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GPU: Allow depth above 65535.

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Hopefully it rounds down for any == or <= tests.
This commit is contained in:
Unknown W. Brackets 2023-01-31 17:57:49 -08:00
parent e0db28899c
commit 08ac34bae0
1 changed files with 8 additions and 1 deletions
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9
GPU/Common/GPUStateUtils.cpp
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@ -521,7 +521,7 @@ float ToScaledDepthFromIntegerScale(float z) {
const float depthSliceFactor = DepthSliceFactor();
if (gstate_c.Use(GPU_SCALE_DEPTH_FROM_24BIT_TO_16BIT)) {
const double doffset = 0.5 * (depthSliceFactor - 1.0) * (1.0 / depthSliceFactor);
// Use one bit for each value, rather than 1.0 / (25535.0 * 256.0).
// Use one bit for each value, rather than 1.0 / (65535.0 * 256.0).
return (float)((double)z * (1.0 / 16777215.0) + doffset);
} else {
const float offset = 0.5f * (depthSliceFactor - 1.0f) * (1.0f / depthSliceFactor);
@ -730,6 +730,12 @@ void ConvertViewportAndScissor(bool useBufferedRendering, float renderWidth, flo
if (maxz == 65535) {
maxz += fullDepthRange;
}
} else if (maxz == 65535) {
// This means clamp isn't enabled, but we still want to allow values up to 65535.99.
// If DepthSliceFactor() is 1.0, though, this would make out.depthRangeMax exceed 1.
// Since that would clamp, it would make Z=1234 not match between draws when maxz changes.
if (DepthSliceFactor() > 1.0f)
maxz = 65535.99f;
}
// Okay. So, in our shader, -1 will map to minz, and +1 will map to maxz.
float halfActualZRange = (maxz - minz) * (1.0f / 2.0f);
@ -748,6 +754,7 @@ void ConvertViewportAndScissor(bool useBufferedRendering, float renderWidth, flo
}
// OpenGL will clamp these for us anyway, and Direct3D will error if not clamped.
// Of course, if this happens we've skewed out.depthScale/out.zOffset and may get z-fighting.
out.depthRangeMin = std::max(out.depthRangeMin, 0.0f);
out.depthRangeMax = std::min(out.depthRangeMax, 1.0f);
}