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Idea for DMD drawing function (no whatsnew)

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This commit is contained in:
Miodrag Milanovic 2011-09-28 14:34:24 +00:00
parent 0ce41d3fbd
commit 9dc17c29de
1 changed files with 47 additions and 13 deletions
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60
src/mame/drivers/whitestar.c
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@ -186,6 +186,45 @@ static INTERRUPT_GEN( whitestar_firq_interrupt )
device_set_input_line(device, M6809_FIRQ_LINE, HOLD_LINE);
}
#define DMD_CHUNK_SIZE 10
#define MCFG_DMD_ADD(_tag, _width, _height) \
MCFG_DEVICE_ADD(_tag, SCREEN, 0) \
MCFG_SCREEN_TYPE(LCD) \
MCFG_SCREEN_REFRESH_RATE(60) \
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) \
MCFG_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16) \
MCFG_SCREEN_SIZE( _width * DMD_CHUNK_SIZE, _height *DMD_CHUNK_SIZE) \
MCFG_SCREEN_VISIBLE_AREA( 0, _width * DMD_CHUNK_SIZE-1, 0, _height*DMD_CHUNK_SIZE-1 ) \
MCFG_DEFAULT_LAYOUT( layout_lcd )
void dmd_put_pixel(bitmap_t *bitmap, int x, int y, int color)
{
int midx = x * DMD_CHUNK_SIZE + DMD_CHUNK_SIZE/2;
int midy = y * DMD_CHUNK_SIZE + DMD_CHUNK_SIZE/2;
int width = DMD_CHUNK_SIZE-2;
// compute parameters
width /= 2;
float ooradius2 = 1.0f / (float)(width * width);
// iterate over y
for (UINT32 y = 0; y <= width; y++)
{
UINT16 *d0 = BITMAP_ADDR16(bitmap, midy - y, 0);
UINT16 *d1 = BITMAP_ADDR16(bitmap, midy + y, 0);
float xval = width * sqrt(1.0f - (float)(y * y) * ooradius2);
INT32 left, right;
// compute left/right coordinates
left = midx - (INT32)(xval + 0.5f);
right = midx + (INT32)(xval + 0.5f);
// draw this scanline
for (UINT32 x = left; x < right; x++)
d0[x] = d1[x] = color + 1;
}
}
MC6845_UPDATE_ROW( whitestar_update_row )
{
whitestar_state *state = device->machine().driver_data<whitestar_state>();
@ -198,7 +237,7 @@ MC6845_UPDATE_ROW( whitestar_update_row )
val = BITSWAP16(val,15,7,14,6,13,5,12,4,11,3,10,2,9,1,8,0);
for(xi=0;xi<8;xi++)
*BITMAP_ADDR16(bitmap, ra, x*8 + xi) = (val>>(14-xi*2)) & 0x03;
dmd_put_pixel(bitmap, (x*8 + xi), ra, (val>>(14-xi*2)) & 0x03);
}
}
@ -219,9 +258,11 @@ static const mc6845_interface whitestar_crtc6845_interface =
static PALETTE_INIT( whitestar )
{
palette_set_color(machine, 0, MAKE_RGB(0, 0, 0));
palette_set_color(machine, 1, MAKE_RGB(84, 73, 10));
palette_set_color(machine, 2, MAKE_RGB(168, 147, 21));
palette_set_color(machine, 3, MAKE_RGB(255, 224, 32));
palette_set_color(machine, 1, MAKE_RGB(20, 20, 20));
palette_set_color(machine, 2, MAKE_RGB(84, 73, 10));
palette_set_color(machine, 3, MAKE_RGB(168, 147, 21));
palette_set_color(machine, 4, MAKE_RGB(255, 224, 32));
}
bool whitestar_state::screen_update(screen_device &screen, bitmap_t &bitmap, const rectangle &cliprect)
@ -248,16 +289,9 @@ static MACHINE_CONFIG_START( whitestar, whitestar_state )
MCFG_MC6845_ADD("mc6845", MC6845, 2000000, whitestar_crtc6845_interface)
/* video hardware */
MCFG_SCREEN_ADD("screen", LCD)
MCFG_SCREEN_REFRESH_RATE(60)
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
MCFG_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
MCFG_SCREEN_SIZE( 128, 32 )
MCFG_SCREEN_VISIBLE_AREA( 0, 128-1, 0, 32-1 )
MCFG_DMD_ADD("screen", 128, 32)
MCFG_DEFAULT_LAYOUT( layout_lcd )
MCFG_PALETTE_LENGTH(4)
MCFG_PALETTE_LENGTH(5)
MCFG_PALETTE_INIT(whitestar)
MACHINE_CONFIG_END