#pragma warning(disable: 3556)      // Integer divides might be much slower, try using uints if possible.
#pragma warning(disable: 3205)      // In the conversion from larger type to smaller, a loss of data might occur.
#pragma warning(disable: 3571)      // pow(f, e) will not work for negative f, use abs(f) or conditionally handle negative values if you expect them.

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

#if defined(USE_TEXTURE2D_X_AS_ARRAY)
    #define UV_TEXTURE2D_X(uv)					float3(uv, SLICE_ARRAY_INDEX)
    #define COORD_TEXTURE2D_X_LOD(coord, lod)	uint4(coord, SLICE_ARRAY_INDEX, lod)
#else
    #define UV_TEXTURE2D_X(uv)					uv
    #define COORD_TEXTURE2D_X_LOD(coord, lod)	uint3(coord, lod)
#endif

float4 FFX_CACAO_Prepare_SampleDepthOffsets(float2 uv)
{
    float4 samples;
    samples.x = _CameraDepthTexture.SampleLevel(s_point_clamp_sampler, UV_TEXTURE2D_X(uv), 0.0f, int2(0, 2)).r;
    samples.y = _CameraDepthTexture.SampleLevel(s_point_clamp_sampler, UV_TEXTURE2D_X(uv), 0.0f, int2(2, 2)).r;
    samples.z = _CameraDepthTexture.SampleLevel(s_point_clamp_sampler, UV_TEXTURE2D_X(uv), 0.0f, int2(2, 0)).r;
    samples.w = _CameraDepthTexture.SampleLevel(s_point_clamp_sampler, UV_TEXTURE2D_X(uv), 0.0f, int2(0, 0)).r;
    return samples;
}

float4 FFX_CACAO_Prepare_GatherDepth(float2 uv)
{
    return _CameraDepthTexture.GatherRed(s_point_clamp_sampler, UV_TEXTURE2D_X(uv));
}

float FFX_CACAO_Prepare_LoadDepth(int2 coord)
{
    return _CameraDepthTexture.Load(COORD_TEXTURE2D_X_LOD(coord, 0)).r;
}

float FFX_CACAO_Prepare_LoadDepthOffset(int2 coord, int2 offset)
{
    return _CameraDepthTexture.Load(COORD_TEXTURE2D_X_LOD(coord, 0), offset).r;
}

float4 FFX_CACAO_Prepare_GatherDepthOffset(float2 uv, int2 offset)
{
    return _CameraDepthTexture.GatherRed(s_point_clamp_sampler, UV_TEXTURE2D_X(uv), offset);
}

float3 LoadSceneNormals(int2 coord)
{
    NormalData normalData;
    DecodeFromNormalBuffer(coord, normalData);
    return normalData.normalWS;
}

RW_TEXTURE2D_X(float, _OcclusionTexture);

void FFX_CACAO_Apply_StoreOutput(uint2 coord, float val)
{
    _OcclusionTexture[COORD_TEXTURE2D_X(coord)] = 1.0 - val;
}

void FFX_CACAO_BilateralUpscale_StoreOutput(uint2 coord, int2 offset, float val)
{
    _OcclusionTexture[COORD_TEXTURE2D_X(coord + offset)] = 1.0 - val;
}