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vdp DMA optimizations

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This commit is contained in:
kub 2020-04-02 20:18:39 +02:00
parent 84e18560bb
commit 86198e034b
1 changed files with 36 additions and 31 deletions
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55
pico/videoport.c
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@ -163,7 +163,7 @@ static int PicoVideoFIFODrain(int level, int cycles, int bgdma)
// process FIFO entries until low level is reached
while (vf->fifo_slot < vf->fifo_maxslot && cycles < 488 &&
(vf->fifo_total > level || (vf->fifo_queue[vf->fifo_qx] & bgdma))) {
((vf->fifo_total > level) | (vf->fifo_queue[vf->fifo_qx] & bgdma))) {
int b = vf->fifo_queue[vf->fifo_qx] & FQ_BYTE;
int cnt = bgdma ? pv->fifo_cnt : ((vf->fifo_total-level)<<b) - (pv->fifo_cnt&b);
int slot = (pv->fifo_cnt<cnt ? pv->fifo_cnt:cnt) + vf->fifo_slot;
@ -283,10 +283,10 @@ int PicoVideoFIFOHint(void)
vf->fifo_slot = 0;
// if CPU is waiting for the bus, advance CPU and FIFO until bus is free
if (pv->status & PVS_CPURD)
burn = PicoVideoFIFORead();
else if (pv->status & PVS_CPUWR)
if (pv->status & PVS_CPUWR)
burn = PicoVideoFIFOWrite(0, 0, 0, 0);
else if (pv->status & PVS_CPURD)
burn = PicoVideoFIFORead();
return burn;
}
@ -458,19 +458,16 @@ static void DmaSlow(int len, unsigned int source)
switch (Pico.video.type)
{
case 1: // vram
#if 0
r = PicoMem.vram;
if (inc == 2 && !(a & 1) && (a >> 16) == ((a + len*2) >> 16) &&
(source & ~mask) == ((source + len-1) & ~mask) &&
(a << 16 >= (SATaddr+0x280)<<16 || (a + len*2) << 16 <= SATaddr<<16))
if (inc == 2 && !(a & 1) && (a & ~0xffff) == ((a + len*2-1) & ~0xffff) &&
((a >= SATaddr+0x280) | ((a + len*2-1) < SATaddr)) &&
(source & ~mask) == ((source + len-1) & ~mask))
{
// most used DMA mode
memcpy((char *)r + a, base + (source & mask), len * 2);
a += len * 2;
break;
}
else
#endif
{
for(; len; len--)
{
u16 d = base[source++ & mask];
@ -479,7 +476,6 @@ static void DmaSlow(int len, unsigned int source)
// AutoIncrement
a = (a+inc) & ~0x20000;
}
}
break;
case 3: // cram
@ -569,6 +565,14 @@ static NOINLINE void DmaFill(int data)
switch (Pico.video.type)
{
case 1: // vram
if (inc == 1 && (a & ~0xffff) == ((a + len-1) & ~0xffff) &&
((a >= SATaddr+0x280) | ((a + len-1) < SATaddr)))
{
// most used DMA mode
memset(vr + (u16)a, high, len);
a += len;
break;
}
for (l = len; l; l--) {
// Write upper byte to adjacent address
// (here we are byteswapped, so address is already 'adjacent')
@ -662,9 +666,8 @@ static NOINLINE void CommandDma(void)
Pico.video.reg[0x16] = source >> 8;
}
static NOINLINE void CommandChange(void)
static NOINLINE void CommandChange(struct PicoVideo *pvid)
{
struct PicoVideo *pvid = &Pico.video;
unsigned int cmd, addr;
cmd = pvid->command;
@ -718,7 +721,7 @@ PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)
DrawSync(0); // XXX it's unclear when vscroll data is fetched from vsram?
if (pvid->pending) {
CommandChange();
CommandChange(pvid);
pvid->pending=0;
}
@ -749,7 +752,7 @@ PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)
pvid->command &= 0xffff0000;
pvid->command |= d;
pvid->pending = 0;
CommandChange();
CommandChange(pvid);
// Check for dma:
if (d & 0x80) {
DrawSync(SekCyclesDone() - Pico.t.m68c_line_start <= 488-390);
@ -896,7 +899,7 @@ PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)
struct PicoVideo *pv = &Pico.video;
unsigned int d = VideoSr(pv);
if (pv->pending) {
CommandChange();
CommandChange(pv);
pv->pending = 0;
}
elprintf(EL_SR, "SR read: %04x [%u] @ %06x", d, SekCyclesDone(), SekPc);
@ -953,10 +956,11 @@ unsigned char PicoVideoRead8DataL(void)
unsigned char PicoVideoRead8CtlH(void)
{
u8 d = VideoSr(&Pico.video) >> 8;
if (Pico.video.pending) {
CommandChange();
Pico.video.pending = 0;
struct PicoVideo *pv = &Pico.video;
u8 d = VideoSr(pv) >> 8;
if (pv->pending) {
CommandChange(pv);
pv->pending = 0;
}
elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);
return d;
@ -964,10 +968,11 @@ unsigned char PicoVideoRead8CtlH(void)
unsigned char PicoVideoRead8CtlL(void)
{
u8 d = VideoSr(&Pico.video);
if (Pico.video.pending) {
CommandChange();
Pico.video.pending = 0;
struct PicoVideo *pv = &Pico.video;
u8 d = VideoSr(pv);
if (pv->pending) {
CommandChange(pv);
pv->pending = 0;
}
elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);
return d;