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Reduce number of divisions in screenspace transform. 

This is closer to what the hardware does anyway.
This commit is contained in:
Scott Mansell 2015-01-16 04:01:00 +13:00
parent add59b3bea
commit 128d303656
1 changed files with 4 additions and 4 deletions
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8
Source/Core/VideoCommon/VertexManagerBase.cpp
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@ -264,11 +264,11 @@ void VertexManager::CalculateZSlope(u32 stride)
VertexShaderManager::TransformToClipSpace(&vtx[i * 3], &out[i * 4]);
// Transform to Screenspace
float w = out[3 + i * 4];
float inv_w = 1.0f / out[3 + i * 4];
out[0 + i * 4] = out[0 + i * 4] / w * xfmem.viewport.wd + viewOffset[0];
out[1 + i * 4] = out[1 + i * 4] / w * xfmem.viewport.ht + viewOffset[1];
out[2 + i * 4] = out[2 + i * 4] / w * xfmem.viewport.zRange + xfmem.viewport.farZ;
out[0 + i * 4] = out[0 + i * 4] * inv_w * xfmem.viewport.wd + viewOffset[0];
out[1 + i * 4] = out[1 + i * 4] * inv_w * xfmem.viewport.ht + viewOffset[1];
out[2 + i * 4] = out[2 + i * 4] * inv_w * xfmem.viewport.zRange + xfmem.viewport.farZ;
}
float dx31 = out[8] - out[0];