added genChecker

h3d/mat/Texture.hx

@@ -366,6 +366,26 @@ class Texture {
 		return t;
 	}
 
+	/**
+		Returns a checker texture of size x size, than can be repeated
+	**/
+	public static function genChecker(size) {
+		var engine = h3d.Engine.getCurrent();
+		var k = checkerTextureKeys.get(size);
+		var t : Texture = k == null ? null : @:privateAccess engine.resCache.get(k);
+		if( t != null && !t.isDisposed() )
+			return t;
+		if( k == null ) {
+			k = {};
+			checkerTextureKeys.set(size, k);
+		}
+		var t = new h3d.mat.Texture(size, size, [NoAlloc]);
+		t.realloc = allocChecker.bind(t,size);
+		@:privateAccess engine.resCache.set(k, t);
+		return t;
+	}
+
+	static var checkerTextureKeys = new Map<Int,{}>();
 	static var noiseTextureKeys = new Map<Int,{}>();
 
 	public static function genNoise(size) {
@@ -395,4 +415,16 @@ class Texture {
 		b.dispose();
 	}
 
+	static function allocChecker( t : h3d.mat.Texture, size : Int ) {
+		var b = new hxd.BitmapData(size, size);
+		b.clear(0xFFFFFFFF);
+		for( x in 0...size>>1 )
+			for( y in 0...size>>1 ) {
+				b.setPixel(x, y, 0xFF000000);
+				b.setPixel(x+(size>>1), y+(size>>1), 0xFF000000);
+			}
+		t.uploadBitmap(b);
+		b.dispose();
+	}
+
 }