mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 21:32:20 +02:00
113 lines
2.5 KiB
Go
113 lines
2.5 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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"github.com/hajimehoshi/ebiten/ui"
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)
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type ContextUpdater struct {
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context *context
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}
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func Initialize(screenWidth, screenHeight, screenScale int) (*ContextUpdater, 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 := &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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// 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, graphics.FilterNearest)
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if err != nil {
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return nil, err
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}
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c.ResetOffscreen()
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c.Clear()
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return &ContextUpdater{c}, nil
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}
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func (u *ContextUpdater) Update(drawer ui.Drawer) error {
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return u.context.update(drawer)
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}
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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 (c *context) 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 *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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func (c *context) update(drawer ui.Drawer) error {
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c.ResetOffscreen()
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c.Clear()
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if err := drawer.Draw(c); err != nil {
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return err
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}
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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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gl.Flush()
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return nil
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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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