GL3D test


    attribute vec4 a_Position;
    attribute vec4 a_Color;
    varying vec4 v_Color;
    uniform mat4 u_ProjMatrix;

    void main() {
        gl_Position = u_ProjMatrix * a_Position;
        v_Color = a_Color;
    }


    #ifdef GL_ES
    precision mediump float;
    #endif

    varying vec4 v_Color;

    void main() {
        gl_FragColor = v_Color;
    }