62 lines
1.3 KiB
Go
62 lines
1.3 KiB
Go
package ui
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import "opslag.de/schobers/geom"
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type RenderBufferFn func(ctx Context, size geom.PointF32)
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type Buffer struct {
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texture Texture
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size geom.PointF32
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}
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func (b *Buffer) Update(ctx Context, size geom.PointF32) error {
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if b.texture != nil {
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if size == b.size {
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return nil
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}
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b.texture.Destroy()
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b.texture = nil
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b.size = geom.ZeroPtF32
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}
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texture, err := ctx.Renderer().CreateTextureTarget(size.X, size.Y)
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if err != nil {
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return err
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}
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b.texture = texture
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b.size = size
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return nil
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}
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func (b *Buffer) Render(ctx Context, pos geom.PointF32, fn RenderBufferFn) {
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if b.texture == nil {
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return
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}
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renderer := ctx.Renderer()
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currTarget := renderer.Target()
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renderer.RenderTo(b.texture)
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fn(ctx, b.size)
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renderer.RenderTo(currTarget)
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renderer.DrawTexturePoint(b.texture, pos)
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}
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type BufferControl struct {
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ControlBase
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buffer Buffer
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}
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func (c *BufferControl) Arrange(ctx Context, bounds geom.RectangleF32, offset geom.PointF32, parent Control) {
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c.ControlBase.Arrange(ctx, bounds, offset, parent)
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c.buffer.Update(ctx, bounds.Size())
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}
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func (c *BufferControl) Render(ctx Context) {
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c.RenderFn(ctx, c.RenderBuffer)
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}
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func (c *BufferControl) RenderFn(ctx Context, render RenderBufferFn) {
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c.buffer.Render(ctx, c.bounds.Min, render)
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}
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func (c *BufferControl) RenderBuffer(ctx Context, size geom.PointF32) {}
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