mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 03:08:54 +01:00
116 lines
2.9 KiB
Go
116 lines
2.9 KiB
Go
// Copyright 2014 Hajime Hoshi
|
|
//
|
|
// 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 ebiten
|
|
|
|
import (
|
|
"github.com/hajimehoshi/ebiten/internal/graphics"
|
|
"github.com/hajimehoshi/ebiten/internal/ui"
|
|
)
|
|
|
|
func newGraphicsContext(f func(*Image) error) *graphicsContext {
|
|
return &graphicsContext{
|
|
f: f,
|
|
}
|
|
}
|
|
|
|
type graphicsContext struct {
|
|
f func(*Image) error
|
|
screen *Image
|
|
defaultRenderTarget *Image
|
|
screenScale int
|
|
imageTasksDone bool
|
|
}
|
|
|
|
func (c *graphicsContext) SetSize(screenWidth, screenHeight, screenScale int) error {
|
|
if c.defaultRenderTarget != nil {
|
|
c.defaultRenderTarget.Dispose()
|
|
}
|
|
if c.screen != nil {
|
|
c.screen.Dispose()
|
|
}
|
|
screen, err := NewImage(screenWidth, screenHeight, FilterNearest)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
c.defaultRenderTarget, err = newImageWithZeroFramebuffer(screenWidth*screenScale, screenHeight*screenScale)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
c.defaultRenderTarget.Clear()
|
|
c.screen = screen
|
|
c.screenScale = screenScale
|
|
return nil
|
|
}
|
|
|
|
func (c *graphicsContext) Update() error {
|
|
if !c.imageTasksDone {
|
|
if err := graphics.Initialize(ui.GLContext()); err != nil {
|
|
return err
|
|
}
|
|
// This execution is called here because we can say actual GL function calls
|
|
// should be done here (especailly on mobiles).
|
|
if err := theDelayedImageTasks.exec(); err != nil {
|
|
return err
|
|
}
|
|
c.imageTasksDone = true
|
|
}
|
|
if err := c.screen.Clear(); err != nil {
|
|
return err
|
|
}
|
|
if err := c.f(c.screen); err != nil {
|
|
return err
|
|
}
|
|
if IsRunningSlowly() {
|
|
return nil
|
|
}
|
|
if err := c.defaultRenderTarget.Clear(); err != nil {
|
|
return err
|
|
}
|
|
scale := float64(c.screenScale)
|
|
options := &DrawImageOptions{}
|
|
options.GeoM.Scale(scale, scale)
|
|
if err := c.defaultRenderTarget.DrawImage(c.screen, options); err != nil {
|
|
return err
|
|
}
|
|
// Call glFlush to prevent black flicking (especially on Android (#226)).
|
|
ui.GLContext().Flush()
|
|
return nil
|
|
}
|
|
|
|
func (c *graphicsContext) Pause() error {
|
|
if err := theImages.evacuatePixels(); err != nil {
|
|
return err
|
|
}
|
|
if err := graphics.Finalize(ui.GLContext()); err != nil {
|
|
return err
|
|
}
|
|
ui.GLContext().Pause()
|
|
return nil
|
|
}
|
|
|
|
func (c *graphicsContext) Resume() error {
|
|
ui.GLContext().Resume()
|
|
if !c.imageTasksDone {
|
|
return nil
|
|
}
|
|
if err := graphics.Initialize(ui.GLContext()); err != nil {
|
|
return err
|
|
}
|
|
if err := theImages.restorePixels(); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|