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Wojtek Figat
2020-12-07 23:40:54 +01:00
commit 6fb9eee74c
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Source/Shaders/Gather.hlsl Normal file
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// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
#ifndef __GATHER__
#define __GATHER__
#include "./Flax/Common.hlsl"
float4 TextureGatherRed(Texture2D tex, SamplerState sam, float2 uv)
{
#if CAN_USE_GATHER
return tex.GatherRed(sam, uv);
#else
float x = tex.Sample(sam, uv, int2(0, 1)).x;
float y = tex.Sample(sam, uv, int2(1, 1)).x;
float z = tex.Sample(sam, uv, int2(1, 0)).x;
float w = tex.Sample(sam, uv, int2(0, 0)).x;
return float4(x, y, z, w);
#endif
}
float4 TextureGatherRed(Texture2DArray tex, SamplerState sam, float3 uv)
{
#if CAN_USE_GATHER
return tex.GatherRed(sam, uv);
#else
float x = tex.Sample(sam, uv, int2(0, 1)).x;
float y = tex.Sample(sam, uv, int2(1, 1)).x;
float z = tex.Sample(sam, uv, int2(1, 0)).x;
float w = tex.Sample(sam, uv, int2(0, 0)).x;
return float4(x, y, z, w);
#endif
}
float4 TextureGatherRed(Texture2D tex, SamplerState sam, float2 uv, int2 offset)
{
#if CAN_USE_GATHER
return tex.GatherRed(sam, uv, offset);
#else
float x = tex.Sample(sam, uv, offset + int2(0, 1)).x;
float y = tex.Sample(sam, uv, offset + int2(1, 1)).x;
float z = tex.Sample(sam, uv, offset + int2(1, 0)).x;
float w = tex.Sample(sam, uv, offset + int2(0, 0)).x;
return float4(x, y, z, w);
#endif
}
float4 TextureGatherRed(Texture2D<float> tex, SamplerState sam, float2 uv)
{
#if CAN_USE_GATHER
return tex.GatherRed(sam, uv);
#else
float x = tex.Sample(sam, uv, int2(0, 1)).x;
float y = tex.Sample(sam, uv, int2(1, 1)).x;
float z = tex.Sample(sam, uv, int2(1, 0)).x;
float w = tex.Sample(sam, uv, int2(0, 0)).x;
return float4(x, y, z, w);
#endif
}
float4 TextureGatherRed(Texture2D<float> tex, SamplerState sam, float2 uv, int2 offset)
{
#if CAN_USE_GATHER
return tex.GatherRed(sam, uv, offset);
#else
float x = tex.Sample(sam, uv, offset + int2(0, 1)).x;
float y = tex.Sample(sam, uv, offset + int2(1, 1)).x;
float z = tex.Sample(sam, uv, offset + int2(1, 0)).x;
float w = tex.Sample(sam, uv, offset + int2(0, 0)).x;
return float4(x, y, z, w);
#endif
}
#endif