/*
===========================================================================
Copyright (C) 2006-2009 Robert Beckebans <trebor_7@users.sourceforge.net>

This file is part of XreaL source code.

XreaL source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.

XreaL source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with XreaL source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

/* generic_fp.glsl */

uniform sampler2D	u_Texture0Map;
uniform sampler2D	u_Texture1Map;
uniform int			u_AlphaTest;
uniform int			u_Texture1Env;

varying vec3		var_Position;
varying vec2		var_Tex1;
varying vec2		var_Tex2;
varying vec4		var_Color;
varying float   var_Discard;

void	main()
{
	if(var_Discard > 0.0)
	{
    discard;
    return;
	}
	
	vec4 color =  texture2D(u_Texture0Map, var_Tex1);
  vec4 color2 = texture2D(u_Texture1Map, var_Tex2);
  
	if (u_Texture1Env == 1) // GL_MODULATE
	{
    color *= color2;
  }
	else if (u_Texture1Env == 2) // GL_REPLACE
	{
    color = color2;
  }
	else if (u_Texture1Env == 3) // GL_DECAL
	{
    color = color * vec4(1.0 - color2.a) + color2 * vec4(color2.a);
  }
	else if (u_Texture1Env == 4) // GL_ADD
	{
    color += color2;
  }

	color *= var_Color;
	gl_FragColor = color;
}