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gpu: reintroduce reuse of offset-only stenciling

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Reintroduce support for offset in stencil vertex so we can reuse
cached values if the only difference in transform is offset. Split
current transform into a pure-offset part and the rest and use
only the complex part as cache key.

Signed-off-by: Viktor <viktor.ogeman@gmail.com>
This commit is contained in:
Viktor
2020-06-20 23:29:55 +02:00
committed by Elias Naur
parent 380938c602
commit cfb9565895
4 changed files with 55 additions and 35 deletions
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gpu/path.go
+7 -4
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@@ -78,7 +78,9 @@ type stenciler struct {
type stencilUniforms struct {
vert struct {
transform [4]float32
transform [4]float32
pathOffset [2]float32
_ [8]byte // Padding to multiple of 16.
}
}
@@ -306,8 +308,8 @@ func (p *pather) begin(sizes []image.Point) {
p.stenciler.begin(sizes)
}
func (p *pather) stencilPath(bounds image.Rectangle, uv image.Point, data *pathData) {
p.stenciler.stencilPath(bounds, uv, data)
func (p *pather) stencilPath(bounds image.Rectangle, offset f32.Point, uv image.Point, data *pathData) {
p.stenciler.stencilPath(bounds, offset, uv, data)
}
func (s *stenciler) beginIntersect(sizes []image.Point) {
@@ -336,13 +338,14 @@ func (s *stenciler) begin(sizes []image.Point) {
s.ctx.BindIndexBuffer(s.indexBuf)
}
func (s *stenciler) stencilPath(bounds image.Rectangle, uv image.Point, data *pathData) {
func (s *stenciler) stencilPath(bounds image.Rectangle, offset f32.Point, uv image.Point, data *pathData) {
s.ctx.Viewport(uv.X, uv.Y, bounds.Dx(), bounds.Dy())
// Transform UI coordinates to OpenGL coordinates.
texSize := f32.Point{X: float32(bounds.Dx()), Y: float32(bounds.Dy())}
scale := f32.Point{X: 2 / texSize.X, Y: 2 / texSize.Y}
orig := f32.Point{X: -1 - float32(bounds.Min.X)*2/texSize.X, Y: -1 - float32(bounds.Min.Y)*2/texSize.Y}
s.prog.uniforms.vert.transform = [4]float32{scale.X, scale.Y, orig.X, orig.Y}
s.prog.uniforms.vert.pathOffset = [2]float32{offset.X, offset.Y}
s.prog.prog.UploadUniforms()
// Draw in batches that fit in uint16 indices.
start := 0