summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/mario.c
blob: 2470e3970e2fd8b403bbb72aa94683b321f1a863 (plain) (blame)
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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/***************************************************************************

  video.c

  Functions to emulate the video hardware of the machine.

***************************************************************************/

#include "driver.h"
#include "video/resnet.h"

#include "includes/mario.h"

static UINT8 gfx_bank, palette_bank;
static int monitor;

static tilemap *bg_tilemap;

static const res_net_decode_info mario_decode_info =
{
	1,		// there may be two proms needed to construct color
	0,		// start at 0
	255,	// end at 255
	//  R,   G,   B
	{   0,   0,   0},		// offsets
	{   5,   2,   0},		// shifts
	{0x07,0x07,0x03}	    // masks
};

static const res_net_info mario_net_info =
{
	RES_NET_VCC_5V | RES_NET_VBIAS_5V | RES_NET_VIN_MB7052 | RES_NET_MONITOR_SANYO_EZV20,
	{
		{ RES_NET_AMP_DARLINGTON, 470, 0, 3, { 1000, 470, 220 } },
		{ RES_NET_AMP_DARLINGTON, 470, 0, 3, { 1000, 470, 220 } },
		{ RES_NET_AMP_EMITTER,    680, 0, 2, {  470, 220,   0 } }  // dkong
	}
};

static const res_net_info mario_net_info_std =
{
	RES_NET_VCC_5V | RES_NET_VBIAS_5V | RES_NET_VIN_MB7052,
	{
		{ RES_NET_AMP_DARLINGTON, 470, 0, 3, { 1000, 470, 220 } },
		{ RES_NET_AMP_DARLINGTON, 470, 0, 3, { 1000, 470, 220 } },
		{ RES_NET_AMP_EMITTER,    680, 0, 2, {  470, 220,   0 } }  // dkong
	}
};

/***************************************************************************

  Convert the color PROMs into a more useable format.

  Mario Bros. has a 512x8 palette PROM; interstingly, bytes 0-255 contain an
  inverted palette, as other Nintendo games like Donkey Kong, while bytes
  256-511 contain a non inverted palette. This was probably done to allow
  connection to both the special Nintendo and a standard monitor.
  The palette PROM is connected to the RGB output this way:

  bit 7 -- 220 ohm resistor -- inverter  -- RED
        -- 470 ohm resistor -- inverter  -- RED
        -- 1  kohm resistor -- inverter  -- RED
        -- 220 ohm resistor -- inverter  -- GREEN
        -- 470 ohm resistor -- inverter  -- GREEN
        -- 1  kohm resistor -- inverter  -- GREEN
        -- 220 ohm resistor -- inverter  -- BLUE
  bit 0 -- 470 ohm resistor -- inverter  -- BLUE

***************************************************************************/
PALETTE_INIT( mario )
{
	rgb_t	*rgb;

	rgb = compute_res_net_all(color_prom, &mario_decode_info, &mario_net_info);
	palette_set_colors(machine, 0, rgb, 256);
	free(rgb);
	rgb = compute_res_net_all(color_prom+256, &mario_decode_info, &mario_net_info_std);
	palette_set_colors(machine, 256, rgb, 256);
	free(rgb);
	
	palette_normalize_range(machine->palette, 0, 255, 0, 255);
	palette_normalize_range(machine->palette, 256, 511, 0, 255);
}

WRITE8_HANDLER( mario_videoram_w )
{
	videoram[offset] = data;
	tilemap_mark_tile_dirty(bg_tilemap, offset);
}

WRITE8_HANDLER( mario_gfxbank_w )
{
	if (gfx_bank != (data & 0x01))
	{
		gfx_bank = data & 0x01;
		tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
	}
}

WRITE8_HANDLER( mario_palettebank_w )
{
	if (palette_bank != (data & 0x01))
	{
		palette_bank = data & 0x01;
		tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
	}
}

WRITE8_HANDLER( mario_scroll_w )
{
	tilemap_set_scrolly(bg_tilemap, 0, data + 17);
}

static TILE_GET_INFO( get_bg_tile_info )
{
	int code = videoram[tile_index] + 256 * gfx_bank;
	int color;

	color =  ((videoram[tile_index] >> 2) & 0x38) | 0x40 | (palette_bank<<7) | (monitor<<8);
	color = color >> 2;
	SET_TILE_INFO(0, code, color, 0);
}

VIDEO_START( mario )
{
	bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows,
		TILEMAP_TYPE_PEN, 8, 8, 32, 32);

	state_save_register_global(gfx_bank);
	state_save_register_global(palette_bank);
}

static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect)
{
	int offs;

	for (offs = 0;offs < spriteram_size;offs += 4)
	{
		if (spriteram[offs])
		{
			drawgfx(bitmap,machine->gfx[1],
					spriteram[offs + 2],
					(spriteram[offs + 1] & 0x0f) + 16 * palette_bank+32 * monitor,
					spriteram[offs + 1] & 0x80,spriteram[offs + 1] & 0x40,
					spriteram[offs + 3] - 8,(VBSTART - 1) - spriteram[offs] + 8,
					cliprect,TRANSPARENCY_PEN,0);
		}
	}
}

VIDEO_UPDATE( mario )
{
	int t;
	t = readinputportbytag("MONITOR");
	if (t != monitor)
	{
		monitor = t;
		tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
	}
	tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
	draw_sprites(machine, bitmap, cliprect);
	return 0;
}