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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic, Robbbert
/***************************************************************************
LLC driver by Miodrag Milanovic
17/04/2009 Preliminary driver.
****************************************************************************/
#include "includes/llc.h"
void llc_state::video_start()
{
m_p_chargen = memregion("chargen")->base();
}
UINT32 llc_state::screen_update_llc1(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
UINT8 y,ra,chr,gfx,inv;
UINT16 sy=0,ma=0,x;
for (y = 0; y < 16; y++)
{
for (ra = 0; ra < 8; ra++)
{
UINT16 *p = &bitmap.pix16(sy++);
for (x = ma; x < ma + 64; x++)
{
inv = (m_p_videoram[x] & 0x80) ? 0xff : 0;
chr = m_p_videoram[x] & 0x7f;
/* get pattern of pixels for that character scanline */
gfx = m_p_chargen[ chr | (ra << 7) ] ^ inv;
/* Display a scanline of a character (8 pixels) */
*p++ = BIT(gfx, 7);
*p++ = BIT(gfx, 6);
*p++ = BIT(gfx, 5);
*p++ = BIT(gfx, 4);
*p++ = BIT(gfx, 3);
*p++ = BIT(gfx, 2);
*p++ = BIT(gfx, 1);
*p++ = BIT(gfx, 0);
}
}
ma+=64;
}
return 0;
}
UINT32 llc_state::screen_update_llc2(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
UINT8 y,ra,chr,gfx,inv, inv1=m_rv ? 0xff : 0;
UINT16 sy=0,ma=0,x;
for (y = 0; y < 32; y++)
{
for (ra = 0; ra < 8; ra++)
{
inv = 0;
UINT16 *p = &bitmap.pix16(sy++);
for (x = ma; x < ma + 64; x++)
{
chr = m_p_videoram[x];
if (chr==0x11) // inverse on
{
inv=0xff;
chr=0x0f; // must not show
}
else
if (chr==0x10) // inverse off
inv=0;
/* get pattern of pixels for that character scanline */
gfx = m_p_chargen[ (chr << 3) | ra ] ^ inv ^ inv1;
/* Display a scanline of a character (8 pixels) */
*p++ = BIT(gfx, 7);
*p++ = BIT(gfx, 6);
*p++ = BIT(gfx, 5);
*p++ = BIT(gfx, 4);
*p++ = BIT(gfx, 3);
*p++ = BIT(gfx, 2);
*p++ = BIT(gfx, 1);
*p++ = BIT(gfx, 0);
}
}
ma+=64;
}
return 0;
}
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