diff options
Diffstat (limited to 'src/mame/video/gamecom.c')
-rw-r--r-- | src/mame/video/gamecom.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/mame/video/gamecom.c b/src/mame/video/gamecom.c new file mode 100644 index 00000000000..29bad2d9ce7 --- /dev/null +++ b/src/mame/video/gamecom.c @@ -0,0 +1,71 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol, Robbbert + +#include "includes/gamecom.h" + +#define Y_PIXELS 200 + + +TIMER_CALLBACK_MEMBER(gamecom_state::gamecom_scanline) + { + // draw line + m_base_address = ( m_p_ram[SM8521_LCDC] & 0x40 ) ? 0x2000 : 0x0000; + + if ( ~m_p_ram[SM8521_LCDC] & 0x80 ) + { + rectangle rec(0, Y_PIXELS - 1, m_scanline, m_scanline); + m_bitmap.fill(0, rec ); + return; + } + else + { + UINT8 *line = &m_p_videoram[ m_base_address + 40 * m_scanline ]; + int pal[4]; + int i; + + switch( 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]; + m_bitmap.pix16(i * 4 + 0, m_scanline) = pal[ ( p >> 6 ) & 3 ]; + m_bitmap.pix16(i * 4 + 1, m_scanline) = pal[ ( p >> 4 ) & 3 ]; + m_bitmap.pix16(i * 4 + 2, m_scanline) = pal[ ( p >> 2 ) & 3 ]; + m_bitmap.pix16(i * 4 + 3, m_scanline) = pal[ ( p ) & 3 ]; + } + } + + m_scanline = ( m_scanline + 1 ) % Y_PIXELS; +} + +void gamecom_state::video_start() +{ + m_scanline_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(gamecom_state::gamecom_scanline),this)); + m_scanline_timer->adjust( machine().first_screen()->time_until_pos(0 ), 0, machine().first_screen()->scan_period() ); + machine().first_screen()->register_screen_bitmap(m_bitmap); +} |