stk-code_catmod/data/shaders/splatting.frag

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// SuperTuxKart - a fun racing game with go-kart
// Copyright (C) 2013 the SuperTuxKart team
//
// This program 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 3
// of the License, or (at your option) any later version.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
uniform sampler2D tex_layout;
uniform sampler2D tex_detail0;
uniform sampler2D tex_detail1;
uniform sampler2D tex_detail2;
uniform sampler2D tex_detail3;
uniform sampler2D tex_detail4;
varying vec3 normal;
varying vec3 lightdir2;
varying vec4 vertex_color;
void main()
{
vec4 splatting = texture2D(tex_layout, gl_TexCoord[1].st);
vec4 detail0 = texture2D(tex_detail0, gl_TexCoord[0].st);
vec4 detail1 = texture2D(tex_detail1, gl_TexCoord[0].st);
vec4 detail2 = texture2D(tex_detail2, gl_TexCoord[0].st);
vec4 detail3 = texture2D(tex_detail3, gl_TexCoord[0].st);
vec4 detail4 = texture2D(tex_detail4, gl_TexCoord[0].st);
gl_FragColor = (splatting.r * detail0 +
splatting.g * detail1 +
splatting.b * detail2 +
(1.0 - splatting.r - splatting.g - splatting.b) * detail3 +
(1.0 - splatting.a) * detail4)
* min(1.0, 0.2 + dot(lightdir2, normal)) * vertex_color; // 0.2 is the ambient light.
}