/***************************************************************************
Atari System 2 hardware
****************************************************************************/
#include "driver.h"
#include "machine/atarigen.h"
#include "slapstic.h"
#include "atarisy2.h"
/*************************************
*
* Globals we own
*
*************************************/
UINT16 *atarisy2_slapstic;
/*************************************
*
* Statics
*
*************************************/
static emu_timer *yscroll_reset_timer;
static UINT32 playfield_tile_bank[2];
static UINT32 videobank;
static UINT16 *vram;
/*************************************
*
* Prototypes
*
*************************************/
static TIMER_CALLBACK( reset_yscroll_callback );
/*************************************
*
* Tilemap callbacks
*
*************************************/
static TILE_GET_INFO( get_alpha_tile_info )
{
UINT16 data = atarigen_alpha[tile_index];
int code = data & 0x3ff;
int color = (data >> 13) & 0x07;
SET_TILE_INFO(2, code, color, 0);
}
static TILE_GET_INFO( get_playfield_tile_info )
{
UINT16 data = atarigen_playfield[tile_index];
int code = playfield_tile_bank[(data >> 10) & 1] + (data & 0x3ff);
int color = (data >> 11) & 7;
SET_TILE_INFO(0, code, color, 0);
tileinfo->category = (~data >> 14) & 3;
}
/*************************************
*
* Video system start
*
*************************************/
VIDEO_START( atarisy2 )
{
static const struct atarimo_desc modesc =
{
1, /* index to which gfx system */
1, /* number of motion object banks */
1, /* are the entries linked? */
0, /* are the entries split? */
0, /* render in reverse order? */
0, /* render in swapped X/Y order? */
0, /* does the neighbor bit affect the next object? */
0, /* pixels per SLIP entry (0 for no-slip) */
0, /* pixel offset for SLIPs */
0, /* maximum number of links to visit/scanline (0=all) */
0x00, /* base palette entry */
0x40, /* maximum number of colors */
15, /* transparent pen index */
{{ 0,0,0,0x07f8 }}, /* mask for the link */
{{ 0 }}, /* mask for the graphics bank */
{{ 0,0x07ff,0,0 }}, /* mask for the code index */
{{ 0x0007,0,0,0 }}, /* mask for the upper code index */
{{ 0,0,0,0x3000 }}, /* mask for the color */
{{ 0,0,0xffc0,0 }}, /* mask for the X position */
{{ 0x7fc0,0,0,0 }}, /* mask for the Y position */
{{ 0 }}, /* mask for the width, in tiles*/
{{ 0,0x3800,0,0 }}, /* mask for the height, in tiles */
{{ 0,0x4000,0,0 }}, /* mask for the horizontal flip */
{{ 0 }}, /* mask for the vertical flip */
{{ 0,0,0,0xc000 }}, /* mask for the priority */
{{ 0,0x8000,0,0 }}, /* mask for the neighbor */
{{ 0 }}, /* mask for absolute coordinates */
{{ 0 }}, /* mask for the special value */
0, /* resulting value to indicate "special" */
0 /* callback routine for special entries */
};
/* allocate banked memory */
vram = auto_malloc(0x8000);
memset(vram, 0, 0x8000);
atarigen_alpha = &vram[0x0000];
atarimo_0_spriteram = &vram[0x0c00];
atarigen_playfield = &vram[0x2000];
/* initialize the playfield */
atarigen_playfield_tilemap = tilemap_create(get_playfield_tile_info, tilemap_scan_rows, TILEMAP_TYPE_PEN, 8,8, 128,64);
/* initialize the motion objects */
atarimo_init(machine, 0, &modesc);
/* initialize the alphanumerics */
atarigen_alpha_tilemap = tilemap_create(get_alpha_tile_info, tilemap_scan_rows, TILEMAP_TYPE_PEN, 8,8, 64,48);
tilemap_set_transparent_pen(atarigen_alpha_tilemap, 0);
/* reset the statics */
yscroll_reset_timer = timer_alloc(reset_yscroll_callback);
videobank = 0;
}
/*************************************
*
* Scroll/playfield bank write
*
*************************************/
WRITE16_HANDLER( atarisy2_xscroll_w )
{
UINT16 oldscroll = *atarigen_xscroll;
UINT16 newscroll = oldscroll;
COMBINE_DATA(&newscroll);
/* if anything has changed, force a partial update */
if (newscroll != oldscroll)
video_screen_update_partial(0, video_screen_get_vpos(0));
/* update the playfield scrolling - hscroll is clocked on the following scanline */
tilemap_set_scrollx(atarigen_playfield_tilemap, 0, newscroll >> 6);
/* update the playfield banking */
if (playfield_tile_bank[0] != (newscroll & 0x0f) * 0x400)
{
playfield_tile_bank[0] = (newscroll & 0x0f) * 0x400;
tilemap_mark_all_tiles_dirty(atarigen_playfield_tilemap);
}
/* update the data */
*atarigen_xscroll = newscroll;
}
static TIMER_CALLBACK( reset_yscroll_callback )
{
tilemap_set_scrolly(atarigen_playfield_tilemap, 0, param);
}
WRITE16_HANDLER( atarisy2_yscroll_w )
{
