# glFramebufferRenderbuffer

## Name

glFramebufferRenderbuffer — attach a renderbuffer as a logical buffer to the currently bound framebuffer object

## C Specification

 GLsync glFramebufferRenderbuffer( GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);

## Parameters

target

Specifies the framebuffer target. target must be GL_DRAW_FRAMEBUFFER, GL_READ_FRAMEBUFFER, or GL_FRAMEBUFFER. GL_FRAMEBUFFER is equivalent to GL_DRAW_FRAMEBUFFER.

attachment

Specifies the attachment point of the framebuffer.

renderbuffertarget

Specifies the renderbuffer target and must be GL_RENDERBUFFER.

renderbuffer

Specifies the name of an existing renderbuffer object of type renderbuffertarget to attach.

## Description

glFramebufferRenderbuffer attaches a renderbuffer as one of the logical buffers of the currently bound framebuffer object. renderbuffer is the name of the renderbuffer object to attach and must be either zero, or the name of an existing renderbuffer object of type renderbuffertarget. If renderbuffer is not zero and if glFramebufferRenderbuffer is successful, then the renderbuffer name renderbuffer will be used as the logical buffer identified by attachment of the framebuffer currently bound to target.

The value of GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE for the specified attachment point is set to GL_RENDERBUFFER and the value of GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME is set to renderbuffer. All other state values of the attachment point specified by attachment are set to their default values. No change is made to the state of the renderbuuffer object and any previous attachment to the attachment logical buffer of the framebuffer target is broken.

Calling glFramebufferRenderbuffer with the renderbuffer name zero will detach the image, if any, identified by attachment, in the framebuffer currently bound to target. All state values of the attachment point specified by attachment in the object bound to target are set to their default values.

Setting attachment to the value GL_DEPTH_STENCIL_ATTACHMENT is a special case causing both the depth and stencil attachments of the framebuffer object to be set to renderbuffer, which should have the base internal format GL_DEPTH_STENCIL.

## Errors

GL_INVALID_ENUM is generated if target is not one of the accepted tokens.

GL_INVALID_ENUM is generated if renderbuffertarget is not GL_RENDERBUFFER.

GL_INVALID_OPERATION is generated if zero is bound to target.

## Examples

Create a framebuffer object with a renderbuffer-based color attachment and a renderbuffer-based depth attachment.
// fbo_width and fbo_height are the desired width and height of the FBO.
// For Opengl <= 4.4 or if the GL_ARB_texture_non_power_of_two extension
// is present, fbo_width and fbo_height can be values other than 2^n for
// some integer n.

// Build the texture that will serve as the color attachment for the framebuffer.
GLuint color_renderbuffer;
glGenRenderbuffers(1, &color_renderbuffer);
glBindRenderbuffer( GL_RENDERBUFFER, (GLuint)color_renderbuffer );
glRenderbufferStorage( GL_RENDERBUFFER, GL_RGBA8, fbo_width, fbo_height );
glBindRenderbuffer( GL_RENDERBUFFER, 0 );

// Build the texture that will serve as the depth attachment for the framebuffer.
GLuint depth_renderbuffer;
glGenRenderbuffers(1, &depth_renderbuffer);
glBindRenderbuffer( GL_RENDERBUFFER, (GLuint)depth_renderbuffer );
glRenderbufferStorage( GL_RENDERBUFFER, GL_DEPTH_COMPONENT, fbo_width, fbo_height );
glBindRenderbuffer( GL_RENDERBUFFER, 0 );

// Build the framebuffer.
GLuint framebuffer;
glGenFramebuffers(1, &framebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, (GLuint)framebuffer);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, color_renderbuffer);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depth_renderbuffer);

GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE)
// Error

glBindFramebuffer(GL_FRAMEBUFFER, 0);

## API Version Support

OpenGL ES API Version
Function Name 2.0 3.0 3.1
glFramebufferRenderbuffer