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PicoVideoRead optimization

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@511 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2008-07-01 16:12:04 +00:00
parent 2aa27095f2
commit 9761a7d0d4
10 changed files with 90 additions and 64 deletions
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3
Pico/Pico.c
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@ -218,7 +218,8 @@ PICO_INTERNAL int CheckDMA(void)
if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?
if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?
xfers_can = dma_timings[dma_op];
if(xfers <= xfers_can) {
if(xfers <= xfers_can)
{
if(dma_op&2) Pico.video.status&=~2; // dma no longer busy
else {
burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..