default shader programs for libGDX

frag.glsl

#ifdef GL_ES
    precision mediump float;
#endif

varying vec4 v_color;
varying vec2 v_texCoords;
uniform sampler2D u_texture;
uniform mat4 u_projTrans;

void main() {
    gl_FragColor = v_color * texture2D(u_texture, v_texCoords);
}

vert.glsl

attribute vec4 a_position;
attribute vec4 a_color;
attribute vec2 a_texCoord;

uniform mat4 u_projTrans;

varying vec4 v_color;
varying vec2 v_texCoord;

void main() {
    v_color = a_color;
    v_texCoord = a_texCoord + 0;
    gl_Position = u_projTrans * a_position;
}