progress on adding base layer

old/android/assets/shaders/basic.vsh

@@ -0,0 +1,14 @@
+attribute vec4 a_position;
+attribute vec4 a_color;
+attribute vec2 a_texCoord0;
+
+uniform mat4 u_projTrans;
+
+varying vec4 vColor;
+varying vec2 vTexCoord;
+
+void main() {
+	vColor = a_color;
+	vTexCoord = a_texCoord0;
+	gl_Position = u_projTrans * a_position;
+}