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/*
* Stellarium
* Copyright (C) 2002-2016 Fabien Chereau and Stellarium contributors
*
* 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 2
* 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., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*/
/*
This is the vertex shader for solar system object rendering
*/
ATTRIBUTE highp vec4 vertex; // vertex projected by CPU
ATTRIBUTE mediump vec2 texCoord;
ATTRIBUTE highp vec4 unprojectedVertex; //original vertex coordinate (in km for OBJ models, in AU otherwise)
#ifdef IS_OBJ
ATTRIBUTE mediump vec3 normalIn; // OBJs have pre-calculated normals
#endif
uniform highp mat4 projectionMatrix;
#ifdef SHADOWMAP
uniform highp mat4 shadowMatrix;
VARYING highp vec4 shadowCoord;
#endif
VARYING mediump vec2 texc; //texture coord
VARYING highp vec3 P; //original unprojected position (in AU)
#ifdef IS_MOON
//Luna uses normal mapping
VARYING highp vec3 normalX;
VARYING highp vec3 normalY;
VARYING highp vec3 normalZ;
#else
VARYING mediump vec3 normalVS;
//normal objects use gouraud shading
//good enough for our spheres
uniform highp vec3 lightDirection;
#endif
void main()
{
gl_Position = projectionMatrix * vertex;
texc = texCoord;
#ifdef SHADOWMAP
shadowCoord = shadowMatrix * unprojectedVertex; //uses the km data for better accuracy
#endif
#ifdef IS_OBJ
//OBJ uses imported normals
//assume it is pre-normalized by the importer
normalVS = normalIn;
//The unprojectedVertex here is in km, so we have to scale to AU
P = unprojectedVertex.xyz / 149597870.691;
#else
//unprojectedVertex is already in AU
P = unprojectedVertex.xyz;
//other objects use the spherical normals
highp vec3 normal = normalize(unprojectedVertex.xyz);
#ifdef IS_MOON
if (abs(normal.z)==1.0) // avoid invalid pole anomaly
{
normalX=vec3(0);
normalY=vec3(0);
}
else
{
normalX = normalize(cross(vec3(0,0,1), normal));
normalY = normalize(cross(normal, normalX));
}
normalZ = normal;
#else
normalVS = normal;
#endif
#endif
}
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