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vidhrdw
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xybots.c
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2000-04-04
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/***************************************************************************
vidhrdw/xybots.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 12-14 = color
Bits 0-11 = image
Motion Object encoding
----------------------
4 16-bit words are used
Word 1:
Bits 0-13 = index of the image (0-16384)
Bit 15 = horizontal flip
Word 2:
Bits 0-3 = priority
Word 3:
Bits 0-2 = height of the sprite / 8 (ranges from 1-8)
Bits 7-14 = Y position of the sprite
Word 4:
Bits 0-3 = image palette
Bits 7-14 = X position of the sprite
Alpha layer encoding
--------------------
1 16-bit word is used
Word 1:
Bit 15 = transparent/opaque
Bit 10-13 = color
Bits 0-9 = index of the character
***************************************************************************/
#include "driver.h"
#include "machine/atarigen.h"
#include "vidhrdw/generic.h"
#define XCHARS 42
#define YCHARS 30
#define XDIM (XCHARS*8)
#define YDIM (YCHARS*8)
/*************************************
*
* Structures
*
*************************************/
struct pf_overrender_data
{
struct osd_bitmap *bitmap;
int mo_priority;
};
/*************************************
*
* 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 pf_check_overrender_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *data);
static void pf_overrender_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 xybots_vh_start(void)
{
static struct atarigen_mo_desc mo_desc =
{
64, /* 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 */
-1, 0, 0x3f, /* link = (data[linkword] >> linkshift) & linkmask */
0 /* render in reverse link order */
};
static struct atarigen_pf_desc pf_desc =
{
8, 8, /* width/height of each tile */
64, 64, /* number of tiles in each direction */
1 /* non-scrolling */
};
/* 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 xybots_vh_stop(void)
{
atarigen_pf_free();
atarigen_mo_free();
}
/*************************************
*
* Playfield RAM write handler
*
*************************************/
WRITE_HANDLER( xybots_playfieldram_w )
{
int oldword = READ_WORD(&atarigen_playfieldram[offset]);
int newword = COMBINE_WORD(oldword, data);
if (oldword != newword)
{
WRITE_WORD(&atarigen_playfieldram[offset], newword);
atarigen_pf_dirty[offset / 2] = 1;
}
}
/*************************************
*
* Periodic scanline updater
*
*************************************/
void xybots_scanline_update(int scanline)
{
if (scanline < YDIM)
atarigen_mo_update(atarigen_spriteram, 0, scanline);
}
/*************************************
*
* Main refresh
*
*************************************/
void xybots_vh_screenrefresh(struct osd_bitmap *bitmap, int full_refresh)
{
int i;
/* update the palette */
if (update_palette())
memset(atarigen_pf_dirty, 1, atarigen_playfieldram_size / 2);
/* set up the all-transparent overrender palette */
for (i = 0; i < 16; i++)
atarigen_overrender_colortable[i] = palette_transparent_pen;
/* render the playfield */
atarigen_pf_process(pf_render_callback, bitmap, &Machine->drv->visible_area);
/* render the motion objects */
atarigen_mo_process(mo_render_callback, bitmap);
/* redraw the alpha layer completely */
{
const struct GfxElement *gfx = Machine->gfx[2];
int sx, sy, offs;
for (sy = 0; sy < YCHARS; sy++)
for (sx = 0, offs = sy * 64; sx < XCHARS; sx++, offs++)
{
int data = READ_WORD(&atarigen_alpharam[offs * 2]);
int code = data & 0x3ff;
int opaque = data & 0x8000;
if (code || opaque)
{
int color = (data >> 12) & 7;
drawgfx(bitmap, gfx, code, color, 0, 0, 8 * sx, 8 * sy, 0,
opaque ? TRANSPARENCY_NONE : TRANSPARENCY_PEN, 0);
}
}
}
/* update onscreen messages */
atarigen_update_messages();
}
/*************************************
*
* Palette management
*
*************************************/
static const UINT8 *update_palette(void)
{
UINT16 mo_map[48], al_map[8], pf_map[16];
int i, j;
/* 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 */
{
const unsigned int *usage = Machine->gfx[2]->pen_usage;
int sx, sy, offs;
for (sy = 0; sy < YCHARS; sy++)
for (sx = 0, offs = sy * 64; sx < XCHARS; sx++, offs++)
{
int data = READ_WORD(&atarigen_alpharam[offs * 2]);
int color = (data >> 12) & 7;
int code = data & 0x3ff;
al_map[color] |= usage[code];
}
}
/* rebuild the playfield palette */
for (i = 0; i < 16; i++)
{
UINT16 used = pf_map[i];
if (used)
for (j = 0; j < 16; j++)
if (used & (1 << j))
palette_used_colors[0x200 + i * 16 + j] = PALETTE_COLOR_USED;
}
/* rebuild the motion object palette */
for (i = 0; i < 48; i++)
{
UINT16 used = mo_map[i];
if (used)
{
palette_used_colors[0x100 + i * 16 + 0] = PALETTE_COLOR_TRANSPARENT;
for (j = 1; j < 16; j++)
if (used & (1 << j))
palette_used_colors[0x100 + i * 16 + j] = PALETTE_COLOR_USED;
}
}
/* rebuild the alphanumerics palette */
for (i = 0; i < 8; i++)
{
UINT16 used = al_map[i];
if (used)
for (j = 0; j < 4; j++)
if (used & (1 << j))
palette_used_colors[0x000 + i * 4 + j] = PALETTE_COLOR_USED;
}
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)
