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
|
#include <camellia/syscalls.h>
#include <stdlib.h>
struct framebuf {
size_t len, width, height, pitch;
char *b;
};
struct framebuf fb;
handle_t fb_fd;
struct rect {
uint32_t x1, y1, x2, y2;
};
struct rect dirty;
void dirty_mark(uint32_t x, uint32_t y) {
if (dirty.x1 > x) dirty.x1 = x;
if (dirty.x2 < x) dirty.x2 = x;
if (dirty.y1 > y) dirty.y1 = y;
if (dirty.y2 < y) dirty.y2 = y;
}
void flush(void) {
size_t low, high;
if (~dirty.x1 == 0) return;
// not optimal, on larger display widths it'd be more efficient to split this up into multiple writes
low = fb.pitch * (dirty.y1 ) + 4 * (dirty.x1 );
high = fb.pitch * (dirty.y2+1) + 4 * (dirty.x2+1) + 3;
if (~dirty.y2 == 0) high = fb.len;
if (high > fb.len) high = fb.len;
_syscall_write(fb_fd, fb.b + low, high - low, low, 0);
dirty.x1 = ~0; dirty.y1 = ~0;
dirty.x2 = 0; dirty.y2 = 0;
}
void draw_rect(uint32_t x, uint32_t y, uint32_t w, uint32_t h, uint32_t col) {
for (uint32_t i = 0; i < w; i++) {
for (uint32_t j = 0; j < h; j++) {
*((uint32_t*)(fb.b + fb.pitch * (y+j) + 4 * (x+i))) = col;
}
}
if (dirty.x1 > x) dirty.x1 = x;
if (dirty.y1 > y) dirty.y1 = y;
if (dirty.x2 < x + w) dirty.x2 = x + w;
if (dirty.y2 < y + h) dirty.y2 = y + h;
}
int main(void) {
fb_fd = _syscall_open("/kdev/video/b", 13, 0);
// TODO don't hardcode framebuffer size
fb.len = 640 * 480 * 4;
fb.width = 640;
fb.height = 480;
fb.pitch = 640 * 4;
fb.b = malloc(fb.len);
int dx = 2, dy = 2, x = 100, y = 100, w = 150, h = 70;
uint32_t col = 0x800000;
for (;;) {
if (x + dx < 0 || x + dx + w >= fb.width ) dx *= -1;
if (y + dy < 0 || y + dy + h >= fb.height) dy *= -1;
x += dx;
y += dy;
draw_rect(x, y, w, h, col++);
flush();
_syscall_sleep(1000 / 60);
}
return 1;
}
|
