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graphics: Fix small issues in mipmap

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* Create images for negative mipmap from its next image so that
  the scale is not too big.
* Some variables usages were not correct.
This commit is contained in:
Hajime Hoshi 2019-07-31 09:20:24 +09:00
parent 215e9e5c66
commit ab0a6f4ff7
1 changed files with 29 additions and 23 deletions
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52
mipmap.go
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@ -60,26 +60,6 @@ func (m *mipmap) level(r image.Rectangle, level int) *shareable.Image {
return img
}
size := r.Size()
w, h := size.X, size.Y
w2, h2 := w, h
if level > 0 {
for i := 0; i < level; i++ {
w2 /= 2
h2 /= 2
if w == 0 || h == 0 {
imgs[level] = nil
return nil
}
}
} else {
for i := 0; i < -level; i++ {
w2 *= 2
h2 *= 2
}
}
var src *shareable.Image
vs := vertexSlice(4)
var filter driver.Filter
@ -94,18 +74,44 @@ func (m *mipmap) level(r image.Rectangle, level int) *shareable.Image {
imgs[level] = nil
return nil
}
w, h := src.Size()
graphics.PutQuadVertices(vs, src, 0, 0, w, h, 0.5, 0, 0, 0.5, 0, 0, 1, 1, 1, 1)
filter = driver.FilterLinear
case level < 0:
case level == -1:
src = m.orig
s := pow2(-level)
graphics.PutQuadVertices(vs, src, r.Min.X, r.Min.Y, r.Max.X, r.Max.Y, s, 0, 0, s, 0, 0, 1, 1, 1, 1)
graphics.PutQuadVertices(vs, src, r.Min.X, r.Min.Y, r.Max.X, r.Max.Y, 2, 0, 0, 2, 0, 0, 1, 1, 1, 1)
filter = driver.FilterNearest
case level < -1:
src = m.level(r, level+1)
if src == nil {
imgs[level] = nil
return nil
}
w, h := src.Size()
graphics.PutQuadVertices(vs, src, 0, 0, w, h, 2, 0, 0, 2, 0, 0, 1, 1, 1, 1)
filter = driver.FilterNearest
default:
panic(fmt.Sprintf("ebiten: invalid level: %d", level))
}
is := graphics.QuadIndices()
size := r.Size()
w2, h2 := size.X, size.Y
if level > 0 {
for i := 0; i < level; i++ {
w2 /= 2
h2 /= 2
if w2 == 0 || h2 == 0 {
imgs[level] = nil
return nil
}
}
} else {
for i := 0; i < -level; i++ {
w2 *= 2
h2 *= 2
}
}
s := shareable.NewImage(w2, h2)
s.DrawTriangles(src, vs, is, nil, driver.CompositeModeCopy, filter, driver.AddressClampToZero)
imgs[level] = s