mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
/*
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Copyright 2014 Hajime Hoshi
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package ebiten
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import (
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"github.com/go-gl/gl"
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"github.com/hajimehoshi/ebiten/internal/opengl"
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)
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func newGraphicsContext(screenWidth, screenHeight, screenScale int) (*graphicsContext, error) {
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r, err := opengl.NewZeroRenderTarget(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 := opengl.NewTexture(screenWidth, screenHeight, gl.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(texture, gl.NEAREST)
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if err != nil {
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return nil, err
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}
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c := &graphicsContext{
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defaultR: &innerImage{r, nil},
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screen: screen,
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screenScale: screenScale,
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}
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return c, nil
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}
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type graphicsContext struct {
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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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glRenderTarget := c.screen.renderTarget
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glTexture := c.screen.texture
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glRenderTarget.Dispose()
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glTexture.Dispose()
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}
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func (c *graphicsContext) preUpdate() error {
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return c.screen.Clear()
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}
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func (c *graphicsContext) postUpdate() error {
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// We don't need to clear the default render target (framebuffer).
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// For the default framebuffer, a special shader is used.
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scale := float64(c.screenScale)
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geo := ScaleGeometry(scale, scale)
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clr := ColorMatrixI()
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w, h := c.screen.size()
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parts := []ImagePart{
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{Rect{0, 0, float64(w), float64(h)}, Rect{0, 0, float64(w), float64(h)}},
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}
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if err := c.defaultR.drawImage(c.screen, parts, geo, clr); err != nil {
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return err
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}
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gl.Flush()
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return nil
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}
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