mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
111 lines
2.4 KiB
Go
111 lines
2.4 KiB
Go
package opengl
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import (
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"github.com/go-gl/gl"
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"github.com/hajimehoshi/ebiten/graphics"
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"github.com/hajimehoshi/ebiten/graphics/matrix"
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"sync"
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)
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func flush() {
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gl.Flush()
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}
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var onceInit sync.Once
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type Context struct {
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screenId graphics.RenderTargetId
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defaultId graphics.RenderTargetId
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currentId graphics.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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func NewContext(screenWidth, screenHeight, screenScale int) *Context {
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onceInit.Do(func() {
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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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})
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context := &Context{
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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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defaultRenderTarget := &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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context.defaultId = idsInstance.addRenderTarget(defaultRenderTarget)
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var err error
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context.screenId, err = idsInstance.createRenderTarget(screenWidth, screenHeight, graphics.FilterNearest)
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if err != nil {
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panic("initializing the offscreen failed: " + err.Error())
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}
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context.ResetOffscreen()
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context.Clear()
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return context
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}
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func (c *Context) Dispose() {
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// TODO: remove the default framebuffer?
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idsInstance.deleteRenderTarget(c.screenId)
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}
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// TODO: This interface is confusing: Can we change this?
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func (c *Context) Update(draw func(graphics.Context)) {
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c.ResetOffscreen()
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c.Clear()
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draw(c)
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c.SetOffscreen(c.defaultId)
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c.Clear()
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scale := float64(c.screenScale)
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geo := matrix.GeometryI()
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geo.Scale(scale, scale)
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graphics.DrawWhole(c.RenderTarget(c.screenId), c.screenWidth, c.screenHeight, geo, matrix.ColorI())
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flush()
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}
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func (c *Context) Clear() {
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c.Fill(0, 0, 0)
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}
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func (c *Context) Fill(r, g, b uint8) {
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idsInstance.fillRenderTarget(c.currentId, r, g, b)
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}
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func (c *Context) Texture(id graphics.TextureId) graphics.Drawer {
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return &textureWithContext{id, c}
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}
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func (c *Context) RenderTarget(id graphics.RenderTargetId) graphics.Drawer {
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return &textureWithContext{idsInstance.toTexture(id), c}
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}
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func (c *Context) ResetOffscreen() {
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c.currentId = c.screenId
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}
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func (c *Context) SetOffscreen(renderTargetId graphics.RenderTargetId) {
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c.currentId = renderTargetId
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}
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type textureWithContext struct {
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id graphics.TextureId
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context *Context
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}
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func (t *textureWithContext) Draw(parts []graphics.TexturePart, geo matrix.Geometry, color matrix.Color) {
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idsInstance.drawTexture(t.context.currentId, t.id, parts, geo, color)
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}
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