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vidhrdw
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cyberbal.c
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C/C++ Source or Header
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2000-04-04
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/***************************************************************************
vidhrdw/cyberbal.c
Functions to emulate the video hardware of the machine.
****************************************************************************
Playfield encoding
------------------
1 16-bit word is used
Word 1:
Bit 15 = horizontal flip
Bits 11-14 = palette
Bits 0-12 = image index
Motion Object encoding
----------------------
4 16-bit words are used
Word 1:
Bit 15 = horizontal flip
Bits 0-14 = image index
Word 2:
Bits 7-15 = Y position
Bits 0-3 = height in tiles
Word 3:
Bits 3-10 = link to the next image to display
Word 4:
Bits 6-14 = X position
Bit 4 = use current X position + 16 for next sprite
Bits 0-3 = palette
Alpha layer encoding
--------------------
1 16-bit word is used
Word 1:
Bit 15 = horizontal flip
Bit 12-14 = palette
Bits 0-11 = image index
***************************************************************************/
#include "driver.h"
#include "machine/atarigen.h"
#include "vidhrdw/generic.h"
#define XCHARS 42
#define YCHARS 30
#define XDIM (XCHARS*16)
#define YDIM (YCHARS*8)
/*************************************
*
* Structures
*
*************************************/
struct mo_params
{
int xhold;
struct osd_bitmap *bitmap;
};
/*************************************
*
* Globals we own
*
*************************************/
UINT8 *cyberbal_playfieldram_1;
UINT8 *cyberbal_playfieldram_2;
/*************************************
*
* Statics
*
*************************************/
static struct atarigen_pf_state pf_state;
static UINT8 current_slip;
static UINT8 *active_palette;
/*************************************
*
* Prototypes
*
*************************************/
static const UINT8 *update_palette(void);
static void pf_color_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *data);
static void pf_render_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *data);
static void mo_color_callback(const UINT16 *data, const struct rectangle *clip, void *param);
static void mo_render_callback(const UINT16 *data, const struct rectangle *clip, void *param);
/*************************************
*
* Video system start
*
*************************************/
int cyberbal_vh_start(void)
{
static struct atarigen_mo_desc mo_desc =
{
256, /* maximum number of MO's */
8, /* number of bytes per MO entry */
2, /* number of bytes between MO words */
0, /* ignore an entry if this word == 0xffff */
2, 3, 0xff, /* link = (data[linkword] >> linkshift) & linkmask */
0 /* reverse order */
};
static struct atarigen_pf_desc pf_desc =
{
16, 8, /* width/height of each tile */
64, 64 /* number of tiles in each direction */
};
/* reset statics */
memset(&pf_state, 0, sizeof(pf_state));
current_slip = 0;
/* initialize the playfield */
if (atarigen_pf_init(&pf_desc))
return 1;
/* initialize the motion objects */
if (atarigen_mo_init(&mo_desc))
{
atarigen_pf_free();
return 1;
}
return 0;
}
/*************************************
*
* Video system shutdown
*
*************************************/
void cyberbal_vh_stop(void)
{
atarigen_pf_free();
atarigen_mo_free();
}
/*************************************
*
* Palette tweaker
*
*************************************/
INLINE void set_palette_entry(int entry, UINT16 value)
{
int r, g, b;
r = ((value >> 9) & 0x3e) | ((value >> 15) & 1);
g = ((value >> 4) & 0x3e) | ((value >> 15) & 1);
b = ((value << 1) & 0x3e) | ((value >> 15) & 1);
r = (r << 2) | (r >> 4);
g = (g << 2) | (g >> 4);
b = (b << 2) | (b >> 4);
palette_change_color(entry, r, g, b);
}
/*************************************
*
* Screen switcher
*
*************************************/
void cyberbal_set_screen(int which)
{
int i;
/* update the video memory areas */
atarigen_playfieldram = which ? cyberbal_playfieldram_2 : cyberbal_playfieldram_1;
atarigen_playfieldram_size = 0x2000;
atarigen_alpharam = atarigen_playfieldram + atarigen_playfieldram_size;
atarigen_alpharam_size = 0x1000;
atarigen_spriteram = atarigen_alpharam + atarigen_alpharam_size;
atarigen_spriteram_size = 0x1000;
/* pick the active palette */
active_palette = which ? paletteram_2 : paletteram;
/* re-init the palette */
