// Example Fragment Shader

varying texture_uv; // comes from vertex shader
uniform sampler2D texture;
uniform vec2 offset;

void main() {

    // fast:
    gl_FragColor = texture2D( texture, texture_uv.xy ); //xy used
    // goodbye performance:
    //gl_FragColor = texture2D( texture, texture_uv.xy + offset );
    //gl_FragColor = texture2D( texture, texture_uv.xy + texture2D( another_texture, uv ) );

}