/***************************************************************************
Atari Vindicators hardware
****************************************************************************/
#include "emu.h"
#include "video/atarimo.h"
#include "includes/vindictr.h"
/*************************************
*
* Tilemap callbacks
*
*************************************/
static TILE_GET_INFO( get_alpha_tile_info )
{
vindictr_state *state = machine.driver_data<vindictr_state>();
UINT16 data = state->m_alpha[tile_index];
int code = data & 0x3ff;
int color = ((data >> 10) & 0x0f) | ((data >> 9) & 0x20);
int opaque = data & 0x8000;
SET_TILE_INFO(1, code, color, opaque ? TILE_FORCE_LAYER0 : 0);
}
static TILE_GET_INFO( get_playfield_tile_info )
{
vindictr_state *state = machine.driver_data<vindictr_state>();
UINT16 data = state->m_playfield[tile_index];
int code = (state->m_playfield_tile_bank * 0x1000) + (data & 0xfff);
int color = 0x10 + 2 * ((data >> 12) & 7);
SET_TILE_INFO(0, code, color, (data >> 15) & 1);
}
/*************************************
*
* Video system start
*
*************************************/
VIDEO_START( vindictr )
{
static const atarimo_desc modesc =
{
0, /* 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? */
8, /* pixels per SLIP entry (0 for no-slip) */
0, /* pixel offset for SLIPs */
0, /* maximum number of links to visit/scanline (0=all) */
0x100, /* base palette entry */
0x100, /* maximum number of colors */
0, /* transparent pen index */
{{ 0,0,0,0x03ff }}, /* mask for the link */
{{ 0 }}, /* mask for the graphics bank */
{{ 0x7fff,0,0,0 }}, /* mask for the code index */
{{ 0 }}, /* mask for the upper code index */
{{ 0,0x000f,0,0 }}, /* mask for the color */
{{ 0,0xff80,0,0 }}, /* mask for the X position */
{{ 0,0,0xff80,0 }}, /* mask for the Y position */
{{ 0,0,0x0038,0 }}, /* mask for the width, in tiles*/
{{ 0,0,0x0007,0 }}, /* mask for the height, in tiles */
{{ 0,0,0x0040,0 }}, /* mask for the horizontal flip */
{{ 0 }}, /* mask for the vertical flip */
{{ 0,0x0070,0,0 }}, /* mask for the priority */
{{ 0 }}, /* mask for the neighbor */
{{ 0 }}, /* mask for absolute coordinates */
{{ 0 }}, /* mask for the special value */
0, /* resulting value to indicate "special" */
NULL /* callback routine for special entries */
};
vindictr_state *state = machine.driver_data<vindictr_state>();
/* initialize the playfield */
state->m_playfield_tilemap = tilemap_create(machine, get_playfield_tile_info, tilemap_scan_cols, 8,8, 64,64);
/* initialize the motion objects */
atarimo_init(machine, 0, &modesc);
/* initialize the alphanumerics */
state->m_alpha_tilemap = tilemap_create(machine, get_alpha_tile_info, tilemap_scan_rows, 8,8, 64,32);
tilemap_set_transparent_pen(state->m_alpha_tilemap, 0);
/* save states */
state->save_item(NAME(state->m_playfield_tile_bank));
state->save_item(NAME(state->m_playfield_xscroll));
state->save_item(NAME(state->m_playfield_yscroll));
}
/*************************************
*
* Palette RAM control
*
*************************************/
WRITE16_HANDLER( vindictr_paletteram_w )
{
static const int ztable[16] =
{ 0x0, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x10, 0x11 };
int c;
/* first blend the data */
COMBINE_DATA(&space->machine().generic.paletteram.u16[offset]);
data = space->machine().generic.paletteram.u16[offset];
/* now generate colors at all 16 intensities */
for (c = 0; c < 8; c++)
{
int i = ztable[((data >> 12) + (c * 2)) & 15];
int r = ((data >> 8) & 15) * i;
int g = ((data >> 4) & 15) * i;
int b = ((data >> 0) & 15) * i;
palette_set_color(space->machine(),offset + c*2048,MAKE_RGB(r,g,b));
