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VertexShaderGen: Correct vertex shader output to consider shifted pixel centers.

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Fixes issue 267.
This commit is contained in:
Tony Wasserka 2014-04-23 23:42:28 +02:00
commit c47c32d4a8
2 changed files with 19 additions and 0 deletions
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8
Source/Core/VideoCommon/VertexShaderGen.cpp
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@ -419,6 +419,14 @@ static inline void GenerateVertexShader(T& out, u32 components, API_TYPE api_typ
//seems to get rather complicated
}
// The console GPU places the pixel center at 7/12 in screen space unless
// antialiasing is enabled, while D3D and OpenGL place it at 0.5. This results
// in some primitives being placed one pixel too far to the bottom-right,
// which in turn can be critical if it happens for clear quads.
// Hence, we compensate for this pixel center difference so that primitives
// get rasterized correctly.
out.Write("o.pos.xy = o.pos.xy - " I_DEPTHPARAMS".zw;\n");
if (api_type == API_OPENGL)
{
// Bit ugly here