ebiten/graphicscontext.go
2015-01-05 10:30:33 +09:00

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