init

gamedata/shaders/d3d11/fluid_advect_bfecc.ps.hlsl

@@ -0,0 +1,32 @@
+#include "fluid_common.hlsli"
+
+//////////////////////////////////////////////////////////////////////////////////////////
+//	Pixel
+float4 main(p_fluidsim input) : SV_Target
+{
+    if (IsNonEmptyCell(input.texcoords.xyz))
+    {
+        return 0;
+    }
+
+    float3 npos = GetAdvectedPosTexCoords(input);
+
+    float4 r;
+    float3 diff = abs(floatVolumeDim.xyz - input.cell0.xyz);
+
+    // Must use regular semi-Lagrangian advection instead of BFECC at the volume boundaries
+    if ((diff.x > (floatVolumeDim.x - 4)) || (diff.y > (floatVolumeDim.y - 4)) || (diff.z > (floatVolumeDim.z - 4)))
+    {
+        r = Texture_color.SampleLevel(samLinear, npos, 0);
+    }
+    else
+    {
+        // Texture_color contains \phi^n; Texture_tempscalar contains \bar{\phi}
+        //  (i.e.: the result of 1 forward advection step, followed by a backwards advection step)
+        r = 1.5f * Texture_color.SampleLevel(samLinear, npos, 0) -
+            0.5f * Texture_tempscalar.SampleLevel(samLinear, npos, 0);
+    }
+
+    r = saturate(r);
+    return r * modulate;
+}