glGetRenderbufferParameteriv

glGetRenderbufferParameteriv is a function in the OpenGL graphics API. It is used to retrieve various parameters associated with a renderbuffer object. Renderbuffers are often used as targets for offscreen rendering, such as for creating textures that are updated dynamically or for performing intermediate rendering steps.

The function takes two arguments: a target renderbuffer object and a pname parameter. The target specifies which renderbuffer object's parameters are to be queried. The pname parameter indicates which specific parameter of the renderbuffer is of interest. Common values for pname include GL_RENDERBUFFER_WIDTH, GL_RENDERBUFFER_HEIGHT, GL_RENDERBUFFER_INTERNAL_FORMAT, and GL_RENDERBUFFER_RED_SIZE, GL_RENDERBUFFER_GREEN_SIZE, GL_RENDERBUFFER_BLUE_SIZE, GL_RENDERBUFFER_ALPHA_SIZE, GL_RENDERBUFFER_DEPTH_SIZE, and GL_RENDERBUFFER_STENCIL_SIZE, which provide the dimensions, internal format, and storage allocation for the color, depth, and stencil components of the renderbuffer, respectively.

The retrieved parameter value is then stored in a variable pointed to by the params argument. This function is crucial for understanding the properties of a renderbuffer, which can be necessary for various rendering operations, such as determining the appropriate size for a framebuffer or ensuring compatibility with other rendering targets. It allows applications to introspect and adapt their rendering strategies based on the characteristics of the allocated renderbuffer storage.