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Diffstat (limited to 'pugl/pugl.h')
| -rw-r--r-- | pugl/pugl.h | 622 |
1 files changed, 622 insertions, 0 deletions
diff --git a/pugl/pugl.h b/pugl/pugl.h new file mode 100644 index 0000000..1b22260 --- /dev/null +++ b/pugl/pugl.h @@ -0,0 +1,622 @@ +/* + Copyright 2012-2016 David Robillard <http://drobilla.net> + + Permission to use, copy, modify, and/or distribute this software for any + purpose with or without fee is hereby granted, provided that the above + copyright notice and this permission notice appear in all copies. + + THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +/** + @file pugl.h API for Pugl, a minimal portable API for OpenGL. +*/ + +#ifndef PUGL_H_INCLUDED +#define PUGL_H_INCLUDED + +#include <stdint.h> + +#ifdef PUGL_SHARED +# ifdef _WIN32 +# define PUGL_LIB_IMPORT __declspec(dllimport) +# define PUGL_LIB_EXPORT __declspec(dllexport) +# else +# define PUGL_LIB_IMPORT __attribute__((visibility("default"))) +# define PUGL_LIB_EXPORT __attribute__((visibility("default"))) +# endif +# ifdef PUGL_INTERNAL +# define PUGL_API PUGL_LIB_EXPORT +# else +# define PUGL_API PUGL_LIB_IMPORT +# endif +#else +# define PUGL_API +#endif + +#ifdef __cplusplus +extern "C" { +#else +# include <stdbool.h> +#endif + +/** + @defgroup pugl Pugl + A minimal portable API for OpenGL. + @{ +*/ + +/** + A Pugl view. +*/ +typedef struct PuglViewImpl PuglView; + +/** + A native window handle. + + On X11, this is a Window. + On OSX, this is an NSView*. + On Windows, this is a HWND. +*/ +typedef intptr_t PuglNativeWindow; + +/** + Handle for opaque user data. +*/ +typedef void* PuglHandle; + +/** + Return status code. +*/ +typedef enum { + PUGL_SUCCESS = 0 +} PuglStatus; + +/** + Drawing context type. +*/ +typedef enum { + PUGL_GL = 0x1, + PUGL_CAIRO = 0x2, + PUGL_CAIRO_GL = 0x3 +} PuglContextType; + +/** + Convenience symbols for ASCII control characters. +*/ +typedef enum { + PUGL_CHAR_BACKSPACE = 0x08, + PUGL_CHAR_ESCAPE = 0x1B, + PUGL_CHAR_DELETE = 0x7F +} PuglChar; + +/** + Keyboard modifier flags. +*/ +typedef enum { + PUGL_MOD_SHIFT = 1, /**< Shift key */ + PUGL_MOD_CTRL = 1 << 1, /**< Control key */ + PUGL_MOD_ALT = 1 << 2, /**< Alt/Option key */ + PUGL_MOD_SUPER = 1 << 3 /**< Mod4/Command/Windows key */ +} PuglMod; + +/** + Special (non-Unicode) keyboard keys. + + The numerical values of these symbols occupy a reserved range of Unicode + points, so it is possible to express either a PuglKey value or a Unicode + character in the same variable. This is sometimes useful for interfacing + with APIs that do not make this distinction. +*/ +typedef enum { + PUGL_KEY_F1 = 0xE000, + PUGL_KEY_F2, + PUGL_KEY_F3, + PUGL_KEY_F4, + PUGL_KEY_F5, + PUGL_KEY_F6, + PUGL_KEY_F7, + PUGL_KEY_F8, + PUGL_KEY_F9, + PUGL_KEY_F10, + PUGL_KEY_F11, + PUGL_KEY_F12, + PUGL_KEY_LEFT, + PUGL_KEY_UP, + PUGL_KEY_RIGHT, + PUGL_KEY_DOWN, + PUGL_KEY_PAGE_UP, + PUGL_KEY_PAGE_DOWN, + PUGL_KEY_HOME, + PUGL_KEY_END, + PUGL_KEY_INSERT, + PUGL_KEY_SHIFT, + PUGL_KEY_CTRL, + PUGL_KEY_ALT, + PUGL_KEY_SUPER +} PuglKey; + +/** + The type of a PuglEvent. +*/ +typedef enum { + PUGL_NOTHING, /**< No event */ + PUGL_BUTTON_PRESS, /**< Mouse button press */ + PUGL_BUTTON_RELEASE, /**< Mouse button release */ + PUGL_CONFIGURE, /**< View moved and/or resized */ + PUGL_EXPOSE, /**< View exposed, redraw required */ + PUGL_CLOSE, /**< Close view */ + PUGL_KEY_PRESS, /**< Key press */ + PUGL_KEY_RELEASE, /**< Key release */ + PUGL_ENTER_NOTIFY, /**< Pointer entered view */ + PUGL_LEAVE_NOTIFY, /**< Pointer left view */ + PUGL_MOTION_NOTIFY, /**< Pointer motion */ + PUGL_SCROLL, /**< Scroll */ + PUGL_FOCUS_IN, /**< Keyboard focus entered view */ + PUGL_FOCUS_OUT /**< Keyboard focus left view */ +} PuglEventType; + +typedef enum { + PUGL_IS_SEND_EVENT = 1 +} PuglEventFlag; + +/** + Reason for a PuglEventCrossing. +*/ +typedef enum { + PUGL_CROSSING_NORMAL, /**< Crossing due to pointer motion. */ + PUGL_CROSSING_GRAB, /**< Crossing due to a grab. */ + PUGL_CROSSING_UNGRAB /**< Crossing due to a grab release. */ +} PuglCrossingMode; + +/** + Common header for all event structs. +*/ +typedef struct { + PuglEventType type; /**< Event type. */ + PuglView* view; /**< View that received this event. */ + uint32_t flags; /**< Bitwise OR of PuglEventFlag values. */ +} PuglEventAny; + +/** + Button press or release event. + + For event types PUGL_BUTTON_PRESS and PUGL_BUTTON_RELEASE. +*/ +typedef struct { + PuglEventType type; /**< PUGL_BUTTON_PRESS or PUGL_BUTTON_RELEASE. */ + PuglView* view; /**< View that received this event. */ + uint32_t flags; /**< Bitwise OR of PuglEventFlag values. */ + uint32_t time; /**< Time in milliseconds. */ + double x; /**< View-relative X coordinate. */ + double y; /**< View-relative Y coordinate. */ + double x_root; /**< Root-relative X coordinate. */ + double y_root; /**< Root-relative Y coordinate. */ + unsigned state; /**< Bitwise OR of PuglMod flags. */ + unsigned button; /**< 1-relative button number. */ +} PuglEventButton; + +/** + Configure event for when window size or position has changed. +*/ +typedef struct { + PuglEventType type; /**< PUGL_CONFIGURE. */ + PuglView* view; /**< View that received this event. */ + uint32_t flags; /**< Bitwise OR of PuglEventFlag values. */ + double x; /**< New parent-relative X coordinate. */ + double y; /**< New parent-relative Y coordinate. */ + double width; /**< New width. */ + double height; /**< New height. */ +} PuglEventConfigure; + +/** + Expose event for when a region must be redrawn. +*/ +typedef struct { + PuglEventType type; /**< PUGL_EXPOSE. */ + PuglView* view; /**< View that received this event. */ + uint32_t flags; /**< Bitwise OR of PuglEventFlag values. */ + double x; /**< View-relative X coordinate. */ + double y; /**< View-relative Y coordinate. */ + double width; /**< Width of exposed region. */ + double height; /**< Height of exposed region. */ + int count; /**< Number of expose events to follow. */ +} PuglEventExpose; + +/** + Window close event. +*/ +typedef struct { + PuglEventType type; /**< PUGL_CLOSE. */ + PuglView* view; /**< View that received this event. */ + uint32_t flags; /**< Bitwise OR of PuglEventFlag values. */ +} PuglEventClose; + +/** + Key press/release event. + + Keys that correspond to a Unicode character have `character` and `utf8` set. + Other keys will have `character` 0, but `special` may be set if this is a + known special key. + + A key press may be part of a multi-key sequence to generate a wide + character. If `filter` is set, this event is part of a multi-key sequence + and should be ignored if the application is reading textual input. + Following the series of filtered press events, a press event with + `character` and `utf8` (but `keycode` 0) will be sent. This event will have + no corresponding release event. + + Generally, an application should either work with raw keyboard press/release + events based on `keycode` (ignoring events with `keycode` 0), or + read textual input based on `character` or `utf8` (ignoring releases and + events with `filter` 1). Note that blindly appending `utf8` will yield + incorrect text, since press events are sent for both individually composed + keys and the resulting synthetic multi-byte press. +*/ +typedef struct { + PuglEventType type; /**< PUGL_KEY_PRESS or PUGL_KEY_RELEASE. */ + PuglView* view; /**< View that received this event. */ + uint32_t flags; /**< Bitwise OR of PuglEventFlag values. */ + uint32_t time; /**< Time in milliseconds. */ + double x; /**< View-relative X coordinate. */ + double y; /**< View-relative Y coordinate. */ + double x_root; /**< Root-relative X coordinate. */ + double y_root; /**< Root-relative Y coordinate. */ + unsigned state; /**< Bitwise OR