1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/***************************************************************************
Atari Canyon Bomber video emulation
***************************************************************************/
#include "driver.h"
#include "includes/canyon.h"
static tilemap *bg_tilemap;
UINT8* canyon_videoram;
WRITE8_HANDLER( canyon_videoram_w )
{
canyon_videoram[offset] = data;
tilemap_mark_tile_dirty(bg_tilemap, offset);
}
static TILE_GET_INFO( get_bg_tile_info )
{
UINT8 code = canyon_videoram[tile_index];
SET_TILE_INFO(0, code & 0x3f, code >> 7, 0);
}
VIDEO_START( canyon )
{
bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows,
TILEMAP_TYPE_PEN, 8, 8, 32, 32);
}
static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle* cliprect)
{
int i;
for (i = 0; i < 2; i++)
{
int x = canyon_videoram[0x3d0 + 2 * i + 0x1];
int y = canyon_videoram[0x3d0 + 2 * i + 0x8];
int c = canyon_videoram[0x3d0 + 2 * i + 0x9];
drawgfx(bitmap, machine->gfx[1],
c >> 3,
i,
!(c & 0x80), 0,
224 - x,
240 - y,
cliprect,
TRANSPARENCY_PEN, 0);
}
}
static void draw_bombs(mame_bitmap *bitmap, const rectangle* cliprect)
{
int i;
for (i = 0; i < 2; i++)
{
int sx = 254 - canyon_videoram[0x3d0 + 2 * i + 0x5];
int sy = 246 - canyon_videoram[0x3d0 + 2 * i + 0xc];
rectangle rect;
rect.min_x = sx;
rect.min_y = sy;
rect.max_x = sx + 1;
rect.max_y = sy + 1;
if (rect.min_x < cliprect->min_x) rect.min_x = cliprect->min_x;
if (rect.min_y < cliprect->min_y) rect.min_y = cliprect->min_y;
if (rect.max_x > cliprect->max_x) rect.max_x = cliprect->max_x;
if (rect.max_y > cliprect->max_y) rect.max_y = cliprect->max_y;
fillbitmap(bitmap, i, &rect);
}
}
VIDEO_UPDATE( canyon )
{
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
draw_sprites(machine, bitmap, cliprect);
draw_bombs(bitmap, cliprect);
/* watchdog is disabled during service mode */
watchdog_enable(!(readinputport(2) & 0x10));
return 0;
}
|