Shader Relative Addressing

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Pixel and vertex shader versions that support relative addressing can specify that relative addressing is used in bit 13 of destination and source parameter tokens. When relative addressing is specified, an additional DWORD token follows the destination or source parameter token.

Note that this relative-addressing token is present only for vertex shader version 2_0 and later and for pixel shader version 3_0 and later. Relative addressing is not used for pixel shader versions earlier than 3_0.

This relative-addressing token is formatted the same as the destination or source parameter token and the following rules apply:

  • Only D3DSPR_ADDR or D3DSPR_LOOP can be used as register types.

  • Swizzle bits in source parameter tokens are used to determine a register component.

  • Bit 31 is 0x1.

  • Register offset is used.

  • All other bits are not used.

Address registers and the aL register are used for relative addressing of constant registers.

Requirements

Available in Windows Vista and later versions of the Windows operating systems.