Pixel buffer
Encyclopedia
Pixel buffer or pBuffer is an extension to OpenGL
OpenGL
OpenGL is a standard specification defining a cross-language, cross-platform API for writing applications that produce 2D and 3D computer graphics. The interface consists of over 250 different function calls which can be used to draw complex three-dimensional scenes from simple primitives. OpenGL...

 which allows to do off-screen rendering. It expands upon Vertex Buffer Objects (VBO)
Vertex Buffer Object
A Vertex Buffer Object is an OpenGL extension that provides methods for uploading data to the video device for non-immediate-mode rendering...

 in order to store not only vertex data but also pixel data into the buffer objects.

The pBuffer has been deprecated and replaced by FBOs (Framebuffer Objects)
Framebuffer Object
The frame buffer object architecture is an extension to OpenGL for doing flexible off-screen rendering, including rendering to a texture. By capturing images that would normally be drawn to the screen, it can be used to implement a large variety of image filters, and post-processing effects. The...

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