of PuglMod flags. */ + unsigned keycode; /**< Raw key code. */ + uint32_t character; /**< Unicode character code, or 0. */ + PuglKey special; /**< Special key, or 0. */ + uint8_t utf8[8]; /**< UTF-8 string. */ + bool filter; /**< True if part of a multi-key sequence. */ +} PuglEventKey; + +/** + Pointer crossing event (enter and leave). +*/ +typedef struct { + PuglEventType type; /**< PUGL_ENTER_NOTIFY or PUGL_LEAVE_NOTIFY. */ + PuglView* view; /**< View that received this event. */ + uint32_t flags; /**< Bitwise OR of PuglEventFlag values. */ + uint32_t time; /**< Time in milliseconds. */ + double x; /**< View-relative X coordinate. */ + double y; /**< View-relative Y coordinate. */ + double x_root; /**< Root-relative X coordinate. */ + double y_root; /**< Root-relative Y coordinate. */ + unsigned state; /**< Bitwise OR of PuglMod flags. */ + PuglCrossingMode mode; /**< Reason for crossing. */ +} PuglEventCrossing; + +/** + Pointer motion event. +*/ +typedef struct { + PuglEventType type; /**< PUGL_MOTION_NOTIFY. */ + PuglView* view; /**< View that received this event. */ + uint32_t flags; /**< Bitwise OR of PuglEventFlag values. */ + uint32_t time; /**< Time in milliseconds. */ + double x; /**< View-relative X coordinate. */ + double y; /**< View-relative Y coordinate. */ + double x_root; /**< Root-relative X coordinate. */ + double y_root; /**< Root-relative Y coordinate. */ + unsigned state; /**< Bitwise OR of PuglMod flags. */ + bool is_hint; /**< True iff this event is a motion hint. */ + bool focus; /**< True iff this is the focused window. */ +} PuglEventMotion; + +/** + Scroll event. + + The scroll distance is expressed in "lines", an arbitrary unit that + corresponds to a single tick of a detented mouse wheel. For example, `dy` = + 1.0 scrolls 1 line up. Some systems and devices support finer resolution + and/or higher values for fast scrolls, so programs should handle any value + gracefully. + */ +typedef struct { + PuglEventType type; /**< PUGL_SCROLL. */ + PuglView* view; /**< View that received this event. */ + uint32_t flags; /**< Bitwise OR of PuglEventFlag values. */ + uint32_t time; /**< Time in milliseconds. */ + double x; /**< View-relative X coordinate. */ + double y; /**< View-relative Y coordinate. */ + double x_root; /**< Root-relative X coordinate. */ + double y_root; /**< Root-relative Y coordinate. */ + unsigned state; /**< Bitwise OR of PuglMod flags. */ + double dx; /**< Scroll X distance in lines. */ + double dy; /**< Scroll Y distance in lines. */ +} PuglEventScroll; + +/** + Keyboard focus event. +*/ +typedef struct { + PuglEventType type; /**< PUGL_FOCUS_IN or PUGL_FOCUS_OUT. */ + PuglView* view; /**< View that received this event. */ + uint32_t flags; /**< Bitwise OR of PuglEventFlag values. */ + bool grab; /**< True iff this is a grab/ungrab event. */ +} PuglEventFocus; + +/** + Interface event. + + This is a union of all event structs. The `type` must be checked to + determine which fields are safe to access. A pointer to PuglEvent can + either be cast to the appropriate type, or the union members used. +*/ +typedef union { + PuglEventType type; /**< Event type. */ + PuglEventAny any; /**< Valid for all event types. */ + PuglEventButton button; /**< PUGL_BUTTON_PRESS, PUGL_BUTTON_RELEASE. */ + PuglEventConfigure configure; /**< PUGL_CONFIGURE. */ + PuglEventExpose expose; /**< PUGL_EXPOSE. */ + PuglEventClose close; /**< PUGL_CLOSE. */ + PuglEventKey key; /**< PUGL_KEY_PRESS, PUGL_KEY_RELEASE. */ + PuglEventCrossing crossing; /**< PUGL_ENTER_NOTIFY, PUGL_LEAVE_NOTIFY. */ + PuglEventMotion motion; /**< PUGL_MOTION_NOTIFY. */ + PuglEventScroll scroll; /**< PUGL_SCROLL. */ + PuglEventFocus focus; /**< PUGL_FOCUS_IN, PUGL_FOCUS_OUT. */ +} PuglEvent; + +/** + @name Initialization + Configuration functions which must be called before creating a window. + @{ +*/ + +/** + Create a