al_Mesh.hpp

#ifndef INCLUDE_AL_GRAPHICS_MESH_HPP
#define INCLUDE_AL_GRAPHICS_MESH_HPP
 
/*  Allocore --
  Multimedia / virtual environment application class library
 
  Copyright (C) 2009. AlloSphere Research Group, Media Arts & Technology, UCSB.
  Copyright (C) 2012. The Regents of the University of California.
  All rights reserved.
 
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
 
    Redistributions of source code must retain the above copyright notice,
    this list of conditions and the following disclaimer.
 
    Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
 
    Neither the name of the University of California nor the names of its
    contributors may be used to endorse or promote products derived from
    this software without specific prior written permission.
 
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.
 
 
  File description:
  A generic mesh object for vertex-based geometry
 
  File author(s):
  Wesley Smith, 2010, wesley.hoke@gmail.com
  Lance Putnam, 2010, putnam.lance@gmail.com
  Graham Wakefield, 2010, grrrwaaa@gmail.com
  Keehong Youn, 2017, younkeehong@gmail.com
 
*/
 
#include "al/graphics/al_OpenGL.hpp"
#include "al/math/al_Mat.hpp"
#include "al/math/al_Vec.hpp"
#include "al/types/al_Color.hpp"
#include <vector>
 
namespace al {
 
 
class Mesh {
public:
  enum Primitive : unsigned int {
    POINTS = GL_POINTS,
    LINES = GL_LINES,
    LINE_STRIP = GL_LINE_STRIP,
    LINE_LOOP = GL_LINE_LOOP,
    TRIANGLES = GL_TRIANGLES,
    TRIANGLE_STRIP = GL_TRIANGLE_STRIP,
    TRIANGLE_FAN = GL_TRIANGLE_FAN,
    LINES_ADJACENCY = GL_LINES_ADJACENCY,
    LINE_STRIP_ADJACENCY = GL_LINE_STRIP_ADJACENCY,
    TRIANGLES_ADJACENCY = GL_TRIANGLES_ADJACENCY,
    TRIANGLE_STRIP_ADJACENCY = GL_TRIANGLE_STRIP_ADJACENCY
  };
 
  typedef Vec3f Vertex;
  typedef Vec3f Normal;
  typedef float TexCoord1;
  typedef Vec2f TexCoord2;
  typedef Vec3f TexCoord3;
  typedef unsigned int Index;
 
  typedef std::vector<Vertex> Vertices;
  typedef std::vector<Normal> Normals;
  typedef std::vector<Color> Colors;
  typedef std::vector<TexCoord1> TexCoord1s;
  typedef std::vector<TexCoord2> TexCoord2s;
  typedef std::vector<TexCoord3> TexCoord3s;
  typedef std::vector<Index> Indices;
 
  Mesh(Primitive p = TRIANGLES);
 
  Mesh(const Mesh &cpy);
 
  void copy(Mesh const &m);
 
 
  void getBounds(Vec3f &min, Vec3f &max) const;
 
  Vec3f getCenter() const;
 
  // destructive edits to internal vertices:
 
  void compress();
 
  void decompress();
 
 
  void equalizeBuffers();
 
  void merge(const Mesh &src);
 
  void toTriangles();
 
  Mesh &reset();
 
  void unitize(bool proportional = true);
 
  Mesh &scale(float x, float y, float z);
  Mesh &scale(float s) { return scale(s, s, s); }
 
  template <class T> Mesh &scale(const Vec<3, T> &v) {
    return scale(v[0], v[1], v[2]);
  }
 
  Mesh &translate(float x, float y, float z);
 
  template <class T> Mesh &translate(const Vec<3, T> &v) {
    return translate(v[0], v[1], v[2]);
  }
 
  template <class T> Mesh &translate(const T &v) { return translate(v, v, v); }
 
 
  template <class T>
  Mesh &transform(const Mat<4, T> &m, int begin = 0, int end = -1);
 
 
  void generateNormals(bool normalize = true, bool equalWeightPerFace = false);
 
  void invertNormals();
 
 
  void createNormalsMesh(Mesh &mesh, float length = 0.1, bool perFace = false);
 
 
  void ribbonize(float width = 0.04, bool faceBinormal = false) {
    ribbonize(&width, 0, faceBinormal);
  }
 
 
  void ribbonize(float *widths, int widthsStride = 1,
                 bool faceBinormal = false);
 
 
  void smooth(float amount = 1, int weighting = 0);
 
