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more precise rasterization

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This commit is contained in:
Thomas Friedel 2019-04-17 13:01:38 +02:00
parent 973e410204
commit 4d0f41cc6b
1 changed files with 8 additions and 2 deletions
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10
backend/software/triangles.go
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@ -19,10 +19,10 @@ func triangleLR(tri [][2]float64, y float64) (l, r float64, outside bool) {
} }
// check general bounds // check general bounds
if y < a[1] { if y <= a[1] {
return a[0], a[0], true return a[0], a[0], true
} }
if y >= c[1] { if y > c[1] {
return c[0], c[0], true return c[0], c[0], true
} }
@ -73,6 +73,9 @@ func (b *SoftwareBackend) fillTriangle(tri [][2]float64, fn func(x, y int)) {
} else if r > float64(b.w) { } else if r > float64(b.w) {
r = float64(b.w) r = float64(b.w)
} }
if l >= r {
continue
}
fl, cr := int(math.Floor(l)), int(math.Ceil(r)) fl, cr := int(math.Floor(l)), int(math.Ceil(r))
for x := fl; x <= cr; x++ { for x := fl; x <= cr; x++ {
fx := float64(x) + 0.5 fx := float64(x) + 0.5
@ -127,6 +130,9 @@ func (b *SoftwareBackend) fillQuad(quad [4][2]float64, fn func(x, y int, sx, sy
} else if r > float64(b.w) { } else if r > float64(b.w) {
r = float64(b.w) r = float64(b.w)
} }
if l >= r {
continue
}
v0 := [2]float64{float64(l) - quad[0][0], float64(y) - quad[0][1]} v0 := [2]float64{float64(l) - quad[0][0], float64(y) - quad[0][1]}
sx0 := topv[0]*v0[0] + topv[1]*v0[1] sx0 := topv[0]*v0[0] + topv[1]*v0[1]