mesh.h

// Copyright, 2020, Savvy Sine, Aline Normoyle
#ifndef AGL_MESH_H_
#define AGL_MESH_H_
 
#include <vector>
#include "agl/agl.h"
#include "agl/aglm.h"
 
namespace agl {
 
class Mesh {
 public:
  virtual ~Mesh();
 
  virtual void render() const = 0;
 
  GLuint vao() const { return _vao; }
 
  bool hasUV() const { return _hasUV; }
 
  bool isDynamic() const { return _isDynamic; }
 
 protected:
  GLuint _nVerts = 0;      // Number of unique vertices
  GLuint _vao = 0;         // The Vertex Array Object
  bool _hasUV = false;
  bool _isDynamic = false;
  bool _initialized = false;
  std::vector<GLuint> _buffers;   // vertex buffers
  std::vector<GLfloat> _data[5];  // State for dynamic meshes
  enum VertexAttribute {
    INDEX = 0,
    POSITION,
    NORMAL,
    UV,
    TANGENT,
    NUM_ATTRIBUTES
  };
 
  int numVertices() const { return _nVerts; }
 
  void setVertexData(VertexAttribute type, int vertexId, const glm::vec4& data);
 
  glm::vec4 vertexData(VertexAttribute type, int vertexId) const;
 
  virtual void setIsDynamic(bool on);
 
  virtual void init() = 0;
 
  void initBuffers(
    std::vector<GLfloat>* points,
    std::vector<GLfloat>* normals,
    std::vector<GLfloat>* texCoords = nullptr,
    std::vector<GLfloat>* tangents = nullptr);
 
  virtual void deleteBuffers();
};
 
}  // namespace agl
#endif  // AGL_MESH_H_