Move all engine stuff to GoRetro. Still many interactions between game and engine code that there should not be.

utils_texture.go

@@ -0,0 +1,53 @@
+package GoRetro
+
+import (
+	"fmt"
+
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+var TexList map[string]*sdl.Texture
+
+func drawTexture(
+	tex *sdl.Texture,
+	position Vector,
+	rotation float64,
+	renderer *sdl.Renderer) error {
+
+	_, _, width, height, err := tex.Query()
+	if err != nil {
+		return fmt.Errorf("querying texture: %v", err)
+	}
+
+	// Convert coordinates to the top left of the sprite
+	position.X -= float64(width) / 2.0
+	position.Y -= float64(height) / 2.0
+
+	return renderer.CopyEx(
+		tex,
+		&sdl.Rect{X: 0, Y: 0, W: width, H: height},
+		&sdl.Rect{X: int32(position.X), Y: int32(position.Y), W: width, H: height},
+		rotation,
+		&sdl.Point{X: width / 2, Y: height / 2},
+		sdl.FLIP_NONE)
+}
+
+func loadTextureFromBMP(filename string, renderer *sdl.Renderer) (*sdl.Texture, error) {
+	if val, ok := TexList[filename]; ok {
+		return val, nil
+	}
+
+	img, err := sdl.LoadBMP(filename)
+	if err != nil {
+		return nil, fmt.Errorf("loading %v: %v", filename, err)
+	}
+	defer img.Free()
+	tex, err := renderer.CreateTextureFromSurface(img)
+	if err != nil {
+		return nil, fmt.Errorf("creating texture from %v: %v", filename, err)
+	}
+
+	TexList[filename] = tex
+	fmt.Printf("Caching %s\n", filename)
+	return tex, nil
+}