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add galaxia bg scroll (see level 1 enemy swarm)

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This commit is contained in:
Michaël Banaan Ananas 2012-03-23 12:54:38 +00:00
parent 6089e8e372
commit cdd9a4be2c
1 changed files with 22 additions and 14 deletions
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36
src/mame/drivers/galaxia.c
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@ -17,12 +17,13 @@ do contain Galaxian-like graphics...
---
TS 2008.08.12:
- fixed rom loading
- added preliminary video emulation
HW seems to have many similarities with quasar.c / cvs.c
TODO:
- galaxia level 2 collision detection
- astrowar I/O
- eventually merge/share with quasar.c or cvs.c?
*/
#include "emu.h"
@ -38,6 +39,7 @@ public:
: driver_device(mconfig, type, tag) { }
UINT8 m_collision;
UINT8 m_scroll;
UINT8 *m_video;
UINT8 *m_color;
};
@ -47,21 +49,24 @@ public:
static SCREEN_UPDATE_IND16( galaxia )
{
galaxia_state *state = screen.machine().driver_data<galaxia_state>();
int x,y, count;
int x, y;
device_t *s2636_0 = screen.machine().device("s2636_0");
device_t *s2636_1 = screen.machine().device("s2636_1");
device_t *s2636_2 = screen.machine().device("s2636_2");
count = 0;
for (y=0;y<256/8;y++)
// draw background
for (x = 0; x < 32; x++)
{
for (x=0;x<256/8;x++)
// fixed scrolling area
int y_offs = 0;
if (x >= 4 && x < 24)
y_offs = 0xff - state->m_scroll;
for (y = 0; y < 32; y++)
{
int tile = state->m_video[count];
drawgfx_opaque(bitmap,cliprect,screen.machine().gfx[0],tile,0,0,0,x*8,y*8);
count++;
int tile = state->m_video[y << 5 | x];
drawgfx_opaque(bitmap,cliprect,screen.machine().gfx[0],tile,0,0,0,x*8,(y_offs+y*8)&0xff);
}
}
@ -111,6 +116,7 @@ static SCREEN_UPDATE_IND16( galaxia )
static WRITE8_HANDLER(galaxia_video_w)
{
galaxia_state *state = space->machine().driver_data<galaxia_state>();
space->machine().primary_screen->update_partial(space->machine().primary_screen->vpos());
if (cpu_get_reg(&space->device(), S2650_FO))
{
state->m_video[offset]=data;
@ -129,7 +135,9 @@ static READ8_HANDLER(galaxia_video_r)
static WRITE8_HANDLER(galaxia_scroll_w)
{
// TODO: scroll bg enemy swarm
galaxia_state *state = space->machine().driver_data<galaxia_state>();
space->machine().primary_screen->update_partial(space->machine().primary_screen->vpos());
state->m_scroll = data;
}
static READ8_HANDLER(galaxia_collision_r)
@ -316,7 +324,7 @@ static MACHINE_CONFIG_START( galaxia, galaxia_state )
MCFG_SCREEN_REFRESH_RATE(60)
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
MCFG_SCREEN_SIZE(256, 256)
MCFG_SCREEN_VISIBLE_AREA(0, 256-1, 0, 256-1)
MCFG_SCREEN_VISIBLE_AREA(0*8, 30*8-1, 2*8, 32*8-1)
MCFG_SCREEN_UPDATE_STATIC(galaxia)
MCFG_GFXDECODE(galaxia)