Changeset 2904 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg

Timestamp:

09/04/08 16:46:27 (16 years ago)

Author:

mattausch

Message:

got rid of error with newly visible surfaces, much faster

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg (modified) (7 diffs)

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

@@ -35 +35 @@
 /** The ssao shader returning the an intensity value between 0 and 1
 */
-float ssao(fragment IN,
+float2 ssao(fragment IN,
                    uniform sampler2D positions,
                    uniform sampler2D noiseTexture,
                    uniform float2 samples[NUM_SAMPLES],
                    uniform float3 currentNormal,
-                   uniform float3 currentViewDir,
                    uniform float4 centerPosition
+                   //,uniform float3 currentViewDir
                    )
 {
@@ -52 +52 @@
 
         float total_ao = 0.0;
+        float numSamples = 0;
 
         for (int i = 0; i < NUM_SAMPLES; ++ i) 
@@ -68 +69 @@
                 float2 texcoord = IN.texCoord.xy + offsetTransformed * AREA_SIZE * w;
 
-                //if ((texcoord.x <= 1.0f) || (texcoord.x >= 0.0f) || (texcoord.y <= 1.0f) || (texcoord.y >= 0.0f))
-                
+                if ((texcoord.x <= 1.0f) && (texcoord.x >= 0.0f) && (texcoord.y <= 1.0f) && (texcoord.y >= 0.0f))
+                        ++ numSamples;
+
                 // sample downsampled texture in order to speed up texture accesses
                 float3 sample_position = tex2Dlod(positions, float4(texcoord, 0, 1)).xyz;
@@ -92 +94 @@
 
                 total_ao += cos_angle * distance_intensity;
+
+                //total_ao /= j;
         }
 
-        return max(0.0f, 1.0f - total_ao);
+        return float2(max(0.0f, 1.0f - total_ao), numSamples);
         //return saturate(dot(currentViewDir, currentNormal));
 }
@@ -124 +128 @@
         
         /// the current view direction
-        float3 viewDir;// = normalize(IN.view);
+        //float3 viewDir = normalize(IN.view);
 
         // the current world position
@@ -133 +137 @@
         const float currentDepth = currentCol.w;
 
-        const float ao = ssao(IN, positions, noiseTexture, samples, normal, viewDir, centerPosition);
+        const float2 ao = ssao(IN, positions, noiseTexture, samples, normal, centerPosition);//, viewDir);
                 
 
@@ -154 +158 @@
 
         float oldWeight = clamp(oldCol.z, 0, temporalCoherence);
+        float oldNumSamples = oldCol.y;
+
         float newWeight;
 
-        if ((temporalCoherence > 0) &&
+        if (//(temporalCoherence > 0) &&
                 (tex.x >= 0.0f) && (tex.x < 1.0f) && 
                 (tex.y >= 0.0f) && (tex.y < 1.0f) && 
-                (abs(depthDif) < 1e-4f))
+                (abs(depthDif) < 1e-3f) 
+                && (oldNumSamples > ao.y - 1.5f) // check if something happened in the surrounding area
+                )
         {
-                newWeight = oldWeight + 1;
+                // increase the weight for convergence
+                newWeight = oldWeight + 1.0f;
 
                 //OUT.illum_col = (float4)ao * expFactor + oldCol.x * (1.0f - expFactor);
-                OUT.illum_col = (float4)(ao + oldCol.x * oldWeight) / newWeight;
+                OUT.illum_col.xy = (ao.xy + oldCol.xy * oldWeight) / newWeight;
+
+                //if (!(oldNumSamples > ao.y - 1.5f)) newWeight = 0;
         }
         else
         {
-                OUT.illum_col = (float4)ao;
+                OUT.illum_col.xy = ao.xy;
                 newWeight = 0;
         }
 
 
+        //OUT.illum_col.y = ao.y;
         OUT.illum_col.z = newWeight;
         OUT.illum_col.w = currentDepth;