mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
109 lines
2.8 KiB
Go
109 lines
2.8 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, t, err := opengl.NewZeroRenderTarget(screenWidth*screenScale, screenHeight*screenScale, true)
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if err != nil {
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return nil, err
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}
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screen, err := idsInstance.createRenderTarget(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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c := &graphicsContext{
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currents: make([]*RenderTarget, 1),
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defaultR: &RenderTarget{r, &Texture{t}},
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screen: screen,
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screenWidth: screenWidth,
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screenHeight: screenHeight,
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screenScale: screenScale,
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}
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idsInstance.fillRenderTarget(c.screen, 0, 0, 0)
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return c, nil
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}
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type graphicsContext struct {
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screen *RenderTarget
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defaultR *RenderTarget
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currents []*RenderTarget
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screenWidth int
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screenHeight int
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screenScale int
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}
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var _ GraphicsContext = new(graphicsContext)
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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.glRenderTarget
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texture := c.screen.texture
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glTexture := texture.glTexture
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glRenderTarget.Dispose()
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glTexture.Dispose()
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}
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func (c *graphicsContext) Clear() error {
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return c.Fill(0, 0, 0)
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}
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func (c *graphicsContext) Fill(r, g, b uint8) error {
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return idsInstance.fillRenderTarget(c.currents[len(c.currents)-1], r, g, b)
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}
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func (c *graphicsContext) DrawTexture(texture *Texture, parts []TexturePart, geo GeometryMatrix, color ColorMatrix) error {
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current := c.currents[len(c.currents)-1]
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return idsInstance.drawTexture(current, texture, parts, geo, color)
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}
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func (c *graphicsContext) PushRenderTarget(renderTarget *RenderTarget) {
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c.currents = append(c.currents, renderTarget)
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}
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func (c *graphicsContext) PopRenderTarget() {
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c.currents = c.currents[:len(c.currents)-1]
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}
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func (c *graphicsContext) preUpdate() {
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c.currents = c.currents[0:1]
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c.currents[0] = c.defaultR
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c.PushRenderTarget(c.screen)
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c.Clear()
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}
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func (c *graphicsContext) postUpdate() {
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c.PopRenderTarget()
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c.Clear()
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scale := float64(c.screenScale)
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geo := GeometryMatrixI()
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geo.Concat(ScaleGeometry(scale, scale))
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DrawWholeTexture(c, c.screen.texture, geo, ColorMatrixI())
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gl.Flush()
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}
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