Add WorldRgbaSpriteRenderer.

glsl/rgba.vert

@@ -1,8 +1,9 @@
-uniform vec2 r1;
-uniform vec2 r2;		// matrix elements
+uniform vec2 Scroll;
+uniform vec2 r1, r2;
+
 void main()
 {
-	vec2 p = gl_Vertex.xy*r1 + r2;
+	vec2 p = (gl_Vertex.xy - Scroll.xy)*r1 + r2;
 	gl_Position = vec4(p.x,p.y,0,1);
 	gl_TexCoord[0]  = gl_MultiTexCoord0;
 }