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

#pragma only_renderers d3d11 playstation xboxone xboxseries vulkan metal switch

#pragma kernel KCIExyGen
#define GROUP_SIZE_X 8
#define GROUP_SIZE_Y 8

TEXTURE2D_X(_SourceTexture);
RW_TEXTURE2D_X(float, _xyBuffer);

float4 _HDRxyBufferDebugParams;
#define _SizePerDim _HDRxyBufferDebugParams.xy

float2 RGBtoxy(float3 rgb)
{
    float3 XYZ = RotateOutputSpaceToXYZ(rgb);
    return XYZ.xy / (dot(XYZ, 1));
}

[numthreads(GROUP_SIZE_X, GROUP_SIZE_Y, 1)]
void KCIExyGen(uint groupIndex : SV_GroupIndex,
    uint3 dispatchThreadId : SV_DispatchThreadID)
{
    UNITY_XR_ASSIGN_VIEW_INDEX(dispatchThreadId.z);
    float3 rgbData = LOAD_TEXTURE2D_X(_SourceTexture, dispatchThreadId.xy).rgb;

    float2 xy = (RGBtoxy(rgbData));

    _xyBuffer[COORD_TEXTURE2D_X(xy * _SizePerDim)] = 1;
}