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32x: packed pixel mode (works over 68k)

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@773 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2009-09-12 21:54:46 +00:00
parent be2c420828
commit 974fdb5bfd
15 changed files with 330 additions and 91 deletions
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58
pico/32x/draw.c Normal file
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#include "../pico_int.h"
static void convert_pal555(void)
{
unsigned int *ps = (void *)Pico32xMem->pal;
unsigned int *pd = (void *)Pico32xMem->pal_native;
unsigned int m1 = 0x001f001f;
unsigned int m2 = 0x03e003e0;
unsigned int m3 = 0xfc00fc00;
int i;
// place prio to LS green bit
for (i = 0x100/2; i > 0; i--, ps++, pd++) {
unsigned int t = *ps;
*pd = ((t & m1) << 11) | ((t & m2) << 1) | ((t & m3) >> 10);
}
Pico32x.dirty_pal = 0;
}
void FinalizeLine32xRGB555(int sh, int line)
{
unsigned short *pd = DrawLineDest;
unsigned short *pal = Pico32xMem->pal_native;
unsigned char *pb = HighCol + 8;
unsigned short cram0;
// this is a bit hackish:
// we swap cram color 0 with color that is used for background,
// as bg is forced to 0 when we do 32X
cram0 = Pico.cram[0];
Pico.cram[0] = Pico.cram[Pico.video.reg[7] & 0x3f];
FinalizeLineRGB555(sh, line);
Pico.cram[0] = cram0;
if ((Pico32x.vdp_regs[0] & 3) == 0)
return; // blanking
if (Pico32x.dirty_pal)
convert_pal555();
if ((Pico32x.vdp_regs[0] & P32XV_Mx) == 1) {
unsigned short *dram = (void *)Pico32xMem->dram[Pico32x.vdp_regs[0x0a/2] & P32XV_FS];
unsigned short *ps = dram + dram[line];
unsigned short t;
int i;
for (i = 320/2; i > 0; i--, ps++, pd += 2, pb += 2) {
t = pal[*ps >> 8];
if (pb[0] == 0 || (t & 0x20))
pd[0] = t;
t = pal[*ps & 0xff];
if (pb[1] == 0 || (t & 0x20))
pd[1] = t;
}
}
}