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#include "ShaderLibrary/Common.hlsl"
Texture2D<float> _Source;
RWTexture2D<float> _Result;
SamplerState sampler_LinearClamp;
CBUFFER_START(cb)
float4 _Size;
CBUFFER_END
#pragma kernel KMain
[numthreads(8, 8, 1)]
void KMain(uint2 groupId : SV_GroupID, uint2 groupThreadId : SV_GroupThreadID, uint2 dispatchThreadId : SV_DispatchThreadID)
{
// Upper-left pixel coordinate of quad that this thread will read
int2 threadUL = dispatchThreadId;
// Downsample the block
float2 offset = float2(threadUL);
float p00 = _Source.SampleLevel(sampler_LinearClamp, (offset ) * _Size.zw, 0.0).x;
float p10 = _Source.SampleLevel(sampler_LinearClamp, (offset + float2(1.0, 0.0)) * _Size.zw, 0.0).x;
float p01 = _Source.SampleLevel(sampler_LinearClamp, (offset + float2(0.0, 1.0)) * _Size.zw, 0.0).x;
float p11 = _Source.SampleLevel(sampler_LinearClamp, (offset + float2(1.0, 1.0)) * _Size.zw, 0.0).x;
float depth = min(min(min(p00, p01), p10), p11);
// Write to the final target
_Result[dispatchThreadId] = depth;
}