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
98
99
100
101
|
/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/bigevglf.h"
WRITE8_HANDLER(bigevglf_palette_w)
{
bigevglf_state *state = space->machine().driver_data<bigevglf_state>();
int color;
state->m_paletteram[offset] = data;
color = state->m_paletteram[offset & 0x3ff] | (state->m_paletteram[0x400 + (offset & 0x3ff)] << 8);
palette_set_color_rgb(space->machine(), offset & 0x3ff, pal4bit(color >> 4), pal4bit(color >> 0), pal4bit(color >> 8));
}
WRITE8_HANDLER( bigevglf_gfxcontrol_w )
{
bigevglf_state *state = space->machine().driver_data<bigevglf_state>();
/* bits used: 0,1,2,3
0 and 2 select plane,
1 and 3 select visible plane,
*/
state->m_plane_selected = ((data & 4) >> 1) | (data & 1);
state->m_plane_visible = ((data & 8) >> 2) | ((data & 2) >> 1);
}
WRITE8_HANDLER( bigevglf_vidram_addr_w )
{
bigevglf_state *state = space->machine().driver_data<bigevglf_state>();
state->m_vidram_bank = (data & 0xff) * 0x100;
}
WRITE8_HANDLER( bigevglf_vidram_w )
{
bigevglf_state *state = space->machine().driver_data<bigevglf_state>();
UINT32 x, y, o;
o = state->m_vidram_bank + offset;
state->m_vidram[o + 0x10000 * state->m_plane_selected] = data;
y = o >>8;
x = (o & 255);
*BITMAP_ADDR16(state->m_tmp_bitmap[state->m_plane_selected], y, x) = data;
}
READ8_HANDLER( bigevglf_vidram_r )
{
bigevglf_state *state = space->machine().driver_data<bigevglf_state>();
return state->m_vidram[0x10000 * state->m_plane_selected + state->m_vidram_bank + offset];
}
VIDEO_START( bigevglf )
{
bigevglf_state *state = machine.driver_data<bigevglf_state>();
state->m_tmp_bitmap[0] = machine.primary_screen->alloc_compatible_bitmap();
state->m_tmp_bitmap[1] = machine.primary_screen->alloc_compatible_bitmap();
state->m_tmp_bitmap[2] = machine.primary_screen->alloc_compatible_bitmap();
state->m_tmp_bitmap[3] = machine.primary_screen->alloc_compatible_bitmap();
state->save_item(NAME(*state->m_tmp_bitmap[0]));
state->save_item(NAME(*state->m_tmp_bitmap[1]));
state->save_item(NAME(*state->m_tmp_bitmap[2]));
state->save_item(NAME(*state->m_tmp_bitmap[3]));
state->m_vidram = auto_alloc_array(machine, UINT8, 0x100 * 0x100 * 4);
state->save_pointer(NAME(state->m_vidram), 0x100 * 0x100 * 4);
}
static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
bigevglf_state *state = machine.driver_data<bigevglf_state>();
int i, j;
for (i = 0xc0-4; i >= 0; i-= 4)
{
int code, sx, sy;
code = state->m_spriteram2[i + 1];
sx = state->m_spriteram2[i + 3];
sy = 200 - state->m_spriteram2[i];
for (j = 0; j < 16; j++)
drawgfx_transpen(bitmap, cliprect, machine.gfx[0],
state->m_spriteram1[(code << 4) + j] + ((state->m_spriteram1[0x400 + (code << 4) + j] & 0xf) << 8),
state->m_spriteram2[i + 2] & 0xf,
0,0,
sx + ((j & 1) << 3), sy + ((j >> 1) << 3), 0);
}
}
SCREEN_UPDATE( bigevglf )
{
bigevglf_state *state = screen->machine().driver_data<bigevglf_state>();
copybitmap(bitmap, state->m_tmp_bitmap[state->m_plane_visible], 0, 0, 0, 0, cliprect);
draw_sprites(screen->machine(), bitmap, cliprect);
return 0;
}
|