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glGenRenderbuffers

Name

glGenRenderbuffers — generate renderbuffer object names

C Specification

void glGenRenderbuffers( GLsizei n,
  GLuint *renderbuffers);
 

Parameters

n

Specifies the number of renderbuffer object names to generate.

renderbuffers

Specifies an array in which the generated renderbuffer object names are stored.

Description

glGenRenderbuffers returns n renderbuffer object names in renderbuffers. There is no guarantee that the names form a contiguous set of integers; however, it is guaranteed that none of the returned names was in use immediately before the call to glGenRenderbuffers.

Renderbuffer object names returned by a call to glGenRenderbuffers are not returned by subsequent calls, unless they are first deleted with glDeleteRenderbuffers.

The names returned in renderbuffers are marked as used, for the purposes of glGenRenderbuffers only, but they acquire state and type only when they are first bound.

Errors

GL_INVALID_VALUE is generated if n is negative.

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
glGenRenderbuffers
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