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(MESS) Minor fix to the character tile row ordering in apc [Lord Nightmare]

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This commit is contained in:
Jonathan Gevaryahu 2012-11-20 19:58:56 +00:00
parent e1d32009ad
commit 8a1f60fcfd
1 changed files with 19 additions and 2 deletions
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21
src/mess/drivers/apc.c
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@ -185,7 +185,7 @@ static UPD7220_DISPLAY_PIXELS( hgdc_display_pixels )
static UPD7220_DRAW_TEXT_LINE( hgdc_draw_text )
{
apc_state *state = device->machine().driver_data<apc_state>();
int xi,yi;
int xi,yi,yi_trans;
int x;
UINT8 char_size;
// UINT8 interlace_on;
@ -220,6 +220,7 @@ static UPD7220_DRAW_TEXT_LINE( hgdc_draw_text )
for(yi=0;yi<lr;yi++)
{
yi_trans = (yi==0)?lr-1:yi-1;
for(xi=0;xi<8;xi++)
{
int res_x,res_y;
@ -232,7 +233,23 @@ static UPD7220_DRAW_TEXT_LINE( hgdc_draw_text )
continue;
// tile_data = secret ? 0 : (state->m_char_rom[tile*char_size+interlace_on*0x800+yi]);
tile_data = (state->m_char_rom[(tile & 0x7f)+((tile & 0x80)<<4)+((yi & 0xf)*0x80)+((yi & 0x10)<<8)]);
/*
Addr bus: C BA98 7654 3210
| |||| |\\\ \\\\- character number bits 0-6
| |||| \--------- y' bit 0
| |||\----------- y' bit 1
| ||\------------ y' bit 2
| |\------------- y' bit 3
| \-------------- character number bit 7
\---------------- y' bit 4
y to y' (assumed; this needs hardware tests since there could be one more 'blank' line between all char rows):
y = 0 1 2 3 ... 16 17 18
y' = 18 0 1 2 ... 15 16 17
Data bus: 76543210 = pixels, in left->01234567->right order
*/
tile_data = (state->m_char_rom[(tile & 0x7f)+((tile & 0x80)<<4)+((yi_trans & 0xf)*0x80)+((yi_trans & 0x10)<<8)]);
if(reverse) { tile_data^=0xff; }
if(u_line && yi == lr-1) { tile_data = 0xff; }