init

gamedata/shaders/d3d11/fluid_edge_detect.ps.hlsl

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+#include "fluid_common_render.hlsli"
+
+//	Pixel
+// A full-screen edge detection pass to locate artifacts
+//	these artifacts are located on a downsized version of the rayDataTexture
+// We use a smaller texture both to accurately find all the depth artifacts
+//  when raycasting to this smaller size and to save on the cost of this pass
+// Use col.a to find depth edges of objects occluding the smoke
+// Use col.g to find the edges where the camera near plane cuts the smoke volume
+//
+float4 main(VS_OUTPUT_EDGE vIn) : SV_Target
+{
+    // We need eight samples (the centre has zero weight in both kernels).
+    float4 col;
+    col = rayDataTexSmall.Sample(samPointClamp, vIn.textureUV00);
+    float g00 = col.a;
+    if (col.g < 0)
+    {
+        g00 *= -1;
+    }
+    col = rayDataTexSmall.Sample(samPointClamp, vIn.textureUV01);
+    float g01 = col.a;
+    if (col.g < 0)
+    {
+        g01 *= -1;
+    }
+    col = rayDataTexSmall.Sample(samPointClamp, vIn.textureUV02);
+    float g02 = col.a;
+    if (col.g < 0)
+    {
+        g02 *= -1;
+    }
+    col = rayDataTexSmall.Sample(samPointClamp, vIn.textureUV10);
+    float g10 = col.a;
+    if (col.g < 0)
+    {
+        g10 *= -1;
+    }
+    col = rayDataTexSmall.Sample(samPointClamp, vIn.textureUV12);
+    float g12 = col.a;
+    if (col.g < 0)
+    {
+        g12 *= -1;
+    }
+    col = rayDataTexSmall.Sample(samPointClamp, vIn.textureUV20);
+    float g20 = col.a;
+    if (col.g < 0)
+    {
+        g20 *= -1;
+    }
+    col = rayDataTexSmall.Sample(samPointClamp, vIn.textureUV21);
+    float g21 = col.a;
+    if (col.g < 0)
+    {
+        g21 *= -1;
+    }
+    col = rayDataTexSmall.Sample(samPointClamp, vIn.textureUV22);
+    float g22 = col.a;
+    if (col.g < 0)
+    {
+        g22 *= -1;
+    }
+
+    // Sobel in horizontal dir.
+    float sx = 0;
+    sx -= g00;
+    sx -= g01 * 2;
+    sx -= g02;
+    sx += g20;
+    sx += g21 * 2;
+    sx += g22;
+    // Sobel in vertical dir - weights are just rotated 90 degrees.
+    float sy = 0;
+    sy -= g00;
+    sy += g02;
+    sy -= g10 * 2;
+    sy += g12 * 2;
+    sy -= g20;
+    sy += g22;
+
+    float e = EdgeDetectScalar(sx, sy, edgeThreshold);
+    return float4(e, e, e, 1);
+}