thirdparty/ppsspp
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softgpu: Retain accuracy in depth for tests.

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Fixes intro/menu issues in Phantasy Star Portable 1/2, and text in the
first, both of which now look correct.
This commit is contained in:
Unknown W. Brackets 2013-12-15 10:53:35 -08:00
parent 6ca5662b03
commit 96d6f52a13
1 changed files with 7 additions and 1 deletions
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8
GPU/Software/Rasterizer.cpp
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@ -882,6 +882,10 @@ void DrawTriangleSlice(
w1_base += orient2dIncY(-d02.x) * 16 * y1;
w2_base += orient2dIncY(d01.x) * 16 * y1;
// All the z values are the same, no interpolation required.
// This is common, and when we interpolate, we lose accuracy.
const bool flatZ = v0.screenpos.z == v1.screenpos.z && v0.screenpos.z == v2.screenpos.z;
for (pprime.y = minY + y1 * 16; pprime.y < minY + y2 * 16; pprime.y += 16,
w0_base += orient2dIncY(d12.x)*16,
w1_base += orient2dIncY(-d02.x)*16,
@ -1013,9 +1017,11 @@ void DrawTriangleSlice(
// TODO: Fogging
u16 z = v2.screenpos.z;
// TODO: Is that the correct way to interpolate?
// Without the (u32), this causes an ICE in some versions of gcc.
u16 z = (u16)(u32)(((float)v0.screenpos.z * w0 + (float)v1.screenpos.z * w1 + (float)v2.screenpos.z * w2) * wsum);
if (!flatZ)
z = (u16)(u32)(((float)v0.screenpos.z * w0 + (float)v1.screenpos.z * w1 + (float)v2.screenpos.z * w2) * wsum);
// Depth range test
// TODO: Clear mode?