29:20 (16 years ago)

Author:

mattausch

Message:

 

File:

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

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

@@ -81 +81 @@
                                   uniform sampler2D shadowMap,
                                   uniform float4x4 shadowMatrix,
-                                  uniform float maxDepth
+                                  uniform float maxDepth,
+                                  uniform float sampleWidth
                                   )
 {
@@ -102 +103 @@
         float4 lightSpacePos = mul(shadowMatrix, position);
 
-        float shadowDepth = tex2D(shadowMap, lightSpacePos.xy);
+        float shadowDepth[9];
+
+        float w = sampleWidth;
+
+        // pcf sampling using 3 x 3 tab
+
+        shadowDepth[0] = tex2D(shadowMap, lightSpacePos.xy).x;
+        
+        shadowDepth[1] = tex2D(shadowMap, lightSpacePos.xy + float2( w,  w)).x;
+        shadowDepth[2] = tex2D(shadowMap, lightSpacePos.xy - float2( w, -w)).x;
+        shadowDepth[3] = tex2D(shadowMap, lightSpacePos.xy - float2(-w, -w)).x;
+        shadowDepth[4] = tex2D(shadowMap, lightSpacePos.xy - float2(-w,  w)).x;
+
+        shadowDepth[5] = tex2D(shadowMap, lightSpacePos.xy - float2( w,  0)).x;
+        shadowDepth[6] = tex2D(shadowMap, lightSpacePos.xy - float2( 0,  w)).x;
+        shadowDepth[7] = tex2D(shadowMap, lightSpacePos.xy - float2(-w,  0)).x;
+        shadowDepth[8] = tex2D(shadowMap, lightSpacePos.xy - float2( 0, -w)).x;
 
         OUT.color = col;
         
-        // hack: prevent shadowing the sky
-        if ((amb < 0.9) &&      
+        float depth = lightSpacePos.z / lightSpacePos.w;
+
+        float d = 0.0f;
+
+        for (int i = 0; i < 9; ++ i)
+        {
+                d += step(shadowDepth[i], depth);
+        }
+
+        d /= 9.0f;
+        
+        /*if ((amb < 0.9) && // hack: prevent shadowing the sky 
                 (lightSpacePos.z / lightSpacePos.w > shadowDepth))
         {
                 OUT.color *= 0.1f;
+        }*/
+        
+        if (amb < 0.9) // hack: prevent shadowing the sky       
+        {
+                const float x = 0.1f;
+                OUT.color *= x + (1.0f - x) * (1.0f - d);
         }