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
|
#include "common.h"
static u32 *framebuffer = 0;
#define SCREEN_WIDTH 800
#define SCREEN_HEIGHT 600
static u32 palette[4];
void
ppu_init(void) {
// Initialize the framebuffer.
static MboxFramebufferRequest fb_request = {
.buf_size = 96,
.code = MBOX_REQUEST,
.screen_tag = {
.header = {
.id = 0x48003,
.buf_size = 8,
},
.width = SCREEN_WIDTH,
.height = SCREEN_HEIGHT,
},
.virtual_screen_tag = {
.header = {
.id = 0x48004,
.buf_size = 8,
},
.width = SCREEN_WIDTH,
.height = SCREEN_HEIGHT,
},
.depth_tag = {
.header = {
.id = 0x48005,
.buf_size = 4,
},
.depth = 32,
},
.framebuffer_tag = {
.header = {
.id = 0x40001,
.buf_size = 8,
},
.fb_addr = 0,
.fb_size = 0,
}
};
if (mb_call(MBOX_CH_PROP, &fb_request)
&& fb_request.depth_tag.depth == 32
&& fb_request.framebuffer_tag.fb_addr != 0) {
fb_request.framebuffer_tag.fb_addr &= 0x3FFFFFFF;
framebuffer = (u32*)((uintptr_t)fb_request.framebuffer_tag.fb_addr);
} else {
uart_puts("Unable initialize framebuffer\n");
return;
}
// Initialize default palette.
palette[0] = 0x00444444;
palette[1] = 0x00ffffff;
palette[2] = 0x007777ff;
palette[3] = 0x00ff7777;
}
|
