ebiten/internal/restorable/images.go
2024-09-07 16:54:20 +09:00

126 lines
3.6 KiB
Go

// Copyright 2017 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package restorable
import (
"github.com/hajimehoshi/ebiten/v2/internal/debug"
"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
)
func alwaysReadPixelsFromGPU() bool {
return true
}
// images is a set of Image objects.
type images struct {
images map[*Image]struct{}
shaders map[*Shader]struct{}
lastTarget *Image
}
// theImages represents the images for the current process.
var theImages = &images{
images: map[*Image]struct{}{},
shaders: map[*Shader]struct{}{},
}
func SwapBuffers(graphicsDriver graphicsdriver.Graphics) error {
if debug.IsDebug {
debug.FrameLogf("Internal image sizes:\n")
imgs := make([]*graphicscommand.Image, 0, len(theImages.images))
for i := range theImages.images {
imgs = append(imgs, i.image)
}
graphicscommand.LogImagesInfo(imgs)
}
if err := graphicscommand.FlushCommands(graphicsDriver, true); err != nil {
return err
}
return nil
}
// DumpImages dumps all the current images to the specified directory.
//
// This is for testing usage.
func DumpImages(graphicsDriver graphicsdriver.Graphics, dir string) (string, error) {
images := make([]*graphicscommand.Image, 0, len(theImages.images))
for img := range theImages.images {
images = append(images, img.image)
}
return graphicscommand.DumpImages(images, graphicsDriver, dir)
}
// add adds img to the images.
func (i *images) add(img *Image) {
i.images[img] = struct{}{}
}
func (i *images) addShader(shader *Shader) {
i.shaders[shader] = struct{}{}
}
// remove removes img from the images.
func (i *images) remove(img *Image) {
i.makeStaleIfDependingOn(img)
delete(i.images, img)
}
func (i *images) removeShader(shader *Shader) {
i.makeStaleIfDependingOnShader(shader)
delete(i.shaders, shader)
}
// makeStaleIfDependingOn makes all the images stale that depend on target.
//
// When target is modified, all images depending on target can't be restored with target.
// makeStaleIfDependingOn is called in such situation.
func (i *images) makeStaleIfDependingOn(target *Image) {
if target == nil {
panic("restorable: target must not be nil at makeStaleIfDependingOn")
}
if i.lastTarget == target {
return
}
i.lastTarget = target
for img := range i.images {
img.makeStaleIfDependingOn(target)
}
}
// makeStaleIfDependingOn makes all the images stale that depend on shader.
func (i *images) makeStaleIfDependingOnShader(shader *Shader) {
if shader == nil {
panic("restorable: shader must not be nil at makeStaleIfDependingOnShader")
}
for img := range i.images {
img.makeStaleIfDependingOnShader(shader)
}
}
var graphicsDriverInitialized bool
// InitializeGraphicsDriverState initializes the graphics driver state.
func InitializeGraphicsDriverState(graphicsDriver graphicsdriver.Graphics) error {
graphicsDriverInitialized = true
return graphicscommand.InitializeGraphicsDriverState(graphicsDriver)
}
// MaxImageSize returns the maximum size of an image.
func MaxImageSize(graphicsDriver graphicsdriver.Graphics) int {
return graphicscommand.MaxImageSize(graphicsDriver)
}