MeVis/Foundation/Sources/MLOpenGL/mlGLResourceManager.h

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// **InsertLicense** code
//----------------------------------------------------------------------------------

//----------------------------------------------------------------------------------

#ifndef __mlGLResourceManager_H
#define __mlGLResourceManager_H

#include "mlOpenGLSystem.h"
#include "mlOpenGL.h"

class FTFont;

ML_OPENGL_START_NAMESPACE

class GLResource;

class MLOPENGL_EXPORT GLResourceManager {
public:
  GLResourceManager();
  virtual ~GLResourceManager();

public:
  static void init();

  static void cleanup();

  static GLResourceManager* self() { return _self;  }

  bool isContextActive() const { return !_contextLocked; }

  void destroyTextures(int num, GLuint* textures);
  void destroyFragmentProgramARB(GLuint program);
  void destroyRenderBuffer(GLuint id);
  void destroyFrameBuffer(GLuint id);
  void destroyVertexBuffer(GLuint id);
  void destroyPixelBuffer(GLuint id);
  void destroyDisplayList(GLuint id);
  void destroyGLSLShader(GLuint id);
  void destroyGLSLProgram(GLuint id);
  void destroyFTFont(FTFont* font);

  void detachGLSLShader(GLuint program, GLuint shader);
  
  void disableGLSLProgram();

  void unlockContext(unsigned int cacheContextId);

  void lockContext();

  unsigned int cacheContextID() { return _cacheContextID; };
  
  GLenum getGLError() const;

protected:
  void addResource(GLResource* program);
  void removeResource(GLResource* program);

  void contextDestroyed();

  void freeResources();

  class MLOPENGL_EXPORT GLResourceList {
  public:
    GLResourceList() { _head = NULL; _tail = NULL; _length = 0; }
    
    GLResource* _head;
    GLResource* _tail;
    int _length;
  };

  void add(GLResourceList& list, GLResource* resource);
  void remove(GLResourceList& list, GLResource* resource);

  friend class GLResource;

  bool         _contextLocked;
  unsigned int _cacheContextID;

  GLResourceList _resources;

  typedef std::pair<GLuint, GLuint> GLSLProgramShaderPair;

  std::vector<GLuint> _texturesToFree;
  std::vector<GLuint> _programsARBToFree;
  std::vector<GLuint> _frameBuffersToFree;
  std::vector<GLuint> _renderBuffersToFree;
  std::vector<GLuint> _vertexBuffersToFree;
  std::vector<GLuint> _pixelBuffersToFree;
  std::vector<GLuint> _displayListsToFree;
  std::vector<GLuint> _GLSLProgramsToFree;
  std::vector<GLuint> _GLSLShadersToFree;
  std::vector<GLSLProgramShaderPair> _GLSLShadersToDetach;
  std::vector<FTFont*> _FTFontsToFree;

  static GLResourceManager* _self;
};

ML_OPENGL_END_NAMESPACE

#endif