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changed some misleading comments too.

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This commit is contained in:
davidhay 2009-05-03 18:39:00 +00:00
parent 20b78c3ae5
commit f618b47a3e
1 changed files with 2 additions and 23 deletions
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25
src/mame/drivers/hng64.c
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@ -811,25 +811,6 @@ static WRITE32_HANDLER( hng64_3d_2_w )
static WRITE32_HANDLER( dl_w )
{
COMBINE_DATA (&hng64_dl[offset]) ;
// !!! There are a few other writes over 0x80 as well - don't forget about those someday !!!
// This method of finding the 85 writes and switching banks seems to work
// the problem is when there are a lot of things to be drawn (more than what can fit in 2*0x80)
// the list doesn't fit anymore, and parts aren't drawn every frame.
// For some reason, if the value at 0x86 and'ed with 0x02 is non-zero, the software just keeps
// checking 0x86 until and'ing it with 2 returns 0... What could change 0x86 if cpu0 is in this infinite loop?
// Why 0x2? And why (see below) does a read of 0x86 only happen when there is data 'hiding'
// in the display list?
// Sends the program into an infinite loop...
// if (offset == 0x85 && hng64_dl[offset] == 0x1) // Just before the second half of the writes
// hng64_dl[0x86] = 0x2 ; // set 0x86 to 2 (so it drops into the loop)
// mame_printf_debug("dl W (%08x) : %.8x %.8x\n", cpu_get_pc(space->cpu), offset, hng64_dl[offset]) ;
}
#if 0
@ -845,18 +826,16 @@ static READ32_HANDLER( dl_r )
// A read at 0x20300217 ONLY happens if there are more display lists than what are readily available.
// Some kind of buffering of the display lists, or 'render current buffer' write?
static WRITE32_HANDLER( dl_control_w )
{
if (activeBuffer==0 || activeBuffer==1)
memcpy(&hng64_dls[activeBuffer][0],&hng64_dl[0],0x200);
// Only if it's VALID
// Only if it's VALID (hack)
if (data == 1 || data == 2)
activeBuffer = data - 1;
// if (offset <= 0x80)
// hng64_dls[activeBuffer][offset] = hng64_dl[offset] ;
}