for (i = 0; i < 2048; i++)
set_palette_entry(i, READ_WORD(&active_palette[i * 2]));
/* invalidate the screen */
memset(atarigen_pf_dirty, 0xff, atarigen_playfieldram_size / 2);
}
/*************************************
*
* Playfield RAM write handlers
*
*************************************/
WRITE_HANDLER( cyberbal_playfieldram_1_w )
{
int oldword = READ_WORD(&cyberbal_playfieldram_1[offset]);
int newword = COMBINE_WORD(oldword, data);
if (oldword != newword)
{
WRITE_WORD(&cyberbal_playfieldram_1[offset], newword);
if (cyberbal_playfieldram_1 == atarigen_playfieldram)
atarigen_pf_dirty[offset / 2] = 0xff;
}
}
WRITE_HANDLER( cyberbal_playfieldram_2_w )
{
int oldword = READ_WORD(&cyberbal_playfieldram_2[offset]);
int newword = COMBINE_WORD(oldword, data);
if (oldword != newword)
{
WRITE_WORD(&cyberbal_playfieldram_2[offset], newword);
if (cyberbal_playfieldram_2 == atarigen_playfieldram)
atarigen_pf_dirty[offset / 2] = 0xff;
}
}
/*************************************
*
* Palette RAM write handlers
*
*************************************/
WRITE_HANDLER( cyberbal_paletteram_1_w )
{
int oldword = READ_WORD(&paletteram[offset]);
int newword = COMBINE_WORD(oldword, data);
if (oldword != newword)
{
WRITE_WORD(&paletteram[offset], newword);
if (paletteram == active_palette)
set_palette_entry(offset / 2, newword);
}
}
READ_HANDLER( cyberbal_paletteram_1_r )
{
return READ_WORD(&paletteram[offset]);
}
WRITE_HANDLER( cyberbal_paletteram_2_w )
{
int oldword = READ_WORD(&paletteram_2[offset]);
int newword = COMBINE_WORD(oldword, data);
if (oldword != newword)
{
WRITE_WORD(&paletteram_2[offset], newword);
if (paletteram_2 == active_palette)
set_palette_entry(offset / 2, newword);
}
}
READ_HANDLER( cyberbal_paletteram_2_r )
{
return READ_WORD(&paletteram_2[offset]);
}
/*************************************
*
* Periodic scanline updater
*
*************************************/
void cyberbal_scanline_update(int scanline)
{
UINT16 *base = (UINT16 *)&atarigen_alpharam[((scanline / 8) * 64 + 47) * 2];
/* keep in range */
if ((UINT8 *)base >= &atarigen_alpharam[atarigen_alpharam_size])
return;
/* update the playfield with the previous parameters */
atarigen_pf_update(&pf_state, scanline);
/* update the MOs with the previous parameters */
atarigen_mo_update(atarigen_spriteram, current_slip, scanline);
/* update the current parameters */
if (!(base[3] & 1))
pf_state.param[0] = (base[3] >> 1) & 7;
if (!(base[4] & 1))
pf_state.hscroll = 2 * (((base[4] >> 7) + 4) & 0x1ff);
if (!(base[5] & 1))
{
/* a new vscroll latches the offset into a counter; we must adjust for this */
int offset = scanline + 8;
if (offset >= 256)
offset -= 256;
pf_state.vscroll = ((base[5] >> 7) - offset) & 0x1ff;
}
if (!(base[6] & 1))
pf_state.param[1] = (base[6] >> 1) & 0xff;
if (!(base[7] & 1))
current_slip = (base[7] >> 3) & 0xff;
}
/*************************************
*
* Main refresh
*
*************************************/
void cyberbal_vh_screenrefresh(struct osd_bitmap *bitmap, int full_refresh)
{
struct mo_params modata;
const struct GfxElement *gfx;
int x, y, offs;
/* update the palette, and mark things dirty */
if (update_palette())
memset(atarigen_pf_dirty, 0xff, atarigen_playfieldram_size / 2);
/* draw the playfield */
memset(atarigen_pf_visit, 0, 64*64);
atarigen_pf_process(pf_render_callback, bitmap, &Machine->drv->visible_area);
/* draw the motion objects */
modata.xhold = 1000;
modata.bitmap = bitmap;
atarigen_mo_process(mo_render_callback, &modata);
/* draw the alphanumerics */
gfx = Machine->gfx[2];
for (y = 0; y < YCHARS; y++)
for (x = 0, offs = y * 64; x < XCHARS; x++, offs++)
{
int data = READ_WORD(&atarigen_alpharam[offs * 2]);
int code = data & 0xfff;
int hflip = data & 0x8000;
int color = (data >> 12) & 7;
drawgfx(bitmap, gfx, code, color, hflip, 0, 16 * x, 8 * y, 0, TRANSPARENCY_PEN, 0);
}
/* update onscreen messages */
atarigen_update_messages();
}
/*************************************
*
* Palette management
*
*************************************/
static const UINT8 *update_palette(void)
{
UINT16 pf_map[16 * 8], mo_map[16], al_map[8];
const unsigned int *usage;
int i, j, x, y, offs;
/* reset color tracking */
memset(mo_map, 0, sizeof(mo_map));
memset(pf_map, 0, sizeof(pf_map));
memset(al_map, 0, sizeof(al_map));
palette_init_used_colors();
/* update color usage for the playfield */
atarigen_pf_process(pf_color_callback, pf_map, &Machine->drv->visible_area);
/* update color usage for the mo's */
