r500/regs/rb3d_ropcntl.txt

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Field Name Bits Default Description
ROP_ENABLE 2 0x0 POSSIBLE VALUES:
00 - Disable ROP. (Forces ROP2 to be 0xC).
01 - Enabled
ROP 11:8 none ROP2 code for 3D fragments. This value is replicated
into 2 nibbles to form the equivalent ROP3 code to
control the ROP3 logic. These are the GDI ROP2 codes.