// license:BSD-3-Clause
// copyright-holders:Aaron Giles, Phil Bennett
/***************************************************************************
Atari Cyberstorm hardware
****************************************************************************/
#include "emu.h"
#include "includes/cybstorm.h"
/*************************************
*
* Tilemap callbacks
*
*************************************/
TILE_GET_INFO_MEMBER(cybstorm_state::get_alpha_tile_info)
{
uint16_t data = m_vad->alpha().basemem_read(tile_index);
int code = ((data & 0x400) ? (m_alpha_tile_bank * 0x400) : 0) + (data & 0x3ff);
int color = (data >> 11) & 0x0f;
int opaque = data & 0x8000;
SET_TILE_INFO_MEMBER(2, code, color, opaque ? TILEMAP_PIXEL_LAYER0 : 0);
}
TILE_GET_INFO_MEMBER(cybstorm_state::get_playfield_tile_info)
{
uint16_t data1 = m_vad->playfield().basemem_read(tile_index);
uint16_t data2 = m_vad->playfield().extmem_read(tile_index) & 0xff;
int code = data1;
int color = 8 + (data2 & 0x07);
SET_TILE_INFO_MEMBER(0, code, color, data2 & 0x80 ? TILE_FLIPX : 0);
tileinfo.category = (data2 >> 4) & 3;
}
TILE_GET_INFO_MEMBER(cybstorm_state::get_playfield2_tile_info)
{
uint16_t data1 = m_vad->playfield2().basemem_read(tile_index);
uint16_t data2 = m_vad->playfield2().extmem_read(tile_index) >> 8;
int code = data1;
int color = data2 & 0x07;
SET_TILE_INFO_MEMBER(0, code, color, data2 & 0x80 ? TILE_FLIPX : 0);
tileinfo.category = (data2 >> 4) & 3;
}
TILEMAP_MAPPER_MEMBER(cybstorm_state::playfield_scan)
{
int bank = 1 - (col / (num_cols / 2));
return bank * (num_rows * num_cols / 2) + row * (num_cols / 2) + (col % (num_cols / 2));
}
/*************************************
*
* Video system start
*
*************************************/
const atari_motion_objects_config cybstorm_state::s_mob_config =
{
1, /* index to which gfx system */
1, /* number of motion object banks */
1, /* are the entries linked? */
0, /* are the entries split? */
1, /* 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) */
0x1000, /* base palette entry */
0x1000, /* maximum number of colors */
0, /* transparent pen index */
{{ 0x03ff,0,0,0 }}, /* mask for the link */
{{ 0,0x7fff,0,0 }, { 0x3c00,0,0,0 }}, /* mask for the code index */
{{ 0,0,0x000f,0 }}, /* mask for the color */
{{ 0,0,0xff80,0 }}, /* mask for the X position */
{{ 0,0,0,0xff80 }}, /* mask for the Y position */
{{ 0,0,0,0x0070 }}, /* mask for the width, in tiles*/
{{ 0,0,0,0x0007 }}, /* mask for the height, in tiles */
{{ 0,0x8000,0,0 }}, /* mask for the horizontal flip */
{{ 0 }}, /* mask for the vertical flip */
{{ 0,0,0x0070,0 }}, /* 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 cybstorm_state::video_start()
{
/* motion objects have 256 color granularity */
m_gfxdecode->gfx(1)->set_granularity(256);
}
/*************************************
*
* Main refresh
*
*************************************/
uint32_t cybstorm_state::screen_update_cybstorm(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_vad->mob().draw_async(cliprect);
/* draw the playfield */
bitmap_ind8 &priority_bitmap = screen.priority();
priority_bitmap.fill(0, cliprect);
m_vad->playfield().draw(screen, bitmap, cliprect, 0, 0x00);
m_vad->playfield().draw(screen, bitmap, cliprect, 1, 0x01);
m_vad->playfield().draw(screen, bitmap, cliprect, 2, 0x02);
m_vad->playfield().draw(screen, bitmap, cliprect, 3, 0x03);
m_vad->playfield2().draw(screen, bitmap, cliprect, 0, 0x80);
m_vad->playfield2().draw(screen, bitmap, cliprect, 1, 0x84);
m_vad->playfield2().draw(screen, bitmap, cliprect, 2, 0x88);
m_vad->playfield2().draw(screen, bitmap, cliprect, 3, 0x8c);
/* draw and merge the MO */
bitmap_ind16 &mobitmap = m_vad->mob().bitmap();
for (const sparse_dirty_rect *rect = m_vad->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);
uint8_t *pri = &priority_bitmap.pix8(y);
for (int x = rect->min_x; x <= rect->max_x; x++)
if (mo[x])
{
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)
{
if ((mopriority & 0x3) != 0)
continue;
}
/* foreground playfield case */
if (pri[x] & 0x80)
{
int pfpriority = (pri[x] >> 2) & 3;
if (mopriority > pfpriority)
pf[x] = (mo[x] & atari_motion_objects_device::DATA_MASK) | 0x1000;
}
/* background playfield case */
else
{
int pfpriority = pri[x] & 3;
/* playfield priority 3 always wins */
if (pfpriority == 3)
;
/* otherwise, MOs get shown */
else
pf[x] = (mo[x] & atari_motion_objects_device::DATA_MASK) | 0x1000;
}
/* don't erase yet -- we need to make another pass later */
}
}
/* now go back and process the upper bit of MO priority */
for (const sparse_dirty_rect *rect = m_vad->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);
int count = 0;
for (int x = rect->min_x; x <= rect->max_x || (count && x < bitmap.width()); x++)
{
const uint16_t START_MARKER = ((4 << atari_motion_objects_device::PRIORITY_SHIFT) | 3);
const uint16_t END_MARKER = ((4 << atari_motion_objects_device::PRIORITY_SHIFT) | 7);
const uint16_t MASK = ((4 << atari_motion_objects_device::PRIORITY_SHIFT) | 0x3f);
// TODO: Stain pixels should not overlap sprites!
if ((mo[x] & MASK) == START_MARKER)
{
count++;
}
if (count)
{
// Only applies to PF pixels
if ((pf[x] & 0x1000) == 0)
{
pf[x] |= 0x2000;
}
}
if ((mo[x] & MASK) == END_MARKER)
{
count--;
}
/* erase behind ourselves */
mo[x] = 0;
}
}
/* add the alpha on top */
m_vad->alpha().draw(screen, bitmap, cliprect, 0, 0);
return 0;
}