// license:BSD-3-Clause // copyright-holders:Wilbert Pol, Robbbert #include "emu.h" #include "includes/gamecom.h" #include "screen.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_t *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_t 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(m_screen->time_until_pos(0), 0, m_screen->scan_period()); m_screen->register_screen_bitmap(m_bitmap); }