mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
371 lines
8.0 KiB
Go
371 lines
8.0 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 shareable
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import (
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"fmt"
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"image"
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"image/color"
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"runtime"
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"sync"
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"github.com/hajimehoshi/ebiten/internal/affine"
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"github.com/hajimehoshi/ebiten/internal/graphics"
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"github.com/hajimehoshi/ebiten/internal/graphicsutil"
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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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)
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var (
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quadIndices = []uint16{0, 1, 2, 1, 2, 3}
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)
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type backend struct {
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restorable *restorable.Image
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// If page is nil, the backend is not shared.
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page *packing.Page
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}
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func (b *backend) TryAlloc(width, height int) (*packing.Node, bool) {
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// If the region is allocated without any extention, it's fine.
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if n := b.page.Alloc(width, height); n != nil {
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return n, true
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}
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// Simulate the extending the page and calculate the appropriate page size.
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page := b.page.Clone()
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nExtended := 0
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for {
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if !page.Extend() {
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// The page can't be extended any more. Return as failure.
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return nil, false
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}
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nExtended++
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if n := page.Alloc(width, height); n != nil {
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break
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}
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}
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for i := 0; i < nExtended; i++ {
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b.page.Extend()
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}
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s := b.page.Size()
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newImg := restorable.NewImage(s, s, false)
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oldImg := b.restorable
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w, h := oldImg.Size()
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vs := graphicsutil.QuadVertices(w, h, 0, 0, w, h, 1, 0, 0, 1, 0, 0)
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newImg.DrawImage(oldImg, vs, quadIndices, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
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oldImg.Dispose()
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b.restorable = newImg
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n := b.page.Alloc(width, height)
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if n == nil {
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panic("not reached")
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}
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return n, true
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}
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var (
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// backendsM is a mutex for critical sections of the backend and packing.Node objects.
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backendsM sync.Mutex
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// theBackends is a set of actually shared images.
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theBackends = []*backend{}
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)
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type Image struct {
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width int
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height int
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disposed bool
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backend *backend
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// If node is nil, the image is not shared.
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node *packing.Node
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}
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func (i *Image) ensureNotShared() {
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if i.backend == nil {
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i.allocate(false)
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return
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}
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if i.node == nil {
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return
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}
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x, y, w, h := i.region()
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newImg := restorable.NewImage(w, h, false)
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vw, vh := i.backend.restorable.Size()
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vs := graphicsutil.QuadVertices(vw, vh, x, y, x+w, y+h, 1, 0, 0, 1, 0, 0)
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newImg.DrawImage(i.backend.restorable, vs, quadIndices, nil, opengl.CompositeModeCopy, graphics.FilterNearest)
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i.dispose(false)
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i.backend = &backend{
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restorable: newImg,
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}
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}
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func (i *Image) region() (x, y, width, height int) {
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if i.backend == nil {
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panic("not reached")
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}
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if i.node == nil {
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w, h := i.backend.restorable.Size()
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return 0, 0, w, h
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}
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return i.node.Region()
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}
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func (i *Image) Size() (width, height int) {
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return i.width, i.height
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}
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func (i *Image) DrawImage(img *Image, sx0, sy0, sx1, sy1 int, a, b, c, d, tx, ty float32, colorm *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) {
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backendsM.Lock()
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defer backendsM.Unlock()
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if img.disposed {
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panic("shareable: the drawing source image must not be disposed")
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}
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if i.disposed {
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panic("shareable: the drawing target image must not be disposed")
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}
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if img.backend == nil {
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img.allocate(true)
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}
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i.ensureNotShared()
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// Compare i and img after ensuring i is not shared, or
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// i and img might share the same texture even though i != img.
