types.cpp

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// Copyright (c) 2010-2022, Lawrence Livermore National Security, LLC. Produced
// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
// LICENSE and NOTICE for details. LLNL-CODE-443271.
//
// This file is part of the GLVis visualization tool and library. For more
// information and source code availability see https://glvis.org.
//
// GLVis is free software; you can redistribute it and/or modify it under the
// terms of the BSD-3 license. We welcome feedback and contributions, see file
// CONTRIBUTING.md for details.

#include "types.hpp"
#include <iostream>
#include <cstddef>

using namespace gl3;


void GlDrawable::addCone(float x, float y, float z,
                         float vx, float vy, float vz,
                         float cone_scale)
{
   double rhos  = sqrt (vx*vx+vy*vy+vz*vz);
   float phi   = acos(vz/rhos);
   float theta = atan2 (vy, vx);

   glm::mat4 mtx(1.0);
   mtx = glm::translate(mtx, glm::vec3(x, y, z));
   mtx = glm::rotate(mtx, theta, glm::vec3(0.f, 0.f, 1.f));
   mtx = glm::rotate(mtx, phi, glm::vec3(0.f, 1.f, 0.f));
   mtx = glm::scale(mtx, glm::vec3(cone_scale/4.));
   mtx = glm::translate(mtx, glm::vec3(0, 0, 4));
   glm::mat3 norm(mtx);
   norm = glm::inverseTranspose(norm);

   glm::vec3 start_vtx = glm::vec3(mtx * glm::vec4(0.f, 0.f, 0.f, 1.f));
   glm::vec3 start_norm = glm::vec3(norm * glm::vec3(0.f, 0.f, 1.f));

   glm::vec3 base_pts[] =
   {
      glm::vec3(mtx * glm::vec4(1, 0, -4, 1)),
      glm::vec3(mtx * glm::vec4(cos(2*M_PI/4), sin(2*M_PI/4), -4, 1)),
      glm::vec3(mtx * glm::vec4(cos(4*M_PI/4), sin(4*M_PI/4), -4, 1)),
      glm::vec3(mtx * glm::vec4(cos(6*M_PI/4), sin(6*M_PI/4), -4, 1)),
   };

   float nz = (1.0/4.0);
   glm::vec3 base_norms[] =
   {
      glm::vec3(norm * glm::vec3(1, 0, nz)),
      glm::vec3(norm * glm::vec3(cos(2*M_PI/4), sin(2*M_PI/4), nz)),
      glm::vec3(norm * glm::vec3(cos(4*M_PI/4), sin(4*M_PI/4), nz)),
      glm::vec3(norm * glm::vec3(cos(6*M_PI/4), sin(6*M_PI/4), nz)),
   };

   float* orig = glm::value_ptr(start_vtx);
   float* orig_n = glm::value_ptr(start_norm);
   float* base[4] =
   {
      glm::value_ptr(base_pts[0]),
      glm::value_ptr(base_pts[1]),
      glm::value_ptr(base_pts[2]),
      glm::value_ptr(base_pts[3])
   };
   float* base_n[4] =
   {
      glm::value_ptr(base_norms[0]),
      glm::value_ptr(base_norms[1]),
      glm::value_ptr(base_norms[2]),
      glm::value_ptr(base_norms[3])
   };

   std::vector<float> cone_pts;
   for (int i = 0; i < 4; i++)
   {
      addTriangle(
         VertexNorm
      {
         {orig[0],   orig[1],   orig[2]},
         {orig_n[0], orig_n[1], orig_n[2]}
      },
      VertexNorm
      {
         {base[i][0],   base[i][1],   base[i][2]},
         {base_n[i][0], base_n[i][1], base_n[i][2]}
      },
      VertexNorm
      {
         {base[(i+1)%4][0],   base[(i+1)%4][1],   base[(i+1)%4][2]},
         {base_n[(i+1)%4][0], base_n[(i+1)%4][1], base_n[(i+1)%4][2]}
      }
      );
   }
}

void GlBuilder::saveVertex(const GlBuilder::FFState& v)
{
   GLenum dst_buf = is_line ? GL_LINES : GL_TRIANGLES;
   if (is_line || !use_norm)
   {
      if (use_color)
      {
         parent_buf->getBuffer<VertexColor>(dst_buf)
         ->addVertex(VertexColor{v.coords, v.color});
      }
      else if (use_tex)
      {
         parent_buf->getBuffer<VertexTex>(dst_buf)
         ->addVertex(VertexTex{v.coords, v.texcoord});
      }
      else
      {
         parent_buf->getBuffer<Vertex>(dst_buf)
         ->addVertex(Vertex{v.coords});
      }
   }
   else
   {
      if (use_color)
      {
         parent_buf->getBuffer<VertexNormColor>(dst_buf)
         ->addVertex(VertexNormColor{v.coords, v.norm, v.color});
      }
      else if (use_tex)
      {
         parent_buf->getBuffer<VertexNormTex>(dst_buf)
         ->addVertex(VertexNormTex{v.coords, v.norm, v.texcoord});
      }
      else
      {
         parent_buf->getBuffer<VertexNorm>(dst_buf)
         ->addVertex(VertexNorm{v.coords, v.norm});
      }
   }
}