ebiten/graphicscontext.go

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// 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.
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package ebiten
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import (
"github.com/hajimehoshi/ebiten/internal/graphics"
"github.com/hajimehoshi/ebiten/internal/ui"
)
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func newGraphicsContext(f func(*Image) error) *graphicsContext {
return &graphicsContext{
f: f,
}
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}
type graphicsContext struct {
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f func(*Image) error
screen *Image
defaultRenderTarget *Image
screenScale int
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initialized bool
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}
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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 {
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if !c.initialized {
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if err := graphics.Initialize(ui.GLContext()); err != nil {
return err
}
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c.initialized = true
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}
if err := c.screen.Clear(); err != nil {
return err
}
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if err := c.f(c.screen); err != nil {
return err
}
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if IsRunningSlowly() {
return nil
}
if err := c.defaultRenderTarget.Clear(); err != nil {
return err
}
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scale := float64(c.screenScale)
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options := &DrawImageOptions{}
options.GeoM.Scale(scale, scale)
if err := c.defaultRenderTarget.DrawImage(c.screen, options); err != nil {
return err
}
if err := c.flush(); err != nil {
return err
}
return nil
}
func (c *graphicsContext) flush() error {
// TODO: imageM is necessary to call graphics functions. Move this to graphics package.
imageM.Lock()
defer imageM.Unlock()
if err := graphics.FlushCommands(ui.GLContext()); err != nil {
return err
}
// Call glFlush to prevent black flicking (especially on Android (#226)).
ui.GLContext().Flush()
return nil
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}
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func (c *graphicsContext) Resume() error {
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ui.GLContext().Resume()
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if !c.initialized {
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return nil
}
if err := graphics.Initialize(ui.GLContext()); err != nil {
return err
}
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if err := theImages.restorePixels(ui.GLContext()); err != nil {
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return err
}
return nil
}