3D Graphics Programming with QuickDraw 3D 1.5.4
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Draw Context Flags Masks
The flags parameter passed to the QADrawContextNew function specifies a set of bit flags that control features of the new draw context. You can use these masks to configure the flags parameter.
#define kQAContext_None 0
#define kQAContext_NoZBuffer (1 << 0)
#define kQAContext_DeepZ (1 << 1)
#define kQAContext_DoubleBuffer (1 << 2)
#define kQAContext_Cache (1 << 3)
Constant descriptions
- kQAContext_None
- Pass this value for no draw context features.
- kQAContext_NoZBuffer
- The new draw context should not be z buffered.
- kQAContext_DeepZ
- The new draw context should have a z buffer with at least 24 bits of precision.
- kQAContext_DoubleBuffer
- The new draw context should be double buffered.
- kQAContext_Cache
- The new draw context should be used for a draw context cache. When you create a draw context with this feature, it is always considered a draw context cache. Accordingly, objects rendered into a draw context cache never appear on the device (not even on a memory device). The only way to view objects rendered into a draw context cache is to use that cache to initialize a non-cached draw context.
© 1997 Apple Computer, Inc.
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