}
}
/*************************************
*
* Periodic scanline updater
*
*************************************/
void vindictr_scanline_update(screen_device &screen, int scanline)
{
vindictr_state *state = screen.machine().driver_data<vindictr_state>();
UINT16 *base = &state->m_alpha[((scanline - 8) / 8) * 64 + 42];
int x;
/* keep in range */
if (base < state->m_alpha)
base += 0x7c0;
else if (base >= &state->m_alpha[0x7c0])
return;
/* update the current parameters */
for (x = 42; x < 64; x++)
{
UINT16 data = *base++;
switch ((data >> 9) & 7)
{
case 2: /* /PFB */
if (state->m_playfield_tile_bank != (data & 7))
{
screen.update_partial(scanline - 1);
state->m_playfield_tile_bank = data & 7;
tilemap_mark_all_tiles_dirty(state->m_playfield_tilemap);
}
break;
case 3: /* /PFHSLD */
if (state->m_playfield_xscroll != (data & 0x1ff))
{
screen.update_partial(scanline - 1);
tilemap_set_scrollx(state->m_playfield_tilemap, 0, data);
state->m_playfield_xscroll = data & 0x1ff;
}
break;
case 4: /* /MOHS */
if (atarimo_get_xscroll(0) != (data & 0x1ff))
{
screen.update_partial(scanline - 1);
atarimo_set_xscroll(0, data & 0x1ff);
}
break;
case 5: /* /PFSPC */
break;
case 6: /* /VIRQ */
atarigen_scanline_int_gen(screen.machine().device("maincpu"));
break;
case 7: /* /PFVS */
{
/* a new vscroll latches the offset into a counter; we must adjust for this */
int offset = scanline;
const rectangle &visible_area = screen.visible_area();
if (offset > visible_area.max_y)
offset -= visible_area.max_y + 1;
if (state->m_playfield_yscroll != ((data - offset) & 0x1ff))
{
screen.update_partial(scanline - 1);
tilemap_set_scrolly(state->m_playfield_tilemap, 0, data - offset);
atarimo_set_yscroll(0, (data - offset) & 0x1ff);
}
break;
}
}
}
}
/*************************************
*
* Main refresh
*
*************************************/
SCREEN_UPDATE( vindictr )
{
vindictr_state *state = screen->machine().driver_data<vindictr_state>();
atarimo_rect_list rectlist;
bitmap_t *mobitmap;
int x, y, r;
/* draw the playfield */
tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 0, 0);
/* draw and merge the MO */
mobitmap = atarimo_render(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;
for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++)
if (mo[x])
{
/* partially verified via schematics (there are a lot of PALs involved!):
SHADE = PAL(MPR1-0, LB7-0, PFX6-5, PFX3-2, PF/M)
if (SHADE)
CRA |= 0x100
MOG3-1 = ~MAT3-1 if MAT6==1 and MSD3==1
*/
int mopriority = mo[x] >> ATARIMO_PRIORITY_SHIFT;
/* upper bit of MO priority signals special rendering and doesn't draw anything */
if (mopriority & 4)
continue;
/* MO pen 1 doesn't draw, but it sets the SHADE flag and bumps the palette offset */
if ((mo[x] & 0x0f) == 1)
{
if ((mo[x] & 0xf0) != 0)
pf[x] |= 0x100;
}
else
pf[x] = mo[x] & ATARIMO_DATA_MASK;
/* don't erase yet -- we need to make another pass later */
}
}
/* add the alpha on top */
tilemap_draw(bitmap, cliprect, state->m_alpha_tilemap, 0, 0);
/* now go back and process the upper bit of MO priority */
rectlist.rect -= rectlist.numrects;
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;
for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++)
if (mo[x])
{
int mopriority = mo[x] >> ATARIMO_PRIORITY_SHIFT;
/* upper bit of MO priority might mean palette kludges */
if (mopriority & 4)
{
/* if bit 2 is set, start setting high palette bits */
if (mo[x] & 2)
atarimo_mark_high_palette(bitmap, pf, mo, x, y);
/* if the upper bit of pen data is set, we adjust the final intensity */
if (mo[x] & 8)
pf[x] |= (~mo[x] & 0xe0) << 6;
}
/* erase behind ourselves */
mo[x] = 0;
}
}
return 0;
}