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the first byte of the compressed data is the width of the compressed data stream in the texture page.

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This commit is contained in:
David Haywood 2013-03-02 16:54:44 +00:00
parent ab63507bf5
commit ddfaa34f69
1 changed files with 60 additions and 7 deletions
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67
src/mame/drivers/gunpey.c
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@ -208,6 +208,8 @@ public:
DECLARE_READ8_MEMBER(gunpey_status_r);
DECLARE_READ8_MEMBER(gunpey_inputs_r);
DECLARE_WRITE8_MEMBER(gunpey_blitter_w);
DECLARE_WRITE8_MEMBER(gunpey_blitter_upper_w);
DECLARE_WRITE8_MEMBER(gunpey_blitter_upper2_w);
DECLARE_WRITE8_MEMBER(gunpey_output_w);
DECLARE_WRITE16_MEMBER(gunpey_vram_bank_w);
DECLARE_WRITE16_MEMBER(gunpey_vregs_addr_w);
@ -563,6 +565,8 @@ TIMER_CALLBACK_MEMBER(gunpey_state::blitter_end)
gunpey_irq_check(4);
}
#define SHOW_COMPRESSED_DATA_DEBUG
WRITE8_MEMBER(gunpey_state::gunpey_blitter_w)
{
// UINT16 *blit_buffer = m_blit_buffer;
@ -608,18 +612,55 @@ WRITE8_MEMBER(gunpey_state::gunpey_blitter_w)
dstx<<=1;
xsize<<=1;
//int color = space.machine().rand()&0x1f;
if(rle)
{
if(rle == 8)
{
// compressed stream format:
//
// byte 0 = source width (data is often stored in fairly narrow columns)
#ifdef SHOW_COMPRESSED_DATA_DEBUG
printf("%02x %02x %02x %02x|%02x %02x %02x %02x|%02x %02x %02x %02x|%02x %02x %02x %02x\n"
,blit_ram[0],blit_ram[1],blit_ram[2],blit_ram[3]
,blit_ram[4],blit_ram[5],blit_ram[6],blit_ram[7]
,blit_ram[8],blit_ram[9],blit_ram[0xa],blit_ram[0xb]
,blit_ram[0xc],blit_ram[0xd],blit_ram[0xe],blit_ram[0xf]);
int count = 0;
printf("data: ");
#endif
UINT8 sourcewide = blit_rom[(((srcy)&0x7ff)*0x800)+((srcx)&0x7ff)];
for (int y=0;y<ysize;y++)
{
for (int x=0;x<xsize;x++)
{
//blit_rom[(((srcy+y)&0x7ff)*0x800)+((srcx+x)&0x7ff)];
vram[(((dsty+y)&0x7ff)*0x800)+((dstx+x)&0x7ff)] = 0;
UINT8 dat = blit_rom[(((srcy+y)&0x7ff)*0x800)+((srcx+x)&0x7ff)];
// test.. (it's correct)
if (x>sourcewide) dat = 0;
vram[(((dsty+y)&0x7ff)*0x800)+((dstx+x)&0x7ff)] = dat;
#ifdef SHOW_COMPRESSED_DATA_DEBUG
if (count<8)
{
count++;
printf("%02x", dat);
}
#endif
}
}
#ifdef SHOW_COMPRESSED_DATA_DEBUG
printf("\n");
#endif
}
else
printf("unknown RLE mode %02x\n",rle);
@ -639,15 +680,24 @@ WRITE8_MEMBER(gunpey_state::gunpey_blitter_w)
/*
printf("%02x %02x %02x %02x|%02x %02x %02x %02x|%02x %02x %02x %02x|%02x %02x %02x %02x\n"
,blit_ram[0],blit_ram[1],blit_ram[2],blit_ram[3]
,blit_ram[4],blit_ram[5],blit_ram[6],blit_ram[7]
,blit_ram[8],blit_ram[9],blit_ram[0xa],blit_ram[0xb]
,blit_ram[0xc],blit_ram[0xd],blit_ram[0xe],blit_ram[0xf]);
*/
}
}
WRITE8_MEMBER(gunpey_state::gunpey_blitter_upper_w)
{
//printf("gunpey_blitter_upper_w %02x %02x\n", offset, data);
}
WRITE8_MEMBER(gunpey_state::gunpey_blitter_upper2_w)
{
//printf("gunpey_blitter_upper2_w %02x %02x\n", offset, data);
}
WRITE8_MEMBER(gunpey_state::gunpey_output_w)
{
//bit 0 is coin counter
@ -685,6 +735,9 @@ static ADDRESS_MAP_START( io_map, AS_IO, 16, gunpey_state )
AM_RANGE(0x7fc8, 0x7fc9) AM_READWRITE8(gunpey_status_r, gunpey_status_w, 0xffff )
AM_RANGE(0x7fd0, 0x7fdf) AM_WRITE8(gunpey_blitter_w, 0xffff )
AM_RANGE(0x7fe0, 0x7fe5) AM_WRITE8(gunpey_blitter_upper_w, 0xffff )
AM_RANGE(0x7ff0, 0x7ff5) AM_WRITE8(gunpey_blitter_upper2_w, 0xffff )
//AM_RANGE(0x7FF0, 0x7FF1) AM_RAM
AM_RANGE(0x7fec, 0x7fed) AM_WRITE(gunpey_vregs_addr_w)
AM_RANGE(0x7fee, 0x7fef) AM_WRITE(gunpey_vram_bank_w)