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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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30
Pico/PicoFrameHints.c
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@ -35,10 +35,10 @@
static int PicoFrameHints(void)
{
struct PicoVideo *pv=&Pico.video;
int lines, y, lines_vis = 224, line_sample, skip;
int lines, y, lines_vis = 224, line_sample, skip, vcnt_wrap;
int hint; // Hint counter
Pico.m.scanline = 0;
pv->v_counter = Pico.m.scanline = 0;
if ((PicoOpt&POPT_ALT_RENDERER) && !PicoSkipFrame && (pv->reg[1]&0x40)) { // fast rend., display enabled
// draw a frame just after vblank in alternative render mode
@ -53,7 +53,7 @@ static int PicoFrameHints(void)
if (Pico.m.pal) {
line_sample = 68;
if(pv->reg[1]&8) lines_vis = 240;
if (pv->reg[1]&8) lines_vis = 240;
} else {
line_sample = 93;
}
@ -75,7 +75,12 @@ static int PicoFrameHints(void)
for (y = 0; y < lines_vis; y++)
{
Pico.m.scanline = y;
pv->v_counter = Pico.m.scanline = y;
if ((pv->reg[12]&6) == 6) { // interlace mode 2
pv->v_counter <<= 1;
pv->v_counter |= pv->v_counter >> 8;
pv->v_counter &= 0xff;
}
// VDP FIFO
pv->lwrite_cnt -= 12;
@ -138,6 +143,11 @@ static int PicoFrameHints(void)
#endif
}
// V-int line (224 or 240)
Pico.m.scanline = y;
pv->v_counter = 0xe0; // bad for 240 mode
if ((pv->reg[12]&6) == 6) pv->v_counter = 0xc1;
if (!skip)
{
if (DrawScanline < y)
@ -147,9 +157,6 @@ static int PicoFrameHints(void)
#endif
}
// V-int line (224 or 240)
Pico.m.scanline = y;
// VDP FIFO
pv->lwrite_cnt=0;
Pico.video.status|=0x200;
@ -168,7 +175,6 @@ static int PicoFrameHints(void)
if (pv->reg[0]&0x10) SekInterrupt(4);
}
// V-Interrupt:
pv->status|=0x08; // go into vblank
pv->pending_ints|=0x20;
@ -212,10 +218,16 @@ static int PicoFrameHints(void)
// PAL line count might actually be 313 according to Steve Snake, but that would complicate things.
lines = Pico.m.pal ? 312 : 262;
vcnt_wrap = Pico.m.pal ? 0x103 : 0xEB; // based on Gens
for (y++; y < lines; y++)
{
Pico.m.scanline = y;
pv->v_counter = Pico.m.scanline = y;
if (y >= vcnt_wrap)
pv->v_counter -= Pico.m.pal ? 56 : 6;
if ((pv->reg[12]&6) == 6)
pv->v_counter = (pv->v_counter << 1) | 1;
pv->v_counter &= 0xff;
PAD_DELAY
#ifdef PICO_CD