mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
119 lines
2.7 KiB
Go
119 lines
2.7 KiB
Go
// Copyright 2017 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package restorable
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import (
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"github.com/hajimehoshi/ebiten/internal/opengl"
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"github.com/hajimehoshi/ebiten/internal/sync"
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)
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type images struct {
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images map[*Image]struct{}
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m sync.Mutex
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lastChecked *Image
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}
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var theImages = &images{
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images: map[*Image]struct{}{},
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}
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func ResolveStalePixels(context *opengl.Context) error {
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return theImages.resolveStalePixels(context)
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}
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func Restore(context *opengl.Context) error {
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return theImages.restore(context)
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}
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func ClearVolatileImages() {
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theImages.clearVolatileImages()
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}
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func (i *images) add(img *Image) {
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i.m.Lock()
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defer i.m.Unlock()
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i.images[img] = struct{}{}
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}
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func (i *images) remove(img *Image) {
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i.m.Lock()
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defer i.m.Unlock()
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delete(i.images, img)
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}
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func (i *images) resolveStalePixels(context *opengl.Context) error {
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i.m.Lock()
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defer i.m.Unlock()
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i.lastChecked = nil
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for img := range i.images {
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if err := img.resolveStalePixels(context); err != nil {
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return err
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}
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}
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return nil
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}
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func (i *images) resetPixelsIfDependingOn(target *Image) {
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i.m.Lock()
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defer i.m.Unlock()
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if target == nil {
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// disposed
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return
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}
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if i.lastChecked == target {
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return
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}
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i.lastChecked = target
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for img := range i.images {
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img.makeStaleIfDependingOn(target)
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}
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}
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func (i *images) restore(context *opengl.Context) error {
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i.m.Lock()
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defer i.m.Unlock()
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// Framebuffers/textures cannot be disposed since framebuffers/textures that
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// don't belong to the current context.
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imagesWithoutDependency := []*Image{}
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imagesWithDependency := []*Image{}
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for img := range i.images {
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if img.hasDependency() {
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imagesWithDependency = append(imagesWithDependency, img)
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} else {
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imagesWithoutDependency = append(imagesWithoutDependency, img)
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}
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}
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// Images depending on other images should be processed first.
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for _, img := range imagesWithoutDependency {
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if err := img.restore(context); err != nil {
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return err
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}
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}
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for _, img := range imagesWithDependency {
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if err := img.restore(context); err != nil {
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return err
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}
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}
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return nil
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}
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func (i *images) clearVolatileImages() {
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i.m.Lock()
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defer i.m.Unlock()
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for img := range i.images {
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img.clearIfVolatile()
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}
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}
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