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small cleanup + trying to figure out videocontrol reg, this update makes some screen transitions look better (especially nbbatman)

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This commit is contained in:
Michaël Banaan Ananas 2011-10-20 20:48:49 +00:00
parent 5f610a0321
commit cbdb145968
2 changed files with 35 additions and 16 deletions
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1
src/mame/includes/m92.h
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@ -23,6 +23,7 @@ public:
UINT8 m_irq_vectorbase;
UINT32 m_raster_irq_position;
UINT16 *m_vram_data;
UINT16 m_videocontrol;
UINT16 *m_spritecontrol;
UINT8 m_sprite_buffer_busy;
UINT8 m_game_kludge;

50
src/mame/video/m92.c
View File

@ -73,13 +73,12 @@ WRITE16_HANDLER( m92_spritecontrol_w )
/* Sprite buffer - the data written doesn't matter (confirmed by several games) */
if (offset==4)
{
buffer_spriteram16_w(space,0,0,0xffff);
buffer_spriteram16_w(space,0,0,0xffff);
state->m_sprite_buffer_busy = 0;
/* Pixel clock is 26.6666 MHz, we have 0x800 bytes, or 0x400 words
to copy from spriteram to the buffer. It seems safe to assume 1
word can be copied per clock.*/
space->machine().scheduler().timer_set(attotime::from_hz(26666000) * 0x400, FUNC(spritebuffer_callback));
/* Pixel clock is 26.6666MHz (some boards 27MHz??), we have 0x800 bytes, or 0x400 words to copy from
spriteram to the buffer. It seems safe to assume 1 word can be copied per clock. */
space->machine().scheduler().timer_set(attotime::from_hz(XTAL_26_66666MHz) * 0x400, FUNC(spritebuffer_callback));
}
// logerror("%04x: m92_spritecontrol_w %08x %08x\n",cpu_get_pc(&space->device()),offset,data);
}
@ -87,6 +86,7 @@ WRITE16_HANDLER( m92_spritecontrol_w )
WRITE16_HANDLER( m92_videocontrol_w )
{
m92_state *state = space->machine().driver_data<m92_state>();
COMBINE_DATA(&state->m_videocontrol);
/*
Many games write:
0x2000
@ -100,11 +100,24 @@ WRITE16_HANDLER( m92_videocontrol_w )
be a different motherboard revision (most games use M92-A-B top
pcb, a M92-A-A revision could exist...).
*/
if (ACCESSING_BITS_0_7)
{
/* Access to upper palette bank */
state->m_palette_bank = (data >> 1) & 1;
}
/*
fedc ba98 7654 3210
.x.. x... .xx. .... always 0?
x... .... .... .... disable tiles
..xx .... .... .... ? only written at POST - otherwise always 2
.... .xxx .... .... ? only written at POST - otherwise always 0
.... .... x... .... disable sprites
.... .... ...x .... ?
.... .... .... x... ?
.... .... .... .x.. ? maybe more palette banks?
.... .... .... ..x. palette bank
.... .... .... ...x ?
*/
/* Access to upper palette bank */
state->m_palette_bank = (state->m_videocontrol >> 1) & 1;
// logerror("%04x: m92_videocontrol_w %d = %02x\n",cpu_get_pc(&space->device()),offset,data);
}
@ -276,6 +289,7 @@ VIDEO_START( m92 )
state->save_item(NAME(state->m_pf_master_control));
state->save_item(NAME(state->m_videocontrol));
state->save_item(NAME(state->m_sprite_list));
state->save_item(NAME(state->m_raster_irq_position));
state->save_item(NAME(state->m_sprite_buffer_busy));
@ -310,6 +324,7 @@ VIDEO_START( ppan )
static void draw_sprites(running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect)
{
m92_state *state = machine.driver_data<m92_state>();
if (state->m_videocontrol & 0x0080) return;
UINT16 *buffered_spriteram16 = machine.generic.buffered_spriteram.u16;
int offs,k;
@ -395,6 +410,7 @@ static void draw_sprites(running_machine &machine, bitmap_t *bitmap, const recta
static void ppan_draw_sprites(running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect)
{
m92_state *state = machine.driver_data<m92_state>();
if (state->m_videocontrol & 0x0080) return;
UINT16 *buffered_spriteram16 = machine.generic.buffered_spriteram.u16;
int offs,k;
@ -529,10 +545,10 @@ static void m92_update_scroll_positions(running_machine &machine)
/*****************************************************************************/
static void m92_screenrefresh(running_machine &machine, bitmap_t *bitmap,const rectangle *cliprect)
static void m92_draw_tiles(running_machine &machine, bitmap_t *bitmap,const rectangle *cliprect)
{
m92_state *state = machine.driver_data<m92_state>();
bitmap_fill(machine.priority_bitmap, cliprect, 0);
if (state->m_videocontrol & 0x8000) return;
if ((~state->m_pf_master_control[2] >> 4) & 1)
{
@ -541,8 +557,6 @@ static void m92_screenrefresh(running_machine &machine, bitmap_t *bitmap,const r
tilemap_draw(bitmap, cliprect, state->m_pf_layer[2].wide_tmap, TILEMAP_DRAW_LAYER0, 1);
tilemap_draw(bitmap, cliprect, state->m_pf_layer[2].tmap, TILEMAP_DRAW_LAYER0, 1);
}
else
bitmap_fill(bitmap, cliprect, 0);
tilemap_draw(bitmap, cliprect, state->m_pf_layer[1].wide_tmap, TILEMAP_DRAW_LAYER1, 0);
tilemap_draw(bitmap, cliprect, state->m_pf_layer[1].tmap, TILEMAP_DRAW_LAYER1, 0);
@ -558,8 +572,10 @@ static void m92_screenrefresh(running_machine &machine, bitmap_t *bitmap,const r
SCREEN_UPDATE( m92 )
{
bitmap_fill(screen->machine().priority_bitmap, cliprect, 0);
bitmap_fill(bitmap, cliprect, 0);
m92_update_scroll_positions(screen->machine());
m92_screenrefresh(screen->machine(), bitmap, cliprect);
m92_draw_tiles(screen->machine(), bitmap, cliprect);
draw_sprites(screen->machine(), bitmap, cliprect);
@ -573,8 +589,10 @@ SCREEN_UPDATE( m92 )
SCREEN_UPDATE( ppan )
{
bitmap_fill(screen->machine().priority_bitmap, cliprect, 0);
bitmap_fill(bitmap, cliprect, 0);
m92_update_scroll_positions(screen->machine());
m92_screenrefresh(screen->machine(), bitmap, cliprect);
m92_draw_tiles(screen->machine(), bitmap, cliprect);
ppan_draw_sprites(screen->machine(), bitmap, cliprect);