56 lines
1.2 KiB
Go
56 lines
1.2 KiB
Go
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package sdl
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import (
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"fmt"
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"git.kirsle.net/apps/doodle/lib/render"
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"github.com/veandco/go-sdl2/sdl"
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)
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// Copy a texture into the renderer.
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func (r *Renderer) Copy(t render.Texturer, src, dst render.Rect) {
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if tex, ok := t.(*Texture); ok {
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var (
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a = RectToSDL(src)
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b = RectToSDL(dst)
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)
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r.renderer.Copy(tex.tex, &a, &b)
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}
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}
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// Texture can hold on to SDL textures for caching and optimization.
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type Texture struct {
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tex *sdl.Texture
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width int32
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height int32
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}
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// Size returns the dimensions of the texture.
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func (t *Texture) Size() render.Rect {
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return render.NewRect(t.width, t.height)
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}
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// NewBitmap initializes a texture from a bitmap image.
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func (r *Renderer) NewBitmap(filename string) (render.Texturer, error) {
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surface, err := sdl.LoadBMP(filename)
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if err != nil {
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return nil, fmt.Errorf("NewBitmap: LoadBMP: %s", err)
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}
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defer surface.Free()
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// TODO: chroma key color hardcoded to white here
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key := sdl.MapRGB(surface.Format, 255, 255, 255)
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surface.SetColorKey(true, key)
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tex, err := r.renderer.CreateTextureFromSurface(surface)
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if err != nil {
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return nil, fmt.Errorf("NewBitmap: create texture: %s", err)
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}
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return &Texture{
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width: surface.W,
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height: surface.H,
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tex: tex,
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}, nil
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}
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