  Primitive primitive() const { return mPrimitive; }
  const std::vector<Vertex> &vertices() const { return mVertices; }
  const std::vector<Normal> &normals() const { return mNormals; }
  const std::vector<Color> &colors() const { return mColors; }
  const std::vector<TexCoord1> &texCoord1s() const { return mTexCoord1s; }
  const std::vector<TexCoord2> &texCoord2s() const { return mTexCoord2s; }
  const std::vector<TexCoord3> &texCoord3s() const { return mTexCoord3s; }
  const std::vector<Index> &indices() const { return mIndices; }
 
  // virtual for graphics lib implementations
  Mesh &primitive(Primitive p) {
    mPrimitive = p;
    return *this;
  }
 
  Mesh &repeatLast();
 
  void index(unsigned int i) { indices().push_back(i); }
 
  template <class Tindex>
  void index(const Tindex *buf, int size, Tindex indexOffset = 0) {
    for (int i = 0; i < size; ++i)
      index((Index)(buf[i] + indexOffset));
  }
 
  template <class... Indices> void index(unsigned i, Indices... indices) {
    index(i);
    index(indices...);
  }
 
  void color(const Color &v) { colors().push_back(v); }
 
  void color(const HSV &v) { colors().push_back(v); }
 
  void color(const RGB &v) { colors().push_back(v); }
 
  void color(float r, float g, float b, float a = 1) {
    color(Color(r, g, b, a));
  }
 
  template <class T> void color(const Vec<4, T> &v) {
    color(v[0], v[1], v[2], v[3]);
  }
 
  template <class T> void color(const T *src, int numColors) {
    for (int i = 0; i < numColors; ++i)
      color(src[4 * i + 0], src[4 * i + 1], src[4 * i + 2], src[4 * i + 3]);
  }
 
  void normal(float x, float y, float z = 0) { normal(Normal(x, y, z)); }
 
  void normal(const Normal &v) { normals().push_back(v); }
 
  template <class T> void normal(const Vec<2, T> &v, float z = 0) {
    normal(v[0], v[1], z);
  }
 
  template <class T> void normal(const T *src, int numNormals) {
    for (int i = 0; i < numNormals; ++i)
      normal(src[3 * i + 0], src[3 * i + 1], src[3 * i + 2]);
  }
 
  void texCoord(float u) { texCoord1s().push_back(TexCoord1(u)); }
 
  void texCoord(float u, float v) { texCoord2s().push_back(TexCoord2(u, v)); }
 
  template <class T> void texCoord(const Vec<2, T> &v) { texCoord(v[0], v[1]); }
 
  void texCoord(float u, float v, float w) {
    texCoord3s().push_back(TexCoord3(u, v, w));
  }
 
  template <class T> void texCoord(const Vec<3, T> &v) {
    texCoord(v[0], v[1], v[2]);
  }
 
  void vertex(float x, float y, float z = 0) { vertex(Vertex(x, y, z)); }
 
  void vertex(const Vertex &v) { vertices().push_back(v); }
 
  template <class T> void vertex(const Vec<2, T> &v, float z = 0) {
    vertex(v[0], v[1], z);
  }
 
  template <class T> void vertex(const T *src, int numVerts) {
    for (int i = 0; i < numVerts; ++i)
      vertex(src[3 * i + 0], src[3 * i + 1], src[3 * i + 2]);
  }
 
  template <class T> void vertex(const Vec<3, T> *src, int numVerts) {
    for (int i = 0; i < numVerts; ++i)
      vertex(src[i][0], src[i][1], src[i][2]);
  }
 
  Vertices &vertices() { return mVertices; }
  Normals &normals() { return mNormals; }
  Colors &colors() { return mColors; }
  TexCoord1s &texCoord1s() { return mTexCoord1s; }
  TexCoord2s &texCoord2s() { return mTexCoord2s; }
  TexCoord3s &texCoord3s() { return mTexCoord3s; }
  Indices &indices() { return mIndices; }
 
 
  bool save(const char *filePath, const char *solidName = "",
            bool binary = true) const;
 
 
  bool saveSTL(const char *filePath, const char *solidName = "") const;
 
 
  bool savePLY(const char *filePath, const char *solidName = "",
               bool binary = true) const;
 
  void print(FILE *dst = stderr) const;
 
protected:
  // Only populated (size>0) buffers will be used
  Vertices mVertices;
  Normals mNormals;
  Colors mColors;
  TexCoord1s mTexCoord1s;
  TexCoord2s mTexCoord2s;
  TexCoord3s mTexCoord3s;
  Indices mIndices;
 
  Primitive mPrimitive;
};
 
template <class T>
Mesh &Mesh::transform(const Mat<4, T> &m, int begin, int end) {
  if (end < 0)
    end += vertices().size() + 1; // negative index wraps to end of array
  for (int i = begin; i < end; ++i) {
    Vertex &v = vertices()[i];
    v.set(m * Vec<4, T>(v, 1));
  }
  return *this;
}
 
} // namespace al
 
#endif