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if i.backend.restorable == img.backend.restorable {
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panic("shareable: Image.DrawImage: img must be different from the receiver")
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}
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dx, dy, _, _ := img.region()
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w, h := img.backend.restorable.SizePowerOf2()
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vs := graphicsutil.QuadVertices(w, h, sx0+dx, sy0+dy, sx1+dx, sy1+dy, a, b, c, d, tx, ty)
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i.backend.restorable.DrawImage(img.backend.restorable, vs, quadIndices, colorm, mode, filter)
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}
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func (i *Image) ReplacePixels(p []byte) {
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backendsM.Lock()
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defer backendsM.Unlock()
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if i.disposed {
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panic("shareable: the image must not be disposed")
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}
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if i.backend == nil {
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i.allocate(true)
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}
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x, y, w, h := i.region()
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if l := 4 * w * h; len(p) != l {
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panic(fmt.Sprintf("shareable: len(p) was %d but must be %d", len(p), l))
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}
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i.backend.restorable.ReplacePixels(p, x, y, w, h)
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}
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func (i *Image) At(x, y int) (color.Color, error) {
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backendsM.Lock()
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defer backendsM.Unlock()
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if i.backend == nil {
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return color.RGBA{}, nil
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}
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ox, oy, w, h := i.region()
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if x < 0 || y < 0 || x >= w || y >= h {
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return color.RGBA{}, nil
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}
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clr, err := i.backend.restorable.At(x+ox, y+oy)
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return clr, err
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}
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func (i *Image) Dispose() {
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backendsM.Lock()
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defer backendsM.Unlock()
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i.dispose(true)
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}
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func (i *Image) dispose(markDisposed bool) {
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defer func() {
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if markDisposed {
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i.disposed = true
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}
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i.backend = nil
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i.node = nil
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runtime.SetFinalizer(i, nil)
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}()
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if i.disposed {
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return
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}
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if i.backend == nil {
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// Not allocated yet.
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return
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}
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if i.node == nil {
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i.backend.restorable.Dispose()
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return
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}
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i.backend.page.Free(i.node)
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if !i.backend.page.IsEmpty() {
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// As this part can be reused, this should be cleared explicitly.
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x0, y0, x1, y1 := i.region()
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i.backend.restorable.ReplacePixels(nil, x0, y0, x1, y1)
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return
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}
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i.backend.restorable.Dispose()
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index := -1
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for idx, sh := range theBackends {
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if sh == i.backend {
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index = idx
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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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theBackends = append(theBackends[:index], theBackends[index+1:]...)
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}
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func (i *Image) IsInvalidated() (bool, error) {
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backendsM.Lock()
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defer backendsM.Unlock()
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v, err := i.backend.restorable.IsInvalidated()
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return v, err
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}
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func NewImage(width, height int) *Image {
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// Actual allocation is done lazily.
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return &Image{
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width: width,
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height: height,
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}
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}
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func (i *Image) allocate(shareable bool) {
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if i.backend != nil {
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panic("not reached")
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}
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if !shareable || i.width > maxSize || i.height > maxSize {
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i.backend = &backend{
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restorable: restorable.NewImage(i.width, i.height, false),
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}
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return
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}
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for _, b := range theBackends {
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if n, ok := b.TryAlloc(i.width, i.height); ok {
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i.backend = b
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i.node = n
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return
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}
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}
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size := initSize
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for i.width > size || i.height > size {
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if size == maxSize {
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panic("not reached")
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}
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size *= 2
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}
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b := &backend{
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restorable: restorable.NewImage(size, size, false),
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page: packing.NewPage(size, maxSize),
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}
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theBackends = append(theBackends, b)
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n := b.page.Alloc(i.width, i.height)
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if n == nil {
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panic("not reached")
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}
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i.backend = b
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i.node = n
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runtime.SetFinalizer(i, (*Image).Dispose)
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return
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}
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func NewVolatileImage(width, height int) *Image {
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backendsM.Lock()
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defer backendsM.Unlock()
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r := restorable.NewImage(width, height, true)
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i := &Image{
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width: width,
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height: height,
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backend: &backend{
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restorable: r,
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},
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}
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runtime.SetFinalizer(i, (*Image).Dispose)
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return i
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}
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func NewScreenFramebufferImage(width, height int) *Image {
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backendsM.Lock()
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defer backendsM.Unlock()
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r := restorable.NewScreenFramebufferImage(width, height)
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i := &Image{
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width: width,
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height: height,
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backend: &backend{
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restorable: r,
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},
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}
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runtime.SetFinalizer(i, (*Image).Dispose)
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return i
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}
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func InitializeGLState() error {
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backendsM.Lock()
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defer backendsM.Unlock()
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return restorable.InitializeGLState()
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}
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func ResolveStaleImages() error {
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backendsM.Lock()
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defer backendsM.Unlock()
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return restorable.ResolveStaleImages()
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}
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func IsRestoringEnabled() bool {
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// As IsRestoringEnabled is an immutable state, no need to lock here.
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return restorable.IsRestoringEnabled()
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}
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func Restore() error {
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backendsM.Lock()
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defer backendsM.Unlock()
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return restorable.Restore()
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}
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func Images() ([]image.Image, error) {
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backendsM.Lock()
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defer backendsM.Unlock()
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return restorable.Images()
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}
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