#include "vtkPointGaussianGS.h"

const char *vtkPointGaussianGS =
"//VTK::System::Dec\n"
"\n"
"/*=========================================================================\n"
"\n"
"  Program:   Visualization Toolkit\n"
"  Module:    vtkPointGaussianGS.glsl\n"
"\n"
"  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen\n"
"  All rights reserved.\n"
"  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.\n"
"\n"
"     This software is distributed WITHOUT ANY WARRANTY; without even\n"
"     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR\n"
"     PURPOSE.  See the above copyright notice for more information.\n"
"\n"
"=========================================================================*/\n"
"// Template for the polydata mappers geometry shader\n"
"\n"
"// primitiveID\n"
"//VTK::PrimID::Dec\n"
"\n"
"// optional color passed in from the vertex shader, vertexColor\n"
"//VTK::Color::Dec\n"
"\n"
"layout(points) in;\n"
"layout(triangle_strip, max_vertices = 3) out;\n"
"\n"
"uniform int cameraParallel;\n"
"uniform float triangleScale;\n"
"\n"
"uniform mat4 VCDCMatrix;\n"
"\n"
"in float radiusVCVSOutput[];\n"
"out vec2 offsetVCGSOutput;\n"
"\n"
"// clipping plane vars\n"
"//VTK::Clip::Dec\n"
"\n"
"// picking support\n"
"//VTK::Picking::Dec\n"
"\n"
"void main()\n"
"{\n"
"  // the offsets sent down are positioned\n"
"  // as radius*triangleScale from the center of the\n"
"  // gaussian.  This has to be consistent\n"
"  // with the offsets we build into the VBO\n"
"  float radius = radiusVCVSOutput[0]/triangleScale;\n"
"\n"
"  int i = 0;\n"
"  vec4 offset;\n"
"\n"
"  vec4 base1 = vec4(1.0,0.0,0.0,0.0);\n"
"  vec4 base2 = vec4(0.0,1.0,0.0,0.0);\n"
"\n"
"  // make the triangle face the camera\n"
"  if (cameraParallel == 0)\n"
"  {\n"
"    vec3 dir = normalize(-gl_in[0].gl_Position.xyz);\n"
"    base2 = vec4(normalize(cross(dir,vec3(1.0,0.0,0.0))), 0.0);\n"
"    base1 = vec4(cross(base2.xyz,dir),0.0);\n"
"  }\n"
"\n"
"  //VTK::PrimID::Impl\n"
"\n"
"  //VTK::Clip::Impl\n"
"\n"
"  //VTK::Color::Impl\n"
"\n"
"  // note 1.73205 = 2.0*cos(30)\n"
"\n"
"  offset = vec4(-1.73205*radiusVCVSOutput[0], -radiusVCVSOutput[0], 0.0, 0.0);\n"
"\n"
"  //VTK::Picking::Impl\n"
"\n"
"  offsetVCGSOutput = offset.xy/radius;\n"
"  gl_Position = VCDCMatrix * (gl_in[0].gl_Position + offset.x*base1 + offset.y*base2);\n"
"  EmitVertex();\n"
"\n"
"  offset = vec4(1.73205*radiusVCVSOutput[0], -radiusVCVSOutput[0], 0.0, 0.0);\n"
"  offsetVCGSOutput = offset.xy/radius;\n"
"  gl_Position = VCDCMatrix * (gl_in[0].gl_Position + offset.x*base1 + offset.y*base2);\n"
"  EmitVertex();\n"
"\n"
"  offset = vec4(0.0, 2.0*radiusVCVSOutput[0], 0.0, 0.0);\n"
"  offsetVCGSOutput = offset.xy/radius;\n"
"  gl_Position = VCDCMatrix * (gl_in[0].gl_Position + offset.x*base1 + offset.y*base2);\n"
"  EmitVertex();\n"
"\n"
"  EndPrimitive();\n"
"}\n"
"";