fastsingle.glsl

// vertex shader
attribute vec4 a_color;
attribute vec4 a_position;
attribute vec2 a_tex_coord;
varying highp vec2 v_tex_coord;
varying lowp vec4 v_color_mix;
void main() {
  v_color_mix = a_color;
  v_tex_coord = a_tex_coord;
  gl_Position = a_position;
}

// fragment shader
uniform lowp sampler2D u_texture;
varying highp vec2 v_tex_coord;
varying lowp vec4 v_color_mix;
void main() {
  gl_FragColor = v_color_mix * texture2D(u_texture, v_tex_coord);
}