// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
Atari ThunderJaws hardware
****************************************************************************/
#include "emu.h"
#include "includes/thunderj.h"
/*************************************
*
* Tilemap callbacks
*
*************************************/
TILE_GET_INFO_MEMBER(thunderj_state::get_alpha_tile_info)
{
uint16_t data = m_vad->alpha().basemem_read(tile_index);
int code = ((data & 0x200) ? (m_alpha_tile_bank * 0x200) : 0) + (data & 0x1ff);
int color = ((data >> 10) & 0x0f) | ((data >> 9) & 0x20);
int opaque = data & 0x8000;
SET_TILE_INFO_MEMBER(2, code, color, opaque ? TILE_FORCE_LAYER0 : 0);
}
TILE_GET_INFO_MEMBER(thunderj_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 & 0x7fff;
int color = 0x10 + (data2 & 0x0f);
SET_TILE_INFO_MEMBER(0, code, color, (data1 >> 15) & 1);
tileinfo.category = (data2 >> 4) & 3;
}
TILE_GET_INFO_MEMBER(thunderj_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 & 0x7fff;
int color = data2 & 0x0f;
SET_TILE_INFO_MEMBER(0, code, color, (data1 >> 15) & 1);
tileinfo.category = (data2 >> 4) & 3;
}
/*************************************
*
* Video system start
*
*************************************/
const atari_motion_objects_config thunderj_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) */
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 */
{{ 0,0x8000,0,0 }}, /* 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" */
};
/*************************************
*
* Main refresh
*
*************************************/
uint32_t thunderj_state::screen_update_thunderj(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
// start drawing
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->top(); y <= rect->bottom(); y++)
{
uint16_t *mo = &mobitmap.pix16(y);
uint16_t *pf = &bitmap.pix16(y);
uint8_t *pri = &priority_bitmap.pix8(y);
for (int x = rect->left(); x <= rect->right(); x++)
if (mo[x] != 0xffff)
{
/* verified from the GALs on the real PCB; equations follow
*
* --- PF/M is 1 if playfield has priority, or 0 if MOs have priority
* PF/M=MPX0*!MPX1*!MPX2*!MPX3*!MPX4*!MPX5*!MPX6*!MPX7
* +PFX3*PFX8*PFX9*!MPR0
* +PFX3*PFX8*!MPR0*!MPR1
* +PFX3*PFX9*!MPR1
*
* --- CS1 is 1 if the playfield should be displayed
* CS1=PF/M*!ALBG*!APIX0*!APIX1
* +!MPX0*!MPX1*!MPX2*!MPX3*!ALBG*!APIX0*!APIX1
*
* --- CS0 is 1 if the MOs should be displayed
* CS0=!PF/M*MPX0*!ALBG*!APIX0*!APIX1
* +!PF/M*MPX1*!ALBG*!APIX0*!APIX1
* +!PF/M*MPX2*!ALBG*!APIX0*!APIX1
* +!PF/M*MPX3*!ALBG*!APIX0*!APIX1
*
* --- CRA10 is the 0x200 bit of the color RAM index; set if pf is displayed
* CRA10:=CS1
*
* --- CRA9 is the 0x100 bit of the color RAM index; set if mo is displayed
* or if the playfield selected is playfield #2
* CRA9:=PFXS*CS1
* +!CS1*CS0
*
* --- CRA8-1 are the low 8 bits of the color RAM index; set as expected
* CRA8:=CS1*PFX7
* +!CS1*MPX7*CS0
* +!CS1*!CS0*ALC4
*
* CRA7:=CS1*PFX6
* +!CS1*MPX6*CS0
*
* CRA6:=CS1*PFX5
* +MPX5*!CS1*CS0
* +!CS1*!CS0*ALC3
*
* CRA5:=CS1*PFX4
* +MPX4*!CS1*CS0
* +!CS1*ALC2*!CS0
*
* CRA4:=CS1*PFX3
* +!CS1*MPX3*CS0
* +!CS1*!CS0*ALC1
*
* CRA3:=CS1*PFX2
* +MPX2*!CS1*CS0
* +!CS1*!CS0*ALC0
*
* CRA2:=CS1*PFX1
* +MPX1*!CS1*CS0
* +!CS1*!CS0*APIX1
*
* CRA1:=CS1*PFX0
* +MPX0*!CS1*CS0
* +!CS1*!CS0*APIX0
*/
int mopriority = mo[x] >> atari_motion_objects_device::PRIORITY_SHIFT;
int pfm = 0;
/* upper bit of MO priority signals special rendering and doesn't draw anything */
if (mopriority & 4)
continue;
/* determine pf/m signal */
if ((mo[x] & 0xff) == 1)
pfm = 1;
else if (pf[x] & 8)
{
int pfpriority = (pri[x] & 0x80) ? ((pri[x] >> 2) & 3) : (pri[x] & 3);
if (((pfpriority == 3) && !(mopriority & 1)) ||
((pfpriority & 1) && (mopriority == 0)) ||
((pfpriority & 2) && !(mopriority & 2)))
pfm = 1;
}
/* if pfm is low, we display the mo */
if (!pfm)
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_vad->alpha().draw(screen, bitmap, cliprect, 0, 0);
/* 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->top(); y <= rect->bottom(); y++)
{
uint16_t *mo = &mobitmap.pix16(y);
uint16_t *pf = &bitmap.pix16(y);
for (int x = rect->left(); x <= rect->right(); 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_vad->mob().apply_stain(bitmap, pf, mo, x, y);
}
}
}
return 0;
}