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Software: Fix zfreeze with CullMode::All

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This commit is contained in:
Pokechu22
2021-11-29 17:51:02 -08:00
parent 164e0f742d
commit 59f299d5d6
7 changed files with 78 additions and 41 deletions
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70
Source/Core/VideoBackends/Software/Clipper.cpp
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@ -289,10 +289,42 @@ void ProcessTriangle(OutputVertexData* v0, OutputVertexData* v1, OutputVertexDat
{
INCSTAT(g_stats.this_frame.num_triangles_in)
bool backface;
if (!CullTest(v0, v1, v2, backface))
if (IsTriviallyRejected(v0, v1, v2))
{
INCSTAT(g_stats.this_frame.num_triangles_rejected)
// NOTE: The slope used by zfreeze shouldn't be updated if the triangle is
// trivially rejected during clipping
return;
}
bool backface = IsBackface(v0, v1, v2);
if (!backface)
{
if (bpmem.genMode.cullmode == CullMode::Back || bpmem.genMode.cullmode == CullMode::All)
{
// cull frontfacing - we still need to update the slope for zfreeze
PerspectiveDivide(v0);
PerspectiveDivide(v1);
PerspectiveDivide(v2);
Rasterizer::UpdateZSlope(v0, v1, v2);
INCSTAT(g_stats.this_frame.num_triangles_culled)
return;
}
}
else
{
if (bpmem.genMode.cullmode == CullMode::Front || bpmem.genMode.cullmode == CullMode::All)
{
// cull backfacing - we still need to update the slope for zfreeze
PerspectiveDivide(v0);
PerspectiveDivide(v2);
PerspectiveDivide(v1);
Rasterizer::UpdateZSlope(v0, v2, v1);
INCSTAT(g_stats.this_frame.num_triangles_culled)
return;
}
}
int indices[NUM_INDICES] = {0, 1, 2, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG,
SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG, SKIP_FLAG,
@ -461,19 +493,18 @@ void ProcessPoint(OutputVertexData* center)
Rasterizer::DrawTriangleFrontFace(&ur, &lr, &ul);
}
bool CullTest(const OutputVertexData* v0, const OutputVertexData* v1, const OutputVertexData* v2,
bool& backface)
bool IsTriviallyRejected(const OutputVertexData* v0, const OutputVertexData* v1,
const OutputVertexData* v2)
{
int mask = CalcClipMask(v0);
mask &= CalcClipMask(v1);
mask &= CalcClipMask(v2);
if (mask)
{
INCSTAT(g_stats.this_frame.num_triangles_rejected)
return false;
}
return mask != 0;
}
bool IsBackface(const OutputVertexData* v0, const OutputVertexData* v1, const OutputVertexData* v2)
{
float x0 = v0->projectedPosition.x;
float x1 = v1->projectedPosition.x;
float x2 = v2->projectedPosition.x;
@ -486,29 +517,14 @@ bool CullTest(const OutputVertexData* v0, const OutputVertexData* v1, const Outp
float normalZDir = (x0 * w2 - x2 * w0) * y1 + (x2 * y0 - x0 * y2) * w1 + (y2 * w0 - y0 * w2) * x1;
backface = normalZDir <= 0.0f;
bool backface = normalZDir <= 0.0f;
// Jimmie Johnson's Anything with an Engine has a positive viewport, while other games have a
// negative viewport. The positive viewport does not require vertices to be vertically mirrored,
// but the backface test does need to be inverted for things to be drawn.
if (xfmem.viewport.ht > 0)
backface = !backface;
// TODO: Are these tests / the definition of backface above backwards?
if ((bpmem.genMode.cullmode == CullMode::Back || bpmem.genMode.cullmode == CullMode::All) &&
!backface) // cull frontfacing
{
INCSTAT(g_stats.this_frame.num_triangles_culled)
return false;
}
if ((bpmem.genMode.cullmode == CullMode::Front || bpmem.genMode.cullmode == CullMode::All) &&
backface) // cull backfacing
{
INCSTAT(g_stats.this_frame.num_triangles_culled)
return false;
}
return true;
return backface;
}
void PerspectiveDivide(OutputVertexData* vertex)