Perform image format conversion for VAAPI on the gpu

assets/shaders/opengl/ConvertUV.vert

@@ -0,0 +1,27 @@
+#version 300 es
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform float width_i;
+
+out vec3 uuv;
+//--------------------------------------------------------------------------------------
+// Vertex Shader
+//--------------------------------------------------------------------------------------
+void main()
+{
+	float idHigh = float(gl_VertexID >> 1);
+	float idLow = float(gl_VertexID & int(1));
+
+	float x = idHigh * 4.0 - 1.0;
+	float y = idLow * 4.0 - 1.0;
+
+	float u_right = idHigh * 2.0;
+	float u_left = u_right - width_i;
+	float v = idLow * 2.0;
+
+	uuv = vec3(u_left, u_right, v);
+	gl_Position = vec4(x, y, 0.0, 1.0);
+}