examples: add loading-images example

Signed-off-by: Lilis Iskandar <lilis@veand.co>

examples/loading-images/loading-images.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"os"
+
+	"github.com/veandco/go-sdl2/img"
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+const (
+	bmpImagePath = "../../assets/test.bmp"
+	pngImagePath = "../../assets/test.png"
+)
+
+func run() (err error) {
+	var window *sdl.Window
+	var surface *sdl.Surface
+	var bmpImage *sdl.Surface
+	var pngImage *sdl.Surface
+
+	if err = sdl.Init(sdl.INIT_VIDEO); err != nil {
+		return
+	}
+	defer sdl.Quit()
+
+	// Create a window for us to draw the images on
+	if window, err = sdl.CreateWindow("Loading images", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, 800, 600, sdl.WINDOW_SHOWN); err != nil {
+		return
+	}
+	defer window.Destroy()
+
+	if surface, err = window.GetSurface(); err != nil {
+		return
+	}
+
+	// Load a BMP image
+	if bmpImage, err = sdl.LoadBMP(bmpImagePath); err != nil {
+		return err
+	}
+	defer bmpImage.Free()
+
+	// Load a PNG image
+	if pngImage, err = img.Load(pngImagePath); err != nil {
+		return err
+	}
+	defer pngImage.Free()
+
+	// Draw the BMP image on the first half of the window
+	bmpImage.BlitScaled(nil, surface, &sdl.Rect{X: 0, Y: 0, W: 400, H: 400})
+
+	// Draw the BMP image on the first half of the window
+	pngImage.BlitScaled(nil, surface, &sdl.Rect{X: 400, Y: 0, W: 400, H: 400})
+
+	// Update the window surface with what we have drawn
+	window.UpdateSurface()
+
+	// Run infinite loop until user closes the window
+	running := true
+	for running {
+		for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
+			switch event.(type) {
+			case *sdl.QuitEvent:
+				running = false
+			}
+		}
+
+		sdl.Delay(16)
+	}
+
+	return
+}
+
+func main() {
+	if err := run(); err != nil {
+		os.Exit(1)
+	}
+}