omni::visual::Framebuffer32F Class Reference

Framebuffer with 32-bit float pixel depth per channel. More...

#include <Framebuffer32F.h>

Public Member Functions
	Framebuffer32F ()
	Framebuffer32F (QSize const &)
	~Framebuffer32F ()
int	width () const
	Return width of framebuffer. More...
int	height () const
	Return height of framebuffer. More...
QSize const &	size () const
	Return size of framebuffer. More...
void	initialize (QSize const &)
GLuint	texture () const
void	bind ()
void	release ()
void	destroy ()
	Free buffer from current context. More...

Private Attributes
QSize	size_
GLuint	fb_ = 0
GLuint	colorTex_ = 0
GLuint	depthRb_ = 0

Detailed Description

Framebuffer with 32-bit float pixel depth per channel.

Constructor & Destructor Documentation

omni::visual::Framebuffer32F::Framebuffer32F

(

)

                                   {

    }

omni::visual::Framebuffer32F::Framebuffer32F

(

QSize const &

_size

)

                                                     {
      initialize(_size);
    }

omni::visual::Framebuffer32F::~Framebuffer32F

(

)

                                    {
      destroy();
    }

Member Function Documentation

void omni::visual::Framebuffer32F::bind

(

)

                              {
      withCurrentContext([&](QOpenGLFunctions& _) {
        _.glBindFramebuffer(GL_FRAMEBUFFER, fb_);
      });
    }

void omni::visual::Framebuffer32F::destroy

(

)

Free buffer from current context.

                                 {
      withCurrentContext([&](QOpenGLFunctions& _) {
        if (colorTex_) _.glDeleteTextures(1, &colorTex_);
        if (depthRb_) _.glDeleteRenderbuffers(1, &depthRb_);
        if (fb_) _.glDeleteFramebuffers(1, &fb_);
        size_ = QSize(0,0);
      });
    }

int omni::visual::Framebuffer32F::height

(

)

const

Return height of framebuffer.

                                     {

      return size().height();
    }

void omni::visual::Framebuffer32F::initialize

(

QSize const &

_size

)

                                                      {
      if (_size == size()) return;

      withCurrentContext([&](QOpenGLFunctions& _) {
        destroy();

        int _h = _size.height();
        int _w = _size.width();
        // RGBA32F 2D texture to render to
        _.glGenTextures(1, &colorTex_);
        _.glBindTexture(GL_TEXTURE_2D, colorTex_);
        _.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,     GL_CLAMP_TO_EDGE);
        _.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,     GL_CLAMP_TO_EDGE);
        _.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        _.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

        // NULL means reserve texture memory, but texels are undefined
        _.glTexImage2D(GL_TEXTURE_2D, 0,  GL_RGBA32F , _w, _h, 0, GL_RGBA,
                       GL_FLOAT, NULL);

        // -------------------------
        _.glGenFramebuffers(1, &fb_);
        bind();

        //   Attach 2D texture to this FBO
        _.glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                 GL_TEXTURE_2D, colorTex_, 0);


        // -------------------------
        _.glGenRenderbuffers(1, &depthRb_);
        _.glBindRenderbuffer(GL_RENDERBUFFER, depthRb_);
        _.glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, _w,
                                _h);

        // -------------------------
        // Attach depth buffer to FBO
        _.glFramebufferRenderbuffer(GL_FRAMEBUFFER,
                                    GL_DEPTH_ATTACHMENT,
                                    GL_RENDERBUFFER, depthRb_);

        // -------------------------
        // Does the GPU support current FBO configuration?
        GLenum status;
        status = _.glCheckFramebufferStatus(GL_FRAMEBUFFER);

        if (status != GL_FRAMEBUFFER_COMPLETE) {
          destroy();
          return;
        }
        size_ = QSize(_w,_h);
        _.glBindTexture(GL_TEXTURE_2D,0);
        _.glBindRenderbuffer(GL_RENDERBUFFER,0);
        release();
      });
    }

void omni::visual::Framebuffer32F::release

(

)

                                 {
      withCurrentContext([&](QOpenGLFunctions& _) {
        QOpenGLFramebufferObject::bindDefault();
      });
    }

QSize const & omni::visual::Framebuffer32F::size

(

)

const

Return size of framebuffer.

                                            {
      return size_;
    }

GLuint omni::visual::Framebuffer32F::texture

(

)

const

                                         {
      return colorTex_;
    }

int omni::visual::Framebuffer32F::width

(

)

const

Return width of framebuffer.

                                    {
      return size().width();
    }

Field Documentation

GLuint omni::visual::Framebuffer32F::colorTex_ = 0

private

GLuint omni::visual::Framebuffer32F::depthRb_ = 0

private

GLuint omni::visual::Framebuffer32F::fb_ = 0

private

QSize omni::visual::Framebuffer32F::size_

private

---

The documentation for this class was generated from the following files:

• include/omni/visual/Framebuffer32F.h
• src/lib/visual/Framebuffer32F.cpp