Shader code

//texture.vsh

attribute vec4 a_position;
attribute vec2 a_texCoord;
varying vec2 v_texCoord;

void main(void){
    gl_Position = a_position;
    v_texCoord = a_texCoord;
}

//texture.fsh
precision mediump float;
varying vec2 v_texCoord;
uniform sampler2D s_texture;

void main(void){
    gl_FragColor = texture2D(s_texture, v_texCoord);
}