summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/carjmbre.c
blob: 595d38e0d7bc8b21deedf45a6e2d37ace0795123 (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
164
/***************************************************************************

    Car Jamboree
    Omori Electric CAD (OEC) 1983

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

#include "emu.h"
#include "video/resnet.h"
#include "includes/carjmbre.h"

// palette info from Popper (OEC 1983, very similar video hw)
static const res_net_decode_info carjmbre_decode_info =
{
	1,		// there may be two proms needed to construct color
	0, 63,	// start/end
	//  R,   G,   B,
	{   0,   0,   0, },		// offsets
	{   0,   3,   6, },		// shifts
	{0x07,0x07,0x03, }	    // masks
};

static const res_net_info carjmbre_net_info =
{
	RES_NET_VCC_5V | RES_NET_VBIAS_5V | RES_NET_VIN_TTL_OUT,
	{
		{ RES_NET_AMP_NONE, 0, 0, 3, { 1000, 470, 220 } },
		{ RES_NET_AMP_NONE, 0, 0, 3, { 1000, 470, 220 } },
		{ RES_NET_AMP_NONE, 0, 0, 2, {  470, 220,   0 } }
	}
};

PALETTE_INIT( carjmbre )
{
	rgb_t *rgb;

	rgb = compute_res_net_all(machine, color_prom, &carjmbre_decode_info, &carjmbre_net_info);
	palette_set_colors(machine, 0, rgb, 64);
	palette_normalize_range(machine.palette, 0, 63, 0, 255);
	auto_free(machine, rgb);
}



WRITE8_HANDLER( carjmbre_flipscreen_w )
{
	carjmbre_state *state = space->machine().driver_data<carjmbre_state>();

	state->m_flipscreen = (data & 1) ? (TILEMAP_FLIPX | TILEMAP_FLIPY) : 0;
	tilemap_set_flip_all(space->machine(), state->m_flipscreen);
}

WRITE8_HANDLER( carjmbre_bgcolor_w )
{
	carjmbre_state *state = space->machine().driver_data<carjmbre_state>();
	data = ~data & 0x3f;

	if (data != state->m_bgcolor)
	{
		int i;

		state->m_bgcolor = data;
		if (data & 3)
			for (i = 0; i < 64; i += 4)
				palette_set_color(space->machine(), i, palette_get_color(space->machine(), data));
		else
			// restore to initial state (black)
			for (i = 0; i < 64; i += 4)
				palette_set_color(space->machine(), i, RGB_BLACK);
	}
}

WRITE8_HANDLER( carjmbre_8806_w )
{
	// unknown, gets updated at same time as carjmbre_bgcolor_w
}

WRITE8_HANDLER( carjmbre_videoram_w )
{
	carjmbre_state *state = space->machine().driver_data<carjmbre_state>();

	state->m_videoram[offset] = data;
	tilemap_mark_tile_dirty(state->m_cj_tilemap, offset & 0x3ff);
}



static TILE_GET_INFO( get_carjmbre_tile_info )
{
	carjmbre_state *state = machine.driver_data<carjmbre_state>();
	UINT32 tile_number = state->m_videoram[tile_index] & 0xff;
	UINT8 attr = state->m_videoram[tile_index + 0x400];
	tile_number += (attr & 0x80) << 1; /* bank */

	SET_TILE_INFO(
			0,
			tile_number,
			attr & 0xf,
			0);
}

VIDEO_START( carjmbre )
{
	carjmbre_state *state = machine.driver_data<carjmbre_state>();

	state->m_cj_tilemap = tilemap_create(machine, get_carjmbre_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
	state->save_item(NAME(state->m_flipscreen));
	state->save_item(NAME(state->m_bgcolor));
}

SCREEN_UPDATE( carjmbre )
{
	carjmbre_state *state = screen->machine().driver_data<carjmbre_state>();
	int offs, troffs, sx, sy, flipx, flipy;

	//colorram
	//76543210
	//x------- graphic bank
	//-xxx---- unused
	//----xxxx colour

	tilemap_draw(bitmap, cliprect, state->m_cj_tilemap, 0, 0);

	//spriteram[offs]
	//+0       y pos
	//+1       sprite number
	//+2
	//76543210
	//x------- flipy
	//-x------ flipx
	//--xx---- unused
	//----xxxx colour
	//+3       x pos
	for (offs = state->m_spriteram_size - 4; offs >= 0; offs -= 4)
	{
		//before copying the sprites to spriteram the game reorders the first
		//sprite to last, sprite ordering is incorrect if this isn't undone
		troffs = (offs - 4 + state->m_spriteram_size) % state->m_spriteram_size;

		//unused sprites are marked with ypos <= 0x02 (or >= 0xfd if screen flipped)
		if (state->m_spriteram[troffs] > 0x02 && state->m_spriteram[troffs] < 0xfd)
		{
			sx = state->m_spriteram[troffs + 3] - 7;
			sy = 241 - state->m_spriteram[troffs];
			flipx = (state->m_spriteram[troffs + 2] & 0x40) >> 6;
			flipy = (state->m_spriteram[troffs + 2] & 0x80) >> 7;

			if (state->m_flipscreen)
			{
				sx = (256 + (226 - sx)) % 256;
				sy = 242 - sy;
				flipx = !flipx;
				flipy = !flipy;
			}

			drawgfx_transpen(bitmap, cliprect, screen->machine().gfx[1],
					state->m_spriteram[troffs + 1],
					state->m_spriteram[troffs + 2] & 0xf,
					flipx,flipy,
					sx,sy,0);
		}
	}
	return 0;
}