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op/paint: add opacity operation

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The new paint.PushOpacity allows for adjusting the opacity of a group
of drawing operations.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2023-09-07 14:44:56 -05:00
parent ae43d18ced
commit ae3bd2a1e1
8 changed files with 270 additions and 53 deletions
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gpu/path.go
+8 -8
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@@ -90,10 +90,10 @@ type intersectUniforms struct {
}
type fboSet struct {
fbos []stencilFBO
fbos []FBO
}
type stencilFBO struct {
type FBO struct {
size image.Point
tex driver.Texture
}
@@ -247,10 +247,10 @@ func newStenciler(ctx driver.Device) *stenciler {
return st
}
func (s *fboSet) resize(ctx driver.Device, sizes []image.Point) {
func (s *fboSet) resize(ctx driver.Device, format driver.TextureFormat, sizes []image.Point) {
// Add fbos.
for i := len(s.fbos); i < len(sizes); i++ {
s.fbos = append(s.fbos, stencilFBO{})
s.fbos = append(s.fbos, FBO{})
}
// Resize fbos.
for i, sz := range sizes {
@@ -273,7 +273,7 @@ func (s *fboSet) resize(ctx driver.Device, sizes []image.Point) {
if sz.X > max {
sz.X = max
}
tex, err := ctx.NewTexture(driver.TextureFormatFloat, sz.X, sz.Y, driver.FilterNearest, driver.FilterNearest,
tex, err := ctx.NewTexture(format, sz.X, sz.Y, driver.FilterNearest, driver.FilterNearest,
driver.BufferBindingTexture|driver.BufferBindingFramebuffer)
if err != nil {
panic(err)
@@ -340,15 +340,15 @@ func (s *stenciler) beginIntersect(sizes []image.Point) {
// 8 bit coverage is enough, but OpenGL ES only supports single channel
// floating point formats. Replace with GL_RGB+GL_UNSIGNED_BYTE if
// no floating point support is available.
s.intersections.resize(s.ctx, sizes)
s.intersections.resize(s.ctx, driver.TextureFormatFloat, sizes)
}
func (s *stenciler) cover(idx int) stencilFBO {
func (s *stenciler) cover(idx int) FBO {
return s.fbos.fbos[idx]
}
func (s *stenciler) begin(sizes []image.Point) {
s.fbos.resize(s.ctx, sizes)
s.fbos.resize(s.ctx, driver.TextureFormatFloat, sizes)
}
func (s *stenciler) stencilPath(bounds image.Rectangle, offset f32.Point, uv image.Point, data pathData) {