/*******************************************************************************
Dr. Micro (c) 1983 Sanritsu
Video hardware
driver by Uki
*******************************************************************************/
#include "emu.h"
#include "includes/drmicro.h"
/****************************************************************************/
WRITE8_HANDLER( drmicro_videoram_w )
{
drmicro_state *state = space->machine().driver_data<drmicro_state>();
state->m_videoram[offset] = data;
if (offset < 0x800)
tilemap_mark_tile_dirty(state->m_bg2, (offset & 0x3ff));
else
tilemap_mark_tile_dirty(state->m_bg1, (offset & 0x3ff));
}
/****************************************************************************/
static TILE_GET_INFO( get_bg1_tile_info )
{
drmicro_state *state = machine.driver_data<drmicro_state>();
int code, col, flags;
code = state->m_videoram[tile_index + 0x0800];
col = state->m_videoram[tile_index + 0x0c00];
code += (col & 0xc0) << 2;
flags = ((col & 0x20) ? TILEMAP_FLIPY : 0) | ((col & 0x10) ? TILEMAP_FLIPX : 0);
col &= 0x0f;
SET_TILE_INFO( 0, code, col, flags);
}
static TILE_GET_INFO( get_bg2_tile_info )
{
drmicro_state *state = machine.driver_data<drmicro_state>();
int code, col, flags;
code = state->m_videoram[tile_index + 0x0000];
col = state->m_videoram[tile_index + 0x0400];
code += (col & 0xc0) << 2;
flags = ((col & 0x20) ? TILEMAP_FLIPY : 0) | ((col & 0x10) ? TILEMAP_FLIPX : 0);
col &= 0x0f;
SET_TILE_INFO( 1, code, col, flags);
}
/****************************************************************************/
PALETTE_INIT( drmicro )
{
int i;
/* allocate the colortable */
machine.colortable = colortable_alloc(machine, 0x20);
/* create a lookup table for the palette */
for (i = 0; i < 0x20; i++)
{
int bit0, bit1, bit2;
int r, g, b;
/* red component */
bit0 = (color_prom[i] >> 0) & 0x01;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (color_prom[i] >> 6) & 0x01;
bit2 = (color_prom[i] >> 7) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
colortable_palette_set_color(machine.colortable, i, MAKE_RGB(r, g, b));
}
/* color_prom now points to the beginning of the lookup table */
color_prom += 0x20;
for (i = 0; i < 0x200; i++)
{
UINT8 ctabentry = color_prom[i] & 0x0f;
colortable_entry_set_value(machine.colortable, i, ctabentry);
}
}
VIDEO_START( drmicro)
{
drmicro_state *state = machine.driver_data<drmicro_state>();
state->m_videoram = auto_alloc_array(machine, UINT8, 0x1000);
state->save_pointer(NAME(state->m_videoram), 0x1000);
state->m_bg1 = tilemap_create(machine, get_bg1_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
state->m_bg2 = tilemap_create(machine, get_bg2_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
tilemap_set_transparent_pen(state->m_bg2, 0);
}
SCREEN_UPDATE( drmicro )
{
drmicro_state *state = screen->machine().driver_data<drmicro_state>();
int offs, adr, g;
int chr, col, attr;
int x, y, fx, fy;
tilemap_draw(bitmap, cliprect, state->m_bg1, 0, 0);
tilemap_draw(bitmap, cliprect, state->m_bg2, 0, 0);
/* draw sprites */
for (g = 0; g < 2; g++)
{
adr = 0x800 * g;
for (offs = 0x00; offs < 0x20; offs += 4)
{
x = state->m_videoram[offs + adr + 3];
y = state->m_videoram[offs + adr + 0];
attr = state->m_videoram[offs + adr + 2];
chr = state->m_videoram[offs + adr + 1];
fx = (chr & 0x01) ^ state->m_flipscreen;
fy = ((chr & 0x02) >> 1) ^ state->m_flipscreen;
chr = (chr >> 2) | (attr & 0xc0);
col = (attr & 0x0f) + 0x00;
if (!state->m_flipscreen)
y = (240 - y) & 0xff;
else
x = (240 - x) & 0xff;
drawgfx_transpen(bitmap,cliprect,screen->machine().gfx[3-g],
chr,
col,
fx,fy,
x,y,0);
if (x > 240)
{
drawgfx_transpen(bitmap,cliprect,screen->machine().gfx[3-g],
chr,
col,
fx,fy,
x-256,y,0);
}
}
}
return 0;
}