add more textures examples

examples/textures/background_scrolling/main.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+var (
+	screenW = int32(1280)
+	screenH = int32(500)
+)
+
+func main() {
+
+	rl.InitWindow(screenW, screenH, "raylib [textures] example - background scrolling")
+
+	background := rl.LoadTexture("cyberpunk_street_background.png")
+	midground := rl.LoadTexture("cyberpunk_street_midground.png")
+	foreground := rl.LoadTexture("cyberpunk_street_foreground.png")
+
+	scrollBack := float32(0)
+	scrollMid := float32(0)
+	scrollFore := float32(0)
+
+	rl.SetTargetFPS(60)
+
+	for !rl.WindowShouldClose() {
+
+		scrollBack -= 0.1
+		scrollMid -= 0.5
+		scrollFore -= 1
+
+		if scrollBack <= -float32(background.Width)*2 {
+			scrollBack = 0
+		}
+
+		if scrollMid <= -float32(midground.Width)*2 {
+			scrollMid = 0
+		}
+
+		if scrollFore <= -float32(foreground.Width)*2 {
+			scrollFore = 0
+		}
+
+		rl.BeginDrawing()
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.DrawTextureEx(background, rl.NewVector2(scrollBack, 20), 0, 2, rl.White)
+		rl.DrawTextureEx(background, rl.NewVector2(float32(background.Width*2)+scrollBack, 20), 0, 2, rl.White)
+
+		rl.DrawTextureEx(midground, rl.NewVector2(scrollMid, 20), 0, 2, rl.White)
+		rl.DrawTextureEx(midground, rl.NewVector2(float32(midground.Width*2)+scrollMid, 20), 0, 2, rl.White)
+
+		rl.DrawTextureEx(foreground, rl.NewVector2(scrollFore, 20), 0, 2, rl.White)
+		rl.DrawTextureEx(foreground, rl.NewVector2(float32(foreground.Width*2)+scrollFore, 20), 0, 2, rl.White)
+
+		txt := "BACKGROUND SCROLLING & PARALLAX"
+		txtlen := rl.MeasureText(txt, 20)
+		rl.DrawText(txt, (screenW/2)-txtlen/2, screenH-50, 20, rl.Black)
+		txt = "(c) Cyberpunk Street Environment by Luis Zuno (@ansimuz)"
+		txtlen = rl.MeasureText(txt, 10)
+		rl.DrawText(txt, (screenW/2)-txtlen/2, screenH-25, 10, rl.Black)
+
+		rl.EndDrawing()
+	}
+
+	rl.CloseWindow()
+}