qtk/src/meshrenderer.h

/*##############################################################################
## Author: Shaun Reed                                                         ##
## Legal: All Content (c) 2022 Shaun Reed, all rights reserved                ##
## About: MeshRenderer class for quick object creation and drawing            ##
##                                                                            ##
## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
##############################################################################*/
#ifndef QTK_MESHRENDERER_H
#define QTK_MESHRENDERER_H

#include <mesh.h>
#include <object.h>
#include <qtkapi.h>

#include <utility>


namespace Qtk {
  class QTKAPI MeshRenderer : public Object {
  public:
    // Delegate constructors
    MeshRenderer(const char * name, Vertices vertices, Indices indices,
                 DrawMode mode=QTK_DRAW_ARRAYS)
        : MeshRenderer(name, ShapeBase(mode, std::move(vertices), std::move(indices)))
    {}
    explicit MeshRenderer(const char * name)
      : MeshRenderer(name, Cube(QTK_DRAW_ELEMENTS))
  {}
  // Constructor
  MeshRenderer(const char * name, const ShapeBase &shape);
  ~MeshRenderer();

    // Retrieve a mesh by name stored within a static QHash
    static MeshRenderer * getInstance(const QString & name);

    void init();
    void draw();

    // Draw types like GL_TRIANGLES, GL_POINTS, GL_LINES, etc
    void setDrawType(int drawType) { mDrawType = drawType;}

    // Shader settings
    inline void setShaderVertex(const std::string & vert) { mVertexShader = vert;}
    inline void setShaderFragment(const std::string & frag)
    { mFragmentShader = frag;}
    void setShaders(const std::string & vert, const std::string & frag);

    template <typename T>
    inline void setUniform(int location, T value)
    { mProgram.setUniformValue(location, value);}

    template <typename T>
    inline void setUniform(const char * location, T value)
    { mProgram.setUniformValue(location, value);}

    // Set MVP matrix using this Object's transform
    // + View and projection provided by MainWidget static members
    void setUniformMVP(const char * model="uModel", const char * view="uView",
                       const char * projection="uProjection");

    // These functions modify data stored in a VBO
  // + After calling them, the VBO will need to be reallocated
  void setShape(const Shape & value) override;
  void setColor(const QVector3D & color);

    // Static QHash of all mesh objects within the scene
    typedef QHash<QString, MeshRenderer *> MeshManager;
  private:
    static MeshManager sInstances;

    int mDrawType;
    bool mHasTexture;
    std::string mVertexShader, mFragmentShader;
  };
}

#endif // QTK_MESHRENDERER_H