feat(clusterApp): initial version run in Ubuntu.

change fb to DRM

clusterApp/Res/shader/prog_font.fp

@@ -0,0 +1,12 @@
+precision mediump float;
+
+uniform sampler2D u_sam_tex;
+uniform vec3 u_v3_clr;
+uniform float u_flt_inv_alpha;
+varying vec2 v_v2_txc;
+#define offset (1.0/512)
+void main()
+{
+	float alpha = texture2D(u_sam_tex, v_v2_txc).a;
+	gl_FragColor = vec4(u_v3_clr.r, u_v3_clr.g, u_v3_clr.b, (1.0-u_flt_inv_alpha)*alpha);
+}