3D Graphics Programming with QuickDraw 3D 1.5.4

Buffer Drawing Operations

A drawing engine may support an OpenGL buffer drawing mode that determines which color buffers a drawing engine draws into. You specify one or more buffers by assigning a value to the kQATagGL_DrawBuffer state variable of that engine. The default value of this variable for a drawing engine that supports OpenGL buffering is kQAGL_DrawBuffer_Front for single-buffered contexts and kQAGL_DrawBuffer_Back for double-buffered contexts. You can use the following masks to specify a buffer drawing mode.



 
#define kQAGL_DrawBuffer_None                       0

#define kQAGL_DrawBuffer_FrontLeft                  (1 << 0)

#define kQAGL_DrawBuffer_FrontRight                 (1 << 1)

#define kQAGL_DrawBuffer_BackLeft                   (1 << 2)

#define kQAGL_DrawBuffer_BackRight                  (1 << 3)

#define kQAGL_DrawBuffer_Front                      \

        (kQAGL_DrawBuffer_FrontLeft | kQAGL_DrawBuffer_FrontRight)

#define kQAGL_DrawBuffer_Back                       \

        (kQAGL_DrawBuffer_BackLeft | kQAGL_DrawBuffer_BackRight)

Constant descriptions

kQAGL_DrawBuffer_None: The drawing engine draws into no color buffer.
kQAGL_DrawBuffer_FrontLeft: The drawing engine draws into the front left buffer only.
kQAGL_DrawBuffer_FrontRight: The drawing engine draws into the front right buffer only.
kQAGL_DrawBuffer_BackLeft: The drawing engine draws into the back left buffer only.
kQAGL_DrawBuffer_BackRight: The drawing engine draws into the back right buffer only.
kQAGL_DrawBuffer_Front: The drawing engine draws into the front left and right buffers only.
kQAGL_DrawBuffer_Back: The drawing engine draws into the back left and right buffers only.