UINT16 oldscroll = *atarigen_yscroll;
UINT16 newscroll = oldscroll;
COMBINE_DATA(&newscroll);
/* if anything has changed, force a partial update */
if (newscroll != oldscroll)
video_screen_update_partial(0, video_screen_get_vpos(0));
/* if bit 4 is zero, the scroll value is clocked in right away */
if (!(newscroll & 0x10))
tilemap_set_scrolly(atarigen_playfield_tilemap, 0, (newscroll >> 6) - video_screen_get_vpos(0));
else
timer_adjust(yscroll_reset_timer, video_screen_get_time_until_pos(0, 0, 0), newscroll >> 6, attotime_zero);
/* update the playfield banking */
if (playfield_tile_bank[1] != (newscroll & 0x0f) * 0x400)
{
playfield_tile_bank[1] = (newscroll & 0x0f) * 0x400;
tilemap_mark_all_tiles_dirty(atarigen_playfield_tilemap);
}
/* update the data */
*atarigen_yscroll = newscroll;
}
/*************************************
*
* Palette RAM write handler
*
*************************************/
WRITE16_HANDLER( atarisy2_paletteram_w )
{
static const int intensity_table[16] =
{
#define ZB 115
#define Z3 78
#define Z2 37
#define Z1 17
#define Z0 9
0, ZB+Z0, ZB+Z1, ZB+Z1+Z0, ZB+Z2, ZB+Z2+Z0, ZB+Z2+Z1, ZB+Z2+Z1+Z0,
ZB+Z3, ZB+Z3+Z0, ZB+Z3+Z1, ZB+Z3+Z1+Z0,ZB+ Z3+Z2, ZB+Z3+Z2+Z0, ZB+Z3+Z2+Z1, ZB+Z3+Z2+Z1+Z0
};
static const int color_table[16] =
{ 0x0, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xe, 0xf, 0xf };
int newword, inten, red, green, blue;
COMBINE_DATA(&paletteram16[offset]);
newword = paletteram16[offset];
inten = intensity_table[newword & 15];
red = (color_table[(newword >> 12) & 15] * inten) >> 4;
green = (color_table[(newword >> 8) & 15] * inten) >> 4;
blue = (color_table[(newword >> 4) & 15] * inten) >> 4;
palette_set_color(Machine, offset, MAKE_RGB(red, green, blue));
}
/*************************************
*
* Video RAM bank read/write handlers
*
*************************************/
READ16_HANDLER( atarisy2_slapstic_r )
{
int result = atarisy2_slapstic[offset];
slapstic_tweak(offset);
/* an extra tweak for the next opcode fetch */
videobank = slapstic_tweak(0x1234) * 0x1000;
return result;
}
WRITE16_HANDLER( atarisy2_slapstic_w )
{
slapstic_tweak(offset);
/* an extra tweak for the next opcode fetch */
videobank = slapstic_tweak(0x1234) * 0x1000;
}
/*************************************
*
* Video RAM read/write handlers
*
*************************************/
READ16_HANDLER( atarisy2_videoram_r )
{
return vram[offset | videobank];
}
WRITE16_HANDLER( atarisy2_videoram_w )
{
int offs = offset | videobank;
/* alpharam? */
if (offs < 0x0c00)
{
COMBINE_DATA(&atarigen_alpha[offs]);
tilemap_mark_tile_dirty(atarigen_alpha_tilemap, offs);
}
/* spriteram? */
else if (offs < 0x1000)
{
/* force an update if the link of object 0 is about to change */
if (offs == 0x0c03)
video_screen_update_partial(0, video_screen_get_vpos(0));
atarimo_0_spriteram_w(offs - 0x0c00, data, mem_mask);
}
/* playfieldram? */
else if (offs >= 0x2000)
{
offs -= 0x2000;
COMBINE_DATA(&atarigen_playfield[offs]);
tilemap_mark_tile_dirty(atarigen_playfield_tilemap, offs);
}
/* generic case */
else
{
COMBINE_DATA(&vram[offs]);
}
}
/*************************************
*
* Main refresh
*
*************************************/
VIDEO_UPDATE( atarisy2 )
{
struct atarimo_rect_list rectlist;
mame_bitmap *mobitmap;
int x, y, r;
/* draw the playfield */
fillbitmap(priority_bitmap, 0, cliprect);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 0, 0);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 1, 1);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 2, 2);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 3, 3);
/* draw and merge the MO */
mobitmap = atarimo_render(machine, 0, cliprect, &rectlist);
for (r = 0; r < rectlist.numrects; r++, rectlist.rect++)
for (y = rectlist.rect->min_y; y <= rectlist.rect->max_y; y++)
{
UINT16 *mo = (UINT16 *)mobitmap->base + mobitmap->rowpixels * y;
UINT16 *pf = (UINT16 *)bitmap->base + bitmap->rowpixels * y;
UINT8 *pri = (UINT8 *)priority_bitmap->base + priority_bitmap->rowpixels * y;
for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++)
if (mo[x] != 0x0f)
{
int mopriority = mo[x] >> ATARIMO_PRIORITY_SHIFT;
/* high priority PF? */
if ((mopriority + pri[x]) & 2)
{
/* only gets priority if PF pen is less than 8 */
if (!(pf[x] & 0x08))
pf[x] = mo[x] & ATARIMO_DATA_MASK;
}
/* low priority */
else
pf[x] = mo[x] & ATARIMO_DATA_MASK;
/* erase behind ourselves */
mo[x] = 0x0f;
}
}
/* add the alpha on top */
tilemap_draw(bitmap, cliprect, atarigen_alpha_tilemap, 0, 0);
return 0;
}