D3DHAL_DP2LINELIST structure

One D3DHAL_DP2LINELIST structure is parsed from the command buffer by the D3dDrawPrimitives2 callback when the D3DHAL_DP2COMMAND structure's bCommand member is set to D3DDP2OP_LINELIST, and is used to render unconnected line segments.

Syntax


typedef struct _D3DHAL_DP2LINELIST {
  WORD wVStart;
} D3DHAL_DP2LINELIST, *LPD3DHAL_DP2LINELIST;

Members

wVStart

Specifies the index into the vertex buffer containing coordinate data for the initial vertex of the line list.

Remarks

One D3DHAL_DP2LINELIST structure follows the D3DHAL_DP2COMMAND structure in the command buffer.

D3dDrawPrimitives2 should sequentially process a total of wPrimitiveCount * 2 vertices from the vertex buffer, two vertices per line, rendering a total of wPrimitiveCount lines. Starting from the vertex buffer offset, the sequence of lines rendered is (wVStart, wVStart + 1), (wVStart + 2, wVStart + 3),..., (wVStart + (wPrimitiveCount -1 ) * 2, wVStart + (wPrimitiveCount * 2 - 1)). The value of wPrimitiveCount is specified in the D3DHAL_DP2COMMAND structure.

The following figure shows a portion of a sample command buffer containing a D3DDP2OP_LINELIST command and one D3DHAL_DP2LINELIST structure. The driver should draw three lines using the following six vertices from the vertex buffer: (v[0], v[1]), (v[2], v[3]), (v[4], v[5]).

Figure showing a command buffer with a D3DDP2OP_LINELIST command and one D3DHAL_DP2LINELIST structure

Requirements

Header

D3dhal.h (include D3dhal.h)

See also

D3DDP2OP_LINELIST
D3dDrawPrimitives2
D3DHAL_DP2COMMAND

 

 

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