|
|
|
The D3DRENDERSTATE_ZENABLE render state supports three settings from the D3DZBUFFERTYPE enumerated type.
| Value | Meaning |
|---|---|
| D3DZB_FALSE | Disables all depth buffering. |
| D3DZB_TRUE | Enables z-buffer using perspective correct z. |
| D3DZB_USEW | Disables z-buffering but enables w-buffering, which is eye-relative z. |
Because the exact format used for storing w varies widely, it should be assumed to be opaque.
Surface allocations and depth-fill operations work identically when using w-buffering. All z-buffer compare modes work identically in either case.
For more information, see the DirectX SDK documentation.