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softgpu: Correct accounting for pixel center.

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Filtering is still not perfect but this makes different orientations
better.
This commit is contained in:
Unknown W. Brackets committed 2022-02-20 10:50:59 -08:00
1 parent df1a91ee25
commit ff5edb2bbc
1 file changed
+5 -5
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GPU/Software/Rasterizer.cpp
+5 -5
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@@ -893,8 +893,8 @@ void DrawRectangle(const VertexData &v0, const VertexData &v1, const BinCoords &
int entireY1 = std::min(v0.screenpos.y, v1.screenpos.y);
int entireX2 = std::max(v0.screenpos.x, v1.screenpos.x) - 1;
int entireY2 = std::max(v0.screenpos.y, v1.screenpos.y) - 1;
int minX = std::max(entireX1, range.x1);
int minY = std::max(entireY1, range.y1);
int minX = std::max(entireX1, range.x1) | (SCREEN_SCALE_FACTOR / 2 - 1);
int minY = std::max(entireY1, range.y1) | (SCREEN_SCALE_FACTOR / 2 - 1);
int maxX = std::min(entireX2, range.x2);
int maxY = std::min(entireY2, range.y2);
@@ -927,7 +927,7 @@ void DrawRectangle(const VertexData &v0, const VertexData &v1, const BinCoords &
} else {
// BL to TR, rotated. We start at TL still.
// X moves T (not S) toward v1, and Y moves S away from v1.
rowST = Vec2f(tc1.s() - diffS / diffY, tc0.t());
rowST = Vec2f(tc1.s(), tc0.t());
stx = Vec2f(0.0f, 2.0f * diffT / diffX);
sty = Vec2f(2.0f * -diffS / diffY, 0.0f);
}
@@ -935,12 +935,12 @@ void DrawRectangle(const VertexData &v0, const VertexData &v1, const BinCoords &
if (v0.screenpos.y < v1.screenpos.y) {
// TR to BL. Like BL to TR, rotated.
// X moves T (not s) away from v1, and Y moves S toward v1.
rowST = Vec2f(tc0.s(), tc1.t() - diffT / diffX);
rowST = Vec2f(tc0.s(), tc1.t());
stx = Vec2f(0.0f, 2.0f * -diffT / diffX);
sty = Vec2f(2.0f * diffS / diffY, 0.0f);
} else {
// BR to TL, just inverse of TL to BR.
rowST = Vec2f(tc1.s() - diffS / diffX, tc1.t() - diffT / diffY);
rowST = Vec2f(tc1.s(), tc1.t());
stx = Vec2f(2.0f * -diffS / diffX, 0.0f);
sty = Vec2f(0.0f, 2.0f * -diffT / diffY);
}