// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
Atari Vindicators hardware
****************************************************************************/
#include "emu.h"
#include "includes/vindictr.h"
/*************************************
*
* Tilemap callbacks
*
*************************************/
TILE_GET_INFO_MEMBER(vindictr_state::get_alpha_tile_info)
{
uint16_t data = m_alpha_tilemap->basemem_read(tile_index);
int code = data & 0x3ff;
int color = ((data >> 10) & 0x0f) | ((data >> 9) & 0x20);
int opaque = data & 0x8000;
SET_TILE_INFO_MEMBER(1, code, color, opaque ? TILE_FORCE_LAYER0 : 0);
}
TILE_GET_INFO_MEMBER(vindictr_state::get_playfield_tile_info)
{
uint16_t data = m_playfield_tilemap->basemem_read(tile_index);
int code = (m_playfield_tile_bank * 0x1000) + (data & 0xfff);
int color = 0x10 + 2 * ((data >> 12) & 7);
SET_TILE_INFO_MEMBER(0, code, color, (data >> 15) & 1);
}
/*************************************
*
* Video system start
*
*************************************/
const atari_motion_objects_config vindictr_state::s_mob_config =
{
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 */
{{ 0x7fff,0,0,0 }}, /* mask for the 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" */
};
void vindictr_state::video_start()
{
/* save states */
save_item(NAME(m_playfield_tile_bank));
save_item(NAME(m_playfield_xscroll));
save_item(NAME(m_playfield_yscroll));
}
/*************************************
*
* Palette RAM control
*
*************************************/
WRITE16_MEMBER( vindictr_state::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(&m_generic_paletteram_16[offset]);
data = m_generic_paletteram_16[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;
m_palette->set_pen_color(offset + c*2048,rgb_t(r,g,b));
}
}
/*************************************
*
* Periodic scanline updater
*
*************************************/
void vindictr_state::scanline_update(screen_device &screen, int scanline)
{
int x;
/* keep in range */
int offset = ((scanline - 8) / 8) * 64 + 42;
if (offset < 0)
offset += 0x7c0;
else if (offset >= 0x7c0)
return;
/* update the current parameters */
for (x = 42; x < 64; x++)
{
uint16_t data = m_alpha_tilemap->basemem_read(offset++);
switch ((data >> 9) & 7)
{
case 2: /* /PFB */
if (m_playfield_tile_bank != (data & 7))
{
screen.update_partial(scanline - 1);
m_playfield_tile_bank = data & 7;
m_playfield_tilemap->mark_all_dirty();
}
break;
case 3: /* /PFHSLD */
if (m_playfield_xscroll != (data & 0x1ff))
{
screen.update_partial(scanline - 1);
m_playfield_tilemap->set_scrollx(0, data);
m_playfield_xscroll = data & 0x1ff;
}
break;
case 4: /* /MOHS */
if (m_mob->xscroll() != (data & 0x1ff))
{
screen.update_partial(scanline - 1);
m_mob->set_xscroll(data & 0x1ff);
}
break;
case 5: /* /PFSPC */
break;
case 6: /* /VIRQ */
scanline_int_gen(*m_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 (m_playfield_yscroll != ((data - offset) & 0x1ff))
{
screen.update_partial(scanline - 1);
m_playfield_tilemap->set_scrolly(0, data - offset);
m_mob->set_yscroll((data - offset) & 0x1ff);
}
break;
}
}
}
}
/*************************************
*
* Main refresh
*
*************************************/
uint32_t vindictr_state::screen_update_vindictr(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
// start drawing
m_mob->draw_async(cliprect);
/* draw the playfield */
m_playfield_tilemap->draw(screen, bitmap, cliprect, 0, 0);
// draw and merge the MO
bitmap_ind16 &mobitmap = m_mob->bitmap();
for (const sparse_dirty_rect *rect = m_mob->first_dirty_rect(cliprect); rect != nullptr; rect = rect->next())
for (int y = rect->min_y; y <= rect->max_y; y++)
{
uint16_t *mo = &mobitmap.pix16(y);
uint16_t *pf = &bitmap.pix16(y);
for (int x = rect->min_x; x <= rect->max_x; x++)
if (mo[x] != 0xffff)
{
/* 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] >> atari_motion_objects_device::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] & atari_motion_objects_device::DATA_MASK;
/* don't erase yet -- we need to make another pass later */
}
}
/* add the alpha on top */
m_alpha_tilemap->draw(screen, bitmap, cliprect, 0, 0);
/* now go back and process the upper bit of MO priority */
for (const sparse_dirty_rect *rect = m_mob->first_dirty_rect(cliprect); rect != nullptr; rect = rect->next())
for (int y = rect->min_y; y <= rect->max_y; y++)
{
uint16_t *mo = &mobitmap.pix16(y);
uint16_t *pf = &bitmap.pix16(y);
for (int x = rect->min_x; x <= rect->max_x; x++)
if (mo[x] != 0xffff)
{
int mopriority = mo[x] >> atari_motion_objects_device::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)
m_mob->apply_stain(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;
}
}
}
return 0;
}