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vidhrdw
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gauntlet.c
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C/C++ Source or Header
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2000-05-18
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14KB
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530 lines
/***************************************************************************
Atari Gauntlet hardware
****************************************************************************/
#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)
/*************************************
*
* Globals we own
*
*************************************/
UINT8 vindctr2_screen_refresh;
/*************************************
*
* Statics
*
*************************************/
struct mo_data
{
struct osd_bitmap *bitmap;
UINT8 color_xor;
};
static struct atarigen_pf_state pf_state;
static UINT8 playfield_color_base;
/*************************************
*
* 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_overrender_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param);
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 gauntlet_vh_start(void)
{
static struct atarigen_mo_desc mo_desc =
{
1024, /* maximum number of MO's */
2, /* number of bytes per MO entry */
0x800, /* number of bytes between MO words */
3, /* ignore an entry if this word == 0xffff */
3, 0, 0x3ff, /* 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 */
};
/* reset statics */
memset(&pf_state, 0, sizeof(pf_state));
playfield_color_base = vindctr2_screen_refresh ? 0x10 : 0x18;
/* 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 gauntlet_vh_stop(void)
{
atarigen_pf_free();
atarigen_mo_free();
}
/*************************************
*
* Horizontal scroll register
*
*************************************/
WRITE_HANDLER( gauntlet_hscroll_w )
{
/* update memory */
int oldword = READ_WORD(&atarigen_hscroll[offset]);
int newword = COMBINE_WORD(oldword, data);
WRITE_WORD(&atarigen_hscroll[offset], newword);
/* update parameters */
pf_state.hscroll = newword & 0x1ff;
atarigen_pf_update(&pf_state, cpu_getscanline());
}
/*************************************
*
* Vertical scroll/PF bank register
*
*************************************/
WRITE_HANDLER( gauntlet_vscroll_w )
{
/* update memory */
int oldword = READ_WORD(&atarigen_vscroll[offset]);
int newword = COMBINE_WORD(oldword, data);
WRITE_WORD(&atarigen_vscroll[offset], newword);
/* update parameters */
pf_state.vscroll = (newword >> 7) & 0x1ff;
pf_state.param[0] = newword & 3;
atarigen_pf_update(&pf_state, cpu_getscanline());
}
/*************************************
*
* Playfield RAM write handler
*
*************************************/
WRITE_HANDLER( gauntlet_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] = 0xff;
}
}
/*************************************
*
* Periodic scanline updater
*
*************************************/
void gauntlet_scanline_update(int scanline)
{
atarigen_mo_update_slip_512(atarigen_spriteram, pf_state.vscroll, scanline, &atarigen_alpharam[0xf80]);
}
/*************************************
*
* Main refresh
*
*************************************/
void gauntlet_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
/* 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 */
atarigen_mo_process(mo_render_callback, bitmap);
/* draw the alphanumerics */
{
const struct GfxElement *gfx = Machine->gfx[1];
int x, y, offs;
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 & 0x3ff;
int opaque = data & 0x8000;
if (code || opaque)
{
int color = ((data >> 10) & 0xf) | ((data >> 9) & 0x20);
drawgfx(bitmap, gfx, code, color, 0, 0, 8 * x, 8 * y, 0, opaque ? TRANSPARENCY_NONE : TRANSPARENCY_PEN, 0);
}
}
}
/* update onscreen messages */
atarigen_update_messages();
}
/*************************************
*
* Palette management
*
*************************************/
static const UINT8 *update_palette(void)
{
UINT16 pf_map[32], al_map[64], mo_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[1]->pen_usage;
int x, y, offs;
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 & 0x3ff;
int color = ((data >> 10) & 0xf) | ((data >> 9) & 0x20);
al_map[color] |= usage[code];
}
}
/* rebuild the playfield palette */
for (i = 0; i < 16; i++)
{
UINT16 used = pf_map[i + 16];
