Changeset 3136 for GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/antialiasing.cg

Timestamp:

11/18/08 16:24:29 (16 years ago)

Author:

mattausch

Message:

fixed antialiasing, but ssao not working at that point (depth)

File:

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

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

@@ -3 +3 @@
 struct fragment
 {
-        float2 c:  TEXCOORD0; // center
-        float2 lt: TEXCOORD1; // left top
-        float2 rb: TEXCOORD2; // right bottom
-        float2 rt: TEXCOORD3; // right top
-        float2 lb: TEXCOORD4; // left bottom
-        float4 lr: TEXCOORD5; // left / right
-        float4 tb: TEXCOORD6; // top / bottom
+        float2 texCoords:  TEXCOORD0; 
 };
 
 // the barrier for detecting a discontinuity (x = normal, y = depth)
-uniform float4 e_barrier = float4(5e-5, 5e-5, 0, 0); 
+//const uniform float4 barrier = float4(5e-5f, 5e-5f, 0, 0); 
+const uniform float4 barrier = float4(0.6f, 9e-2f, 0, 0); 
 // the weights for normal / depth discontinuity (x = normal, y = depth)
-uniform float4 e_weights = float4(0.5f, 0.5f, 1.0f, 1.0f); 
-//uniform float4 e_weights = float4(1.0f, 1.0f, 1.0f, 1.0f);
-uniform float4 e_kernel = float4(0.5f, 1.0f, 1.0f, 1.0f); 
+const uniform float4 weights = float4(0.5f, 0.5f, 1.0f, 1.0f); 
+//uniform float4 weights = float4(1.0f, 1.0f, 1.0f, 1.0f);
+// the maximal size of the filter kernel
+const uniform float kernel = 0.5f; 
 
 
@@ -23 +19 @@
 float4 main(fragment IN, 
                         uniform sampler2D colors,
-                        uniform sampler2D normals
-                        ): COLOR
+                        uniform sampler2D normals,
+                        uniform float2 offsets[8]): COLOR
 {
-        //return tex2D(colors, IN.c.xy);
+        // center normal
+        const float3 centerNormal = normalize(tex2Dlod(normals, float4(IN.texCoords, 0, 0)).xyz);
+        // center color
+        const float4 centerColor = tex2Dlod(colors, float4(IN.texCoords, 0, 0));
+        // center depth
+        const float4 centerDepth = float4(centerColor.w);
+        
+        const float2 lt = IN.texCoords + offsets[0];
+        const float2 rb = IN.texCoords + offsets[1];
+        const float2 rt = IN.texCoords + offsets[2];
+        const float2 lb = IN.texCoords + offsets[3];
 
-        // normal discontinuity filter
-        float3 nc = (float3)tex2D(normals, IN.c.xy);
+        // compute normal discontinuities
+        float4 nd;
 
-        float4 nd;
-        nd.x = dot(nc, float3(tex2D(normals, IN.lt.xy)));
-        nd.y = dot(nc, float3(tex2D(normals, IN.rb.xy)));
-        nd.z = dot(nc, float3(tex2D(normals, IN.rt.xy)));
-        nd.w = dot(nc, float3(tex2D(normals, IN.lb.xy)));
+        nd.x = dot(centerNormal, normalize(tex2Dlod(normals, float4(lt, 0, 0)).xyz));
+        nd.y = dot(centerNormal, normalize(tex2Dlod(normals, float4(rb, 0, 0)).xyz));
+        nd.z = dot(centerNormal, normalize(tex2Dlod(normals, float4(rt, 0, 0)).xyz));
+        nd.w = dot(centerNormal, normalize(tex2Dlod(normals, float4(lb, 0, 0)).xyz));
 
-        nd -= e_barrier.x;
-        nd = step((float4)0.0f, nd);
+        nd -= float4(barrier.x);
+        nd = step(float4(0.0f), nd);
 
-        float ne = saturate(dot(nd, e_weights.x));
+        // weight the influence of normal discontinuities
+        //const float ne = saturate(dot(nd, weights.x));
+        const float ne = nd.x * nd.y *nd.z * nd.w * weights.x;
 
