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/opengl"
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)
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func newGraphicsContext(screenWidth, screenHeight, screenScale int) (*graphicsContext, error) {
f, err := opengl.NewZeroFramebuffer(screenWidth*screenScale, screenHeight*screenScale)
if err != nil {
return nil, err
}
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texture, err := opengl.NewTexture(screenWidth, screenHeight, opengl.Filter(FilterNearest))
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if err != nil {
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return nil, err
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}
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screen, err := newInnerImage(texture)
if err != nil {
return nil, err
}
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c := &graphicsContext{
defaultR: &innerImage{f, nil},
screen: screen,
screenScale: screenScale,
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}
return c, nil
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}
type graphicsContext struct {
screen *innerImage
defaultR *innerImage
screenScale int
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}
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func (c *graphicsContext) dispose() {
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// NOTE: Now this method is not used anywhere.
framebuffer := c.screen.framebuffer
texture := c.screen.texture
framebuffer.Dispose()
texture.Dispose()
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}
func (c *graphicsContext) preUpdate() error {
return c.screen.Clear()
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}
func (c *graphicsContext) postUpdate() error {
if err := c.defaultR.Clear(); err != nil {
return err
}
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scale := float64(c.screenScale)
options := &DrawImageOptions{
GeoM: ScaleGeo(scale, scale),
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}
if err := c.defaultR.drawImage(c.screen, options); err != nil {
return err
}
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opengl.Flush()
return nil
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}