bloomprep.shader

void main() 
{
    //Use the first set of texture coordinates in the fragment shader 
    gl_TexCoord[0] = gl_MultiTexCoord0;

    // Transform the position to screen space
    gl_Position = ftransform(); 
}

~~~~~~~

uniform sampler2D Texture0;

uniform float threshold;

void main() 
{
    vec4 b = texture2D( Texture0, gl_TexCoord[0].xy );

    // Cut off?
    gl_FragColor = max( b - threshold, 0.0 ) * ( 1.0 / threshold );
}

---