D3DCLIPSTATUS9 structure
Describes the current clip status.
Syntax
typedef struct D3DCLIPSTATUS9 { DWORD ClipUnion; DWORD ClipIntersection; } D3DCLIPSTATUS9, *LPD3DCLIPSTATUS9;
Members
- ClipUnion
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Type: DWORD
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Clip union flags that describe the current clip status. This member can be one or more of the following flags:
- ClipIntersection
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Type: DWORD
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Clip intersection flags that describe the current clip status. This member can take the same flags as ClipUnion.
Remarks
When clipping is enabled during vertex processing (by ProcessVertices, DrawPrimitive, or other drawing functions), Direct3D computes a clip code for every vertex. The clip code is a combination of D3DCS_* bits. When a vertex is outside a particular clipping plane, the corresponding bit is set in the clipping code. Direct3D maintains the clip status using D3DCLIPSTATUS9, which has ClipUnion and ClipIntersection members. ClipUnion is a bitwise OR of all vertex clip codes and ClipIntersection is a bitwise AND of all vertex clip codes. Initial values are zero for ClipUnion and 0xFFFFFFFF for ClipIntersection. When D3DRS_CLIPPING is set to FALSE, ClipUnion and ClipIntersection are set to zero. Direct3D updates the clip status during drawing calls. To compute clip status for a particular object, set ClipUnion and ClipIntersection to their initial value and continue drawing.
Clip status is not updated by DrawRectPatch and DrawTriPatch because there is no software emulation for them.
Requirements
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See also