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gpu: don't automatically clear screen before rendering

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Gio UI may be overlaid on top of custom graphics such as in the glfw example.
That will only work if Gio doesn't clear the screen (to white).

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-01-22 18:33:34 +01:00
parent 686d680ea3
commit 84b586ae6c
5 changed files with 35 additions and 6 deletions
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gpu/compute.go
+10 -2
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@@ -230,6 +230,11 @@ func (g *compute) Collect(viewport image.Point, ops *op.Ops) {
}
}
func (g *compute) Clear(col color.NRGBA) {
g.drawOps.clear = true
g.drawOps.clearColor = f32color.LinearFromSRGB(col)
}
func (g *compute) Frame() error {
viewport := g.drawOps.viewport
tileDims := image.Point{
@@ -285,8 +290,11 @@ func (g *compute) encode(viewport image.Point) {
// Flip Y-axis.
flipY := f32.Affine2D{}.Scale(f32.Pt(0, 0), f32.Pt(1, -1)).Offset(f32.Pt(0, float32(viewport.Y)))
g.enc.transform(flipY)
g.enc.rect(f32.Rectangle{Max: layout.FPt(viewport)}, false)
g.enc.fill(f32color.NRGBAToRGBA(g.drawOps.clearColor.SRGB()))
if g.drawOps.clear {
g.drawOps.clear = false
g.enc.rect(f32.Rectangle{Max: layout.FPt(viewport)}, false)
g.enc.fill(f32color.NRGBAToRGBA(g.drawOps.clearColor.SRGB()))
}
g.encodeOps(flipY, viewport, g.drawOps.allImageOps)
}