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Partially fix WWE12 titantron videos.

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The obvious question here is, why does it matter if we round or truncate?
The key is that GC/Wii does fixed-point interpolation, where PC GPUs do
floating-point interpolation. Discarding fractional bits makes the conversion
from floating-point to fixed point give more consistent results.

I'm not confident this is really the right fix, or that my explanation is
completely correct; ideally, we don't want to depend on floating-point
interpolation at all.
This commit is contained in:
magumagu 2015-02-18 19:29:02 -08:00
parent c8c61041ba
commit 4cdf9f543f
1 changed files with 7 additions and 1 deletions
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8
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -192,6 +192,12 @@ static inline void GeneratePixelShader(T& out, DSTALPHA_MODE dstAlphaMode, API_T
"int3 iround(float3 x) { return int3(round(x)); }\n"
"int4 iround(float4 x) { return int4(round(x)); }\n\n");
out.Write("int itrunc(float x) { return int (trunc(x)); }\n"
"int2 itrunc(float2 x) { return int2(trunc(x)); }\n"
"int3 itrunc(float3 x) { return int3(trunc(x)); }\n"
"int4 itrunc(float4 x) { return int4(trunc(x)); }\n\n");
if (ApiType == API_OPENGL)
{
// Declare samplers
@ -430,7 +436,7 @@ static inline void GeneratePixelShader(T& out, DSTALPHA_MODE dstAlphaMode, API_T
out.SetConstantsUsed(C_TEXDIMS, C_TEXDIMS+numTexgen-1);
for (unsigned int i = 0; i < numTexgen; ++i)
{
out.Write("\tint2 fixpoint_uv%d = iround(", i);
out.Write("\tint2 fixpoint_uv%d = itrunc(", i);
// optional perspective divides
uid_data->texMtxInfo_n_projection |= xfmem.texMtxInfo[i].projection << i;
if (xfmem.texMtxInfo[i].projection == XF_TEXPROJ_STQ)