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internal/mipmap: Create a mipmap map lazily

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This commit is contained in:
Hajime Hoshi 2021-09-20 23:27:14 +09:00
parent 9dbff2cddd
commit 81fd7ab8f6
1 changed files with 14 additions and 6 deletions
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20
internal/mipmap/mipmap.go
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@ -48,7 +48,6 @@ func New(width, height int) *Mipmap {
width: width, width: width,
height: height, height: height,
orig: buffered.NewImage(width, height), orig: buffered.NewImage(width, height),
imgs: map[int]*buffered.Image{},
} }
} }
@ -57,7 +56,6 @@ func NewScreenFramebufferMipmap(width, height int) *Mipmap {
width: width, width: width,
height: height, height: height,
orig: buffered.NewScreenFramebufferImage(width, height), orig: buffered.NewScreenFramebufferImage(width, height),
imgs: map[int]*buffered.Image{},
} }
} }
@ -167,6 +165,16 @@ func (m *Mipmap) DrawTriangles(srcs [graphics.ShaderImageNum]*Mipmap, vertices [
m.disposeMipmaps() m.disposeMipmaps()
} }
func (m *Mipmap) setImg(level int, img *buffered.Image) {
if m.imgs == nil {
if img == nil {
return
}
m.imgs = map[int]*buffered.Image{}
}
m.imgs[level] = img
}
func (m *Mipmap) level(level int) *buffered.Image { func (m *Mipmap) level(level int) *buffered.Image {
if level == 0 { if level == 0 {
panic("ebiten: level must be non-zero at level") panic("ebiten: level must be non-zero at level")
@ -191,7 +199,7 @@ func (m *Mipmap) level(level int) *buffered.Image {
case level > 1: case level > 1:
src = m.level(level - 1) src = m.level(level - 1)
if src == nil { if src == nil {
m.imgs[level] = nil m.setImg(level, nil)
return nil return nil
} }
w := sizeForLevel(m.width, level-1) w := sizeForLevel(m.width, level-1)
@ -206,14 +214,14 @@ func (m *Mipmap) level(level int) *buffered.Image {
w2 := sizeForLevel(m.width, level-1) w2 := sizeForLevel(m.width, level-1)
h2 := sizeForLevel(m.height, level-1) h2 := sizeForLevel(m.height, level-1)
if w2 == 0 || h2 == 0 { if w2 == 0 || h2 == 0 {
m.imgs[level] = nil m.setImg(level, nil)
return nil return nil
} }
// buffered.NewImage panics with a too big size when actual allocation happens. // buffered.NewImage panics with a too big size when actual allocation happens.
// 4096 should be a safe size in most environments (#1399). // 4096 should be a safe size in most environments (#1399).
// Unfortunately a precise max image size cannot be obtained here since this requires GPU access. // Unfortunately a precise max image size cannot be obtained here since this requires GPU access.
if w2 > 4096 || h2 > 4096 { if w2 > 4096 || h2 > 4096 {
m.imgs[level] = nil m.setImg(level, nil)
return nil return nil
} }
s := buffered.NewImage(w2, h2) s := buffered.NewImage(w2, h2)
@ -226,7 +234,7 @@ func (m *Mipmap) level(level int) *buffered.Image {
Height: float32(h2), Height: float32(h2),
} }
s.DrawTriangles([graphics.ShaderImageNum]*buffered.Image{src}, vs, is, affine.ColorMIdentity{}, driver.CompositeModeCopy, filter, driver.AddressUnsafe, dstRegion, driver.Region{}, [graphics.ShaderImageNum - 1][2]float32{}, nil, nil, false) s.DrawTriangles([graphics.ShaderImageNum]*buffered.Image{src}, vs, is, affine.ColorMIdentity{}, driver.CompositeModeCopy, filter, driver.AddressUnsafe, dstRegion, driver.Region{}, [graphics.ShaderImageNum - 1][2]float32{}, nil, nil, false)
m.imgs[level] = s m.setImg(level, s)
return m.imgs[level] return m.imgs[level]
} }