mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
122 lines
3.1 KiB
Go
122 lines
3.1 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 opengl
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import (
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"github.com/go-gl/gl"
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"github.com/hajimehoshi/ebiten"
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)
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func Initialize(screenWidth, screenHeight, screenScale int) (*GraphicsContext, error) {
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gl.Init()
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gl.Enable(gl.TEXTURE_2D)
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gl.Enable(gl.BLEND)
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c := &GraphicsContext{
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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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// The defualt framebuffer should be 0.
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c.defaultID = idsInstance.addRenderTarget(&renderTarget{
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width: screenWidth * screenScale,
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height: screenHeight * screenScale,
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flipY: true,
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})
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var err error
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c.screenID, err = idsInstance.createRenderTarget(screenWidth, screenHeight, ebiten.FilterNearest)
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if err != nil {
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return nil, err
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}
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// TODO: This is a special stack only for clearing. Can we change this?
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c.currentIDs = []ebiten.RenderTargetID{c.screenID}
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c.Clear()
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return c, nil
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}
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type GraphicsContext struct {
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screenID ebiten.RenderTargetID
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defaultID ebiten.RenderTargetID
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currentIDs []ebiten.RenderTargetID
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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 _ ebiten.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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idsInstance.deleteRenderTarget(c.screenID)
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}
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func (c *GraphicsContext) Clear() {
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c.Fill(0, 0, 0)
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}
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func (c *GraphicsContext) Fill(r, g, b uint8) {
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idsInstance.fillRenderTarget(c.currentIDs[len(c.currentIDs)-1], r, g, b)
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}
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func (c *GraphicsContext) Texture(id ebiten.TextureID) ebiten.Drawer {
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return &textureWithContext{id, c}
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}
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func (c *GraphicsContext) RenderTarget(id ebiten.RenderTargetID) ebiten.Drawer {
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return &textureWithContext{idsInstance.toTexture(id), c}
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}
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func (c *GraphicsContext) PushOffscreen(renderTargetID ebiten.RenderTargetID) {
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c.currentIDs = append(c.currentIDs, renderTargetID)
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}
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func (c *GraphicsContext) PopOffscreen() {
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c.currentIDs = c.currentIDs[:len(c.currentIDs)-1]
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}
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func (c *GraphicsContext) PreUpdate() {
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c.currentIDs = []ebiten.RenderTargetID{c.defaultID}
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c.PushOffscreen(c.screenID)
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c.Clear()
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}
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func (c *GraphicsContext) PostUpdate() {
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c.PopOffscreen()
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c.Clear()
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scale := float64(c.screenScale)
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geo := ebiten.GeometryMatrixI()
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geo.Scale(scale, scale)
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ebiten.DrawWhole(c.RenderTarget(c.screenID), c.screenWidth, c.screenHeight, geo, ebiten.ColorMatrixI())
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gl.Flush()
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}
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type textureWithContext struct {
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id ebiten.TextureID
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context *GraphicsContext
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}
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func (t *textureWithContext) Draw(parts []ebiten.TexturePart, geo ebiten.GeometryMatrix, color ebiten.ColorMatrix) {
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currentID := t.context.currentIDs[len(t.context.currentIDs)-1]
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idsInstance.drawTexture(currentID, t.id, parts, geo, color)
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}
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