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AmigActive 10
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vidhrdw
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tumblep.c
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C/C++ Source or Header
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2000-04-11
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7KB
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268 lines
/***************************************************************************
Tumblepop Video emulation - Bryan McPhail, mish@tendril.co.uk
*********************************************************************
Uses Data East custom chip 55 for backgrounds, custom chip 52 for sprites.
See Dark Seal & Caveman Ninja drivers for info on these chips.
Tumblepop is one of few games to take advantage of the playfields ability
to switch between 8*8 tiles and 16*16 tiles.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
static unsigned char tumblep_control_0[16];
unsigned char *tumblep_pf1_data,*tumblep_pf2_data;
static struct tilemap *pf1_tilemap,*pf1_alt_tilemap,*pf2_tilemap;
static unsigned char *gfx_base;
static int gfx_bank,flipscreen;
/******************************************************************************/
static void tumblep_mark_sprite_colours(void)
{
int offs,color,i,pal_base,colmask[16];
unsigned int *pen_usage;
palette_init_used_colors();
pen_usage=Machine->gfx[3]->pen_usage;
pal_base = Machine->drv->gfxdecodeinfo[3].color_codes_start;
for (color = 0;color < 16;color++) colmask[color] = 0;
for (offs = 0;offs < 0x800;offs += 8)
{
int x,y,sprite,multi;
sprite = READ_WORD (&spriteram[offs+2]) & 0x3fff;
if (!sprite) continue;
y = READ_WORD(&spriteram[offs]);
x = READ_WORD(&spriteram[offs+4]);
color = (x >>9) &0xf;
multi = (1 << ((y & 0x0600) >> 9)) - 1; /* 1x, 2x, 4x, 8x height */
sprite &= ~multi;
while (multi >= 0)
{
colmask[color] |= pen_usage[sprite + multi];
multi--;
}
}
for (color = 0;color < 16;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 tumblep_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 (&spriteram[offs+2]) & 0x3fff;
if (!sprite) continue;
y = READ_WORD(&spriteram[offs]);
flash=y&0x1000;
if (flash && (cpu_getcurrentframe() & 1)) continue;
x = READ_WORD(&spriteram[offs+4]);
colour = (x >>9) & 0xf;
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 >= 320) x -= 512;
if (y >= 256) y -= 512;
y = 240 - y;
x = 304 - x;
sprite &= ~multi;
if (fy)
inc = -1;
else
{
sprite += multi;
inc = 1;
}
if (flipscreen)
{
y=240-y;
x=304-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( tumblep_pf1_data_w )
{
COMBINE_WORD_MEM(&tumblep_pf1_data[offset],data);
tilemap_mark_tile_dirty(pf1_tilemap,offset/2);
tilemap_mark_tile_dirty(pf1_alt_tilemap,offset/2);
}
WRITE_HANDLER( tumblep_pf2_data_w )
{
COMBINE_WORD_MEM(&tumblep_pf2_data[offset],data);
tilemap_mark_tile_dirty(pf2_tilemap,offset/2);
}
WRITE_HANDLER( tumblep_control_0_w )
{
COMBINE_WORD_MEM(&tumblep_control_0[offset],data);
}
/******************************************************************************/
static UINT32 tumblep_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);
}
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(&tumblep_pf1_data[2*tile_index]);
int color=tile >> 12;
tile=tile&0xfff;
SET_TILE_INFO(0,tile,color)
}
int tumblep_vh_start(void)
{
pf1_tilemap = tilemap_create(get_fg_tile_info,tilemap_scan_rows,TILEMAP_TRANSPARENT, 8, 8,64,32);
pf1_alt_tilemap = tilemap_create(get_bg_tile_info,tumblep_scan,TILEMAP_TRANSPARENT,16,16,64,32);
pf2_tilemap = tilemap_create(get_bg_tile_info,tumblep_scan,TILEMAP_OPAQUE, 16,16,64,32);
if (!pf1_tilemap || !pf1_alt_tilemap || !pf2_tilemap)
return 1;
pf1_tilemap->transparent_pen = 0;
pf1_alt_tilemap->transparent_pen = 0;
return 0;
}
/******************************************************************************/
void tumblep_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
flipscreen=(READ_WORD(&tumblep_control_0[0])&0x80);
tilemap_set_flip(ALL_TILEMAPS,flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0);
if (flipscreen) offs=1; else offs=-1;
tilemap_set_scrollx( pf1_tilemap,0, READ_WORD(&tumblep_control_0[2])+offs );
tilemap_set_scrolly( pf1_tilemap,0, READ_WORD(&tumblep_control_0[4]) );
tilemap_set_scrollx( pf1_alt_tilemap,0, READ_WORD(&tumblep_control_0[2])+offs );
tilemap_set_scrolly( pf1_alt_tilemap,0, READ_WORD(&tumblep_control_0[4]) );
tilemap_set_scrollx( pf2_tilemap,0, READ_WORD(&tumblep_control_0[6])+offs );
tilemap_set_scrolly( pf2_tilemap,0, READ_WORD(&tumblep_control_0[8]) );
gfx_bank=1;
gfx_base=tumblep_pf2_data;
tilemap_update(pf2_tilemap);
gfx_bank=2;
gfx_base=tumblep_pf1_data;
tilemap_update(pf1_alt_tilemap);
tilemap_update(pf1_tilemap);
tumblep_mark_sprite_colours();
tilemap_render(ALL_TILEMAPS);
tilemap_draw(bitmap,pf2_tilemap,0);
if (READ_WORD(&tumblep_control_0[0xc])&0x80)
tilemap_draw(bitmap,pf1_tilemap,0);
else
tilemap_draw(bitmap,pf1_alt_tilemap,0);
tumblep_drawsprites(bitmap);
}
void tumblepb_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs,offs2;
flipscreen=(READ_WORD(&tumblep_control_0[0])&0x80);
tilemap_set_flip(ALL_TILEMAPS,flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0);
if (flipscreen) offs=1; else offs=-1;
if (flipscreen) offs2=-3; else offs2=-5;
tilemap_set_scrollx( pf1_tilemap,0, READ_WORD(&tumblep_control_0[2])+offs2 );
tilemap_set_scrolly( pf1_tilemap,0, READ_WORD(&tumblep_control_0[4]) );
tilemap_set_scrollx( pf1_alt_tilemap,0, READ_WORD(&tumblep_control_0[2])+offs2 );
tilemap_set_scrolly( pf1_alt_tilemap,0, READ_WORD(&tumblep_control_0[4]) );
tilemap_set_scrollx( pf2_tilemap,0, READ_WORD(&tumblep_control_0[6])+offs );
tilemap_set_scrolly( pf2_tilemap,0, READ_WORD(&tumblep_control_0[8]) );
gfx_bank=1;
gfx_base=tumblep_pf2_data;
tilemap_update(pf2_tilemap);
gfx_bank=2;
gfx_base=tumblep_pf1_data;
tilemap_update(pf1_tilemap);
tilemap_update(pf1_alt_tilemap);
tumblep_mark_sprite_colours();
tilemap_render(ALL_TILEMAPS);
tilemap_draw(bitmap,pf2_tilemap,0);
if (READ_WORD(&tumblep_control_0[0xc])&0x80)
tilemap_draw(bitmap,pf1_tilemap,0);
else
tilemap_draw(bitmap,pf1_alt_tilemap,0);
tumblep_drawsprites(bitmap);
}