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# Simplest Shader Program

    import sys

    from vispy import gloo
    from vispy import app
    import numpy as np

    VERT_SHADER = """
    attribute vec2 a_position;
    uniform float u_size;

    void main() {
        gl_Position = vec4(a_position, 0.0, 1.0);
        gl_PointSize = u_size;
    }
    """

    FRAG_SHADER = """
    void main() {
        gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
    }
    """

    class Canvas(app.Canvas):
        def __init__(self):
            app.Canvas.__init__(self, keys='interactive')

            ps = self.pixel_scale

            self.program = gloo.Program(VERT_SHADER, FRAG_SHADER)
            data = np.random.uniform(-0.5, 0.5, size=(20, 2))
            self.program['a_position'] = data.astype(np.float32)
            self.program['u_size'] = 20.*ps

            self.show()

        def on_resize(self, event):
            width, height = event.size
            gloo.set_viewport(0, 0, width, height)

        def on_draw(self, event):
            gloo.clear('white')
            self.program.draw('points')

    if __name__ == '__main__':
        canvas = Canvas()
        if sys.flags.interactive != 1:
            app.run()

Total running time of the script: (0 minutes 0.449 seconds)

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