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app/internal/gpu: clip in floating point

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Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-10-17 15:30:37 +02:00
parent 0c75e7c605
commit 42d2c98455
1 changed files with 26 additions and 13 deletions
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app/internal/gpu/gpu.go
+26 -13
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@@ -576,7 +576,7 @@ func (r *renderer) intersectPath(p *pathOp, clip image.Rectangle) {
}
fbo := r.pather.stenciler.cover(p.place.Idx)
r.ctx.BindTexture(gl.TEXTURE_2D, fbo.tex)
coverScale, coverOff := texSpaceTransform(uv, fbo.size)
coverScale, coverOff := texSpaceTransform(toRectF(uv), fbo.size)
r.ctx.Uniform2f(r.pather.stenciler.uIntersectUVScale, coverScale.X, coverScale.Y)
r.ctx.Uniform2f(r.pather.stenciler.uIntersectUVOffset, coverOff.X, coverOff.Y)
r.ctx.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
@@ -652,6 +652,19 @@ func boundRectF(r f32.Rectangle) image.Rectangle {
}
}
func toRectF(r image.Rectangle) f32.Rectangle {
return f32.Rectangle{
Min: f32.Point{
X: float32(r.Min.X),
Y: float32(r.Min.Y),
},
Max: f32.Point{
X: float32(r.Max.X),
Y: float32(r.Max.Y),
},
}
}
func ceil(v float32) int {
return int(math.Ceil(float64(v)))
}
@@ -802,21 +815,21 @@ func (d *drawState) materialFor(cache *resourceCache, rect f32.Rectangle, off f3
} else {
m.material = materialTexture
dr := boundRectF(rect.Add(off))
sr := image.Rectangle{
Max: d.imgSize,
sr := f32.Rectangle{
Max: f32.Point{X: float32(d.imgSize.X), Y: float32(d.imgSize.Y)},
}
if dx := dr.Dx(); dx != 0 {
if dx := float32(dr.Dx()); dx != 0 {
// Don't clip 1 px width sources.
if sdx := sr.Dx(); sdx > 1 {
sr.Min.X += ((clip.Min.X-dr.Min.X)*sdx + dx/2) / dx
sr.Max.X -= ((dr.Max.X-clip.Max.X)*sdx + dx/2) / dx
sr.Min.X += (float32(clip.Min.X-dr.Min.X)*sdx + dx/2) / dx
sr.Max.X -= (float32(dr.Max.X-clip.Max.X)*sdx + dx/2) / dx
}
}
if dy := dr.Dy(); dy != 0 {
if dy := float32(dr.Dy()); dy != 0 {
// Don't clip 1 px height sources.
if sdy := sr.Dy(); sdy > 1 {
sr.Min.Y += ((clip.Min.Y-dr.Min.Y)*sdy + dy/2) / dy
sr.Max.Y -= ((dr.Max.Y-clip.Max.Y)*sdy + dy/2) / dy
sr.Min.Y += (float32(clip.Min.Y-dr.Min.Y)*sdy + dy/2) / dy
sr.Max.Y -= (float32(dr.Max.Y-clip.Max.Y)*sdy + dy/2) / dy
}
}
tex, exists := cache.get(d.img)
@@ -895,7 +908,7 @@ func (r *renderer) drawOps(ops []imageOp) {
Min: img.place.Pos,
Max: img.place.Pos.Add(drc.Size()),
}
coverScale, coverOff := texSpaceTransform(uv, fbo.size)
coverScale, coverOff := texSpaceTransform(toRectF(uv), fbo.size)
r.pather.cover(img.z, m.material, m.color, scale, off, m.uvScale, m.uvOffset, coverScale, coverOff)
}
r.ctx.DisableVertexAttribArray(attribPos)
@@ -951,10 +964,10 @@ func (b *blitter) blit(z float32, mat materialType, col [4]float32, scale, off,
// texSpaceTransform return the scale and offset that transforms the given subimage
// into quad texture coordinates.
func texSpaceTransform(r image.Rectangle, bounds image.Point) (f32.Point, f32.Point) {
func texSpaceTransform(r f32.Rectangle, bounds image.Point) (f32.Point, f32.Point) {
size := f32.Point{X: float32(bounds.X), Y: float32(bounds.Y)}
scale := f32.Point{X: float32(r.Dx()) / size.X, Y: float32(r.Dy()) / size.Y}
offset := f32.Point{X: float32(r.Min.X) / size.X, Y: float32(r.Min.Y) / size.Y}
scale := f32.Point{X: r.Dx() / size.X, Y: r.Dy() / size.Y}
offset := f32.Point{X: r.Min.X / size.X, Y: r.Min.Y / size.Y}
return scale, offset
}