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Fix software rasterizer #415

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Fix software rasterizer #415

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7f14de2
initial software renderer fixes
shidemuri Jun 13, 2026
7ae9149
fix stage 2 background disappearing
shidemuri Jun 13, 2026
202d9b9
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jun 13, 2026
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12 changes: 10 additions & 2 deletions src/graphics/Software.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -369,7 +369,14 @@ inline ZunVec3 Software::ProjectToNDC(ZunVec3 vertex, ZunMatrix mv, ZunMatrix p,
viewZ = clip.z;
clip = p * clip;
ZunVec3 ndc = {clip.x, clip.y, clip.z};
if (clip.w != 0)

// this is probably incorrect but at least it prevents background on stage 2 from breaking without adding complexity
if (clip.w <= 0)
{
W = 1.0f;
return ndc;
}
else
{
ndc /= clip.w;
W = 1.0f / clip.w;
Expand Down Expand Up @@ -568,7 +575,8 @@ void Software::Draw(PrimitiveType type, i32 start, i32 count)
f32 depth;
if (useDepthTest)
{
depth = ((ndcZ * clipW) * 0.5f + 0.5f) * depthDif + depthNear;
depth = ZUN_MAX(ZUN_MIN(((ndcZ * clipW) * 0.5f + 0.5f) * depthDif + depthNear, depthFar),
depthNear);
if (depthFunc == DEPTH_FUNC_LEQUAL && depth > depthBuffer[pixelCoord])
{
continue;
Expand Down