minor progress on background shader

android/assets/shaders/star_vert.glsl

@@ -4,17 +4,14 @@ attribute vec2 a_texCoord0;
 
 uniform mat4 u_projTrans;
 uniform float time;
-uniform vec2 resolution;
 
 varying vec4 vColor;
 varying vec2 vTexCoord;
 varying float vTime;
-varying vec2 vResolution;
 void main() {
 	vColor = a_color;
 	vTexCoord = a_texCoord0;
 	vTime = time;
-	vResolution = resolution;
 
 	gl_Position = u_projTrans * a_position;
 }