atarigen_mo_process(mo_color_callback, mo_map);
/* update color usage for the alphanumerics */
usage = Machine->gfx[2]->pen_usage;
for (y = 0; y < YCHARS; y++)
for (x = 0, offs = y * 64; x < XCHARS; x++, offs++)
{
int data = READ_WORD(&atarigen_alpharam[offs * 2]);
int code = data & 0xfff;
int color = (data >> 12) & 7;
al_map[color] |= usage[code];
}
/* rebuild the playfield palette */
for (i = 0; i < 16 * 8; i++)
{
UINT16 used = pf_map[i];
if (used)
for (j = 0; j < 16; j++)
if (used & (1 << j))
palette_used_colors[i * 16 + j] = PALETTE_COLOR_USED;
}
/* rebuild the motion object palette */
for (i = 0; i < 16; i++)
{
UINT16 used = mo_map[i];
if (used)
{
palette_used_colors[0x600 + i * 16 + 0] = PALETTE_COLOR_TRANSPARENT;
for (j = 1; j < 16; j++)
if (used & (1 << j))
palette_used_colors[0x600 + i * 16 + j] = PALETTE_COLOR_USED;
}
}
/* rebuild the alphanumerics palette */
for (i = 0; i < 8; i++)
{
UINT16 used = al_map[i];
if (used)
{
palette_used_colors[0x780 + i * 16 + 0] = PALETTE_COLOR_TRANSPARENT;
for (j = 1; j < 16; j++)
if (used & (1 << j))
palette_used_colors[0x780 + i * 16 + j] = PALETTE_COLOR_USED;
}
}
/* recalc */
return palette_recalc();
}
/*************************************
*
* Playfield palette
*
*************************************/
static void pf_color_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param)
{
UINT16 *colormap = (UINT16 *)param + 16 * state->param[0];
const unsigned int *usage = Machine->gfx[0]->pen_usage;
int x, y;
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
{
int offs = y * 64 + x;
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int code = data & 0x1fff;
int color = (data >> 11) & 15;
colormap[color] |= usage[code];
/* also mark unvisited tiles dirty */
if (!atarigen_pf_visit[offs]) atarigen_pf_dirty[offs] = 0xff;
}
}
/*************************************
*
* Playfield rendering
*
*************************************/
static void pf_render_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param)
{
const struct GfxElement *gfx = Machine->gfx[0];
int colorbase = 16 * state->param[0];
struct osd_bitmap *bitmap = param;
int x, y;
/* first update any tiles whose color is out of date */
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
{
int offs = y * 64 + x;
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int color = colorbase + ((data >> 11) & 15);
if (atarigen_pf_dirty[offs] != color)
{
int code = data & 0x1fff;
int hflip = data & 0x8000;
drawgfx(atarigen_pf_bitmap, gfx, code, color, hflip, 0, 16 * x, 8 * y, 0, TRANSPARENCY_NONE, 0);
atarigen_pf_dirty[offs] = color;
}
/* track the tiles we've visited */
atarigen_pf_visit[offs] = 1;
}
/* then blast the result */
x = -state->hscroll;
y = -state->vscroll;
copyscrollbitmap(bitmap, atarigen_pf_bitmap, 1, &x, 1, &y, clip, TRANSPARENCY_NONE, 0);
}
/*************************************
*
* Motion object palette
*
*************************************/
static void mo_color_callback(const UINT16 *data, const struct rectangle *clip, void *param)
{
const unsigned int *usage = Machine->gfx[1]->pen_usage;
UINT16 *colormap = param;
UINT16 temp = 0;
int y;
int code = data[0] & 0x7fff;
int vsize = (data[1] & 15) + 1;
int color = data[3] & 0x0f;
for (y = 0; y < vsize; y++)
temp |= usage[code++];
colormap[color] |= temp;
}
/*************************************
*
* Motion object rendering
*
*************************************/
static void mo_render_callback(const UINT16 *data, const struct rectangle *clip, void *param)
{
const struct GfxElement *gfx = Machine->gfx[1];
struct mo_params *modata = param;
struct osd_bitmap *bitmap = modata->bitmap;
/* extract data from the various words */
int hflip = data[0] & 0x8000;
int code = data[0] & 0x7fff;
int ypos = -(data[1] >> 7);
int vsize = (data[1] & 0x000f) + 1;
int xpos = (data[3] >> 6) - 4;
int hold_next = data[3] & 0x0010;
int color = data[3] & 0x000f;
/* adjust for height */
ypos -= vsize * 8;
/* if we've got a hold position from the last MO, use that */
if (modata->xhold != 1000)
xpos = modata->xhold;
/* if we've got a hold position for the next MO, set it now */
if (hold_next)
modata->xhold = xpos + 16;
else
modata->xhold = 1000;
/* adjust the final coordinates */
xpos &= 0x3ff;
ypos &= 0x1ff;
if (xpos >= XDIM) xpos -= 0x400;
if (ypos >= YDIM) ypos -= 0x200;
/* draw the motion object */
atarigen_mo_draw_16x8_strip(bitmap, gfx, code, color, hflip, 0, xpos, ypos, vsize, clip, TRANSPARENCY_PEN, 0);
}