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video/jagblit.c: Emulated buggy blitter YADD behavior (fixes Tempest 2000). (nw)

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This commit is contained in:
Ville Linde 2013-02-11 14:38:19 +00:00
parent 4ec63c2520
commit 91292467d6
1 changed files with 1 additions and 1 deletions
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src/mame/video/jagblit.c
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@ -172,7 +172,7 @@ void jaguar_state::FUNCNAME(UINT32 command, UINT32 a1flags, UINT32 a2flags)
INT32 a2_zoffs = (A2FIXED >> 6) & 7;
INT32 a2_width = ((4 | ((a2flags >> 9) & 3)) << ((a2flags >> 11) & 15)) >> 2;
INT32 a2_xadd = (A2FIXED >> 16) & 0x03;
INT32 a2_yadd = (A2FIXED >> 18) & 0x01;
INT32 a2_yadd = (A1FIXED >> 18) & 0x01; // From Jaguar HW errata: "If the A1 Y add control bit is set it will affect both address generators."
INT32 a2_x = (m_blitter_regs[A2_PIXEL] << 16);
INT32 a2_y = (m_blitter_regs[A2_PIXEL] & 0xffff0000);
INT32 a2_xstep = 0;