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Software: Fix scissor rectangle always being block-aligned

This commit is contained in:
Pokechu22 2021-11-20 15:21:43 -08:00
parent 8745d84949
commit 4d1e1db3c5
1 changed files with 16 additions and 9 deletions
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25
Source/Core/VideoBackends/Software/Rasterizer.cpp
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@ -419,20 +419,23 @@ static void DrawTriangleFrontFace(const OutputVertexData* v0, const OutputVertex
if (DY31 < 0 || (DY31 == 0 && DX31 > 0))
C3++;
// Start in corner of 8x8 block
minx &= ~(BLOCK_SIZE - 1);
miny &= ~(BLOCK_SIZE - 1);
// Start in corner of 2x2 block
s32 block_minx = minx & ~(BLOCK_SIZE - 1);
s32 block_miny = miny & ~(BLOCK_SIZE - 1);
// Loop through blocks
for (s32 y = miny; y < maxy; y += BLOCK_SIZE)
for (s32 y = block_miny & ~(BLOCK_SIZE - 1); y < maxy; y += BLOCK_SIZE)
{
for (s32 x = minx; x < maxx; x += BLOCK_SIZE)
for (s32 x = block_minx; x < maxx; x += BLOCK_SIZE)
{
s32 x1_ = (x + BLOCK_SIZE - 1);
s32 y1_ = (y + BLOCK_SIZE - 1);
// Corners of block
s32 x0 = x << 4;
s32 x1 = (x + BLOCK_SIZE - 1) << 4;
s32 x1 = x1_ << 4;
s32 y0 = y << 4;
s32 y1 = (y + BLOCK_SIZE - 1) << 4;
s32 y1 = y1_ << 4;
// Evaluate half-space functions
bool a00 = C1 + DX12 * y0 - DY12 * x0 > 0;
@ -460,7 +463,8 @@ static void DrawTriangleFrontFace(const OutputVertexData* v0, const OutputVertex
BuildBlock(x, y);
// Accept whole block when totally covered
if (a == 0xF && b == 0xF && c == 0xF)
// We still need to check min/max x/y because of the scissor
if (a == 0xF && b == 0xF && c == 0xF && x >= minx && x1_ < maxx && y >= miny && y1_ < maxy)
{
for (s32 iy = 0; iy < BLOCK_SIZE; iy++)
{
@ -486,7 +490,10 @@ static void DrawTriangleFrontFace(const OutputVertexData* v0, const OutputVertex
{
if (CX1 > 0 && CX2 > 0 && CX3 > 0)
{
Draw(x + ix, y + iy, ix, iy);
// This check enforces the scissor rectangle, since it might not be aligned with the
// blocks
if (x + ix >= minx && x + ix < maxx && y + iy >= miny && y + iy < maxy)
Draw(x + ix, y + iy, ix, iy);
}
CX1 -= FDY12;