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AmigActive 10
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vidhrdw
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darkseal.c
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C/C++ Source or Header
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2000-04-08
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10KB
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381 lines
/***************************************************************************
Dark Seal Video emulation - Bryan McPhail, mish@tendril.co.uk
****************************************************************************
Data East custom chip 55: Generates two playfields, playfield 1 is underneath
playfield 2. Dark Seal uses two of these chips. 1 playfield is _always_ off
in this game.
16 bytes of control registers per chip.
Word 0:
Mask 0x0080: Flip screen
Mask 0x007f: ?
Word 2:
Mask 0xffff: Playfield 2 X scroll (top playfield)
Word 4:
Mask 0xffff: Playfield 2 Y scroll (top playfield)
Word 6:
Mask 0xffff: Playfield 1 X scroll (bottom playfield)
Word 8:
Mask 0xffff: Playfield 1 Y scroll (bottom playfield)
Word 0xa:
Mask 0xc000: Playfield 1 shape??
Mask 0x3000: Playfield 1 rowscroll style (maybe mask 0x3800??)
Mask 0x0300: Playfield 1 colscroll style (maybe mask 0x0700??)?
Mask 0x00c0: Playfield 2 shape??
Mask 0x0030: Playfield 2 rowscroll style (maybe mask 0x0038??)
Mask 0x0003: Playfield 2 colscroll style (maybe mask 0x0007??)?
Word 0xc:
Mask 0x8000: Playfield 1 is 8*8 tiles else 16*16
Mask 0x4000: Playfield 1 rowscroll enabled
Mask 0x2000: Playfield 1 colscroll enabled
Mask 0x1f00: ?
Mask 0x0080: Playfield 2 is 8*8 tiles else 16*16
Mask 0x0040: Playfield 2 rowscroll enabled
Mask 0x0020: Playfield 2 colscroll enabled
Mask 0x001f: ?
Word 0xe:
??
Locations 0 & 0xe are mostly unknown:
0 14
Caveman Ninja (bottom): 0053 1100 (changes to 1111 later)
Caveman Ninja (top): 0010 0081
Two Crude (bottom): 0053 0000
Two Crude (top): 0010 0041
Dark Seal (bottom): 0010 0000
Dark Seal (top): 0053 4101
Tumblepop: 0010 0000
Super Burger Time: 0010 0000
Location 0xe looks like it could be a mirror of another byte..
**************************************************************************
Sprites - Data East custom chip 52
8 bytes per sprite, unknowns bits seem unused.
Word 0:
Mask 0x8000 - ?
Mask 0x4000 - Y flip
Mask 0x2000 - X flip
Mask 0x1000 - Sprite flash
Mask 0x0800 - ?
Mask 0x0600 - Sprite height (1x, 2x, 4x, 8x)
Mask 0x01ff - Y coordinate
Word 2:
Mask 0xffff - Sprite number
Word 4:
Mask 0x8000 - ?
Mask 0x4000 - Sprite is drawn beneath top 8 pens of playfield 4
Mask 0x3e00 - Colour (32 palettes, most games only use 16)
Mask 0x01ff - X coordinate
Word 6:
Always unused.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *darkseal_pf12_row,*darkseal_pf34_row;
unsigned char *darkseal_pf1_data,*darkseal_pf2_data,*darkseal_pf3_data;
static unsigned char darkseal_control_0[16];
static unsigned char darkseal_control_1[16];
static struct tilemap *pf1_tilemap,*pf2_tilemap,*pf3_tilemap;
static unsigned char *gfx_base;
static int gfx_bank,flipscreen;
/***************************************************************************/
/* Function for all 16x16 1024x1024 layers */
