Barclay/test_server_bug.cpp at master · croepha/Barclay · GitHub

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
// Copyright 2019 David Butler <croepha@gmail.com>

#include <stdio.h>
#include <unistd.h>

#include <assert.h>
#include <errno.h>

#include <sys/mman.h>
#include <sys/stat.h>        /* For mode constants */
#include <fcntl.h>           /* For O_* constants */

#include "util_types.hpp"


struct ClientBitmapSpec {
    s32 w;
    s32 h;

    static const s32 bytes_per_px            = 4;
    inline s32 pitch              (){ return w * bytes_per_px; }
    inline u64 single_buffer_bytes(){ return (u64)(pitch() * h); }
    inline u64 double_buffer_bytes(){ return single_buffer_bytes() * 2; }
};


int main () {

    s32       bitmap_fd;
    s32       x, y, w, h;
    void*     bitmap_front = 0;
    void*     bitmap_back  = 0;


    y = 50;
    x = 50;
    w = 600;
    h = 300;
    bitmap_fd     = -1;


    int debug_client_count = 0;
    (void)debug_client_count;


    size_t bitmap_size = 0;

    for (;;) {
        // TODO: cleanup mouse code


        h++;
        if (h > 700) {
            h = 50;
        }

        ClientBitmapSpec _spec = {.w = w, .h = h};


        auto _m = min_of(bitmap_front, bitmap_back);

        if (bitmap_size) {
            auto r20 = munmap(_m, bitmap_size);
            assert(r20 == 0);
        }

        if(bitmap_fd != -1) {
            auto r21 = close(bitmap_fd);
            assert(r21 == 0);
        }
        bitmap_front  = 0;
        bitmap_back   = 0;


        assert(w > 0);
        assert(h > 0);


        bitmap_size = _spec.double_buffer_bytes();


        // TODO: Look into File sealing (If we care about security at some point)
        bitmap_fd =  memfd_create("client_bitmap", MFD_CLOEXEC);
        assert(bitmap_fd != -1);

        auto r14 = ftruncate(bitmap_fd, (__off_t)bitmap_size);
        assert(!r14);


        //  MAP_32BIT
        //  (void*)0x500000000000

        auto mapflags = MAP_SHARED;
        //  mapflags |= MAP_32BIT;

        auto bitmap = (u8*)mmap(0, bitmap_size, PROT_READ, mapflags, bitmap_fd, 0);
        assert(bitmap != MAP_FAILED);

        bitmap_front = bitmap;
        bitmap_back  = bitmap + _spec.single_buffer_bytes();


        u64 sum = 0;
        for (s32 px = 0; px<w; px++) {
            for (s32 py = 0; py<h; py++) {

                auto client_row   = (u32*)(void*)(((u8*)bitmap_front) + _spec.pitch() * py);
                auto client_pixel = client_row + px;

                auto pix_value = *client_pixel;

                sum += pix_value;
            }
        }
        for (s32 px = 0; px<w; px++) {
            for (s32 py = 0; py<h; py++) {

                auto client_row   = (u32*)(void*)(((u8*)bitmap_back) + _spec.pitch() * py);
                auto client_pixel = client_row + px;

                auto pix_value = *client_pixel;

                sum += pix_value;
            }
        }

        printf("bitmap_initialize, %d, %d, %p %p\n",
               w, h,
               bitmap_front, bitmap_back);

        fflush(stdout);

    }


}