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-rw-r--r--hlsl/downsample.fx19
1 files changed, 11 insertions, 8 deletions
diff --git a/hlsl/downsample.fx b/hlsl/downsample.fx
index 376e4b8802d..4a4a8fe3743 100644
--- a/hlsl/downsample.fx
+++ b/hlsl/downsample.fx
@@ -48,15 +48,15 @@ struct PS_INPUT
//-----------------------------------------------------------------------------
uniform float2 ScreenDims;
-uniform float2 TargetSize;
+uniform float2 TargetDims;
-uniform float2 Prescale = float2(1.0f, 1.0f);
+uniform bool PrepareVector;
VS_OUTPUT vs_main(VS_INPUT Input)
{
VS_OUTPUT Output = (VS_OUTPUT)0;
- float2 TargetTexelSize = 1.0f / TargetSize;
+ float2 TargetTexelDims = 1.0f / TargetDims;
Output.Position = float4(Input.Position.xyz, 1.0f);
Output.Position.xy /= ScreenDims;
@@ -67,11 +67,14 @@ VS_OUTPUT vs_main(VS_INPUT Input)
Output.Color = Input.Color;
float2 TexCoord = Input.Position.xy / ScreenDims;
-
- Output.TexCoord01.xy = TexCoord + float2(-0.5f, -0.5f) * TargetTexelSize * Prescale;
- Output.TexCoord01.zw = TexCoord + float2( 0.5f, -0.5f) * TargetTexelSize * Prescale;
- Output.TexCoord23.xy = TexCoord + float2(-0.5f, 0.5f) * TargetTexelSize * Prescale;
- Output.TexCoord23.zw = TexCoord + float2( 0.5f, 0.5f) * TargetTexelSize * Prescale;
+ TexCoord += PrepareVector
+ ? 0.5f / TargetDims // half texel offset correction (DX9)
+ : 0.0f;
+
+ Output.TexCoord01.xy = TexCoord + float2(-0.5f, -0.5f) * TargetTexelDims;
+ Output.TexCoord01.zw = TexCoord + float2( 0.5f, -0.5f) * TargetTexelDims;
+ Output.TexCoord23.xy = TexCoord + float2(-0.5f, 0.5f) * TargetTexelDims;
+ Output.TexCoord23.zw = TexCoord + float2( 0.5f, 0.5f) * TargetTexelDims;
return Output;
}