-        // construct opposite coordinates
-        float4 lrr = IN.lr.wzyx;
-        float4 tbr = IN.tb.wzyx;
-
-        // depth filter: compute gradient difference:
+#if 1
+        ////////////
+        // depth filter => compute gradient difference
         // (c - sample) + (c - opposite sample)
 
-        float4 dc = float4(tex2D(colors, IN.c).w);
+        float depthVals[8];
 
-        float pos_lt = (float)tex2D(colors, IN.lt.xy).w;
-        float pos_rb = (float)tex2D(colors, IN.rb.xy).w;
+        for (int i = 0; i < 8; ++ i)
+        {       
+                depthVals[i] = (float)tex2Dlod(colors, float4(IN.texCoords + offsets[i], 0, 0)).w;
+        }
 
-        float pos_lb = (float)tex2D(colors, IN.lb.xy).w;
-        float pos_rt = (float)tex2D(colors, IN.rt.xy).w;
+        float4 dd; // the gradients
 
-        float pos_l = (float)tex2D(colors, IN.lr.xy).w;
-        float pos_r = (float)tex2D(colors, lrr.xy).w;
+        for (int i = 0; i < 4; ++ i)
+        {
+                dd = float4(depthVals[i * 2] + depthVals[i * 2 + 1]);
+        }
 
-        float pos_t = (float)tex2D(colors, IN.tb.xy).w;
-        float pos_b = (float)tex2D(colors, tbr.xy).w;
+        //dd = abs(2.0f * (1.0f - abs(1.0f - centerDepth / dd))) - barrier.y;
+        dd = abs(2.0f * centerDepth - dd) - barrier.y;
+        dd = step(dd, float4(0.0f));
 
-        float4 dd;
+        const float de = saturate(dot(dd, weights.y));
 
-        dd.x = pos_lt + pos_rb;
-        dd.y = pos_lb + pos_rt;
-        dd.z = pos_l + pos_r;
-        dd.w = pos_t + pos_b;
 
-        dd = abs(2.0f * dc - dd) - e_barrier.y;
-        dd = step(dd, (float4)0.0f);
+        ///////////////////////////
 
-        float de = saturate(dot(dd, e_weights.y));
+        // weight: 0 = no antialiasing, 1 = full antialiasing
+        const float w = (1.0f - de * ne) * kernel.x;
 
-        // weight: 0 = no aa, 1 = full antialiasing
-        float w = (1.0f - de * ne) * e_kernel.x;
+        // smoothed color: the offset is big where discontinuities are
+        // (a - c) * w + c = a * w + c * (1 - w)
+        const float2 width = IN.texCoords * (1.0f - w);
 
-        // smoothed color
-        // (a - c) * w + c = a * w + c * (1 - w)
-        float2 offset = IN.c.xy * (1.0f - w);
+        float4 s0 = tex2Dlod(colors, float4(width + lt * w, 0, 0));
+        float4 s1 = tex2Dlod(colors, float4(width + rb * w, 0, 0));
+        float4 s2 = tex2Dlod(colors, float4(width + rt * w, 0, 0));
+        float4 s3 = tex2Dlod(colors, float4(width + lb * w, 0, 0));
+#endif
 
-        float4 s0 = tex2Dlod(colors, float4(offset + IN.lt.xy * w, 0, 0));
-        float4 s1 = tex2Dlod(colors, float4(offset + IN.rb.xy * w, 0, 0));
-        float4 s2 = tex2Dlod(colors, float4(offset + IN.rt.xy * w, 0, 0));
-        float4 s3 = tex2Dlod(colors, float4(offset + IN.lb.xy * w, 0, 0));
-
-        float4 centerColor = tex2Dlod(colors, float4(IN.c.xy, 0, 0));
-
-        float4 col = (s0 + s1 + s2 + s3 + centerColor) * 0.2f;
-        //return (s0 + s1 + s2 + s3) * 0.25f;
-
-        col.w = centerColor.w;
+        //float4 col = (s0 + s1 + s2 + s3 + centerColor) * 0.2f;
+        //float4 col = (s0 + s1 + s2 + s3) * 0.25f;
+        float4 col = float4(ne.x, ne.x, ne.x, 0);
+        //float4 col = float4(de.x, de.x, de.x, 0);
+        //float4 col = float4(w, w, w, 0);
+        //float4 col = centerColor;
+        // push through the current depth
+        col.w = centerDepth.x;
 
         return col;