// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
Atari Escape hardware
****************************************************************************/
#include "emu.h"
#include "includes/eprom.h"
/*************************************
*
* Palette
*
*************************************/
void eprom_state::update_palette()
{
int color;
for (color = 0; color < 0x800; ++color)
{
int i, r, g, b;
uint16_t const data = m_generic_paletteram_16[color];
/* FIXME this is only a very crude approximation of the palette output.
* The circuit involves a dozen transistors and probably has an output
* which is quite different from this.
* This is, however, good enough to match the video and description
* of MAMETesters bug #02677.
*/
i = (((data >> 12) & 15) + 1) * (4 - m_screen_intensity);
if (i < 0)
i = 0;
r = ((data >> 8) & 15) * i / 4;
g = ((data >> 4) & 15) * i / 4;
b = ((data >> 0) & 15) * i / 4;
m_palette->set_pen_color(color, r, g, b);
}
}
/*************************************
*
* Tilemap callbacks
*
*************************************/
TILE_GET_INFO_MEMBER(eprom_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(eprom_state::get_playfield_tile_info)
{
uint16_t data1 = m_playfield_tilemap->basemem_read(tile_index);
uint16_t data2 = m_playfield_tilemap->extmem_read(tile_index) >> 8;
int code = data1 & 0x7fff;
int color = 0x10 + (data2 & 0x0f);
SET_TILE_INFO_MEMBER(0, code, color, (data1 >> 15) & 1);
}
TILE_GET_INFO_MEMBER(eprom_state::guts_get_playfield_tile_info)
{
uint16_t data1 = m_playfield_tilemap->basemem_read(tile_index);
uint16_t data2 = m_playfield_tilemap->extmem_read(tile_index) >> 8;
int code = data1 & 0x7fff;
int color = 0x10 + (data2 & 0x0f);
SET_TILE_INFO_MEMBER(2, code, color, (data1 >> 15) & 1);
}
/*************************************
*
* Video system start
*
*************************************/
const atari_motion_objects_config eprom_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? */
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) */
0x100, /* base palette entry */
0x100, /* maximum number of colors */
0, /* transparent pen index */
{{ 0x03ff,0,0,0 }}, /* mask for the link */
{{ 0,0x7fff,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 */
{{ 0,0,0,0x0008 }}, /* 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" */
};
VIDEO_START_MEMBER(eprom_state,eprom)
{
/* save states */
save_item(NAME(m_screen_intensity));
save_item(NAME(m_video_disable));
}
const atari_motion_objects_config eprom_state::s_guts_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 */
{{ 0x03ff,0,0,0 }}, /* mask for the link */
{{ 0,0x7fff,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*/
{{ 0,0,0,0x000f }}, /* 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" */
};
VIDEO_START_MEMBER(eprom_state,guts)
{
/* save states */
save_item(NAME(m_screen_intensity));
save_item(NAME(m_video_disable));
}
/*************************************
*
* Periodic scanline updater
*
*************************************/
void eprom_state::scanline_update(screen_device &screen, int scanline)
{
/* update the playfield */
if (scanline == 0)
{
int xscroll = (m_alpha_tilemap->basemem_read(0x780) >> 7) & 0x1ff;
int yscroll = (m_alpha_tilemap->basemem_read(0x781) >> 7) & 0x1ff;
m_playfield_tilemap->set_scrollx(0, xscroll);
m_playfield_tilemap->set_scrolly(0, yscroll);
m_mob->set_scroll(xscroll, yscroll);
}
}
