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Rev Author Line No. Line
18 nishi 1 
/* $Id: video.c 32 2024-09-01 08:51:40Z nishi $ */
2 
 
3 
#include "video.h"
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19 nishi 5 
#include "math.h"
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18 nishi 7 
#include "../char.h"
8 
#include "../io.h"
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10 
int scrwidth;
11 
int scrheight;
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13 
short vdp_addr;
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short vdp_data;
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short vdg_addr;
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short vdg_data;
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18 
void write_vram(unsigned short addr){
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	if(vdp_addr != -1){
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		addr |= 0x4000;
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		outp(vdp_addr, addr & 0x00ff);
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		outp(vdp_addr, ((addr & 0xff00) >> 8));
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	}
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#ifndef ONLY_VDP
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	else if(vdg_addr != -1){
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		outp(vdg_addr, addr & 0x00ff);
27 
		outp(vdg_addr, ((addr & 0xff00) >> 8));
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	}
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#endif
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}
31 
 
32 
void read_vram(unsigned short addr){
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	if(vdp_addr != -1){
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		outp(vdp_addr, addr & 0x00ff);
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		outp(vdp_addr, ((addr & 0xff00) >> 8));
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	}
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#ifndef ONLY_VDP
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	else if(vdg_addr != -1){
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		outp(vdg_addr, addr & 0x00ff);
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		outp(vdg_addr, ((addr & 0xff00) >> 8));
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	}
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#endif
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}
44 
 
45 
void setvramaddr(unsigned short addr){
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	if(vdp_addr != -1){
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		write_vram(0x800 + addr);
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	}
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#ifndef ONLY_VDP
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	else if(vdg_addr != -1){
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		write_vram(addr);
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	}
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#endif
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}
55 
 
32 nishi 56 
void change_color(unsigned char color){
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	if(vdp_addr != -1){
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		outp(vdp_addr, color);
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		outp(vdp_addr, 0x87);
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		int i;
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		write_vram(0x1400);
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		for(i = 0; i < 0x10; i++) outp(vdp_data, color);
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		write_vram(0x1400 + 0x10);
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		for(i = 0; i < 0x10; i++) outp(vdp_data, ((i & 0xf) << 4) | 1);
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	}
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#ifndef ONLY_VDP
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	else if(vdg_addr != -1){
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	}
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#endif
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}
71 
 
18 nishi 72 
void setreadvramaddr(unsigned short addr){
73 
	if(vdp_addr != -1){
74 
		read_vram(0x800 + addr);
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	}
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#ifndef ONLY_VDP
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	else if(vdg_addr != -1){
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		read_vram(addr);
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	}
80 
#endif
81 
}
82 
 
83 
void vramchar(unsigned char c){
84 
	if(vdp_addr != -1){
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		outp(vdp_data, c - 0x20);
86 
	}
87 
#ifndef ONLY_VDP
88 
	else if(vdg_addr != -1){
89 
		if(c == 248){
90 
			outp(vdg_data, 0);
91 
		}else{
92 
			outp(vdg_data, toupper(c) - 'A' + 1);
93 
		}
94 
	}
95 
#endif
96 
}
97 
 
98 
void _vramchar(unsigned char c){
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	if(vdp_addr != -1){
100 
		outp(vdp_data, c);
101 
	}
102 
#ifndef ONLY_VDP
103 
	else if(vdg_addr != -1){
104 
		outp(vdg_data, c);
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	}
106 
#endif
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}
108 
 
109 
unsigned char getvramchar(void){
110 
	if(vdp_addr != -1){
19 nishi 111 
		return inp(vdp_data) + 0x20;
18 nishi 112 
	}
113 
#ifndef ONLY_VDP
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	else if(vdg_addr != -1){
19 nishi 115 
		return inp(vdg_data) - 1 + 'A';
18 nishi 116 
	}
117 
#endif
118 
	return 0;
119 
}
120 
 
27 nishi 121 
void thin_char(void){
122 
	if(vdp_addr != -1){
123 
		scrwidth = 40;
124 
		scrheight = 24;
125 
 
126 
		outp(vdp_addr, 0xd0);
127 
		outp(vdp_addr, 0x81);
128 
 
129 
		outp(vdp_addr, 0xf4);
130 
		outp(vdp_addr, 0x87);
131 
	}
132 
}
133 
 
19 nishi 134 
void scroll_y(void){
135 
	int i;
136 
	int size = muli(scrwidth, scrheight - 1);
137 
	for(i = 0; i < size; i++){
138 
		setreadvramaddr(i + scrwidth);
139 
		unsigned char ch = getvramchar();
140 
		setvramaddr(i);
141 
		vramchar(ch);
142 
	}
143 
	for(i = 0; i < scrwidth; i++){
144 
		vramchar(' ');
145 
	}
146 
}
147 
 
18 nishi 148 
void video_init(void){
149 
	int i;
150 
	if(vdp_addr != -1){
151 
		scrwidth = 32;
152 
		scrheight = 24;
153 
 
154 
		outp(vdp_addr, 0x00);
155 
		outp(vdp_addr, 0x80);
156 
 
157 
		outp(vdp_addr, 0xd8);
158 
		outp(vdp_addr, 0x81);
159 
 
160 
		outp(vdp_addr, 0x02);
161 
		outp(vdp_addr, 0x82);
162 
 
163 
		outp(vdp_addr, 0x50);
164 
		outp(vdp_addr, 0x83);
165 
 
166 
		outp(vdp_addr, 0x00);
167 
		outp(vdp_addr, 0x84);
168 
 
169 
		outp(vdp_addr, 0x29);
170 
		outp(vdp_addr, 0x85);
171 
 
172 
		outp(vdp_addr, 0x03);
173 
		outp(vdp_addr, 0x86);
174 
 
175 
		/*
176 
		 * VDP:
177 
		 * 0x0000-0x0800: font
178 
		 * 0x0800-0x1400: pattern
179 
		 * 0x1400-0x1480: color
180 
		 * 0x1480-0x1500: sprite attr
181 
		 * 0x1800-0x2000: sprite pattern
182 
		 */
183 
 
184 
		write_vram(0);
185 
		for(i = 0; i < 0x800; i++) outp(vdp_data, *((unsigned char*)(0x6000 - 2048 + i)));
32 nishi 186 
 
187 
		change_color(0xf4);
18 nishi 188 
	}
189 
#ifndef ONLY_VDP
190 
	else if(vdg_addr != -1){
191 
		scrwidth = 32;
192 
		scrheight = 16;
193 
	}
194 
#endif
195 
}
196 
 
197 
void video_card(int t, int port){
198 
	if(t == 0x01){
199 
		vdp_addr = port - 2;
200 
		vdp_data = port - 1;
201 
	}else if(t == 0x02){
202 
		vdg_addr = port - 2;
203 
		vdg_data = port - 1;
204 
	}
205 
}