aboutsummaryrefslogtreecommitdiff
path: root/nuklear/demo/x11/main.c
blob: 8f4b12c73c8d0fa5c6e24bdfc2ccad0206224a93 (plain)
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
/* nuklear - v1.17 - public domain */
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <limits.h>
#include <math.h>
#include <sys/time.h>
#include <unistd.h>
#include <time.h>

#define NK_INCLUDE_FIXED_TYPES
#define NK_INCLUDE_STANDARD_IO
#define NK_INCLUDE_STANDARD_VARARGS
#define NK_INCLUDE_DEFAULT_ALLOCATOR
#define NK_IMPLEMENTATION
#define NK_XLIB_IMPLEMENTATION
#include "../../nuklear.h"
#include "nuklear_xlib.h"

#define DTIME           20
#define WINDOW_WIDTH    800
#define WINDOW_HEIGHT   600

#define UNUSED(a) (void)a
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define MAX(a,b) ((a) < (b) ? (b) : (a))
#define LEN(a) (sizeof(a)/sizeof(a)[0])

typedef struct XWindow XWindow;
struct XWindow {
    Display *dpy;
    Window root;
    Visual *vis;
    Colormap cmap;
    XWindowAttributes attr;
    XSetWindowAttributes swa;
    Window win;
    int screen;
    XFont *font;
    unsigned int width;
    unsigned int height;
};

static void
die(const char *fmt, ...)
{
    va_list ap;
    va_start(ap, fmt);
    vfprintf(stderr, fmt, ap);
    va_end(ap);
    fputs("\n", stderr);
    exit(EXIT_FAILURE);
}

static void*
xcalloc(size_t siz, size_t n)
{
    void *ptr = calloc(siz, n);
    if (!ptr) die("Out of memory\n");
    return ptr;
}

static long
timestamp(void)
{
    struct timeval tv;
    if (gettimeofday(&tv, NULL) < 0) return 0;
    return (long)((long)tv.tv_sec * 1000 + (long)tv.tv_usec/1000);
}

static void
sleep_for(long t)
{
    struct timespec req;
    const time_t sec = (int)(t/1000);
    const long ms = t - (sec * 1000);
    req.tv_sec = sec;
    req.tv_nsec = ms * 1000000L;
    while(-1 == nanosleep(&req, &req));
}

/* ===============================================================
 *
 *                          EXAMPLE
 *
 * ===============================================================*/
/* This are some code examples to provide a small overview of what can be
 * done with this library. To try out an example uncomment the include
 * and the corresponding function. */
/*#include "../style.c"*/
/*#include "../calculator.c"*/
#include "../overview.c"
#include "../node_editor.c"

/* ===============================================================
 *
 *                          DEMO
 *
 * ===============================================================*/
int
main(void)
{
    long dt;
    long started;
    int running = 1;
    XWindow xw;
    struct nk_context *ctx;

    /* X11 */
    memset(&xw, 0, sizeof xw);
    xw.dpy = XOpenDisplay(NULL);
    if (!xw.dpy) die("Could not open a display; perhaps $DISPLAY is not set?");

    xw.root = DefaultRootWindow(xw.dpy);
    xw.screen = XDefaultScreen(xw.dpy);
    xw.vis = XDefaultVisual(xw.dpy, xw.screen);
    xw.cmap = XCreateColormap(xw.dpy,xw.root,xw.vis,AllocNone);
    xw.swa.colormap = xw.cmap;
    xw.swa.event_mask =
        ExposureMask | KeyPressMask | KeyReleaseMask |
        ButtonPress | ButtonReleaseMask| ButtonMotionMask |
        Button1MotionMask | Button3MotionMask | Button4MotionMask | Button5MotionMask|
        PointerMotionMask | KeymapStateMask;
    xw.win = XCreateWindow(xw.dpy, xw.root, 0, 0, WINDOW_WIDTH, WINDOW_HEIGHT, 0,
        XDefaultDepth(xw.dpy, xw.screen), InputOutput,
        xw.vis, CWEventMask | CWColormap, &xw.swa);
    XStoreName(xw.dpy, xw.win, "X11");
    XMapWindow(xw.dpy, xw.win);
    XGetWindowAttributes(xw.dpy, xw.win, &xw.attr);
    xw.width = (unsigned int)xw.attr.width;
    xw.height = (unsigned int)xw.attr.height;

    /* GUI */
    xw.font = nk_xfont_create(xw.dpy, "fixed");
    ctx = nk_xlib_init(xw.font, xw.dpy, xw.screen, xw.win, xw.width, xw.height);

    /* style.c */
    /*set_style(ctx, THEME_WHITE);*/
    /*set_style(ctx, THEME_RED);*/
    /*set_style(ctx, THEME_BLUE);*/
    /*set_style(ctx, THEME_DARK);*/

    while (running)
    {
        /* Input */
        XEvent evt;
        started = timestamp();
        nk_input_begin(ctx);
        while (XCheckWindowEvent(xw.dpy, xw.win, xw.swa.event_mask, &evt)){
            if (XFilterEvent(&evt, xw.win)) continue;
            nk_xlib_handle_event(xw.dpy, xw.screen, xw.win, &evt);
        }
        nk_input_end(ctx);

        /* GUI */
        if (nk_begin(ctx, "Demo", nk_rect(50, 50, 200, 200),
            NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
            NK_WINDOW_CLOSABLE|NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
        {
            enum {EASY, HARD};
            static int op = EASY;
            static int property = 20;

            nk_layout_row_static(ctx, 30, 80, 1);
            if (nk_button_label(ctx, "button"))
                fprintf(stdout, "button pressed\n");
            nk_layout_row_dynamic(ctx, 30, 2);
            if (nk_option_label(ctx, "easy", op == EASY)) op = EASY;
            if (nk_option_label(ctx, "hard", op == HARD)) op = HARD;
            nk_layout_row_dynamic(ctx, 25, 1);
            nk_property_int(ctx, "Compression:", 0, &property, 100, 10, 1);
        }
        nk_end(ctx);
        if (nk_window_is_closed(ctx, "Demo")) break;

        /* -------------- EXAMPLES ---------------- */
        /*calculator(ctx);*/
        overview(ctx);
        node_editor(ctx);
        /* ----------------------------------------- */

        /* Draw */
        XClearWindow(xw.dpy, xw.win);
        nk_xlib_render(xw.win, nk_rgb(30,30,30));
        XFlush(xw.dpy);

        /* Timing */
        dt = timestamp() - started;
        if (dt < DTIME)
            sleep_for(DTIME - dt);
    }

    nk_xfont_del(xw.dpy, xw.font);
    nk_xlib_shutdown();
    XUnmapWindow(xw.dpy, xw.win);
    XFreeColormap(xw.dpy, xw.cmap);
    XDestroyWindow(xw.dpy, xw.win);
    XCloseDisplay(xw.dpy);
    return 0;
}