ShuriZma
/
dolphin
mirror of https://github.com/dolphin-emu/dolphin.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Partially fix WWE12 titantron videos. 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Source/Core/VideoCommon/PixelShaderGen.cpp
View File

@ -192,6 +192,12 @@ static inline void GeneratePixelShader(T& out, DSTALPHA_MODE dstAlphaMode, API_T
"int3 iround(float3 x) { return int3(round(x)); }\n" "int3 iround(float3 x) { return int3(round(x)); }\n"
"int4 iround(float4 x) { return int4(round(x)); }\n\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) if (ApiType == API_OPENGL)
{ {
// Declare samplers // 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); out.SetConstantsUsed(C_TEXDIMS, C_TEXDIMS+numTexgen-1);
for (unsigned int i = 0; i < numTexgen; ++i) 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 // optional perspective divides
uid_data->texMtxInfo_n_projection |= xfmem.texMtxInfo[i].projection << i; uid_data->texMtxInfo_n_projection |= xfmem.texMtxInfo[i].projection << i;
if (xfmem.texMtxInfo[i].projection == XF_TEXPROJ_STQ) if (xfmem.texMtxInfo[i].projection == XF_TEXPROJ_STQ)