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just some debug code to blank out data we've read from in a spare copy of the graphic rom region, although it already confirms what I thought, every byte of graphic data is transferred at some point if you test all characters, so no hidden tables lurking there.

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This commit is contained in:
David Haywood 2013-03-08 01:17:35 +00:00
parent 1333fbeafc
commit ee1609e745
1 changed files with 16 additions and 4 deletions
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20
src/mame/drivers/gunpey.c
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@ -227,6 +227,8 @@ public:
UINT16 m_vreg_addr;
UINT8* m_blit_rom;
UINT8* m_blit_rom2;
UINT8* m_vram;
// work variables for the decompression
@ -243,6 +245,7 @@ public:
int m_dstxbase;
int m_dstxcount;
int m_dstycount;
bool m_out_of_data;
int m_latched_bits_left;
UINT8 m_latched_byte;
@ -641,6 +644,7 @@ void gunpey_state::get_stream_next_byte(void)
{
// check if we need to move on to the next row of the source bitmap
// to get the data requested
if (m_scrxcount==m_sourcewide)
{
m_scrxcount = 0;
@ -649,6 +653,8 @@ void gunpey_state::get_stream_next_byte(void)
}
m_latched_byte = m_blit_rom[(((m_srcy)&0x7ff)*0x800)+((m_srcx)&0x7ff)];
if (!m_out_of_data) m_blit_rom2[(((m_srcy)&0x7ff)*0x800)+((m_srcx)&0x7ff)] = 0x77; // debug
m_latched_bits_left = 8;
// increase counters
@ -1054,7 +1060,7 @@ WRITE8_MEMBER(gunpey_state::gunpey_blitter_w)
m_latched_bits_left = 0;
m_zero_bit_count = 0;
bool out_of_data = false;
m_out_of_data = false;
for (;;)
{
@ -1084,12 +1090,12 @@ WRITE8_MEMBER(gunpey_state::gunpey_blitter_w)
// hack, really I imagine there is exactly enough compressed data to fill the dest bitmap area when decompressed, but to stop us
// overrunning into reading other data we terminate on a 0000, which doesn't seem likely to be compressed data.
if (m_zero_bit_count>=16)
out_of_data = true;
m_out_of_data = true;
UINT8 usedata = 0xff;
if (!out_of_data)
if (!m_out_of_data)
{
#ifdef SHOW_COMPRESSED_DATA_DEBUG
//if (count<512)
@ -1158,7 +1164,7 @@ WRITE8_MEMBER(gunpey_state::gunpey_blitter_w)
for (;;)
{
UINT8 usedata = m_blit_rom[(((m_srcy)&0x7ff)*0x800)+((m_srcx)&0x7ff)];
m_blit_rom2[(((m_srcy)&0x7ff)*0x800)+((m_srcx)&0x7ff)] = 0x44; // debug
m_srcx++; m_scrxcount++;
if (m_scrxcount==m_xsize)
{
@ -1377,6 +1383,7 @@ static GFXLAYOUT_RAW( gunpey, 2048, 1, 2048*8, 2048*8 )
static GFXDECODE_START( gunpey )
GFXDECODE_ENTRY( "blit_data", 0, gunpey, 0x0000, 0x1 )
GFXDECODE_ENTRY( "blit_data2", 0, gunpey, 0x0000, 0x1 )
GFXDECODE_ENTRY( "vram", 0, gunpey, 0x0000, 0x1 )
GFXDECODE_END
@ -1421,6 +1428,9 @@ ROM_START( gunpey )
ROM_REGION( 0x400000, "blit_data", 0 )
ROM_LOAD( "gp_rom3.025", 0x00000, 0x400000, CRC(f2d1f9f0) SHA1(0d20301fd33892074508b9d127456eae80cc3a1c) )
ROM_REGION( 0x400000, "blit_data2", 0 ) // debug test
ROM_COPY( "blit_data", 0x00000, 0x00000, 0x400000 )
ROM_REGION( 0x400000, "vram", ROMREGION_ERASEFF )
@ -1437,6 +1447,8 @@ DRIVER_INIT_MEMBER(gunpey_state,gunpey)
{
m_blit_rom = memregion("blit_data")->base();
m_blit_rom2 = memregion("blit_data2")->base();
m_vram = memregion("vram")->base();
// ...
}