Initial commit

res/shaders/LinearSolve.slang

@@ -0,0 +1,32 @@
+import FluidGridData;
+
+struct Params
+{
+    // read-write
+    FluidGridData<float> next;
+    // read-only
+    FluidGridData<float> current;
+    // read-only
+    FluidGridData<float> grid0;
+    float a;
+    float c;
+};
+ParameterBlock<Params> params;
+
+[shader("compute")]
+[numthreads(32, 8, 1)]
+void linearSolve(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    FluidGridData<float> next = params.next;
+    FluidGridData<float> current = params.current;
+    FluidGridData<float> grid0 = params.grid0;
+    float a = params.a;
+    float cRecip = 1.0f / params.c;
+
+    int x = dispatchThreadID.x + 1;
+    int y = dispatchThreadID.y + 1;
+    int z = dispatchThreadID.z + 1;
+    if(x >= gridSize.x - 1 || y >= gridSize.y - 1 || z >= gridSize.z - 1) return;
+
+    next[x, y, z] = (grid0[x, y, z] + a * (current[x + 1, y, z] + current[x - 1, y, z] + current[x, y + 1, z] + current[x, y - 1, z] + current[x, y, z + 1] + current[x, y, z - 1])) * cRecip;
+}