data/shaders/function.vert

attribute vec3 position;

uniform mat4 ModelViewProjectionMatrix;

// Removing this varying causes an inexplicable performance regression
// with r600g... Keeping it for now.
varying vec4 dummy;

float process(float d)
{
    $PROCESS$
    return d;
}

void main(void)
{
    dummy = vec4(1.0);

    float d = fract(position.x);

    $MAIN$

    vec4 pos = vec4(position.x,
                    position.y + 0.1 * d * fract(position.x),
                    position.z, 1.0);

    // Transform the position to clip coordinates
    gl_Position = ModelViewProjectionMatrix * pos;
}