Subversion Repositories Shiroi

Rev

Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
8 nishi 1 
/* $Id: video.c 8 2024-08-28 16:29:15Z nishi $ */
2 
 
3 
#include "video.h"
4 
 
5 
#include "io.h"
6 
#include "char.h"
7 
 
8 
int scrwidth;
9 
int scrheight;
10 
 
11 
short vdp_addr;
12 
short vdp_data;
13 
short vdg_addr;
14 
short vdg_data;
15 
 
16 
void write_vram(unsigned short addr){
17 
	if(vdp_addr != -1){
18 
		addr |= 0x4000;
19 
		outp(vdp_addr, addr & 0x00ff);
20 
		outp(vdp_addr, ((addr & 0xff00) >> 8));
21 
	}
22 
#ifndef ONLY_VDP
23 
	else if(vdg_addr != -1){
24 
		outp(vdg_addr, addr & 0x00ff);
25 
		outp(vdg_addr, ((addr & 0xff00) >> 8));
26 
	}
27 
#endif
28 
}
29 
 
30 
void read_vram(unsigned short addr){
31 
	if(vdp_addr != -1){
32 
		outp(vdp_addr, addr & 0x00ff);
33 
		outp(vdp_addr, ((addr & 0xff00) >> 8));
34 
	}
35 
#ifndef ONLY_VDP
36 
	else if(vdg_addr != -1){
37 
		outp(vdg_addr, addr & 0x00ff);
38 
		outp(vdg_addr, ((addr & 0xff00) >> 8));
39 
	}
40 
#endif
41 
}
42 
 
43 
void setvramaddr(unsigned short addr){
44 
	if(vdp_addr != -1){
45 
		write_vram(0x800 + addr);
46 
	}
47 
#ifndef ONLY_VDP
48 
	else if(vdg_addr != -1){
49 
		write_vram(addr);
50 
	}
51 
#endif
52 
}
53 
 
54 
void setreadvramaddr(unsigned short addr){
55 
	if(vdp_addr != -1){
56 
		read_vram(0x800 + addr);
57 
	}
58 
#ifndef ONLY_VDP
59 
	else if(vdg_addr != -1){
60 
		read_vram(addr);
61 
	}
62 
#endif
63 
}
64 
 
65 
void vramchar(unsigned char c){
66 
	if(vdp_addr != -1){
67 
		outp(vdp_data, c - 0x20);
68 
	}
69 
#ifndef ONLY_VDP
70 
	else if(vdg_addr != -1){
71 
		if(c == 248){
72 
			outp(vdg_data, 0);
73 
		}else{
74 
			outp(vdg_data, toupper(c) - 'A' + 1);
75 
		}
76 
	}
77 
#endif
78 
}
79 
 
80 
void _vramchar(unsigned char c){
81 
	if(vdp_addr != -1){
82 
		outp(vdp_data, c);
83 
	}
84 
#ifndef ONLY_VDP
85 
	else if(vdg_addr != -1){
86 
		outp(vdg_data, c);
87 
	}
88 
#endif
89 
}
90 
 
91 
unsigned char getvramchar(void){
92 
	if(vdp_addr != -1){
93 
		return inp(vdp_data);
94 
	}
95 
#ifndef ONLY_VDP
96 
	else if(vdg_addr != -1){
97 
		return inp(vdg_data);
98 
	}
99 
#endif
100 
	return 0;
101 
}
102 
 
103 
void video_init(void){
104 
	int i;
105 
	if(vdp_addr != -1){
106 
		scrwidth = 32;
107 
		scrheight = 24;
108 
 
109 
		outp(vdp_addr, 0x00);
110 
		outp(vdp_addr, 0x80);
111 
 
112 
		outp(vdp_addr, 0xd8);
113 
		outp(vdp_addr, 0x81);
114 
 
115 
		outp(vdp_addr, 0x02);
116 
		outp(vdp_addr, 0x82);
117 
 
118 
		outp(vdp_addr, 0x50);
119 
		outp(vdp_addr, 0x83);
120 
 
121 
		outp(vdp_addr, 0x00);
122 
		outp(vdp_addr, 0x84);
123 
 
124 
		outp(vdp_addr, 0x29);
125 
		outp(vdp_addr, 0x85);
126 
 
127 
		outp(vdp_addr, 0x03);
128 
		outp(vdp_addr, 0x86);
129 
 
130 
		outp(vdp_addr, 0xe4);
131 
		outp(vdp_addr, 0x87);
132 
 
133 
		/*
134 
		 * VDP:
135 
		 * 0x0000-0x0800: font
136 
		 * 0x0800-0x1400: pattern
137 
		 * 0x1400-0x1480: color
138 
		 * 0x1480-0x1500: sprite attr
139 
		 * 0x1800-0x2000: sprite pattern
140 
		 */
141 
 
142 
		write_vram(0);
143 
		for(i = 0; i < 0x800; i++) outp(vdp_data, *((unsigned char*)(0x6000 - 2048 + i)));
144 
 
145 
		write_vram(0x1400);
146 
		for(i = 0; i < 0x20; i++) outp(vdp_data, 0xf0);
147 
		write_vram(0x1400 + 0x10);
148 
		for(i = 0; i < 0x10; i++) outp(vdp_data, ((i & 0xf) << 4) | 0);
149 
	}
150 
#ifndef ONLY_VDP
151 
	else if(vdg_addr != -1){
152 
		scrwidth = 32;
153 
		scrheight = 16;
154 
	}
155 
#endif
156 
}
157 
 
158 
void video_card(int t, int port){
159 
	if(t == 0x01){
160 
		vdp_addr = port - 2;
161 
		vdp_data = port - 1;
162 
	}else if(t == 0x02){
163 
		vdg_addr = port - 2;
164 
		vdg_data = port - 1;
165 
	}
166 
}