mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
78 lines
2.0 KiB
Go
78 lines
2.0 KiB
Go
// Copyright 2014 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ebiten
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import (
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"github.com/hajimehoshi/ebiten/internal/graphics"
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"github.com/hajimehoshi/ebiten/internal/opengl"
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)
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func newGraphicsContext(c *opengl.Context, screenWidth, screenHeight, screenScale int) (*graphicsContext, error) {
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f, err := graphics.NewZeroFramebuffer(c, screenWidth*screenScale, screenHeight*screenScale)
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if err != nil {
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return nil, err
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}
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texture, err := graphics.NewTexture(c, screenWidth, screenHeight, c.Nearest)
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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(c, texture)
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if err != nil {
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return nil, err
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}
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return &graphicsContext{
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glContext: c,
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defaultR: &innerImage{f, nil},
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screen: screen,
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screenScale: screenScale,
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}, nil
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}
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type graphicsContext struct {
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glContext *opengl.Context
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screen *innerImage
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defaultR *innerImage
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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.
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framebuffer := c.screen.framebuffer
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texture := c.screen.texture
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framebuffer.Dispose(c.glContext)
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texture.Dispose(c.glContext)
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}
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func (c *graphicsContext) preUpdate() error {
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return c.screen.Clear(c.glContext)
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}
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func (c *graphicsContext) postUpdate() error {
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if err := c.defaultR.Clear(c.glContext); err != nil {
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return err
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}
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scale := float64(c.screenScale)
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options := &DrawImageOptions{}
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options.GeoM.Scale(scale, scale)
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if err := c.defaultR.drawImage(c.glContext, c.screen, options); err != nil {
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return err
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}
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return nil
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}
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