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restorable: Merge draw image history items if possible (#379)

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This commit is contained in:
Hajime Hoshi 2017-07-02 02:21:23 +09:00
parent 979836d0f5
commit 565a28ff04
1 changed files with 21 additions and 1 deletions
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22
internal/restorable/image.go
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@ -32,6 +32,19 @@ type drawImageHistoryItem struct {
mode opengl.CompositeMode
}
func (d *drawImageHistoryItem) canMerge(image *Image, colorm *affine.ColorM, mode opengl.CompositeMode) bool {
if d.image != image {
return false
}
if !d.colorm.Equals(colorm) {
return false
}
if d.mode != mode {
return false
}
return true
}
// Image represents an image that can be restored when GL context is lost.
type Image struct {
image *graphics.Image
@ -154,9 +167,16 @@ func (p *Image) DrawImage(img *Image, vertices []float32, colorm *affine.ColorM,
}
func (p *Image) appendDrawImageHistory(image *Image, vertices []float32, colorm *affine.ColorM, mode opengl.CompositeMode) {
if p.stale {
if p.stale || p.volatile {
return
}
if len(p.drawImageHistory) > 0 {
last := p.drawImageHistory[len(p.drawImageHistory)-1]
if last.canMerge(image, colorm, mode) {
last.vertices = append(last.vertices, vertices...)
return
}
}
const maxDrawImageHistoryNum = 100
if len(p.drawImageHistory)+1 > maxDrawImageHistoryNum {
p.makeStale()