src/c/desktop-internal.h

1/*

2 * desktop-internal.h - Internal header for the Sigil desktop host layer

3 *

4 * Application state for the window, GL context, input, frame clock and

5 * quit handling. The host is GLFW (vendored under vendor/glfw); the

6 * platform (Wayland or X11 on Linux, Win32, Cocoa) is picked at startup

7 * and every platform library is loaded at runtime by GLFW itself.

8 */

10#ifndef SIGIL_DESKTOP_INTERNAL_H

11#define SIGIL_DESKTOP_INTERNAL_H

13#include <sigil/sigil.h>

14#include <stdbool.h>

16/* GLFW_KEY_LAST is 348; sokol_app's table was 512 and the key symbols

17 * only ever map into the GLFW range, so the same size is kept. */

18#define SIGIL_DESKTOP_MAX_KEYS 512

19#define SIGIL_DESKTOP_MAX_MOUSE_BUTTONS 3

21struct GLFWwindow;

23/*

24 * Application state

25 */

26typedef struct {

27 SigilVM *vm;

29 /* Callbacks from Scheme */

30 Value init_callback;

31 Value frame_callback;

32 Value cleanup_callback;

34 /* The window and its GL context */

35 struct GLFWwindow *window;

37 /* Sizes: the framebuffer in pixels (what GL draws into and what

38 * frame-width/frame-height report), the window in screen units (what

39 * GLFW reports cursor positions in). They differ on a scaled Wayland

40 * output; framebuffer / window is the device pixel ratio. */

41 int fb_width;

42 int fb_height;

43 int win_width;

44 int win_height;

46 /* Frame timing */

47 double last_time; /* glfwGetTime() at the previous frame */

48 double frame_time; /* Seconds since last frame */

49 double time_elapsed; /* Seconds since app start */

51 /* Input state - current frame */

52 bool keys_down[SIGIL_DESKTOP_MAX_KEYS];

53 bool keys_pressed[SIGIL_DESKTOP_MAX_KEYS];

54 bool keys_released[SIGIL_DESKTOP_MAX_KEYS];

56 bool mouse_buttons[SIGIL_DESKTOP_MAX_MOUSE_BUTTONS];

57 bool mouse_pressed[SIGIL_DESKTOP_MAX_MOUSE_BUTTONS];

58 bool mouse_released[SIGIL_DESKTOP_MAX_MOUSE_BUTTONS];

59 /* Cursor position in window (screen) units as GLFW reports it;

60 * mouse-x / mouse-y scale it into framebuffer pixels on read. */

61 double cursor_x;

62 double cursor_y;

63 /* The wheel since the last frame (0.10.2): GLFW's scroll offsets

64 * summed, cleared with the other per-frame input; + is up/right. */

65 double wheel_x;

66 double wheel_y;

68 /* Quit handling */

69 bool quit_requested;

70} DesktopState;

72/* Global state - initialized by app module */

73extern DesktopState *g_desktop;

75/* Initialize/shutdown app state */

76void sigil_desktop_state_init(SigilVM *vm);

77void sigil_desktop_state_shutdown(void);

79/* Input handling helpers */

80void sigil_desktop_clear_frame_input(void);

81int sigil_desktop_key_code_from_symbol(SigilVM *vm, Value sym);

83/* Framebuffer size in pixels (1x1 before the window exists). */

84int sigil_desktop_framebuffer_width(void);

85int sigil_desktop_framebuffer_height(void);

87#if defined(__linux__)

88/* dl-search.c: the directories the interposed dlopen falls back to. */

89const char *sigil_desktop_dlopen_search_summary(void);

90#endif

92#endif /* SIGIL_DESKTOP_INTERNAL_H */