#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl"
#include "Packages/com.unity.render-pipelines.high-definition/Runtime/ShaderLibrary/ShaderVariables.hlsl"

#pragma only_renderers d3d11 playstation xboxone xboxseries vulkan metal switch

#pragma kernel KMain

#pragma multi_compile _ ENABLE_ALPHA

#include "Packages/com.unity.render-pipelines.high-definition/Runtime/PostProcessing/Shaders/PostProcessDefines.hlsl"

TEXTURE2D_X(_InputTexture);

RW_TEXTURE2D_X(CTYPE, _OutputTexture);

SAMPLER(sampler_LinearClamp);

CBUFFER_START(cb0)
    float4 _TexelSize;       // xy: size, zw: texel size
CBUFFER_END

#define GROUP_SIZE 8

[numthreads(GROUP_SIZE, GROUP_SIZE, 1)]
void KMain(uint3 dispatchThreadId : SV_DispatchThreadID)
{
    UNITY_XR_ASSIGN_VIEW_INDEX(dispatchThreadId.z);

    PositionInputs posInputs = GetPositionInput(float2(dispatchThreadId.xy), _TexelSize.zw, uint2(GROUP_SIZE, GROUP_SIZE));
    float2 uv =ClampAndScaleUVForBilinear(posInputs.positionNDC);
    _OutputTexture[COORD_TEXTURE2D_X(posInputs.positionSS)] = SAMPLE_TEXTURE2D_X_LOD(_InputTexture, sampler_LinearClamp, uv, 0.0).CTYPE_SWIZZLE;
}