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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#define Image IMAGE
#include <draw.h>
#include <memdraw.h>
#include <cursor.h>
#include "screen.h"
/*
* TVP3020 Viewpoint Video Interface Pallette.
* Assumes hooked up to an S3 86C928.
*/
enum {
Index = 0x06, /* Index register */
Data = 0x07, /* Data register */
};
/*
* Lower 2-bits of indirect DAC register
* addressing.
*/
static ushort dacxreg[4] = {
PaddrW, Pdata, Pixmask, PaddrR
};
static uchar
tvp3020io(uchar reg, uchar data)
{
uchar crt55;
crt55 = vgaxi(Crtx, 0x55) & 0xFC;
vgaxo(Crtx, 0x55, crt55|((reg>>2) & 0x03));
vgao(dacxreg[reg & 0x03], data);
return crt55;
}
static void
tvp3020xo(uchar index, uchar data)
{
uchar crt55;
crt55 = tvp3020io(Index, index);
vgao(dacxreg[Data & 0x03], data);
vgaxo(Crtx, 0x55, crt55);
}
static void
tvp3020disable(VGAscr*)
{
uchar r;
/*
* Disable
* cursor;
* cursor control enable for Bt485 DAC (!);
* the hardware cursor external operation mode.
*/
tvp3020xo(0x06, 0x10); /* Cursor Control Register */
r = vgaxi(Crtx, 0x45) & ~0x20;
vgaxo(Crtx, 0x45, r);
r = vgaxi(Crtx, 0x55) & ~0x20;
vgaxo(Crtx, 0x55, r);
}
static void
tvp3020enable(VGAscr*)
{
uchar r;
/*
* Make sure cursor is off by initialising the cursor
* control to defaults + X-Windows cursor mode.
*/
tvp3020xo(0x06, 0x10); /* Cursor Control Register */
/*
* Overscan colour,
* cursor colour 1 (white),
* cursor colour 2 (black).
*/
tvp3020xo(0x20, Pwhite); tvp3020xo(0x21, Pwhite); tvp3020xo(0x22, Pwhite);
tvp3020xo(0x23, Pwhite); tvp3020xo(0x24, Pwhite); tvp3020xo(0x25, Pwhite);
tvp3020xo(0x26, Pblack); tvp3020xo(0x27, Pblack); tvp3020xo(0x28, Pblack);
/*
* Finally, enable
* the hardware cursor external operation mode;
* cursor control enable for Bt485 DAC (!).
*/
r = vgaxi(Crtx, 0x55)|0x20;
vgaxo(Crtx, 0x55, r);
r = vgaxi(Crtx, 0x45)|0x20;
vgaxo(Crtx, 0x45, r);
}
static void
tvp3020load(VGAscr*, Cursor* curs)
{
uchar p, p0, p1;
int x, y;
/*
* Make sure cursor is off by initialising the cursor
* control to defaults + X-Windows cursor mode.
*/
tvp3020xo(0x06, 0x10); /* Cursor Control Register */
/*
* Initialise the cursor RAM LS and MS address
* (LS must be first).
*/
tvp3020xo(0x08, 0x00); /* Cursor RAM LS Address */
tvp3020xo(0x09, 0x00); /* Cursor RAM MS Address */
/*
* Initialise the 64x64 cursor RAM array. There are 2 planes,
* p0 and p1. Data is written 4 pixels per byte, with p1 the
* MS bit of each pixel.
* The cursor is set in X-Windows mode which gives the following
* truth table:
* p1 p0 colour
* 0 0 underlying pixel colour
* 0 1 underlying pixel colour
* 1 0 cursor colour 1
* 1 1 cursor colour 2
* Put the cursor into the top-left of the 64x64 array.
*/
for(y = 0; y < 64; y++){
for(x = 0; x < 64/8; x++){
if(x < 16/8 && y < 16){
p0 = curs->clr[x+y*2];
p1 = curs->set[x+y*2];
p = 0x00;
if(p1 & 0x10)
p |= 0x03;
else if(p0 & 0x10)
p |= 0x02;
if(p1 & 0x20)
p |= 0x0C;
else if(p0 & 0x20)
p |= 0x08;
if(p1 & 0x40)
p |= 0x30;
else if(p0 & 0x40)
p |= 0x20;
if(p1 & 0x80)
p |= 0xC0;
else if(p0 & 0x80)
p |= 0x80;
tvp3020xo(0x0A, p); /* Cursor RAM Data */
p = 0x00;
if(p1 & 0x01)
p |= 0x03;
else if(p0 & 0x01)
p |= 0x02;
if(p1 & 0x02)
p |= 0x0C;
else if(p0 & 0x02)
p |= 0x08;
if(p1 & 0x04)
p |= 0x30;
else if(p0 & 0x04)
p |= 0x20;
if(p1 & 0x08)
p |= 0xC0;
else if(p0 & 0x08)
p |= 0x80;
tvp3020xo(0x0A, p); /* Cursor RAM Data */
}
else{
tvp3020xo(0x0A, 0x00); /* Cursor RAM Data */
tvp3020xo(0x0A, 0x00);
}
}
}
/*
* Initialise the cursor hotpoint
* and enable the cursor.
*/
tvp3020xo(0x04, -curs->offset.x); /* Sprite Origin X */
tvp3020xo(0x05, -curs->offset.y); /* Sprite Origin Y */
tvp3020xo(0x06, 0x40|0x10); /* Cursor Control Register */
}
static int
tvp3020move(VGAscr*, Point p)
{
tvp3020xo(0x00, p.x & 0xFF); /* Cursor Position X LSB */
tvp3020xo(0x01, (p.x>>8) & 0x0F); /* Cursor Position X MSB */
tvp3020xo(0x02, p.y & 0xFF); /* Cursor Position Y LSB */
tvp3020xo(0x03, (p.y>>8) & 0x0F); /* Cursor Position Y MSB */
return 0;
}
VGAcur vgatvp3020cur = {
"tvp3020hwgc",
tvp3020enable,
tvp3020disable,
tvp3020load,
tvp3020move,
};
|
