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VertexShaderGen: Correct for negative viewport dimensions.

This commit is contained in:
Jules Blok 2017-03-16 12:33:51 +01:00
parent bb708397db
commit cbfb07152f
1 changed files with 4 additions and 0 deletions
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4
Source/Core/VideoCommon/VertexShaderGen.cpp
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@ -453,6 +453,10 @@ ShaderCode GenerateVertexShaderCode(APIType api_type, const vertex_shader_uid_da
out.Write("o.pos.z = o.pos.z * 2.0 - o.pos.w;\n"); out.Write("o.pos.z = o.pos.z * 2.0 - o.pos.w;\n");
} }
// Correct for negative viewports by mirroring all vertices. We need to negate the height here,
// since the viewport height is already negated by the render backend.
out.Write("o.pos.xy *= sign(" I_PIXELCENTERCORRECTION ".xy * float2(1.0, -1.0));\n");
// The console GPU places the pixel center at 7/12 in screen space unless // 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 // 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, // in some primitives being placed one pixel too far to the bottom-right,