1 /***************************************************************************
2
3 vidhrdw.c
4
5 Functions to emulate the video hardware of the machine.
6
7 ***************************************************************************/
8
9 #include "driver.h"
10 #include "vidhrdw/generic.h"
11
12 unsigned char *cop01_videoram;
13 size_t cop01_videoram_size;
14
15 static unsigned char cop01_scrollx[1];
16 static unsigned char spritebank = 0;
17 static int flipscreen;
18
19 static struct osd_bitmap *tmpbitmap2;
20
21
22
cop01_vh_convert_color_prom(unsigned char * palette,unsigned short * colortable,const unsigned char * color_prom)23 void cop01_vh_convert_color_prom(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom)
24 {
25 int i;
26 #define TOTAL_COLORS(gfxn) (Machine->gfx[gfxn]->total_colors * Machine->gfx[gfxn]->color_granularity)
27 #define COLOR(gfxn,offs) (colortable[Machine->drv->gfxdecodeinfo[gfxn].color_codes_start + offs])
28
29 for (i = 0;i < Machine->drv->total_colors;i++)
30 {
31 int bit0,bit1,bit2,bit3;
32
33 bit0 = (color_prom[0] >> 0) & 0x01;
34 bit1 = (color_prom[0] >> 1) & 0x01;
35 bit2 = (color_prom[0] >> 2) & 0x01;
36 bit3 = (color_prom[0] >> 3) & 0x01;
37 *(palette++) = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
38 bit0 = (color_prom[Machine->drv->total_colors] >> 0) & 0x01;
39 bit1 = (color_prom[Machine->drv->total_colors] >> 1) & 0x01;
40 bit2 = (color_prom[Machine->drv->total_colors] >> 2) & 0x01;
41 bit3 = (color_prom[Machine->drv->total_colors] >> 3) & 0x01;
42 *(palette++) = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
43 bit0 = (color_prom[2*Machine->drv->total_colors] >> 0) & 0x01;
44 bit1 = (color_prom[2*Machine->drv->total_colors] >> 1) & 0x01;
45 bit2 = (color_prom[2*Machine->drv->total_colors] >> 2) & 0x01;
46 bit3 = (color_prom[2*Machine->drv->total_colors] >> 3) & 0x01;
47 *(palette++) = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
48
49 color_prom++;
50 }
51
52 color_prom += 2*Machine->drv->total_colors;
53 /* color_prom now points to the beginning of the lookup tables */
54
55 /* characters use colors 0-15 */
56 for (i = 0;i < TOTAL_COLORS(0);i++)
57 COLOR(0,i) = (*(color_prom++) & 0x0f); /* ?? */
58
59 /* background tiles use colors 192-255 */
60 for (i = 0;i < TOTAL_COLORS(1);i++)
61 COLOR(1,i) = i + 192;
62
63 /* sprites use colors 128-143 */
64 for (i = 0;i < TOTAL_COLORS(2);i++)
65 COLOR(2,i) = (*(color_prom++) & 0x0f) + 128;
66 }
67
68
69
70 /***************************************************************************
71
72 Start the video hardware emulation.
73
74 ***************************************************************************/
cop01_vh_start(void)75 int cop01_vh_start(void)
76 {
77 if (generic_vh_start() != 0)
78 return 1;
79
80 if ((tmpbitmap2 = bitmap_alloc(2*Machine->drv->screen_width,Machine->drv->screen_height)) == 0)
81 {
82 generic_vh_stop();
83 return 1;
84 }
85
86 return 0;
