Laplacian.compute

#pragma kernel CSMain

Texture2D<float4> srcTex;
RWTexture2D<float4> dstTex;

[numthreads(32, 32, 1)]
void CSMain(uint3 id : SV_DispatchThreadID) {
	float4 up = srcTex[id.xy + int2(0, 1)];
	float4 down = srcTex[id.xy + int2(0, -1)];
	float4 left = srcTex[id.xy + int2(-1, 0)];
	float4 right = srcTex[id.xy + int2(1, 0)];
	float4 middle = -4.0 * srcTex[id.xy];

	float4 sum = middle + up + down + left + right;
	sum.w = 1.0;
	dstTex[id.xy] = sum;
}