ParallelRDP integration

external/shader.vert

@@ -0,0 +1,8 @@
+#version 450
+layout(location = 0) in vec2 Position;
+layout(location = 0) out highp vec2 vUV;
+
+void main() {
+  gl_Position = vec4(Position, 0.0, 1.0);
+  vUV = 0.5 * Position + 0.5;
+}