87 }
88
89
90
91 /***************************************************************************
92
93 Stop the video hardware emulation.
94
95 ***************************************************************************/
96
cop01_vh_stop(void)97 void cop01_vh_stop(void)
98 {
99 bitmap_free(tmpbitmap2);
100 generic_vh_stop();
101 }
102
103
104
WRITE_HANDLER(cop01_scrollx_w)105 WRITE_HANDLER( cop01_scrollx_w )
106 {
107 cop01_scrollx[offset] = data;
108 }
109
110
WRITE_HANDLER(cop01_gfxbank_w)111 WRITE_HANDLER( cop01_gfxbank_w )
112 {
113 /* bits 0 and 1 coin counters */
114 coin_counter_w(0,data & 1);
115 coin_counter_w(1,data & 2);
116
117 /* bit 2 flip screen */
118 if (flipscreen != (data & 0x04))
119 {
120 flipscreen = data & 0x04;
121 memset(dirtybuffer,1,videoram_size);
122 }
123
124 /* bits 4 and 5 select sprite bank */
125 spritebank = (data & 0x30) >> 4;
126
127 //logerror("gfxbank = %02x\n",data);
128 }
129
130
131
132
133 /***************************************************************************
134
135 Draw the game screen in the given osd_bitmap.
136 Do NOT call osd_update_display() from this function, it will be called by
137 the main emulation engine.
138
139 ***************************************************************************/
cop01_vh_screenrefresh(struct osd_bitmap * bitmap,int full_refresh)140 void cop01_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
141 {
142 int offs;
143
144
145 /* draw the background */
146 for (offs = videoram_size - 1;offs >= 0;offs--)
147 {
148 if (dirtybuffer[offs])
149 {
150 int sx,sy;
151
152 dirtybuffer[offs] = 0;
153
154 sx = offs % 64;
155 sy = offs / 64;
156 if (flipscreen)
157 {
158 sx = 63 - sx;
159 sy = 31 - sy;
160 }
161
162 drawgfx(tmpbitmap2,Machine->gfx[1],
163 videoram[offs] + ((colorram[offs] & 0x03) << 8),
164 (colorram[offs] & 0x0c) >> 2,
165 flipscreen,flipscreen,
166 8*sx,8*sy,
167 0,TRANSPARENCY_NONE,0);
168 }
169 }
170
171 /* copy the background graphics */
172 {
173 int scrollx;
174
175
176 if (flipscreen)
177 scrollx = (cop01_scrollx[0] + 256 * cop01_scrollx[1]) - 256;
178 else
179 scrollx = -(cop01_scrollx[0] + 256 * cop01_scrollx[1]);
180
181 copyscrollbitmap(bitmap,tmpbitmap2,1,&scrollx,0,0,&Machine->visible_area,TRANSPARENCY_NONE,0);
182 }
183
184
185 /* draw the sprites */
186 for (offs = 0;offs < spriteram_size;offs += 4)
187 {
188 int attr = spriteram[offs+2];
189 int numtile = spriteram[offs+1];
190 int flipx = attr & 4;
191 int sx,sy;
192
193 if (numtile & 0x80) /* high tiles are bankswitched */
194 {
195 if (spritebank & 1) numtile += 128;
196 else if (spritebank & 2) numtile += 256;
197 }
198
199 sy = 240 - spriteram[offs];
200 sx = (spriteram[offs+3] - 0x80) + 256 * (attr & 1);
201 if (flipscreen)
202 {
203 sx = 240 - sx;
204 sy = 240 - sy;
205 flipx = !flipx;
206 }
207
208 drawgfx(bitmap,Machine->gfx[2],
209 numtile,
210 (attr & 0xf0) >> 4,
211 flipx,flipscreen,
212 sx,sy,
213 &Machine->visible_area,TRANSPARENCY_PEN,0);
214 }
215
216
217 /* draw the foreground characters */
218 for (offs = cop01_videoram_size - 1;offs >= 0;offs--)
219 {
220 int sx,sy;
221
222
223 sx = offs % 32;
224 sy = offs / 32;
225 if (flipscreen)
226 {
227 sx = 31 - sx;
228 sy = 31 - sy;
229 }
230
231 drawgfx(bitmap,Machine->gfx[0],
232 cop01_videoram[offs],
233 0, /* is there a color selector missing? */
234 flipscreen,flipscreen,
235 8*sx,8*sy,
236 &Machine->visible_area,TRANSPARENCY_PEN,15);
237 }
238 }
239