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Manually pass dx/dy instead of using ddx/ddy, should improve interpolation somewhat

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elasota
2020-04-25 18:54:56 -04:00
parent 5bb6b074f0
commit 3c5dd5f562
4 changed files with 130 additions and 78 deletions
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10
ShaderSrc/ScaleQuadP.hlsl
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@@ -3,6 +3,11 @@
SamplerState surfaceSampler : register(s0);
Texture2D<float3> surfaceTexture : register(t0);
cbuffer SScaleQuadPixelConstants : register(b0)
{
float4 dxdy_Unused;
};
struct SDrawQuadPixelOutput
{
float4 color : SV_TARGET;
@@ -15,8 +20,8 @@ float3 SamplePixel(int2 coord)
SDrawQuadPixelOutput PSMain(SDrawQuadPixelInput input)
{
float dx = ddx(input.texCoord.x);
float dy = ddy(input.texCoord.y);
float dx = dxdy_Unused.x;
float dy = dxdy_Unused.y;
float2 pixelTopLeftCoord = max(0.0, input.texCoord.xy - float2(dx, dy) * 0.5);
float2 pixelBottomRightCoord = pixelTopLeftCoord + min(float2(1.0, 1.0), float2(dx, dy));
@@ -37,5 +42,6 @@ SDrawQuadPixelOutput PSMain(SDrawQuadPixelInput input)
SDrawQuadPixelOutput result;
result.color = float4(interpolatedColor, 1.0);
return result;
}