/** 
 * @file bumpF.glsl
 *
 * $LicenseInfo:firstyear=2007&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2007, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */
 
#ifdef DEFINE_GL_FRAGCOLOR
out vec4 frag_data[3];
#else
#define frag_data gl_FragData
#endif

uniform float minimum_alpha;
uniform sampler2D diffuseMap;
uniform sampler2D bumpMap;

VARYING vec3 vary_mat0;
VARYING vec3 vary_mat1;
VARYING vec3 vary_mat2;

VARYING vec4 vertex_color;
VARYING vec2 vary_texcoord0;

vec2 encode_normal(vec3 n)
{
	float f = sqrt(8 * n.z + 8);
	return n.xy / f + 0.5;
}

void main() 
{
	vec4 col = texture2D(diffuseMap, vary_texcoord0.xy);
	
	if(col.a < minimum_alpha)
	{
		discard;
    }		
		col *= vertex_color;
		
		vec3 norm = texture2D(bumpMap, vary_texcoord0.xy).rgb * 2.0 - 1.0;

		vec3 tnorm = vec3(dot(norm,vary_mat0),
			  dot(norm,vary_mat1),
			  dot(norm,vary_mat2));
						
		frag_data[0] = vec4(col.rgb, 0.0);
		frag_data[1] = vertex_color.aaaa; // spec
		//frag_data[1] = vec4(vec3(vertex_color.a), vertex_color.a+(1.0-vertex_color.a)*vertex_color.a); // spec - from former class3 - maybe better, but not so well tested
		vec3 nvn = normalize(tnorm);
		frag_data[2] = vec4(encode_normal(nvn), vertex_color.a, 0.0);	
}
