mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 03:38:55 +01:00
116 lines
2.7 KiB
Go
116 lines
2.7 KiB
Go
// Copyright 2018 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 ebiten
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import (
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"github.com/hajimehoshi/ebiten/internal/graphics"
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"github.com/hajimehoshi/ebiten/internal/opengl"
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"github.com/hajimehoshi/ebiten/internal/packing"
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"github.com/hajimehoshi/ebiten/internal/restorable"
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"github.com/hajimehoshi/ebiten/internal/sync"
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)
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type sharedImage struct {
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restorable *restorable.Image
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page packing.Page
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}
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var (
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theSharedImages = []*sharedImage{}
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)
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type sharedImagePart struct {
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sharedImage *sharedImage
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node *packing.Node
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}
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func (s *sharedImagePart) image() *restorable.Image {
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return s.sharedImage.restorable
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}
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func (s *sharedImagePart) region() (x, y, width, height int) {
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return s.node.Region()
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}
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func (s *sharedImagePart) Dispose() {
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s.sharedImage.page.Free(s.node)
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if s.sharedImage.page.IsEmpty() {
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s.sharedImage.restorable.Dispose()
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s.sharedImage.restorable = nil
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index := -1
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for i, sh := range theSharedImages {
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if sh == s.sharedImage {
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index = i
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break
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}
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}
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if index == -1 {
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panic("not reached")
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}
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theSharedImages = append(theSharedImages[:index], theSharedImages[index+1:]...)
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}
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}
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var sharedImageLock sync.Mutex
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func newSharedImagePart(width, height int) *sharedImagePart {
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sharedImageLock.Lock()
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sharedImageLock.Unlock()
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if width > packing.MaxSize || height > packing.MaxSize {
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return nil
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}
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for _, s := range theSharedImages {
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for {
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if n := s.page.Alloc(width, height); n != nil {
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return &sharedImagePart{
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sharedImage: s,
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node: n,
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}
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}
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if !s.page.Extend() {
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break
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}
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newSharedImage := restorable.NewImage(s.page.Size(), s.page.Size(), false)
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newSharedImage.DrawImage(s.restorable, 0, 0, s.page.Size(), s.page.Size(), nil, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
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s.restorable.Dispose()
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s.restorable = newSharedImage
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}
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}
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s := &sharedImage{}
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var n *packing.Node
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for {
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n = s.page.Alloc(width, height)
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if n != nil {
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break
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}
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if !s.page.Extend() {
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break
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}
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}
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if n == nil {
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panic("not reached")
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}
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s.restorable = restorable.NewImage(s.page.Size(), s.page.Size(), false)
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theSharedImages = append(theSharedImages, s)
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return &sharedImagePart{
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sharedImage: s,
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node: n,
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}
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}
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