diff options
Diffstat (limited to 'src/mess/video/gamecom.c')
-rw-r--r-- | src/mess/video/gamecom.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/mess/video/gamecom.c b/src/mess/video/gamecom.c new file mode 100644 index 00000000000..ef903c07490 --- /dev/null +++ b/src/mess/video/gamecom.c @@ -0,0 +1,72 @@ + +#include "includes/gamecom.h" + +#define Y_PIXELS 200 + + +static TIMER_CALLBACK( gamecom_scanline ) + { + gamecom_state *state = machine.driver_data<gamecom_state>(); + // draw line + if ( state->m_scanline == 0 ) + state->m_base_address = ( state->m_p_ram[SM8521_LCDC] & 0x40 ) ? 0x2000 : 0x0000; + + if ( ~state->m_p_ram[SM8521_LCDC] & 0x80 ) + { + rectangle rec(0, Y_PIXELS - 1, state->m_scanline, state->m_scanline); + state->m_bitmap.fill(0, rec ); + return; + } + else + { + UINT8 *line = &state->m_p_videoram[ state->m_base_address + 40 * state->m_scanline ]; + int pal[4]; + int i; + + switch( state->m_p_ram[SM8521_LCDC] & 0x30 ) + { + case 0x00: + pal[0] = 4; + pal[1] = 3; + pal[2] = 2; + pal[3] = 0; + break; + case 0x10: + pal[0] = 4; + pal[1] = 3; + pal[2] = 1; + pal[3] = 0; + break; + case 0x20: + pal[0] = 4; + pal[1] = 3; + pal[2] = 1; + pal[3] = 0; + break; + case 0x30: + pal[0] = 4; + pal[1] = 2; + pal[2] = 1; + pal[3] = 0; + break; + } + for( i = 0; i < 40; i++ ) + { + UINT8 p = line[i]; + state->m_bitmap.pix16(i * 4 + 0, state->m_scanline) = pal[ ( p >> 6 ) & 3 ]; + state->m_bitmap.pix16(i * 4 + 1, state->m_scanline) = pal[ ( p >> 4 ) & 3 ]; + state->m_bitmap.pix16(i * 4 + 2, state->m_scanline) = pal[ ( p >> 2 ) & 3 ]; + state->m_bitmap.pix16(i * 4 + 3, state->m_scanline) = pal[ ( p ) & 3 ]; + } + } + + state->m_scanline = ( state->m_scanline + 1 ) % Y_PIXELS; +} + +VIDEO_START( gamecom ) +{ + gamecom_state *state = machine.driver_data<gamecom_state>(); + state->m_scanline_timer = machine.scheduler().timer_alloc(FUNC(gamecom_scanline)); + state->m_scanline_timer->adjust( machine.primary_screen->time_until_pos(0 ), 0, machine.primary_screen->scan_period() ); + machine.primary_screen->register_screen_bitmap(state->m_bitmap); +} |