doodle/lib/render/sdl/texture.go
Noah Petherbridge 2b42a072a0 Code Layout Refactor
* All private Doodle source code into the pkg/ folder.
* Potentially public code into the lib/ folder.
* Centralize the logger into a subpackage.
2019-04-09 17:35:44 -07:00

56 lines
1.2 KiB
Go

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