Source code

/*
 * OpenGLRenderBuffers.h 
 * Copyright (c) 2015 Antillia.com TOSHIYUKI ARAI. ALL RIGHTS RESERVED. 
 */


#pragma once

#ifdef GL_ARB_framebuffer_object

#include <viz++/opengl/OpenGLObject.h>

namespace VIZ {

class OpenGLRenderBuffers :public OpenGLObject {

private:
  GLsizei size;
  GLuint*  buffers;

protected:
  void generate(GLsizei size, GLuint* buffers)
  {
    static PFNGLGENRENDERBUFFERSPROC glGenRenderbuffers = NULL;
    if (glGenRenderbuffers == NULL) {
      glGenRenderbuffers = (PFNGLGENRENDERBUFFERSPROC)load("glGenRenderbuffers");
    }    
    glGenRenderbuffers(size, buffers);
  }
  
  //destroy renderbuffer
  void destroy()
  {
    static PFNGLDELETERENDERBUFFERSPROC glDeleteRenderbuffers = NULL;
    if (glDeleteRenderbuffers == NULL) {
      glDeleteRenderbuffers = (PFNGLDELETERENDERBUFFERSPROC)load("glDeleteRenderbuffers");
    }
    glDeleteRenderbuffers(size, buffers);
  }

  void bind(GLenum target, GLuint buffer) 
  {
    static PFNGLBINDRENDERBUFFERPROC glBindRenderbuffer = NULL;
    if (glBindRenderbuffer == NULL) {
      glBindRenderbuffer = (PFNGLBINDRENDERBUFFERPROC)load("glBindRenderbuffer");
    }
    glBindRenderbuffer(target, buffer);
  }
 
public:
  OpenGLRenderBuffers(GLsizei n)
  :OpenGLObject(),
  size(n),
  buffers(NULL)
  {
    if (size < 1) {
      throw IException("Invalid parameters. size=%d", size);
    }
    buffers = new GLuint[size];
    
    generate(size, buffers);
  }
  

  ~OpenGLRenderBuffers()
  {
    destroy();
    delete [] buffers;
    buffers = NULL;
  }
  
 
  GLuint getNth(int n)
  {
    if (n >= 0 && n < size) {
      return buffers[n]; 
    } else {
        throw IException("Invalid nth parameter %d", n);
    }    
  }
  
  void bindNth(GLenum target, int n)
  {
    if (n >= 0 && n < size) {
      bind(target, buffers[n]); 
    } else {
        throw IException("Invalid nth parameter %d", n);
    }
  }
  
  void getParameteriv(GLenum target, GLenum pname, GLint* params)
  {
    static PFNGLGETRENDERBUFFERPARAMETERIVPROC glGetRenderbufferParameteriv = NULL;
    if (glGetRenderbufferParameteriv == NULL) {
      glGetRenderbufferParameteriv = (PFNGLGETRENDERBUFFERPARAMETERIVPROC)load("glGetRenderbufferParameteriv");
    }
    glGetRenderbufferParameteriv(target, pname, params);
  }

  GLboolean isRenderbuffer(GLuint buffer)
  {
    static PFNGLISRENDERBUFFERPROC glIsRenderbuffer = NULL;
    if (glIsRenderbuffer == NULL) {
      glIsRenderbuffer = (PFNGLISRENDERBUFFERPROC)load("glIsRenderbuffer");
    }
    return glIsRenderbuffer(buffer);
  }

  void storage(GLenum target, GLenum internalformat, GLsizei width, GLsizei height)
  {
    static PFNGLRENDERBUFFERSTORAGEPROC glRenderbufferStorage = NULL;
    if (glRenderbufferStorage == NULL) {
      glRenderbufferStorage = (PFNGLRENDERBUFFERSTORAGEPROC)load("glRenderbufferStorage");
    }
    glRenderbufferStorage(target, internalformat, width, height);
  }
  
};

}
#endif