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 < 16; i++)
{
UINT16 used = mo_map[i];
if (used)
{
palette_used_colors[0x100 + i * 16 + 0] = PALETTE_COLOR_TRANSPARENT;
palette_used_colors[0x100 + i * 16 + 1] = PALETTE_COLOR_TRANSPARENT;
for (j = 2; 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 < 64; 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;
}
/* 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)
{
const unsigned int *usage = &Machine->gfx[0]->pen_usage[state->param[0] * 0x1000];
UINT16 *colormap = (UINT16 *)param;
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 = x * 64 + y;
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int code = (data & 0xfff) ^ 0x800;
int color = playfield_color_base + ((data >> 12) & 7);
colormap[color] |= usage[code];
colormap[color ^ 8] |= 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];
struct osd_bitmap *bitmap = param;
int bank = state->param[0];
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 = x * 64 + y;
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
if (atarigen_pf_dirty[offs] != bank)
{
int color = playfield_color_base + ((data >> 12) & 7);
int code = bank * 0x1000 + ((data & 0xfff) ^ 0x800);
int hflip = data & 0x8000;
drawgfx(atarigen_pf_bitmap, gfx, code, color, hflip, 0, 8 * x, 8 * y, 0, TRANSPARENCY_NONE, 0);
atarigen_pf_dirty[offs] = bank;
}
/* 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);
}
/*************************************
*
* 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 GfxElement *gfx = Machine->gfx[0];
const struct mo_data *modata = param;
struct osd_bitmap *bitmap = modata->bitmap;
int color_xor = modata->color_xor;
int bank = state->param[0];
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)
{
int sy = (8 * y - state->vscroll) & 0x1ff;
if (sy >= YDIM) sy -= 0x200;
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
{
int offs = x * 64 + y;
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int color = playfield_color_base + ((data >> 12) & 7);
int code = bank * 0x1000 + ((data & 0xfff) ^ 0x800);
int hflip = data & 0x8000;
int sx = (8 * x - state->hscroll) & 0x1ff;
if (sx >= XDIM) sx -= 0x200;
drawgfx(bitmap, gfx, code, color ^ color_xor, hflip, 0, sx, sy, 0, TRANSPARENCY_THROUGH, palette_transparent_pen);
}
}
}
/*************************************
*
* Motion object palette
*
*************************************/
static void mo_color_callback(const UINT16 *data, const struct rectangle *clip, void *param)
{
const unsigned int *usage = Machine->gfx[0]->pen_usage;
UINT16 *colormap = param;
int code = (data[0] & 0x7fff) ^ 0x800;
int hsize = ((data[2] >> 3) & 7) + 1;
int vsize = (data[2] & 7) + 1;
int color = data[1] & 0x000f;
int tiles = hsize * vsize;
UINT16 temp = 0;
int i;
for (i = 0; i < tiles; i++)
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[0];
const unsigned int *usage = gfx->pen_usage;
unsigned int total_usage = 0;
struct osd_bitmap *bitmap = param;
struct rectangle pf_clip;
int x, y, sx, sy;
/* extract data from the various words */
int code = (data[0] & 0x7fff) ^ 0x800;
int color = data[1] & 0x000f;
int ypos = -pf_state.vscroll - (data[2] >> 7);
int hflip = data[2] & 0x0040;
int hsize = ((data[2] >> 3) & 7) + 1;
int vsize = (data[2] & 7) + 1;
int xpos = -pf_state.hscroll + (data[1] >> 7);
int xadv;
/* adjust for height */
ypos -= vsize * 8;
/* adjust the final coordinates */
xpos &= 0x1ff;
ypos &= 0x1ff;
if (xpos >= XDIM) xpos -= 0x200;
if (ypos >= YDIM) ypos -= 0x200;
/* determine the bounding box */
atarigen_mo_compute_clip_8x8(pf_clip, xpos, ypos, hsize, vsize, clip);
/* adjust for h flip */
if (hflip)
xpos += (hsize - 1) * 8, xadv = -8;
else
xadv = 8;
/* loop over the height */
for (y = 0, sy = ypos; y < vsize; y++, sy += 8)
{
/* clip the Y coordinate */
if (sy <= clip->min_y - 8)
{
code += hsize;
continue;
}
else if (sy > clip->max_y)
break;
/* loop over the width */
for (x = 0, sx = xpos; x < hsize; x++, sx += xadv, code++)
{
/* clip the X coordinate */
if (sx <= -8 || sx >= XDIM)
continue;
/* draw the sprite */
drawgfx(bitmap, gfx, code, color, hflip, 0, sx, sy, clip, TRANSPARENCY_PEN, 0);
total_usage |= usage[code];
}
}
/* overrender the playfield */
if (total_usage & 0x0002)
{
struct mo_data modata;
modata.bitmap = bitmap;
modata.color_xor = (color == 0 && vindctr2_screen_refresh) ? 0 : 8;
atarigen_pf_process(pf_overrender_callback, &modata, &pf_clip);
}
}