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// 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 const *const line = &m_p_videoram[ m_base_address + 40 * m_scanline ];
int pal[4]{};
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( int i = 0; i < 40; i++ )
{
uint8_t p = line[i];
m_bitmap.pix(i * 4 + 0, m_scanline) = pal[ ( p >> 6 ) & 3 ];
m_bitmap.pix(i * 4 + 1, m_scanline) = pal[ ( p >> 4 ) & 3 ];
m_bitmap.pix(i * 4 + 2, m_scanline) = pal[ ( p >> 2 ) & 3 ];
m_bitmap.pix(i * 4 + 3, m_scanline) = pal[ ( p ) & 3 ];
}
}
m_scanline = ( m_scanline + 1 ) % Y_PIXELS;
}
void gamecom_state::video_start()
{
m_scanline_timer = timer_alloc(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);
m_base_address = 0;
m_scanline = 0;
}
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