#pragma optimize (on)
#pragma debug (off)

uniform sampler2D color_texture;
uniform sampler2D colortable_texture;
uniform vec2      colortable_sz;         // orig size for full bgr
uniform vec2      colortable_pow2_sz;    // orig size for full bgr

void main()
{
    vec4 color_tex;
    vec2 color_map_coord;
    float color_map_pos;
    float colortable_scale = (colortable_sz.x*colortable_sz.y/3.0);

    // normalized texture coordinates ..
    color_tex = texture2D(color_texture, gl_TexCoord[0].st) * ((colortable_sz.x*colortable_sz.y/3.0)-1.0);// lookup space

    color_map_pos     = color_tex.b;
    color_map_coord.y = floor(color_map_pos/colortable_sz.x);
    color_map_coord.x = mod(color_map_pos,colortable_sz.x);
    gl_FragColor.b    = texture2D(colortable_texture, color_map_coord/colortable_pow2_sz).b;

    color_map_pos     = color_tex.g + colortable_scale;
    color_map_coord.y = floor(color_map_pos/colortable_sz.x);
    color_map_coord.x = mod(color_map_pos,colortable_sz.x);
    gl_FragColor.g    = texture2D(colortable_texture, color_map_coord/colortable_pow2_sz).g;

    color_map_pos     = color_tex.r + 2.0 * colortable_scale;
    color_map_coord.y = floor(color_map_pos/colortable_sz.x);
    color_map_coord.x = mod(color_map_pos,colortable_sz.x);
    gl_FragColor.r    = texture2D(colortable_texture, color_map_coord/colortable_pow2_sz).r;
}