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internal/mipmap: refactoring

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This change replaces the member `volatile` with `imageType` to make
the code more explicit.

In the old code, it was not obvious whether a mipmap was used for a
screen image. Actually a mipmap was not used since `canSkipMipmap` is
always true for a screen image, but this was too tricky.
This commit is contained in:
Hajime Hoshi 2022-09-28 03:07:38 +09:00
parent 6b35ad4a88
commit 9492b4ecf5
1 changed files with 21 additions and 17 deletions
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24
internal/mipmap/mipmap.go
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@ -26,12 +26,20 @@ import (
"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
)
func canUseMipmap(imageType atlas.ImageType) bool {
switch imageType {
case atlas.ImageTypeRegular, atlas.ImageTypeUnmanaged:
return true
}
return false
}
// Mipmap is a set of buffered.Image sorted by the order of mipmap level.
// The level 0 image is a regular image and higher-level images are used for mipmap.
type Mipmap struct {
width int
height int
volatile bool
imageType atlas.ImageType
orig *buffered.Image
imgs map[int]*buffered.Image
}
@ -41,7 +49,7 @@ func New(width, height int, imageType atlas.ImageType) *Mipmap {
width: width,
height: height,
orig: buffered.NewImage(width, height, imageType),
volatile: imageType == atlas.ImageTypeVolatile,
imageType: imageType,
}
}
@ -65,7 +73,7 @@ func (m *Mipmap) DrawTriangles(srcs [graphics.ShaderImageCount]*Mipmap, vertices
level := 0
// TODO: Do we need to check all the sources' states of being volatile?
if !canSkipMipmap && srcs[0] != nil && !srcs[0].volatile {
if !canSkipMipmap && srcs[0] != nil && canUseMipmap(srcs[0].imageType) {
level = math.MaxInt32
for i := 0; i < len(indices)/3; i++ {
const n = graphics.VertexFloatCount
@ -137,8 +145,8 @@ func (m *Mipmap) level(level int) *buffered.Image {
panic("mipmap: level must be non-zero at level")
}
if m.volatile {
panic("mipmap: mipmap images for a volatile image is not implemented yet")
if !canUseMipmap(m.imageType) {
panic("mipmap: mipmap images for a volatile or a screen image is not implemented yet")
}
if img, ok := m.imgs[level]; ok {
@ -182,11 +190,7 @@ func (m *Mipmap) level(level int) *buffered.Image {
return nil
}
t := atlas.ImageTypeRegular
if m.volatile {
t = atlas.ImageTypeVolatile
}
s := buffered.NewImage(w2, h2, t)
s := buffered.NewImage(w2, h2, m.imageType)
dstRegion := graphicsdriver.Region{
X: 0,