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internal/atlas: add comments

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Hajime Hoshi 2024-06-30 22:22:27 +09:00
parent 5b8fd9733c
commit ec7ef5e6a3
1 changed files with 10 additions and 0 deletions
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10
internal/atlas/image.go
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@ -97,6 +97,8 @@ func putImagesOnSourceBackend() {
imagesToPutOnSourceBackend.clear() imagesToPutOnSourceBackend.clear()
} }
// backend is a big texture atlas that can have multiple images.
// backend is a texture in GPU.
type backend struct { type backend struct {
// image is an atlas on which there might be multiple images. // image is an atlas on which there might be multiple images.
image *graphicscommand.Image image *graphicscommand.Image
@ -109,6 +111,7 @@ type backend struct {
page *packing.Page page *packing.Page
// source reports whether this backend is mainly used a rendering source, but this is not 100%. // source reports whether this backend is mainly used a rendering source, but this is not 100%.
//
// If a non-source (destination) image is used as a source many times, // If a non-source (destination) image is used as a source many times,
// the image's backend might be turned into a source backend to optimize draw calls. // the image's backend might be turned into a source backend to optimize draw calls.
source bool source bool
@ -220,11 +223,18 @@ var (
deferredM sync.Mutex deferredM sync.Mutex
) )
// ImageType represents the type of an image.
type ImageType int type ImageType int
const ( const (
// ImageTypeRegular is a regular image, that can be on a big texture atlas (backend).
ImageTypeRegular ImageType = iota ImageTypeRegular ImageType = iota
// ImageTypeScreen is a screen image that is not on an atlas.
// A screen image is also unmanaged.
ImageTypeScreen ImageTypeScreen
// ImageTypeUnmanaged is an unmanaged image that is not on an atlas.
ImageTypeUnmanaged ImageTypeUnmanaged
) )