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GPU: Round texture coordinates instead of flooring

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Fixes misaligned textures in some games such as Crash Bandicoot.

Currently, because the vertex offset is not applied at >1x resolution
scale, this will not work so it is disabled at >1x.
This commit is contained in:
Connor McLaughlin
2020-04-26 19:15:49 +10:00
parent d1e841f55d
commit 98ff136f67
2 changed files with 15 additions and 8 deletions
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5
src/core/gpu_hw_shadergen.cpp
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@ -118,6 +118,7 @@ void GPU_HW_ShaderGen::WriteHeader(std::stringstream& ss)
else
{
ss << "#define HLSL 1\n";
ss << "#define roundEven round\n";
ss << "#define CONSTANT static const\n";
ss << "#define VECTOR_EQ(a, b) (all((a) == (b)))\n";
ss << "#define VECTOR_NEQ(a, b) (any((a) != (b)))\n";
@ -602,7 +603,9 @@ float4 SampleFromVRAM(uint4 texpage, uint2 icoord)
texcol.rgb /= float3(ialpha, ialpha, ialpha);
semitransparent = (texcol.a != 0.0);
#else
float4 texcol = SampleFromVRAM(v_texpage, uint2(floor(v_tex0)));
// With the vertex offset applied at 1x resolution scale, we want to round the texture coordinates.
// Floor them otherwise, as it currently breaks when upscaling as the vertex offset is not applied.
float4 texcol = SampleFromVRAM(v_texpage, uint2((RESOLUTION_SCALE == 1u) ? roundEven(v_tex0) : floor(v_tex0)));
if (VECTOR_EQ(texcol, TRANSPARENT_PIXEL_COLOR))
discard;