/*************************************
*
* Main refresh
*
*************************************/
uint32_t eprom_state::screen_update_eprom(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
if (m_video_disable)
{
bitmap.fill(m_palette->black_pen(), cliprect);
return 0;
}
update_palette();
// 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)
{
/* verified from the GALs on the real PCB; equations follow
*
* --- FORCEMC0 forces 3 bits of the MO color to 0 under some conditions
* FORCEMC0=!PFX3*PFX4*PFX5*!MPR0
* +!PFX3*PFX5*!MPR1
* +!PFX3*PFX4*!MPR0*!MPR1
*
* --- SHADE selects an alternate color bank for the playfield
* !SHADE=!MPX0
* +MPX1
* +MPX2
* +MPX3
* +!MPX4*!MPX5*!MPX6*!MPX7
* +FORCEMC0
*
* --- PF/M is 1 if playfield has priority, or 0 if MOs have priority
* !PF/M=MPR0*MPR1
* +PFX3
* +!PFX4*MPR1
* +!PFX5*MPR1
* +!PFX5*MPR0
* +!PFX4*!PFX5*!MPR0*!MPR1
*
* --- M7 is passed as the upper MO bit to the GPC ASIC
* M7=MPX0*!MPX1*!MPX2*!MPX3
*
* --- CL10-9 are outputs from the GPC, specifying which layer to render
* CL10 = 1 if pf
* CL9 = 1 if mo
*
* --- CRA10 is the 0x200 bit of the color RAM index; it comes directly from the GPC
* CRA10 = CL10
*
* --- CRA9 is the 0x100 bit of the color RAM index; is comes directly from the GPC
* or if the SHADE flag is set, it affects the playfield color bank
* CRA9 = SHADE*CL10
* +CL9
*
* --- CRA8-1 are the low 8 bits of the color RAM index; set as expected
*/
int mopriority = (mo[x] >> atari_motion_objects_device::PRIORITY_SHIFT) & 7;
int pfpriority = (pf[x] >> 4) & 3;
int forcemc0 = 0, shade = 1, pfm = 1, m7 = 0;
/* upper bit of MO priority signals special rendering and doesn't draw anything */
if (mopriority & 4)
continue;
/* compute the FORCEMC signal */
if (!(pf[x] & 8))
{
if (((pfpriority == 3) && !(mopriority & 1)) ||
((pfpriority & 2) && !(mopriority & 2)) ||
((pfpriority & 1) && (mopriority == 0)))
forcemc0 = 1;
}
/* compute the SHADE signal */
if (((mo[x] & 0x0f) != 1) ||
((mo[x] & 0xf0) == 0) ||
forcemc0)
shade = 0;
/* compute the PF/M signal */
if ((mopriority == 3) ||
(pf[x] & 8) ||
(!(pfpriority & 1) && (mopriority & 2)) ||
(!(pfpriority & 2) && (mopriority & 2)) ||
(!(pfpriority & 2) && (mopriority & 1)) ||
((pfpriority == 0) && (mopriority == 0)))
pfm = 0;
/* compute the M7 signal */
if ((mo[x] & 0x0f) == 1)
m7 = 1;
/* PF/M and M7 go in the GPC ASIC and select playfield or MO layers */
if (!pfm && !m7)
{
if (!forcemc0)
pf[x] = mo[x] & atari_motion_objects_device::DATA_MASK;
else
pf[x] = mo[x] & atari_motion_objects_device::DATA_MASK & ~0x70;
}
else
{
if (shade)
pf[x] |= 0x100;
if (m7)
pf[x] |= 0x080;
}
}
}
/* 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);
}
}
}
return 0;
}
uint32_t eprom_state::screen_update_guts(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
if (m_video_disable)
{
bitmap.fill(m_palette->black_pen(), cliprect);
return 0;
}
update_palette();
// 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)
{
int mopriority = (mo[x] >> atari_motion_objects_device::PRIORITY_SHIFT) & 7;
int pfpriority = (pf[x] >> 5) & 3;
/* upper bit of MO priority signals special rendering and doesn't draw anything */
if (mopriority & 4)
continue;
/* check the priority */
if (!(pf[x] & 8) || mopriority >= pfpriority)
pf[x] = mo[x] & atari_motion_objects_device::DATA_MASK;
}
}
/* 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);
}
}
}
return 0;
}