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author Michaël Banaan Ananas <happppp@users.noreply.github.com>2012-03-23 21:17:28 +0000
committer Michaël Banaan Ananas <happppp@users.noreply.github.com>2012-03-23 21:17:28 +0000
commit2bd232bfd4a0fb112da46fae67e65159d27ebb7e (patch)
treeaca55af4eaa94e5cd15f26b654b8ee2b08b1d01c
parenta0dfd5f6cb18d29c8b90457f0f0334386f0e58fc (diff)
some cleanup+notes and added preliminary bullet hw
-rw-r--r--src/mame/drivers/galaxia.c107
1 files changed, 65 insertions, 42 deletions
diff --git a/src/mame/drivers/galaxia.c b/src/mame/drivers/galaxia.c
index ce81c628a54..7b48fb02801 100644
--- a/src/mame/drivers/galaxia.c
+++ b/src/mame/drivers/galaxia.c
@@ -7,21 +7,26 @@ Taken from an untested board.
1K byte files were 2708 or equivalent.
512 byte file is the 82S130 colour PROM.
-This is not a direct pirate of Galaxians as you might think from the name.
-The game uses a Signetics 2650A CPU with three 40-pin 2636 chips. I have
-no idea what 2636's are but I am hoping they are something to do with the
-sound since the board has no apparent sound circuitry. The video hardware
-looks like it's similar to Galaxians (2 x 2114, 2 x 2101, 2 x EPROM) but
-there is no attack RAM and the graphics EPROMS are 2708. The graphics EPROMS
-do contain Galaxian-like graphics...
+This is not a direct pirate of Galaxian as you might think from the name.
+The game uses a Signetics 2650A CPU with three 40-pin 2636 chips, which are
+responsible for sound and some video functions.
+
+Other than that, the video hardware looks like it's similar to Galaxian
+(2 x 2114, 2 x 2101, 2 x EPROM) but there is no attack RAM and the graphics
+EPROMS are 2708. The graphics EPROMS do contain Galaxian-like graphics...
+
+Astro Wars (port of Astro Fighter) is on a stripped down board of Galaxia,
+using only one 2636 chip.
---
HW seems to have many similarities with quasar.c / cvs.c
TODO:
-- galaxia level 2 collision detection
+- better collision detection
+- colors are probably wrong
- astrowar I/O
+- starfield hardware?
- eventually merge/share with quasar.c or cvs.c?
*/
@@ -41,11 +46,11 @@ public:
UINT8 m_collision;
UINT8 m_scroll;
UINT8 *m_video;
+ UINT8 *m_bullet;
UINT8 *m_color;
};
-
static SCREEN_UPDATE_IND16( galaxia )
{
galaxia_state *state = screen.machine().driver_data<galaxia_state>();
@@ -55,18 +60,41 @@ static SCREEN_UPDATE_IND16( galaxia )
device_t *s2636_1 = screen.machine().device("s2636_1");
device_t *s2636_2 = screen.machine().device("s2636_2");
+ bitmap.fill(0, cliprect);
+
// draw background
for (x = 0; x < 32; x++)
{
// fixed scrolling area
int y_offs = 0;
if (x >= 4 && x < 24)
- y_offs = 0xff - state->m_scroll;
+ y_offs = state->m_scroll ^ 0xff;
for (y = 0; y < 32; y++)
{
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);
+ int color = state->m_color[y << 5 | x];
+ drawgfx_transpen(bitmap,cliprect,screen.machine().gfx[0], tile, color, 0, 0, x*8, (y_offs + y*8) & 0xff, 0);
+ }
+ }
+
+ // draw bullets (guesswork)
+ for (y = cliprect.min_y; y <= cliprect.max_y; y++)
+ {
+ if (state->m_bullet[y])
+ {
+ int pos = state->m_bullet[y] ^ 0xff;
+ if (bitmap.pix16(y, pos))
+ {
+ // collision with background
+// state->m_collision |= 0xff; * no effect, even if setting all bits.. must be another register?
