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/**
* @file previewV.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
* $/LicenseInfo$
*/
uniform mat3 normal_matrix;
uniform mat4 texture_matrix0;
uniform mat4 modelview_matrix;
uniform mat4 modelview_projection_matrix;
ATTRIBUTE vec3 position;
ATTRIBUTE vec3 normal;
ATTRIBUTE vec2 texcoord0;
uniform vec4 color;
VARYING vec4 vertex_color;
VARYING vec2 vary_texcoord0;
uniform vec4 light_position[8];
uniform vec3 light_direction[8];
uniform vec3 light_attenuation[8];
uniform vec3 light_diffuse[8];
//===================================================================================================
//declare these here explicitly to separate them from atmospheric lighting elsewhere to work around
//drivers that are picky about functions being declared but not defined even if they aren't called
float calcDirectionalLight(vec3 n, vec3 l)
{
float a = max(dot(n,l),0.0);
return a;
}
float calcPointLightOrSpotLight(vec3 v, vec3 n, vec4 lp, vec3 ln, float la, float is_pointlight)
{
//get light vector
vec3 lv = lp.xyz-v;
//get distance
float d = length(lv);
//normalize light vector
lv *= 1.0/d;
//distance attenuation
float da = clamp(1.0/(la * d), 0.0, 1.0);
// spotlight coefficient.
float spot = max(dot(-ln, lv), is_pointlight);
da *= spot*spot; // GL_SPOT_EXPONENT=2
//angular attenuation
da *= calcDirectionalLight(n, lv);
return da;
}
//====================================================================================================
void main()
{
//transform vertex
vec4 pos = (modelview_matrix * vec4(position.xyz, 1.0));
gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0);
vary_texcoord0 = (texture_matrix0 * vec4(texcoord0,0,1)).xy;
vec3 norm = normalize(normal_matrix * normal);
vec4 col = vec4(0,0,0,1);
// Collect normal lights (need to be divided by two, as we later multiply by 2)
col.rgb += light_diffuse[1].rgb * calcDirectionalLight(norm, light_position[1].xyz);
col.rgb += light_diffuse[2].rgb * calcDirectionalLight(norm, light_position[2].xyz);
col.rgb += light_diffuse[3].rgb * calcDirectionalLight(norm, light_position[3].xyz);
col /= 2.0;
vertex_color = col*color;
}
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