Changeset 2869 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg

Timestamp:

08/26/08 18:09:03 (16 years ago)

Author:

mattausch

Message:

computing ao in nice function ... but slow!!

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg (modified) (4 diffs)

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

@@ -181 +181 @@
         return float4(total_color, 1.0f - total_ao);
 }
+
+
+float ComputeSmoothedColor(float4 centerPosition, 
+                                                   uniform sampler2D oldTex,
+                                                   uniform float maxDepth,  
+                                                   uniform float expFactor,
+                                                   const uniform float4x4 oldModelViewProj,
+                                                   float4 currentCol
+                                                   )
+{
+        float4 realPos = centerPosition * maxDepth;
+        realPos.w = 1.0f;
+
+        float4 oldPos = mul(oldModelViewProj, realPos);
+
+        float newDepth = oldPos.z / oldPos.w;
+
+        float2 tex = (oldPos.xy / oldPos.w) * 0.5f + 0.5f;
+        float4 oldCol = tex2D(oldTex, tex);
+
+        float oldDepth = oldCol.w;
+        float depthDif = 1.0f - newDepth / oldDepth;
+
+        float4 col;
+
+        if ((tex.x >= 0.0f) && (tex.x < 1.0f) && 
+                (tex.y >= 0.0f) && (tex.y < 1.0f) && 
+                (abs(depthDif)  < 1e-4f))
+        {
+                col = currentCol * expFactor + oldCol * float4(1.0f - expFactor);
+        }
+        else
+        {
+                col = currentCol;
+        }
+
+        return col;
+ }
 
 
@@ -217 +255 @@
 
         float ao = ssao(IN, positions, noiseTexture, samples, normal.xyz, viewDir, noiseMultiplier, centerPosition);
-        float4 attenuated_color = ao * col;
+        //float4 attenuated_color = ao * col;
         //float4 attenuated_color = ao;
 
@@ -223 +261 @@
         //float4 attenuated_color = ao * col + new_col;
         
-        const float x = expFactor;
-
-        float4 dummy = centerPosition * maxDepth;
-        dummy.w = 1.0f;
-
-        float4 oldPos = mul(oldModelViewProj, dummy);
-
-        float newDepth = oldPos.z / oldPos.w;
- 
-        float2 tex = (oldPos.xy / oldPos.w) * 0.5f + 0.5f;
-        float4 col1 = tex2D(oldTex, tex);
-
-        float oldDepth = col1.w;
-        float depthDif = 1.0f - newDepth / oldDepth;
-
-        if ((tex.x >= 0.0f) && (tex.x < 1.0f) && 
-                (tex.y >= 0.0f) && (tex.y < 1.0f) && 
-                (abs(depthDif)  < 1e-4f))
-        {
-                OUT.color = attenuated_color * expFactor + col1 * float4(1.0f - expFactor);
-        }
-        else
-        {
-                OUT.color = attenuated_color;
-        }
+        // compute temporally smoothed color
+        OUT.color = ComputeSmoothedColor(centerPosition, oldTex, maxDepth, expFactor, oldModelViewProj, float4(ao));
 
         //OUT.color.xyz = viewDir;
@@ -256 +271 @@
         return OUT;
 }
+
+
+pixel combined(fragment IN, 
+                           uniform sampler2D colors,
+                           uniform sampler2D ssaoTex
+                   )
+{
+        pixel OUT;
+
+        float4 col = tex2D(colors, IN.texCoord.xy);
+        float4 ao = tex2D(ssaoTex, IN.texCoord.xy);
+
+        OUT.color = float4(1,0,0,0);
+        OUT.color = col * ao;
+
+        return OUT;
+}