// 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{ GeoM: ScaleGeo(scale, scale), } if err := c.defaultR.drawImage(c.glContext, c.screen, options); err != nil { return err } return nil }