Added textures to backend

texture.go

@@ -0,0 +1,43 @@
+package x
+
+import "image"
+import "git.tebibyte.media/tomo/tomo"
+
+type texture struct {
+	pix    []uint8
+	stride int
+	rect   image.Rectangle
+}
+
+func (backend *Backend) NewTexture (source image.Image) tomo.Texture {
+	bounds := source.Bounds()
+	texture := &texture {
+		pix:    make([]uint8, bounds.Dx() * bounds.Dy() * 4),
+		stride: bounds.Dx(),
+		rect:   bounds.Sub(bounds.Min),
+	}
+
+	index := 0
+	var point image.Point
+	for point.Y = bounds.Min.Y; point.Y < bounds.Max.Y; point.Y ++ {
+	for point.X = bounds.Min.X; point.X < bounds.Max.X; point.X ++ {
+		r, g, b, a := source.At(point.X, point.Y).RGBA()
+		texture.pix[index + 0] = uint8(b >> 8)
+		texture.pix[index + 1] = uint8(g >> 8)
+		texture.pix[index + 2] = uint8(r >> 8)
+		texture.pix[index + 3] = uint8(a >> 8)
+		index += 4
+	}}
+	
+	return texture
+}
+
+func (this *texture) Clip (bounds image.Rectangle) tomo.Texture {
+	clipped := *this
+	clipped.rect = bounds
+	return &clipped
+}
+
+func (this *texture) Close () error {
+	return nil
+}