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
|
#pragma once
#include <stdbool.h>
typedef struct GfxAppState GfxAppState;
/// Application settings.
typedef struct GfxAppDesc {
int argc; // Number of application arguments.
const char** argv; // Application arguments.
int width; // Window width.
int height; // Window height.
int max_fps; // Desired maximum display framerate. 0 to disable.
double update_delta_time; // Desired delta time between frame updates.
const char* title; // Window title.
GfxAppState* app_state;
} GfxAppDesc;
typedef bool (*GfxAppInit)(GfxAppState*, int argc, const char** argv);
typedef void (*GfxAppShutdown)(GfxAppState*);
typedef void (*GfxAppUpdate)(GfxAppState*, double t, double dt);
typedef void (*GfxAppRender)(GfxAppState*);
typedef void (*GfxAppResize)(GfxAppState*, int width, int height);
/// Application callback functions.
typedef struct GfxAppCallbacks {
GfxAppInit init;
GfxAppShutdown shutdown;
GfxAppUpdate update;
GfxAppRender render;
GfxAppResize resize;
} GfxAppCallbacks;
typedef enum Key {
KeyA = 'a',
KeyB,
KeyC,
KeyD,
KeyE,
KeyF,
KeyG,
KeyH,
KeyI,
KeyJ,
KeyK,
KeyL,
KeyM,
KeyN,
KeyO,
KeyP,
KeyQ,
KeyR,
KeyS,
KeyT,
KeyU,
KeyV,
KeyW,
KeyX,
KeyY,
KeyZ,
} Key;
/// Create a window with an OpenGL context and run the main loop.
bool gfx_app_run(const GfxAppDesc*, const GfxAppCallbacks*);
/// Get the mouse coordinates relative to the app's window.
void gfx_app_get_mouse_position(double* x, double* y);
/// Return true if the given key is pressed.
bool gfx_is_key_pressed(Key);
/// Define a main function that initializes and puts the application in a loop.
/// See also: gfx_app_run().
#define GFX_APP_MAIN(WIDTH, HEIGHT, MAX_FPS, TITLE) \
int main(int argc, const char** argv) { \
GfxAppState app_state = {0}; \
gfx_app_run( \
&(GfxAppDesc){ \
.argc = argc, \
.argv = argv, \
.width = WIDTH, \
.height = HEIGHT, \
.max_fps = MAX_FPS, \
.update_delta_time = MAX_FPS > 0 ? 1.0 / (double)MAX_FPS : 0.0, \
.title = TITLE, \
.app_state = &app_state, \
}, \
&(GfxAppCallbacks){ \
.init = (GfxAppInit)app_init, \
.update = (GfxAppUpdate)app_update, \
.render = (GfxAppRender)app_render, \
.resize = (GfxAppResize)app_resize, \
.shutdown = (GfxAppShutdown)app_end}); \
return 0; \
}
|