static UINT32 darkseal_scan(UINT32 col,UINT32 row,UINT32 num_cols,UINT32 num_rows)
{
/* logical (col,row) -> memory offset */
return (col & 0x1f) + ((row & 0x1f) << 5) + ((col & 0x20) << 5) + ((row & 0x20) << 6);
}
static void get_bg_tile_info(int tile_index)
{
int tile,color;
tile=READ_WORD(&gfx_base[2*tile_index]);
color=tile >> 12;
tile=tile&0xfff;
SET_TILE_INFO(gfx_bank,tile,color)
}
static void get_fg_tile_info(int tile_index)
{
int tile=READ_WORD(&darkseal_pf1_data[2*tile_index]);
int color=tile >> 12;
tile=tile&0xfff;
SET_TILE_INFO(0,tile,color)
}
/******************************************************************************/
static void update_24bitcol(int offset)
{
int r,g,b;
r = (READ_WORD(&paletteram[offset]) >> 0) & 0xff;
g = (READ_WORD(&paletteram[offset]) >> 8) & 0xff;
b = (READ_WORD(&paletteram_2[offset]) >> 0) & 0xff;
palette_change_color(offset / 2,r,g,b);
}
WRITE_HANDLER( darkseal_palette_24bit_rg_w )
{
/* only 1280 out of 2048 colors are actually used */
if (offset >= 2*Machine->drv->total_colors) return;
COMBINE_WORD_MEM(&paletteram[offset],data);
update_24bitcol(offset);
}
WRITE_HANDLER( darkseal_palette_24bit_b_w )
{
/* only 1280 out of 2048 colors are actually used */
if (offset >= 2*Machine->drv->total_colors) return;
COMBINE_WORD_MEM(&paletteram_2[offset],data);
update_24bitcol(offset);
}
READ_HANDLER( darkseal_palette_24bit_rg_r )
{
return READ_WORD(&paletteram[offset]);
}
READ_HANDLER( darkseal_palette_24bit_b_r )
{
return READ_WORD(&paletteram_2[offset]);
}
/******************************************************************************/
static void darkseal_mark_sprite_colours(void)
{
int offs,color,i,pal_base,colmask[32];
palette_init_used_colors();
pal_base = Machine->drv->gfxdecodeinfo[3].color_codes_start;
for (color = 0;color < 32;color++) colmask[color] = 0;
for (offs = 0;offs < 0x800;offs += 8)
{
int x,y,sprite,multi;
sprite = READ_WORD (&buffered_spriteram[offs+2]) & 0x1fff;
if (!sprite) continue;
y = READ_WORD(&buffered_spriteram[offs]);
x = READ_WORD(&buffered_spriteram[offs+4]);
color = (x >> 9) &0x1f;
x = x & 0x01ff;
if (x >= 256) x -= 512;
x = 240 - x;
if (x>256) continue; /* Speedup */
multi = (1 << ((y & 0x0600) >> 9)) - 1; /* 1x, 2x, 4x, 8x height */
sprite &= ~multi;
while (multi >= 0)
{
colmask[color] |= Machine->gfx[3]->pen_usage[sprite + multi];
multi--;
}
}
for (color = 0;color < 32;color++)
{
for (i = 1;i < 16;i++)
{
if (colmask[color] & (1 << i))
palette_used_colors[pal_base + 16 * color + i] = PALETTE_COLOR_USED;
}
}
if (palette_recalc())
tilemap_mark_all_pixels_dirty(ALL_TILEMAPS);
}
static void darkseal_drawsprites(struct osd_bitmap *bitmap)
{
int offs;
for (offs = 0;offs < 0x800;offs += 8)
{
int x,y,sprite,colour,multi,fx,fy,inc,flash,mult;
sprite = READ_WORD (&buffered_spriteram[offs+2]) & 0x1fff;
if (!sprite) continue;
y = READ_WORD(&buffered_spriteram[offs]);
x = READ_WORD(&buffered_spriteram[offs+4]);
flash=y&0x1000;
if (flash && (cpu_getcurrentframe() & 1)) continue;
colour = (x >> 9) &0x1f;
fx = y & 0x2000;
fy = y & 0x4000;
multi = (1 << ((y & 0x0600) >> 9)) - 1; /* 1x, 2x, 4x, 8x height */
x = x & 0x01ff;
y = y & 0x01ff;
if (x >= 256) x -= 512;
if (y >= 256) y -= 512;
x = 240 - x;
y = 240 - y;
if (x>256) continue; /* Speedup */
