stellarium/data/shaders/planet.vert at f7cd0ba76cba9fd2d9f2bebe02f5c78d53d9d694 · Stellarium/stellarium · GitHub

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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;
#ifndef PROJECTOR_PRESENT
ATTRIBUTE highp vec4 unprojectedVertex; //original vertex coordinate (in km for OBJ models, in AU otherwise)
#endif
#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

#ifdef PROJECTOR_PRESENT
uniform float sphereScale;
#endif

void main()
{
#ifdef PROJECTOR_PRESENT
	highp vec4 unprojectedVertex = vertex;
	gl_Position = projectionMatrix*vec4(project(sphereScale*vertex.xyz), 1);
#else
    gl_Position = projectionMatrix * vertex;
#endif
    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
}