{
const unsigned int *usage = Machine->gfx[0]->pen_usage;
UINT16 *colormap = param;
int x, y;
/* standard loop over tiles */
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
{
int offs = y * 64 + x;
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int color = (data >> 11) & 15;
int code = data & 0x1fff;
/* mark the colors used by this tile */
colormap[color] |= usage[code];
}
}
/*************************************
*
* 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];
struct osd_bitmap *bitmap = param;
int x, y;
/* standard loop over tiles */
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
{
int offs = y * 64 + x;
/* update only if dirty */
if (atarigen_pf_dirty[offs])
{
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int color = (data >> 11) & 15;
int hflip = data & 0x8000;
int code = data & 0x1fff;
drawgfx(atarigen_pf_bitmap, gfx, code, color, hflip, 0, 8 * x, 8 * y, 0, TRANSPARENCY_NONE, 0);
atarigen_pf_dirty[offs] = 0;
}
}
/* then blast the result */
copybitmap(bitmap, atarigen_pf_bitmap, 0, 0, 0, 0, clip, TRANSPARENCY_NONE, 0);
}
/*************************************
*
* Playfield overrender check
*
*************************************/
static void pf_check_overrender_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param)
{
struct pf_overrender_data *overrender_data = param;
int mo_priority = overrender_data->mo_priority;
int x, y;
/* if we've already decided, bail */
if (mo_priority == -1)
return;
/* standard loop over tiles */
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
{
int offs = y * 64 + x;
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int color = (data >> 11) & 15;
/* this is the priority equation from the schematics */
if (mo_priority > color)
{
overrender_data->mo_priority = -1;
return;
}
}
}
/*************************************
*
* Playfield overrendering
*
*************************************/
static void pf_overrender_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param)
{
const struct pf_overrender_data *overrender_data = param;
const struct GfxElement *gfx = Machine->gfx[0];
struct osd_bitmap *bitmap = overrender_data->bitmap;
int mo_priority = overrender_data->mo_priority;
int x, y;
/* standard loop over tiles */
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
{
int offs = y * 64 + x;
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int color = (data >> 11) & 15;
/* this is the priority equation from the schematics */
if (mo_priority > color)
{
int hflip = data & 0x8000;
int code = data & 0x1fff;
drawgfx(bitmap, gfx, code, color, hflip, 0, 8 * x, 8 * 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;
int code = data[0] & 0x3fff;
int color = data[3] & 7;
int vsize = (data[2] & 7) + 1;
UINT16 temp = 0;
int i;
/* sneaky -- an extra color bank is hidden after the playfield palette */
if (data[3] & 8) color = 0x20 + (color ^ 7);
for (i = 0; i < vsize; i++)
temp |= usage[code++];
colormap[color] |= temp;
}
/*************************************
*
* Motion object rendering
*
*************************************/
static void mo_render_callback(const UINT16 *data, const struct rectangle *clip, void *param)
{
struct GfxElement *gfx = Machine->gfx[1];
struct pf_overrender_data overrender_data;
struct osd_bitmap *bitmap = param;
struct rectangle pf_clip;
/* extract data from the various words */
int code = data[0] & 0x3fff;
int hflip = data[0] & 0x8000;
int priority = ~data[1] & 15;
int vsize = (data[2] & 7) + 1;
int ypos = -(data[2] >> 7);
int color = data[3] & 7;
int xpos = data[3] >> 7;
/* sneaky -- an extra color bank is hidden after the playfield palette */
if (data[3] & 8) color = 0x20 + (color ^ 7);
/* adjust for the height */
ypos -= vsize * 8;
/* adjust the final coordinates */
xpos &= 0x1ff;
ypos &= 0x1ff;
if (xpos >= XDIM) xpos -= 0x200;
if (ypos >= YDIM) ypos -= 0x200;
/* clip the X coordinate */
if (xpos <= -8 || xpos >= XDIM)
return;
/* determine the bounding box */
atarigen_mo_compute_clip_8x8(pf_clip, xpos, ypos, 1, vsize, clip);
/* see if we need to overrender */
overrender_data.mo_priority = priority;
atarigen_pf_process(pf_check_overrender_callback, &overrender_data, &pf_clip);
/* if not, do it the easy way */
if (overrender_data.mo_priority == priority)
{
atarigen_mo_draw_8x8_strip(bitmap, gfx, code, color, hflip, 0, xpos, ypos, vsize, clip, TRANSPARENCY_PEN, 0);
}
/* otherwise, make it tricky */
else
{
/* draw an instance of the object in all transparent pens */
atarigen_mo_draw_transparent_8x8_strip(bitmap, gfx, code, hflip, 0, xpos, ypos, vsize, clip, TRANSPARENCY_PEN, 0);
/* and then draw it normally on the temp bitmap */
atarigen_mo_draw_8x8_strip(atarigen_pf_overrender_bitmap, gfx, code, color, hflip, 0, xpos, ypos, vsize, clip, TRANSPARENCY_NONE, 0);
/* overrender the playfield on top of that that */
overrender_data.mo_priority = priority;
overrender_data.bitmap = atarigen_pf_overrender_bitmap;
atarigen_pf_process(pf_overrender_callback, &overrender_data, &pf_clip);
/* finally, copy this chunk to the real bitmap */
copybitmap(bitmap, atarigen_pf_overrender_bitmap, 0, 0, 0, 0, &pf_clip, TRANSPARENCY_THROUGH, palette_transparent_pen);
}
}