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PixelShaderGen: For custom textures and scaled EFB copies, use correct texel to pixel mapping when sampling textures

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(D3D9 only)

This is basically the same as revision e58692653a, just for scaled textures and with a LOT more work...
This commit is contained in:
NeoBrainX
2012-02-20 17:55:18 +01:00
parent d068686a7f
commit 9adc119e3c
8 changed files with 61 additions and 25 deletions
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5
Source/Core/VideoCommon/Src/PixelShaderGen.cpp
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@ -560,6 +560,7 @@ const char *GeneratePixelShaderCode(DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType
WRITE(p, "uniform float4 "I_KCOLORS"[4] : register(c%d);\n", C_KCOLORS);
WRITE(p, "uniform float4 "I_ALPHA"[1] : register(c%d);\n", C_ALPHA);
WRITE(p, "uniform float4 "I_TEXDIMS"[8] : register(c%d);\n", C_TEXDIMS);
WRITE(p, "uniform float4 "I_VTEXSCALE"[8] : register(c%d);\n", C_VTEXSCALE);
WRITE(p, "uniform float4 "I_ZBIAS"[2] : register(c%d);\n", C_ZBIAS);
WRITE(p, "uniform float4 "I_INDTEXSCALE"[2] : register(c%d);\n", C_INDTEXSCALE);
WRITE(p, "uniform float4 "I_INDTEXMTX"[6] : register(c%d);\n", C_INDTEXMTX);
@ -1102,9 +1103,9 @@ void SampleTexture(char *&p, const char *destination, const char *texcoords, con
WRITE(p, "%s=Tex%d.Sample(samp%d, %s.xy * "I_TEXDIMS"[%d].xy).%s;\n", destination, texmap,texmap, texcoords, texmap, texswap);
else if (ApiType & API_D3D9)
{
// D3D9 uses different pixel to texel mapping, so we need to offset our base address by half a pixel.
// D3D9 uses different pixel to texel mapping, so we need to offset our sampling address by half a pixel (assuming native and virtual texture dimensions match each other, otherwise some math is involved).
// Read the MSDN article "Directly Mapping Texels to Pixels (Direct3D 9)" for further info.
WRITE(p, "%s=tex2D(samp%d, (%s.xy + float2(0.5f,0.5f)) * "I_TEXDIMS"[%d].xy).%s;\n", destination, texmap, texcoords, texmap, texswap);
WRITE(p, "%s=tex2D(samp%d, (%s.xy + 0.5f*"I_VTEXSCALE"[%d].%s) * "I_TEXDIMS"[%d].xy).%s;\n", destination, texmap, texcoords, texmap/2, (texmap&1)?"zw":"xy", texmap, texswap);
}
else
WRITE(p, "%s=tex2D(samp%d, %s.xy * "I_TEXDIMS"[%d].xy).%s;\n", destination, texmap, texcoords, texmap, texswap);