summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/simpsons.c
blob: 13bf7ecbea8de68792d35987687fb2b353654983 (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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
#include "driver.h"
#include "video/konamiic.h"

static int bg_colorbase,sprite_colorbase,layer_colorbase[3];
UINT8 *simpsons_xtraram;
static int layerpri[3];


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

  Callbacks for the K052109

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

static void tile_callback(int layer,int bank,int *code,int *color,int *flags,int *priority)
{
	*code |= ((*color & 0x3f) << 8) | (bank << 14);
	*color = layer_colorbase[layer] + ((*color & 0xc0) >> 6);
}


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

  Callbacks for the K053247

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

static void sprite_callback(int *code,int *color,int *priority_mask)
{
	int pri = (*color & 0x0f80) >> 6;	/* ??????? */
	if (pri <= layerpri[2])								*priority_mask = 0;
	else if (pri > layerpri[2] && pri <= layerpri[1])	*priority_mask = 0xf0;
	else if (pri > layerpri[1] && pri <= layerpri[0])	*priority_mask = 0xf0|0xcc;
	else 												*priority_mask = 0xf0|0xcc|0xaa;

	*color = sprite_colorbase + (*color & 0x001f);
}


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

    Start the video hardware emulation.

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

VIDEO_START( simpsons )
{
	K053251_vh_start();

	K052109_vh_start(machine,REGION_GFX1,NORMAL_PLANE_ORDER,tile_callback);
	K053247_vh_start(machine,REGION_GFX2,53,23,NORMAL_PLANE_ORDER,sprite_callback);
}

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

  Extra video banking

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

static READ8_HANDLER( simpsons_K052109_r )
{
	return K052109_r(offset + 0x2000);
}

static WRITE8_HANDLER( simpsons_K052109_w )
{
	K052109_w(offset + 0x2000,data);
}

static READ8_HANDLER( simpsons_K053247_r )
{
	int offs;

	if (offset < 0x1000)
	{
		offs = offset >> 1;

		if (offset & 1)
			return(spriteram16[offs] & 0xff);
		else
			return(spriteram16[offs] >> 8);
	}
	else return simpsons_xtraram[offset - 0x1000];
}

static WRITE8_HANDLER( simpsons_K053247_w )
{
	int offs;

	if (offset < 0x1000)
	{
		offs = offset >> 1;

		if (offset & 1)
			spriteram16[offs] = (spriteram16[offs] & 0xff00) | data;
		else
			spriteram16[offs] = (spriteram16[offs] & 0x00ff) | (data<<8);
	}
	else simpsons_xtraram[offset - 0x1000] = data;
}

void simpsons_video_banking(int bank)
{
	if (bank & 1)
	{
		memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0x0000, 0x0fff, 0, 0, paletteram_r);
		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x0000, 0x0fff, 0, 0, paletteram_xBBBBBGGGGGRRRRR_be_w);
	}
	else
	{
		memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0x0000, 0x0fff, 0, 0, K052109_r);
		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x0000, 0x0fff, 0, 0, K052109_w);
	}

	if (bank & 2)
	{
		memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0x2000, 0x3fff, 0, 0, simpsons_K053247_r);
		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x2000, 0x3fff, 0, 0, simpsons_K053247_w);
	}
	else
	{
		memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0x2000, 0x3fff, 0, 0, simpsons_K052109_r);
		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x2000, 0x3fff, 0, 0, simpsons_K052109_w);
	}
}



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

  Display refresh

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

/* useful function to sort the three tile layers by priority order */
static void sortlayers(int *layer,int *pri)
{
#define SWAP(a,b) \
	if (pri[a] < pri[b]) \
	{ \
		int t; \
		t = pri[a]; pri[a] = pri[b]; pri[b] = t; \
		t = layer[a]; layer[a] = layer[b]; layer[b] = t; \
	}

	SWAP(0,1)
	SWAP(0,2)
	SWAP(1,2)
}

VIDEO_UPDATE( simpsons )
{
	int layer[3];


	bg_colorbase       = K053251_get_palette_index(K053251_CI0);
	sprite_colorbase   = K053251_get_palette_index(K053251_CI1);
	layer_colorbase[0] = K053251_get_palette_index(K053251_CI2);
	layer_colorbase[1] = K053251_get_palette_index(K053251_CI3);
	layer_colorbase[2] = K053251_get_palette_index(K053251_CI4);

	K052109_tilemap_update();

	layer[0] = 0;
	layerpri[0] = K053251_get_priority(K053251_CI2);
	layer[1] = 1;
	layerpri[1] = K053251_get_priority(K053251_CI3);
	layer[2] = 2;
	layerpri[2] = K053251_get_priority(K053251_CI4);

	sortlayers(layer,layerpri);

	fillbitmap(priority_bitmap,0,cliprect);
	fillbitmap(bitmap,machine->pens[16 * bg_colorbase],cliprect);
	tilemap_draw(bitmap,cliprect,K052109_tilemap[layer[0]],0,1);
	tilemap_draw(bitmap,cliprect,K052109_tilemap[layer[1]],0,2);
	tilemap_draw(bitmap,cliprect,K052109_tilemap[layer[2]],0,4);

	K053247_sprites_draw(machine, bitmap,cliprect);
	return 0;
}