Changeset 3313 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg

Timestamp:

02/16/09 17:08:51 (15 years ago)

Author:

mattausch

Message:

reverted back to before poisson sampling scheme

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg (modified) (16 diffs)

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

@@ -48 +48 @@
         weight of the pixel in the new frame.
 */
-inline float3 temporalSmoothing(float4 worldPos,
+inline float2 temporalSmoothing(float4 worldPos,
                                                                 float eyeSpaceDepth,
                                                                 float2 texcoord0,
@@ -96 +96 @@
         // the weight of the accumulated samples from the previous frames
         float w;
-        float idx;
 
         //////////////
@@ -109 +108 @@
                 // pixel valid => retrieve the convergence weight
                 w = oldPixel.y;
-                idx = oldPixel.z;
         }
         else
         {       
-                w = .0f;
-                idx = .0f;
-        }
-
-        return float3(ssao, w, idx);
+                w = 0.0f;
+        }
+
+        return float2(ssao, w);
 }
 
@@ -145 +142 @@
         float validSamples = .0f;
 
-
-        for (int i = 0; i < NUM_PRECOMPUTED_SAMPLES; ++ i) 
+        for (int i = 0; i < NUM_SAMPLES; ++ i) 
         {
                 const float2 offset = samples[i];
@@ -224 +220 @@
                         sampler2D colors,
                         sampler2D noiseTex,
-                        sampler2D samples,
+                        float2 samples[NUM_SAMPLES],
                         float3 normal,
                         float3 centerPosition,
@@ -235 +231 @@
                         float convergence,
                         float sampleIntensity,
-                        bool isMovingObject,
-                        float idx
+                        bool isMovingObject
                         )
 {
@@ -242 +237 @@
         float validSamples = .0f;
         float numSamples = .0f;
-        
+
         for (int i = 0; i < NUM_SAMPLES; ++ i) 
         {
@@ -251 +246 @@
                 //-- (affects performance for some reason!)
 
-                const float2 ssaoOffset = tex2Dlod(samples, float4((0.5f + i + idx) / NUM_PRECOMPUTED_SAMPLES, 0.5f, .0f, .0f)).xy;
-
                 if (convergence < SSAO_CONVERGENCE_THRESHOLD)
                 {
-                        float2 mynoise = tex2Dlod(noiseTex, float4(IN.texCoord.x * 4.0f + idx * 0.01f, IN.texCoord.y * 4.0f, 0, 0)).xy;
+                        float2 mynoise = tex2Dlod(noiseTex, float4(IN.texCoord * 4.0f, 0, 0)).xy;
                         //offset = myreflect(samples[i], mynoise);
-                        //offset = myrotate(samples[i], mynoise.x);
-
-                        offset = myrotate(ssaoOffset, mynoise.x);
+                        offset = myrotate(samples[i], mynoise.x);
                 }
                 else
                 {
-                        offset = ssaoOffset;
-                        //offset = samples[i];
+                        offset = samples[i];
                 }
                 
@@ -304 +294 @@
                 // we check if the sample could have been near enough to the current pixel 
                 // to have any influence in the current or last frame
-                //const float tooFarAway = step(0.5f, lengthToSample - changeFactor);
+                const float tooFarAway = step(0.5f, lengthToSample - changeFactor);
                 //validSamples = max(validSamples, (1.0f - tooFarAway) * pixelValid * step(-0.1f, cosAngle));
                 validSamples = max(validSamples, pixelValid);
@@ -313 +303 @@
                 if (numSamples >= MIN_SAMPLES)
                 {
+                        //break;
                         // if the pixel belongs to a static object and all the samples stay valid in the current frame
                         if (!isMovingObject && (validSamples < 1.0f)) break;
-                        // if the pixel belongs to a dynamic object but the #accumulated samples
-                        // for this pixel is sufficiently high (=> there was no discontinuity recently)
+                        // if the pixel belongs to a dynamic object but the #accumulated samples for this pixel is sufficiently high 
+                        // (=> there was no discontinuity recently)
                         else if (isMovingObject && (convergence > NUM_SAMPLES * 5)) break;
                 }
@@ -344 +335 @@
                    uniform sampler2D normals,
                    uniform sampler2D noiseTex,
-                   uniform sampler2D samples,
+                   uniform float2 samples[NUM_SAMPLES],
                    uniform sampler2D oldTex,
                    uniform float4x4 modelViewProj,
@@ -391 +382 @@
         //-- compute temporal reprojection
 
-        float3 temporalVals = temporalSmoothing(eyeSpacePos, eyeSpaceDepth, IN.texCoord, oldEyePos,
+        float2 temporalVals = temporalSmoothing(eyeSpacePos, eyeSpaceDepth, IN.texCoord, oldEyePos,
                                                 oldTex, oldModelViewProj, 
                                                                                         colors, 
@@ -402 +393 @@
         const float oldSsao = temporalVals.x;
         float oldWeight = temporalVals.y;
-
-        float idx = (int)temporalVals.z;
-
-        if (idx >= NUM_PRECOMPUTED_SAMPLES) idx = 0;
-
+        
         float3 ao;
 
@@ -412 +399 @@
         if (eyeSpaceDepth < DEPTH_THRESHOLD)
         {
-                ao = ssao(IN, colors, noiseTex, samples, normal, eyeSpacePos.xyz, 
-                              scaleFactor, bl, br, tl, tr, normalize(viewDir), oldWeight, 
-                                  sampleIntensity, isMovingObject, idx);
+                ao = ssao(IN, colors, noiseTex, samples, normal, eyeSpacePos.xyz, scaleFactor, bl, br, tl, tr, normalize(viewDir), oldWeight, sampleIntensity, isMovingObject);
                 //ao = ssao2(IN, colors, noiseTex, samples, normal, eyeSpacePos.xyz, scaleFactor, bl, br, tl, tr, normalize(viewDir), normals, sampleIntensity);
         }
@@ -429 +414 @@
         // the weight equals the number of sampled shot in this pass
         const float newWeight = ao.z;
-
-        idx += newWeight;
 
         // completely reset the ao in this pixel
@@ -437 +420 @@
         const float partlyResetThres = 1.0f;
         
-        // hack: just update static geometry
-        if (!isMovingObject)
+        if (1)//!isMovingObject)
         {
                 if (ao.y > completelyResetThres) 
                 {
-                        oldWeight = .0f;
-                        idx = .0f;
+                        oldWeight = .0f; 
                 }
                 else if (ao.y > partlyResetThres)
                 {
                         oldWeight = min(oldWeight, 4.0f * newWeight);
+                        //oldWeight = .0f; 
                 }
         }
-
 
         //////////
         //-- blend ao between old and new samples (and avoid division by zero)
 
-        OUT.illum_col.x = ao.x * newWeight + oldSsao * oldWeight;
+        OUT.illum_col.x = (ao.x * newWeight + oldSsao * oldWeight);// / (newWeight + oldWeight);//max(1e-6f, newWeight + oldWeight);
+
         OUT.illum_col.x /= (newWeight + oldWeight);
 
         // the new weight for the next frame
         const float combinedWeight = clamp(newWeight + oldWeight, .0f, temporalCoherence);
-        
+
         OUT.illum_col.y = combinedWeight;
         // can be used to check if this pixel belongs to a moving object
-        //OUT.illum_col.z = SqrLen(diffVec);
-        OUT.illum_col.z = idx;
+        OUT.illum_col.z = SqrLen(diffVec);
         OUT.illum_col.w = eyeSpaceDepth;