func loadTexture(glctx gl.Context) {
a, err := asset.Open("key.jpeg")
if err != nil {
log.Fatal(err)
}
defer a.Close()
img, _, err := image.Decode(a)
if err != nil {
log.Fatal(err)
}
rect := img.Bounds()
rgba := image.NewRGBA(rect)
draw.Draw(rgba, rect, img, rect.Min, draw.Src)
tex := glctx.CreateTexture()
glctx.ActiveTexture(gl.TEXTURE0)
glctx.BindTexture(gl.TEXTURE_2D, tex)
glctx.TexImage2D(gl.TEXTURE_2D, 0, 859, 610, gl.RGBA, gl.UNSIGNED_BYTE, rgba.Pix)
glctx.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
glctx.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
glctx.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
glctx.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
glctx.ActiveTexture(gl.TEXTURE0)
glctx.BindTexture(gl.TEXTURE_2D, tex)
glctx.TexImage2D(
gl.TEXTURE_2D, 0,
rect.Max.X-rect.Min.X, rect.Max.Y-rect.Min.Y,
gl.RGBA, gl.UNSIGNED_BYTE, rgba.Pix)
}
