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allow others to access cvs stars hardware

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This commit is contained in:
Michaël Banaan Ananas 2012-03-26 22:32:17 +00:00
parent e1914d74e0
commit 4d9d11daa4
2 changed files with 79 additions and 67 deletions
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4
src/mame/includes/cvs.h
View File

@ -92,7 +92,9 @@ WRITE8_HANDLER( cvs_video_fx_w );
READ8_HANDLER( cvs_collision_r ); READ8_HANDLER( cvs_collision_r );
READ8_HANDLER( cvs_collision_clear ); READ8_HANDLER( cvs_collision_clear );
void cvs_scroll_stars(running_machine &machine); void cvs_init_stars( running_machine &machine );
void cvs_scroll_stars( running_machine &machine );
void cvs_update_stars(running_machine &machine, bitmap_ind16 &bitmap, const rectangle &cliprect, const pen_t star_pen, bool update_always);
PALETTE_INIT( cvs ); PALETTE_INIT( cvs );
SCREEN_UPDATE_IND16( cvs ); SCREEN_UPDATE_IND16( cvs );

142
src/mame/video/cvs.c
View File

@ -15,8 +15,6 @@
#define SPRITE_PEN_BASE (0x820) #define SPRITE_PEN_BASE (0x820)
#define BULLET_STAR_PEN (0x828) #define BULLET_STAR_PEN (0x828)
#define STARS_COLOR_BASE 16
/****************************************************** /******************************************************
* Convert Colour prom to format for Mame Colour Map * * Convert Colour prom to format for Mame Colour Map *
@ -129,44 +127,8 @@ WRITE8_HANDLER( cvs_scroll_w )
VIDEO_START( cvs ) VIDEO_START( cvs )
{ {
cvs_state *state = machine.driver_data<cvs_state>(); cvs_state *state = machine.driver_data<cvs_state>();
int generator = 0;
int y;
/* precalculate the star background */ cvs_init_stars(machine);
state->m_total_stars = 0;
for (y = 255; y >= 0; y--)
{
int x;
for (x = 511; x >= 0; x--)
{
int bit1, bit2;
generator <<= 1;
bit1 = (~generator >> 17) & 1;
bit2 = (generator >> 5) & 1;
if (bit1 ^ bit2)
generator |= 1;
if (((~generator >> 16) & 1) && (generator & 0xfe) == 0xfe)
{
if(((~(generator >> 12)) & 0x01) && ((~(generator >> 13)) & 0x01))
{
if (state->m_total_stars < CVS_MAX_STARS)
{
state->m_stars[state->m_total_stars].x = x;
state->m_stars[state->m_total_stars].y = y;
state->m_stars[state->m_total_stars].code = 1;
state->m_total_stars++;
}
}
}
}
}
/* create helper bitmaps */ /* create helper bitmaps */
machine.primary_screen->register_screen_bitmap(state->m_background_bitmap); machine.primary_screen->register_screen_bitmap(state->m_background_bitmap);
@ -180,13 +142,6 @@ VIDEO_START( cvs )
} }
void cvs_scroll_stars( running_machine &machine )
{
cvs_state *state = machine.driver_data<cvs_state>();
state->m_stars_scroll++;
}
SCREEN_UPDATE_IND16( cvs ) SCREEN_UPDATE_IND16( cvs )
{ {
cvs_state *state = screen.machine().driver_data<cvs_state>(); cvs_state *state = screen.machine().driver_data<cvs_state>();
@ -314,26 +269,81 @@ SCREEN_UPDATE_IND16( cvs )
/* stars circuit */ /* stars circuit */
if (state->m_stars_on) if (state->m_stars_on)
{ cvs_update_stars(screen.machine(), bitmap, cliprect, BULLET_STAR_PEN, 0);
for (offs = 0; offs < state->m_total_stars; offs++)
{
UINT8 x = (state->m_stars[offs].x + state->m_stars_scroll) >> 1;
UINT8 y = state->m_stars[offs].y + ((state->m_stars_scroll + state->m_stars[offs].x) >> 9);
if ((y & 1) ^ ((x >> 4) & 1))
{
if (flip_screen_x_get(screen.machine()))
x = ~x;
if (flip_screen_y_get(screen.machine()))
y = ~y;
if ((y >= cliprect.min_y) && (y <= cliprect.max_y) &&
(colortable_entry_get_value(screen.machine().colortable, bitmap.pix16(y, x)) == 0))
bitmap.pix16(y, x) = BULLET_STAR_PEN;
}
}
}
return 0; return 0;
} }
/* cvs stars hardware */
void cvs_scroll_stars( running_machine &machine )
{
cvs_state *state = machine.driver_data<cvs_state>();
state->m_stars_scroll++;
}
void cvs_init_stars( running_machine &machine )
{
cvs_state *state = machine.driver_data<cvs_state>();
int generator = 0;
int x, y;
/* precalculate the star background */
state->m_total_stars = 0;
for (y = 255; y >= 0; y--)
{
for (x = 511; x >= 0; x--)
{
int bit1, bit2;
generator <<= 1;
bit1 = (~generator >> 17) & 1;
bit2 = (generator >> 5) & 1;
if (bit1 ^ bit2)
generator |= 1;
if (((~generator >> 16) & 1) && (generator & 0xfe) == 0xfe)
{
if(((~(generator >> 12)) & 0x01) && ((~(generator >> 13)) & 0x01))
{
if (state->m_total_stars < CVS_MAX_STARS)
{
state->m_stars[state->m_total_stars].x = x;
state->m_stars[state->m_total_stars].y = y;
state->m_stars[state->m_total_stars].code = 1;
state->m_total_stars++;
}
}
}
}
}
}
void cvs_update_stars(running_machine &machine, bitmap_ind16 &bitmap, const rectangle &cliprect, const pen_t star_pen, bool update_always)
{
cvs_state *state = machine.driver_data<cvs_state>();
for (int offs = 0; offs < state->m_total_stars; offs++)
{
UINT8 x = (state->m_stars[offs].x + state->m_stars_scroll) >> 1;
UINT8 y = state->m_stars[offs].y + ((state->m_stars_scroll + state->m_stars[offs].x) >> 9);
if ((y & 1) ^ ((x >> 4) & 1))
{
if (flip_screen_x_get(machine))
x = ~x;
if (flip_screen_y_get(machine))
y = ~y;
if ((y >= cliprect.min_y) && (y <= cliprect.max_y) &&
(update_always || (colortable_entry_get_value(machine.colortable, bitmap.pix16(y, x)) == 0)))
bitmap.pix16(y, x) = star_pen;
}
}
}