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VertexShaderGen: Move the sonic epsilon hack to the vertex shader.

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In the vertex shader we have control over the depth clipping planes,
so we don't have to offset every floating point value and lose accuracy.
This commit is contained in:
Jules Blok
2016-08-31 01:54:05 +02:00
parent 081cad709a
commit debaf63fe8
2 changed files with 7 additions and 7 deletions
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7
Source/Core/VideoCommon/VertexShaderGen.cpp
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@ -408,8 +408,11 @@ ShaderCode GenerateVertexShaderCode(APIType api_type, const vertex_shader_uid_da
// Since we're adjusting z for the depth range before the perspective divide, we have to do our
// own clipping. We want to clip so that -w <= z <= 0, which matches the console -1..0 range.
out.Write("o.clipDist0 = o.pos.z + o.pos.w;\n"); // Near: z < -w
out.Write("o.clipDist1 = -o.pos.z;\n"); // Far: z > 0
// We adjust our depth value for clipping purposes to match the perspective projection in the
// software backend, which is a hack to fix Sonic Adventure and Unleashed games.
out.Write("float clipDepth = o.pos.z * (1.0 - 1e-7);\n");
out.Write("o.clipDist0 = clipDepth + o.pos.w;\n"); // Near: z < -w
out.Write("o.clipDist1 = -clipDepth;\n"); // Far: z > 0
// Adjust z for the depth range. We're using an equation which incorperates a depth inversion,
// so we can map the console -1..0 range to the 0..1 range used in the depth buffer.