/***************************************************************************
Atari ThunderJaws hardware
****************************************************************************/
#include "emu.h"
#include "machine/atarigen.h"
#include "video/atarimo.h"
#include "includes/thunderj.h"
/*************************************
*
* Tilemap callbacks
*
*************************************/
static TILE_GET_INFO( get_alpha_tile_info )
{
thunderj_state *state = machine.driver_data<thunderj_state>();
UINT16 data = state->m_alpha[tile_index];
int code = ((data & 0x200) ? (state->m_alpha_tile_bank * 0x200) : 0) + (data & 0x1ff);
int color = ((data >> 10) & 0x0f) | ((data >> 9) & 0x20);
int opaque = data & 0x8000;
SET_TILE_INFO(2, code, color, opaque ? TILE_FORCE_LAYER0 : 0);
}
static TILE_GET_INFO( get_playfield_tile_info )
{
thunderj_state *state = machine.driver_data<thunderj_state>();
UINT16 data1 = state->m_playfield[tile_index];
UINT16 data2 = state->m_playfield_upper[tile_index] & 0xff;
int code = data1 & 0x7fff;
int color = 0x10 + (data2 & 0x0f);
SET_TILE_INFO(0, code, color, (data1 >> 15) & 1);
tileinfo->category = (data2 >> 4) & 3;
}
static TILE_GET_INFO( get_playfield2_tile_info )
{
thunderj_state *state = machine.driver_data<thunderj_state>();
UINT16 data1 = state->m_playfield2[tile_index];
UINT16 data2 = state->m_playfield_upper[tile_index] >> 8;
int code = data1 & 0x7fff;
int color = data2 & 0x0f;
SET_TILE_INFO(0, code, color, (data1 >> 15) & 1);
tileinfo->category = (data2 >> 4) & 3;
}
/*************************************
*
* Video system start
*
*************************************/
VIDEO_START( thunderj )
{
static const atarimo_desc modesc =
{
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 }}, /* mask for the graphics bank */
{{ 0,0x7fff,0,0 }}, /* mask for the code index */
{{ 0 }}, /* mask for the upper 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" */
NULL /* callback routine for special entries */
};
thunderj_state *state = machine.driver_data<thunderj_state>();
/* initialize the playfield */
state->m_playfield_tilemap = tilemap_create(machine, get_playfield_tile_info, tilemap_scan_cols, 8,8, 64,64);
/* initialize the second playfield */
state->m_playfield2_tilemap = tilemap_create(machine, get_playfield2_tile_info, tilemap_scan_cols, 8,8, 64,64);
tilemap_set_transparent_pen(state->m_playfield2_tilemap, 0);
/* 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);
}
/*************************************
*
* Main refresh
*
*************************************/
SCREEN_UPDATE( thunderj )
{
thunderj_state *state = screen->machine().driver_data<thunderj_state>();
bitmap_t *priority_bitmap = screen->machine().priority_bitmap;
atarimo_rect_list rectlist;
bitmap_t *mobitmap;
int x, y, r;
/* draw the playfield */
bitmap_fill(priority_bitmap, cliprect, 0);
tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 0, 0x00);
tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 1, 0x01);
tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 2, 0x02);
tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 3, 0x03);
tilemap_draw(bitmap, cliprect, state->m_playfield2_tilemap, 0, 0x80);
tilemap_draw(bitmap, cliprect, state->m_playfield2_tilemap, 1, 0x84);
tilemap_draw(bitmap, cliprect, state->m_playfield2_tilemap, 2, 0x88);
tilemap_draw(bitmap, cliprect, state->m_playfield2_tilemap, 3, 0x8c);
/* 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;
UINT8 *pri = (UINT8 *)priority_bitmap->base + priority_bitmap->rowpixels * y;
for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++)
if (mo[x])
{
/* 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] >> ATARIMO_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] & 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);
}
/* erase behind ourselves */
mo[x] = 0;
}
}
return 0;
}