Changeset 2871 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg

Timestamp:

08/26/08 20:45:40 (16 years ago)

Author:

mattausch

Message:

working with 50 frames

File:

• GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/ssao.cg (modified) (11 diffs)

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

@@ -27 +27 @@
 struct pixel
 {
-        float4 color: COLOR0;
+        float4 illum_col: COLOR0;
+        float4 combined_col: COLOR1;
 };
 
@@ -33 +34 @@
 float2 reflect(float2 pt, float2 n)
 {
-  // distance to plane
-  float d = dot(n, pt);
-  // reflect around plane
-  float2 rpt = pt - d * 2.0f * n;
-
-  return rpt;
-}
-
-
-float2 rotate(float2 pt, float2 n)
+        // distance to plane
+        float d = dot(n, pt);
+        // reflect around plane
+        float2 rpt = pt - d * 2.0f * n;
+        return rpt;
+}
+
+
+/*float2 rotate(float2 pt, float2 n)
 {
         float2 ptTransformed;
@@ -49 +49 @@
 
         return ptTransformed;
-}
+}*/
 
 
@@ -121 +121 @@
 /** Computes ambient occlusion + diffuse reflections
 */
+/*
 float4 globIllum(fragment IN,
                                  uniform sampler2D colors,
@@ -149 +150 @@
 
                 //sample noisetex; r stores costheta, g stores sintheta
-                float2 mynoise = tex2D(noiseTexture, IN.texCoord.xy * noiseMultiplier).xy * 2.0f - 1.0f;
+                float2 mynoise = tex2D(noiseTexture, IN.texCoord.xy * noiseMultiplier).xy;
 
                 // rotation
@@ -157 +158 @@
                 float2 texcoord = IN.texCoord.xy + offsetTransformed * AREA_SIZE * w;
 
-                float3 sample_position = tex2D(positions, texcoord).xyz;
-                float3 sample_color = tex2D(colors, texcoord).xyz;
+                float3 sample_position = tex2Dlod(positions, float4(texcoord, 0, 1)).xyz;
+                float3 sample_color = tex2D(colors, float4(texcoord, 0, 1)).xyz;
 
                 float3 vector_to_sample = sample_position - centerPosition.xyz;
@@ -176 +177 @@
 
                 total_ao += cos_angle * distance_intensity * view_correction;
-                total_color += cos_angle * distance_intensity * view_correction * sample_color * 0.3f;
+                float scale_factor = 0.3f;
+                total_color += cos_angle * distance_intensity * view_correction * sample_color * scale_factor;
         }
 
         return float4(total_color, 1.0f - total_ao);
 }
-
+*/
 
 /** The mrt shader for screen space ambient occlusion
@@ -200 +202 @@
         pixel OUT;
 
-        float4 normal = tex2D(normals, IN.texCoord.xy);
+        float4 norm = tex2D(normals, IN.texCoord.xy);
         
         // the ambient term
-        float amb = normal.w;
+        const float amb = norm.w;
 
         // expand normal
-        normal = normalize(normal);// * 2.0f - 1.0f);
+        float3 normal = normalize(norm.xyz);// * 2.0f - 1.0f);
         /// the current view direction
         float3 viewDir = normalize(IN.view * 2.0f - float3(1.0f));
 
         // the current world position
-        float4 centerPosition = tex2D(positions, IN.texCoord.xy);
+        const float4 centerPosition = tex2D(positions, IN.texCoord.xy);
         
         // the current color
-        float4 currentCol = tex2D(colors, IN.texCoord.xy);
-        float currentDepth = currentCol.w;
-
-        float ao = ssao(IN, positions, noiseTexture, samples, normal.xyz, viewDir, noiseMultiplier, centerPosition);
-
-        //float4 new_col = globIllum(IN, colors, positions, noiseTexture, samples, normal.xyz, viewDir, noiseMultiplier, centerPosition); 
+        const float4 currentCol = tex2D(colors, IN.texCoord.xy);
+        const float currentDepth = currentCol.w;
+
+        float4 new_col = (float4)ssao(IN, positions, noiseTexture, samples, normal, viewDir, noiseMultiplier, centerPosition);
+        //float4 new_col = globIllum(IN, colors, positions, noiseTexture, samples, normal, viewDir, noiseMultiplier, centerPosition); 
         
-        // compute temporally smoothed color
+
+        /////////////////
+        //-- compute temporally smoothed value
+
         float4 realPos = centerPosition * maxDepth;
         realPos.w = 1.0f;
@@ -227 +231 @@
         float4 oldPos = mul(oldModelViewProj, realPos);
 
-        float newDepth = oldPos.z / oldPos.w;
+        const 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;
+        const float oldDepth = oldCol.w;
+        const float depthDif = 1.0f - newDepth / oldDepth;
 
         if ((tex.x >= 0.0f) && (tex.x < 1.0f) && 
@@ -239 +243 @@
                 (abs(depthDif)  < 1e-4f))
         {
-                OUT.color = float4(ao * expFactor + oldCol * float4(1.0f - expFactor));
+                OUT.illum_col = new_col * expFactor + oldCol * float4(1.0f - expFactor);
         }
         else
         {
-                OUT.color = (float4)ao;
-        }
-
-
-        //OUT.color.xyz = viewDir;
-        //OUT.color = attenuated_color;
-        
-        OUT.color.w = currentDepth;
+                OUT.illum_col = new_col;
+        }
+
+
+        OUT.combined_col = currentCol * OUT.illum_col;
+
+        OUT.illum_col.w = currentDepth;
 
         return OUT;
 }
 
-
+/*
 pixel combined(fragment IN, 
                            uniform sampler2D colors,
@@ -265 +268 @@
         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;
+        //float4 illum = tex2D(ssaoTex, IN.texCoord.xy);
+
+        OUT.illum_col = col * ao;
 
         return OUT;
-}
+}*/