GLRENDERBUFFERWIDTH

GLRENDERBUFFERWIDTH is a constant used in the OpenGL API, specifically within the context of framebuffer objects (FBOs). It represents the width of a renderbuffer object, which is a storage area for rendering operations. Renderbuffers are often used as attachments to FBOs, providing a way to store color, depth, or stencil data.

The GLRENDERBUFFERWIDTH constant is queried using the glGetRenderbufferParameteriv function. This function retrieves the value of a specified parameter for a renderbuffer object. When queried with GLRENDERBUFFERWIDTH, it returns the width of the renderbuffer in pixels.

The width of a renderbuffer is an important parameter as it determines the horizontal resolution of the rendering operations that will be performed on it. It is typically set when the renderbuffer is created or resized using the glRenderbufferStorage function.

It's worth noting that the width of a renderbuffer can be different from the width of the window or viewport in which it is used. This is because renderbuffers can be used for off-screen rendering, where the rendering operations are not directly displayed on the screen.

In summary, GLRENDERBUFFERWIDTH is a constant used in OpenGL to query the width of a renderbuffer object. It is an important parameter for understanding the resolution and capabilities of rendering operations performed on the renderbuffer.