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Made commit 0920f6c a little more robust.

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Eliminated division-by-zero when depth range is zero.
This commit is contained in:
Victor Xie 2016-02-01 13:17:15 +08:00
parent 0151552ddc
commit dc32805256
1 changed files with 3 additions and 2 deletions
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5
GPU/Common/GPUStateUtils.cpp
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@ -16,6 +16,7 @@
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
#include <algorithm>
#include <limits>
#include "Common/StringUtils.h"
#include "Core/Config.h"
@ -679,9 +680,9 @@ void ConvertViewportAndScissor(bool useBufferedRendering, float renderWidth, flo
// Okay. So, in our shader, -1 will map to minz, and +1 will map to maxz.
float halfActualZRange = (maxz - minz) * (1.0f / 2.0f);
float zScale = vpZScale / halfActualZRange;
float zScale = halfActualZRange < std::numeric_limits<float>::epsilon() ? 1.0f : vpZScale / halfActualZRange;
// This adjusts the center from halfActualZRange to vpZCenter.
float zOffset = (vpZCenter - (minz + halfActualZRange)) / halfActualZRange;
float zOffset = halfActualZRange < std::numeric_limits<float>::epsilon() ? 0.0f : (vpZCenter - (minz + halfActualZRange)) / halfActualZRange;
out.depthRangeMin = ToScaledDepthFromInteger(minz);
out.depthRangeMax = ToScaledDepthFromInteger(maxz);