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Use a simpler algorithm for the stencil buffer as the old one was too slow

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This commit is contained in:
Magnus Norddahl 2016-11-12 13:50:28 +01:00
commit e3dc9c93b9
6 changed files with 44 additions and 85 deletions
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52
src/r_compiler/fixedfunction/drawtrianglecodegen.cpp
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@ -520,75 +520,41 @@ void DrawTriangleCodegen::StencilSet(SSAInt x, SSAInt y, SSAUByte value)
SSAInt mask = StencilBlockMask.load(false);
SSAIfBlock branchNeedsUpdate;
branchNeedsUpdate.if_block(!(mask == SSAInt(0xffffffff) && StencilBlock[0].load(false) == value));
branchNeedsUpdate.if_block(!(mask == (SSAInt(0xffffff00) | value.zext_int())));
SSAIfBlock branchFirstSet;
branchFirstSet.if_block(mask == SSAInt(0xffffffff));
branchFirstSet.if_block((mask & SSAInt(0xffffff00)) == SSAInt(0xffffff00));
{
SSAUByte val0 = StencilBlock[0].load(false);
for (int i = 1; i < 8 * 8; i++)
SSAUByte val0 = mask.trunc_ubyte();
for (int i = 0; i < 8 * 8; i++)
StencilBlock[i].store(val0);
StencilBlockMask.store(SSAInt(0));
}
branchFirstSet.end_block();
SSAIfBlock branchNeedsUpdate2;
branchNeedsUpdate2.if_block(!(StencilBlock[x + y * 8].load(false) == value));
StencilBlock[x + y * 8].store(value);
SSAInt leveloffset = SSAInt(0);
for (int i = 1; i < 4; i++)
{
x = x >> 1;
y = y >> 1;
SSABool differs =
!(StencilBlock[(x << i) + (y << i) * 8].load(false) == value &&
StencilBlock[((x + 1) << i) + (y << i) * 8].load(false) == value &&
StencilBlock[(x << i) + ((y + 1) << i) * 8].load(false) == value &&
StencilBlock[((x + 1) << i) + ((y + 1) << i) * 8].load(false) == value);
SSAInt levelbit = SSAInt(1) << (leveloffset + x + y * (8 >> i));
mask = differs.select(mask & ~levelbit, mask | levelbit);
leveloffset = leveloffset + (SSAInt(8) >> leveloffset) * (SSAInt(8) >> leveloffset);
}
SSABool differs =
!(StencilBlock[0].load(false) == value &&
StencilBlock[4].load(false) == value &&
StencilBlock[4 * 8].load(false) == value &&
StencilBlock[4 * 8 + 4].load(false) == value);
mask = differs.select(mask & ~(1 << 22), mask | (1 << 22));
StencilBlockMask.store(mask);
branchNeedsUpdate2.end_block();
branchNeedsUpdate.end_block();
}
SSAUByte DrawTriangleCodegen::StencilGet(SSAInt x, SSAInt y)
{
SSABool oneValueBlock = StencilBlockMask.load(false) == SSAInt(0xffffffff);
return oneValueBlock.select(StencilBlock[0].load(false), StencilBlock[x + y * 8].load(false));
return StencilIsSingleValue().select(StencilBlockMask.load(false).trunc_ubyte(), StencilBlock[x + y * 8].load(false));
}
SSAUByte DrawTriangleCodegen::StencilGetSingle()
{
return StencilBlock[0].load(false);
return StencilBlockMask.load(false).trunc_ubyte();
}
void DrawTriangleCodegen::StencilClear(SSAUByte value)
{
StencilBlock[0].store(value);
StencilBlockMask.store(SSAInt(0xffffffff));
StencilBlockMask.store(SSAInt(0xffffff00) | value.zext_int());
}
SSABool DrawTriangleCodegen::StencilIsSingleValue()
{
return StencilBlockMask.load(false) == SSAInt(0xffffffff);
return (StencilBlockMask.load(false) & SSAInt(0xffffff00)) == SSAInt(0xffffff00);
}
void DrawTriangleCodegen::LoadArgs(TriDrawVariant variant, bool truecolor, SSAValue args, SSAValue thread_data)