// license:BSD-3-Clause
// copyright-holders:Curt Coder
#include "emu.h"
#include "includes/mikromik.h"
#include "screen.h"
#define HORIZONTAL_CHARACTER_PIXELS 10
//-------------------------------------------------
// i8275 crtc display pixels
//-------------------------------------------------
I8275_DRAW_CHARACTER_MEMBER( mm1_state::crtc_display_pixels )
{
uint8_t romdata = m_char_rom->base()[(charcode << 4) | linecount];
int gpa0 = BIT(gpa, 0); // general purpose attribute 0
int llen = m_llen; // light enable
int compl_in = rvv; // reverse video
int hlt_in = hlgt; // highlight;
int color; // 0 = black, 1 = dk green, 2 = lt green; on MikroMikko 1, "highlight" is actually the darker shade of green
int i, qh, video_in;
int d7 = BIT(romdata, 7); // save MSB (1 indicates that this is a Visual Attribute or Special Code instead of a normal display character)
int d6 = BIT(romdata, 6); // save also first and last char bitmap bits before shifting out the MSB
int d0 = BIT(romdata, 0);
uint8_t data = (romdata << 1) | (d7 & d0); // get rid of MSB, duplicate LSB for special characters
if (y < 360 || x >= HORIZONTAL_CHARACTER_PIXELS || compl_in == 0) // leftmost char on the 25th row is never displayed on actual MikroMikko 1 HW if it's inversed
{
if (HORIZONTAL_CHARACTER_PIXELS == 10)
{
// Hack to stretch 8 pixels wide character bitmap to 10 pixels on screen.
// This was needed because high res graphics use 800 pixels wide bitmap but
// 80 chars * 8 pixels is only 640 -> characters would cover only 80% of the screen width.
// Step 1: Instead of 8, set MCFG_I8275_CHARACTER_WIDTH(10) at the end of this file
// Step 2: Make sure i8275_device::recompute_parameters() is called in i8275_device::device_start()
// Step 3: Fill in missing 2 pixels in the screen bitmap by repeating last column of the char bitmap
// (works better with MikroMikko 1 font than duplicating the first and the last column)
qh = d7 & d6; // extend pixels on the right side only if there were two adjacent ones before shifting out the MSB
video_in = ((((d7 & llen) | (vsp ? 0 : 1)) & (gpa0 ? 0 : 1)) & qh) | lten;
color = (hlt_in ? 1 : 2) * (video_in ^ compl_in);
bitmap.pix32(y, x + 8) = m_palette->pen(color);
bitmap.pix32(y, x + 9) = m_palette->pen(color);
}
for (i = 0; i < 8; ++i) // ...and now the actual character bitmap bits for this scanline
{
qh = BIT(data, i);
video_in = ((((d7 & llen) | (vsp ? 0 : 1)) & (gpa0 ? 0 : 1)) & qh) | lten;
color = (hlt_in ? 1 : 2)*(video_in ^ compl_in);
bitmap.pix32(y, x + i) = m_palette->pen(color);
}
}
}
//-------------------------------------------------
// ADDRESS_MAP( mm1_upd7220_map )
//-------------------------------------------------
void mm1_state::mm1_upd7220_map(address_map &map)
{
map.global_mask(0x7fff);
map(0x0000, 0x7fff).ram().share("video_ram");
}
//-------------------------------------------------
// UPD7220_INTERFACE( hgdc_intf )
//-------------------------------------------------
UPD7220_DISPLAY_PIXELS_MEMBER( mm1_state::hgdc_display_pixels )
{
uint16_t data = m_video_ram[address >> 1];
for (int i = 0; i < 16; i++)
{
if (BIT(data, i)) bitmap.pix32(y, x + i) = m_palette->pen(2);
}
}
uint32_t mm1_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
/* text */
m_crtc->screen_update(screen, bitmap, cliprect);
/* graphics */
m_hgdc->screen_update(screen, bitmap, cliprect);
return 0;
}
//-------------------------------------------------
// gfx_layout charlayout
//-------------------------------------------------
static const gfx_layout charlayout =
{
8, 16,
RGN_FRAC(1,1),
1,
{ 0 },
{ 7, 6, 5, 4, 3, 2, 1, 0 },
{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8,
8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
8*16
};
//-------------------------------------------------
// GFXDECODE( mm1 )
//-------------------------------------------------
static GFXDECODE_START( gfx_mm1 )
GFXDECODE_ENTRY( "chargen", 0, charlayout, 0, 1 )
GFXDECODE_END
PALETTE_INIT_MEMBER( mm1_state, mm1 )
{
palette.set_pen_color(0, rgb_t(0x00,0x00,0x00));
palette.set_pen_color(1, rgb_t(0x00,0x7F,0x0A)); // dark green ("highlight" mode color)
palette.set_pen_color(2, rgb_t(0x08,0xD0,0x1A)); // bright green (normal color)
}
//-------------------------------------------------
// MACHINE_CONFIG_START( mm1m6_video )
//-------------------------------------------------
MACHINE_CONFIG_START(mm1_state::mm1m6_video)
MCFG_SCREEN_ADD( SCREEN_TAG, RASTER )
MCFG_SCREEN_REFRESH_RATE( 50 )
MCFG_SCREEN_UPDATE_DRIVER(mm1_state, screen_update)
MCFG_SCREEN_SIZE( 800, 375 ) // (25 text rows * 15 vertical pixels / character)
MCFG_SCREEN_VISIBLE_AREA( 0, 800-1, 0, 375-1 )
//MCFG_SCREEN_RAW_PARAMS(XTAL(18'720'000), ...)
MCFG_DEVICE_ADD("gfxdecode", GFXDECODE, "palette", gfx_mm1)
MCFG_PALETTE_ADD("palette", 3)
MCFG_PALETTE_INIT_OWNER(mm1_state, mm1)
MCFG_DEVICE_ADD(I8275_TAG, I8275, XTAL(18'720'000)/8)
MCFG_I8275_CHARACTER_WIDTH(HORIZONTAL_CHARACTER_PIXELS)
MCFG_I8275_DRAW_CHARACTER_CALLBACK_OWNER(mm1_state, crtc_display_pixels)
MCFG_I8275_DRQ_CALLBACK(WRITELINE(I8237_TAG, am9517a_device, dreq0_w))
MCFG_I8275_VRTC_CALLBACK(WRITELINE(UPD7220_TAG, upd7220_device, ext_sync_w))
MCFG_VIDEO_SET_SCREEN(SCREEN_TAG)
MCFG_DEVICE_ADD(UPD7220_TAG, UPD7220, XTAL(18'720'000)/8)
MCFG_DEVICE_ADDRESS_MAP(0, mm1_upd7220_map)
MCFG_UPD7220_DISPLAY_PIXELS_CALLBACK_OWNER(mm1_state, hgdc_display_pixels)
MCFG_VIDEO_SET_SCREEN(SCREEN_TAG)
MACHINE_CONFIG_END