99 lines
3.1 KiB
GLSL
99 lines
3.1 KiB
GLSL
/**
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* @file previewV.glsl
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*
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* $LicenseInfo:firstyear=2007&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2007, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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uniform mat3 normal_matrix;
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uniform mat4 texture_matrix0;
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uniform mat4 modelview_matrix;
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uniform mat4 modelview_projection_matrix;
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ATTRIBUTE vec3 position;
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ATTRIBUTE vec3 normal;
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ATTRIBUTE vec2 texcoord0;
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uniform vec4 color;
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VARYING vec4 vertex_color;
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VARYING vec2 vary_texcoord0;
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uniform vec4 light_position[8];
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uniform vec3 light_direction[8];
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uniform vec3 light_attenuation[8];
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uniform vec3 light_diffuse[8];
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//===================================================================================================
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//declare these here explicitly to separate them from atmospheric lighting elsewhere to work around
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//drivers that are picky about functions being declared but not defined even if they aren't called
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float calcDirectionalLight(vec3 n, vec3 l)
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{
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float a = max(dot(n,l),0.0);
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return a;
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}
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float calcPointLightOrSpotLight(vec3 v, vec3 n, vec4 lp, vec3 ln, float la, float is_pointlight)
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{
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//get light vector
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vec3 lv = lp.xyz-v;
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//get distance
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float d = length(lv);
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//normalize light vector
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lv *= 1.0/d;
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//distance attenuation
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float da = clamp(1.0/(la * d), 0.0, 1.0);
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// spotlight coefficient.
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float spot = max(dot(-ln, lv), is_pointlight);
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da *= spot*spot; // GL_SPOT_EXPONENT=2
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//angular attenuation
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da *= calcDirectionalLight(n, lv);
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return da;
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}
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//====================================================================================================
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void main()
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{
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//transform vertex
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vec4 pos = (modelview_matrix * vec4(position.xyz, 1.0));
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gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0);
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vary_texcoord0 = (texture_matrix0 * vec4(texcoord0,0,1)).xy;
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vec3 norm = normalize(normal_matrix * normal);
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vec4 col = vec4(0,0,0,1);
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// Collect normal lights (need to be divided by two, as we later multiply by 2)
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col.rgb += light_diffuse[1].rgb * calcDirectionalLight(norm, light_position[1].xyz);
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col.rgb += light_diffuse[2].rgb*calcPointLightOrSpotLight(pos.xyz, norm, light_position[2], light_direction[2], light_attenuation[2].x, light_attenuation[2].z);
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col.rgb += light_diffuse[3].rgb*calcPointLightOrSpotLight(pos.xyz, norm, light_position[3], light_direction[3], light_attenuation[3].x, light_attenuation[3].z);
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vertex_color = col*color;
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}
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