sprite &= ~multi;
if (fy)
inc = -1;
else
{
sprite += multi;
inc = 1;
}
if (flipscreen)
{
y=240-y;
x=240-x;
if (fx) fx=0; else fx=1;
if (fy) fy=0; else fy=1;
mult=16;
}
else mult=-16;
while (multi >= 0)
{
drawgfx(bitmap,Machine->gfx[3],
sprite - multi * inc,
colour,
fx,fy,
x,y + mult * multi,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
multi--;
}
}
}
/******************************************************************************/
WRITE_HANDLER( darkseal_pf1_data_w )
{
COMBINE_WORD_MEM(&darkseal_pf1_data[offset],data);
tilemap_mark_tile_dirty(pf1_tilemap,offset/2);
}
WRITE_HANDLER( darkseal_pf2_data_w )
{
COMBINE_WORD_MEM(&darkseal_pf2_data[offset],data);
tilemap_mark_tile_dirty(pf2_tilemap,offset/2);
}
WRITE_HANDLER( darkseal_pf3_data_w )
{
COMBINE_WORD_MEM(&darkseal_pf3_data[offset],data);
tilemap_mark_tile_dirty(pf3_tilemap,offset/2);
}
WRITE_HANDLER( darkseal_pf3b_data_w ) /* Mirror */
{
darkseal_pf3_data_w(offset+0x1000,data);
}
WRITE_HANDLER( darkseal_control_0_w )
{
COMBINE_WORD_MEM(&darkseal_control_0[offset],data);
}
WRITE_HANDLER( darkseal_control_1_w )
{
COMBINE_WORD_MEM(&darkseal_control_1[offset],data);
}
/******************************************************************************/
int darkseal_vh_start(void)
{
pf1_tilemap = tilemap_create(get_fg_tile_info,tilemap_scan_rows,TILEMAP_TRANSPARENT, 8, 8,64,64);
pf2_tilemap = tilemap_create(get_bg_tile_info,darkseal_scan, TILEMAP_TRANSPARENT,16,16,64,64);
pf3_tilemap = tilemap_create(get_bg_tile_info,darkseal_scan, TILEMAP_OPAQUE, 16,16,64,64);
if (!pf1_tilemap || !pf2_tilemap || !pf3_tilemap)
return 1;
pf1_tilemap->transparent_pen = 0;
pf2_tilemap->transparent_pen = 0;
return 0;
}
/******************************************************************************/
void darkseal_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
flipscreen=!(READ_WORD(&darkseal_control_0[0])&0x80);
tilemap_set_flip(ALL_TILEMAPS,flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0);
/* Update scroll registers */
tilemap_set_scrollx( pf1_tilemap,0, READ_WORD(&darkseal_control_1[6]) );
tilemap_set_scrolly( pf1_tilemap,0, READ_WORD(&darkseal_control_1[8]) );
tilemap_set_scrollx( pf2_tilemap,0, READ_WORD(&darkseal_control_1[2]) );
tilemap_set_scrolly( pf2_tilemap,0, READ_WORD(&darkseal_control_1[4]) );
if (READ_WORD(&darkseal_control_0[0xc])&0x4000) { /* Rowscroll enable */
int offs,scrollx=READ_WORD(&darkseal_control_0[6]);
tilemap_set_scroll_rows(pf3_tilemap,512);
for (offs = 0;offs < 512;offs++)
tilemap_set_scrollx( pf3_tilemap,offs, scrollx + READ_WORD(&darkseal_pf34_row[(offs<<1)+0x80]) );
}
else {
tilemap_set_scroll_rows(pf3_tilemap,1);
tilemap_set_scrollx( pf3_tilemap,0, READ_WORD(&darkseal_control_0[6]) );
}
tilemap_set_scrolly( pf3_tilemap,0, READ_WORD(&darkseal_control_0[8]) );
gfx_bank=1;
gfx_base=darkseal_pf2_data;
tilemap_update(pf2_tilemap);
gfx_bank=2;
gfx_base=darkseal_pf3_data;
tilemap_update(pf3_tilemap);
tilemap_update(pf1_tilemap);
darkseal_mark_sprite_colours();
tilemap_render(ALL_TILEMAPS);
tilemap_draw(bitmap,pf3_tilemap,0);
tilemap_draw(bitmap,pf2_tilemap,0);
darkseal_drawsprites(bitmap);
tilemap_draw(bitmap,pf1_tilemap,0);
}
/******************************************************************************/