Applications can direct a Direct3D device to render primitives using solid or patterned lines. Applications can also stretch a particular line pattern if the device supports repeating the pattern. The device's driver must set the D3DPMISCCAPS_LINEPATTERNREP flag to indicate that the device supports repeating a particular line pattern. How this flag is set depends on the DirectX version:
For DirectX 7.0 and earlier, set this flag in the dwMiscCaps member of the D3DPRIMCAPS structure.
For DirectX 8.0 and later, set this flag in the PrimitiveMiscCaps member of the D3DCAPSXx structure, where Xx indicates the DirectX version (for example, D3DCAPS8 for version 8 and D3DCAPS9 for version 9). D3DCAPS8 and D3DCAPS9 are described in their respective versions of the DirectX SDK documentation.
When applications set the render-state value for the D3DRENDERSTATE_LINEPATTERN (or D3DRS_LINEPATTERN) render state, they can specify the number of times to repeat the line pattern by setting the wRepeatFactor member of the D3DLINEPATTERN structure. Applications can set this member to a maximum value of 65535 (16-bit value). However, hardware only supports a maximum of 255 (8-bit value). Therefore, a display driver must fail a request that attempts to set the line-pattern-repetition number to a value greater than 255 as an invalid request. D3DLINEPATTERN is described in the DirectX SDK documentation.