+ }
+ else
+ {
+ // bullet size and color is guessed
+ bitmap.pix16(y, pos) = 7;
+ bitmap.pix16(y, pos + 1) = 7;
+ }
}
}
@@ -75,48 +103,43 @@ static SCREEN_UPDATE_IND16( galaxia )
bitmap_ind16 &s2636_2_bitmap = s2636_update(s2636_2, cliprect);
/* copy the S2636 images into the main bitmap and check collision */
+ for (y = cliprect.min_y; y <= cliprect.max_y; y++)
{
- int y;
-
- for (y = cliprect.min_y; y <= cliprect.max_y; y++)
+ for (x = cliprect.min_x; x <= cliprect.max_x; x++)
{
- int x;
-
- for (x = cliprect.min_x; x <= cliprect.max_x; x++)
+ int pixel0 = s2636_0_bitmap.pix16(y, x);
+ int pixel1 = s2636_1_bitmap.pix16(y, x);
+ int pixel2 = s2636_2_bitmap.pix16(y, x);
+
+ int pixel = pixel0 | pixel1 | pixel2;
+
+ if (S2636_IS_PIXEL_DRAWN(pixel))
{
- int pixel0 = s2636_0_bitmap.pix16(y, x);
- int pixel1 = s2636_1_bitmap.pix16(y, x);
- int pixel2 = s2636_2_bitmap.pix16(y, x);
-
- int pixel = pixel0 | pixel1 | pixel2;
-
- if (S2636_IS_PIXEL_DRAWN(pixel))
+ /* S2636 vs. S2636 collision detection */
+ if (S2636_IS_PIXEL_DRAWN(pixel0) && S2636_IS_PIXEL_DRAWN(pixel1)) state->m_collision |= 0x01;
+ if (S2636_IS_PIXEL_DRAWN(pixel1) && S2636_IS_PIXEL_DRAWN(pixel2)) state->m_collision |= 0x02;
+ if (S2636_IS_PIXEL_DRAWN(pixel2) && S2636_IS_PIXEL_DRAWN(pixel0)) state->m_collision |= 0x04;
+
+ /* S2636 vs. background collision detection */
+ if (bitmap.pix16(y, x))
{
- /* S2636 vs. S2636 collision detection */
- if (S2636_IS_PIXEL_DRAWN(pixel0) && S2636_IS_PIXEL_DRAWN(pixel1)) state->m_collision |= 0x01;
- if (S2636_IS_PIXEL_DRAWN(pixel1) && S2636_IS_PIXEL_DRAWN(pixel2)) state->m_collision |= 0x02;
- if (S2636_IS_PIXEL_DRAWN(pixel2) && S2636_IS_PIXEL_DRAWN(pixel0)) state->m_collision |= 0x04;
-
- /* S2636 vs. background collision detection */
- if (bitmap.pix16(y, x))
- {
- if (S2636_IS_PIXEL_DRAWN(pixel0)) state->m_collision |= 0x10;
- if (S2636_IS_PIXEL_DRAWN(pixel1)) state->m_collision |= 0x20;
- if (S2636_IS_PIXEL_DRAWN(pixel2)) state->m_collision |= 0x40;
- }
-
- bitmap.pix16(y, x) = S2636_PIXEL_COLOR(pixel);
+// if (S2636_IS_PIXEL_DRAWN(pixel0)) state->m_collision |= 0x10; * problem in level 2
+ if (S2636_IS_PIXEL_DRAWN(pixel1)) state->m_collision |= 0x20;
+ if (S2636_IS_PIXEL_DRAWN(pixel2)) state->m_collision |= 0x40;
}
+
+ bitmap.pix16(y, x) = S2636_PIXEL_COLOR(pixel);
}
}
}
+
return 0;
}
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());
+// space->machine().primary_screen->update_partial(space->machine().primary_screen->vpos());
if (cpu_get_reg(&space->device(), S2650_FO))
{
state->m_video[offset]=data;
@@ -157,11 +180,11 @@ static READ8_HANDLER(galaxia_collision_clear)
static ADDRESS_MAP_START( mem_map, AS_PROGRAM, 8 )
AM_RANGE(0x0000, 0x13ff) AM_ROM
- AM_RANGE(0x1400, 0x14ff) AM_MIRROR(0x6000) AM_RAM // bullet ram?
+ AM_RANGE(0x1400, 0x14ff) AM_MIRROR(0x6000) AM_RAM AM_BASE_MEMBER(galaxia_state, m_bullet)
AM_RANGE(0x1500, 0x15ff) AM_MIRROR(0x6000) AM_DEVREADWRITE("s2636_0", s2636_work_ram_r, s2636_work_ram_w)
AM_RANGE(0x1600, 0x16ff) AM_MIRROR(0x6000) AM_DEVREADWRITE("s2636_1", s2636_work_ram_r, s2636_work_ram_w)
AM_RANGE(0x1700, 0x17ff) AM_MIRROR(0x6000) AM_DEVREADWRITE("s2636_2", s2636_work_ram_r, s2636_work_ram_w)
- AM_RANGE(0x1800, 0x1bff) AM_MIRROR(0x6000) AM_READWRITE(galaxia_video_r, galaxia_video_w) AM_BASE_MEMBER(galaxia_state, m_video)
+ AM_RANGE(0x1800, 0x1bff) AM_MIRROR(0x6000) AM_READWRITE(galaxia_video_r, galaxia_video_w) AM_BASE_MEMBER(galaxia_state, m_video)
AM_RANGE(0x1c00, 0x1fff) AM_MIRROR(0x6000) AM_RAM
AM_RANGE(0x2000, 0x33ff) AM_ROM
AM_RANGE(0x7214, 0x7214) AM_READ_PORT("IN0")
@@ -174,7 +197,7 @@ static ADDRESS_MAP_START( io_map, AS_IO, 8 )
AM_RANGE(0x06, 0x06) AM_READ_PORT("IN6")
AM_RANGE(0xac, 0xac) AM_READ_PORT("IN3")
AM_RANGE(S2650_CTRL_PORT, S2650_CTRL_PORT) AM_READ(galaxia_collision_r)
- AM_RANGE(S2650_DATA_PORT, S2650_DATA_PORT) AM_READ(galaxia_collision_clear) // ?
+ AM_RANGE(S2650_DATA_PORT, S2650_DATA_PORT) AM_READ(galaxia_collision_clear)
AM_RANGE(S2650_SENSE_PORT, S2650_SENSE_PORT) AM_READ_PORT("SENSE")
ADDRESS_MAP_END