simple Framebuffer

gistfile1.cpp

class FrameBuffer  
{
private:
    uint bufferID   = 0;
    uint depthID    = 0;
    uint textureID  = 0;
    bool depth      = false;
    uint width      = 0;
    uint height     = 0;

public: 
    FrameBuffer(int w, int h, bool depth = false);
    ~FrameBuffer();
    void setCurrent();
    uint getTextureID()  {return textureID;}
};



FrameBuffer::FrameBuffer(int w, int h, bool depth) : 
	depth(depth),
	width(w),
	height(h)
{
	GLint  maxRBSize; 
    glGetIntegerv(GL_MAX_RENDERBUFFER_SIZE, &maxRBSize);
    if(maxRBSize <= w || maxRBSize <= h)
        FATAL_ERROR("bad framebuffer size : %dx%d ", w,h); 
    glGenFramebuffers(1, &bufferID);
    glGenTextures(1, &textureID);
    glBindTexture(GL_TEXTURE_2D, textureID);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glBindFramebuffer(GL_FRAMEBUFFER, bufferID);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,GL_TEXTURE_2D, textureID, 0);
    if(depth)
    { 
        glGenRenderbuffers(1, &depthID);
    	glBindRenderbuffer(GL_RENDERBUFFER, depthID);
    	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT,w,h);
        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,GL_RENDERBUFFER, depthID);
   	}
    if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
        FATAL_ERROR("FBO %dx%d depth: %d id: %d not complete!", w,h,depth,bufferID); 
}

FrameBuffer::~FrameBuffer()
{
    glDeleteTextures(1, &textureID);
    if(depth) 
        glDeleteRenderbuffers(1, &depthID);
    glDeleteFramebuffers(1, &bufferID);
}

void FrameBuffer::setCurrent()
{
    glViewport(0,0,width,height);
    glBindFramebuffer(GL_FRAMEBUFFER,bufferID);
    if(depth)   glEnable(GL_DEPTH_TEST);
    else        glDisable(GL_DEPTH_TEST);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}