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[d3d9] Only apply viewport zBias if minZ is below 0.5

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Fixes Space Marine shadows.
Tests show that Windows D3D9 (Nvidia) works like that.
This commit is contained in:
Robin Kertels 2023-03-23 04:30:47 +01:00 committed by Joshie
parent 4b74d1a97b
commit d11878e793
1 changed files with 7 additions and 1 deletions
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8
src/d3d9/d3d9_device.cpp
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@ -5673,7 +5673,13 @@ namespace dxvk {
// How much to bias MinZ by to avoid a depth
// degenerate viewport.
constexpr float zBias = 0.001f;
// Tests show that the bias is only applied below minZ values of 0.5
float zBias;
if (vp.MinZ >= 0.5f) {
zBias = 0.0f;
} else {
zBias = 0.001f;
}
viewport = VkViewport{
float(vp.X) + cf, float(vp.Height + vp.Y) + cf,