Pugl view. + + To create a window, call the various puglInit* functions as necessary, then + call puglCreateWindow(). + + @param pargc Pointer to argument count (currently unused). + @param argv Arguments (currently unused). + @return A newly created view. +*/ +PUGL_API PuglView* +puglInit(int* pargc, char** argv); + +/** + Set the window class name before creating a window. +*/ +PUGL_API void +puglInitWindowClass(PuglView* view, const char* name); + +/** + Set the parent window before creating a window (for embedding). +*/ +PUGL_API void +puglInitWindowParent(PuglView* view, PuglNativeWindow parent); + +/** + Set the window size before creating a window. +*/ +PUGL_API void +puglInitWindowSize(PuglView* view, int width, int height); + +/** + Set the minimum window size before creating a window. +*/ +PUGL_API void +puglInitWindowMinSize(PuglView* view, int width, int height); + +/** + Set the window aspect ratio range before creating a window. + + The x and y values here represent a ratio of width to height. To set a + fixed aspect ratio, set the minimum and maximum values to the same ratio. +*/ +PUGL_API void +puglInitWindowAspectRatio(PuglView* view, + int min_x, + int min_y, + int max_x, + int max_y); + +/** + Enable or disable resizing before creating a window. +*/ +PUGL_API void +puglInitResizable(PuglView* view, bool resizable); + +/** + Set transient parent before creating a window. + + On X11, parent must be a Window. + On OSX, parent must be an NSView*. +*/ +PUGL_API void +puglInitTransientFor(PuglView* view, uintptr_t parent); + +/** + Set the context type before creating a window. +*/ +PUGL_API void +puglInitContextType(PuglView* view, PuglContextType type); + +/** + @} +*/ + +/** + @name Windows + Functions for creating and managing a visible window for a view. + @{ +*/ + +/** + Create a window with the settings given by the various puglInit functions. + + @return 1 (pugl does not currently support multiple windows). +*/ +PUGL_API int +puglCreateWindow(PuglView* view, const char* title); + +/** + Show the current window. +*/ +PUGL_API void +puglShowWindow(PuglView* view); + +/** + Hide the current window. +*/ +PUGL_API void +puglHideWindow(PuglView* view); + +/** + Return the native window handle. +*/ +PUGL_API PuglNativeWindow +puglGetNativeWindow(PuglView* view); + +/** + @} +*/ + +/** + Set the handle to be passed to all callbacks. + + This is generally a pointer to a struct which contains all necessary state. + Everything needed in callbacks should be here, not in static variables. +*/ +PUGL_API void +puglSetHandle(PuglView* view, PuglHandle handle); + +/** + Get the handle to be passed to all callbacks. +*/ +PUGL_API PuglHandle +puglGetHandle(PuglView* view); + +/** + Return true iff the view is currently visible. +*/ +PUGL_API bool +puglGetVisible(PuglView* view); + +/** + Get the current size of the view. +*/ +PUGL_API void +puglGetSize(PuglView* view, int* width, int* height); + +/** + @name Context + Functions for accessing the drawing context. + @{ +*/ + +/** + Get the drawing context. + + For PUGL_GL contexts, this is unused and returns NULL. + For PUGL_CAIRO contexts, this returns a pointer to a cairo_t. +*/ +PUGL_API void* +puglGetContext(PuglView* view); + + +/** + Enter the drawing context. + + This must be called before any code that accesses the drawing context, + including any GL functions. This is only necessary for code that does so + outside the usual draw callback or handling of an expose event. +*/ +PUGL_API void +puglEnterContext(PuglView* view); + +/** + Leave the drawing context. + + This must be called after puglEnterContext and applies the results of the + drawing code (for example, by swapping buffers). +*/ +PUGL_API void +puglLeaveContext(PuglView* view, bool flush); + +/** + @} +*/ + +/** + @name Event Handling + @{ +*/ + +/** + A function called when an event occurs. +*/ +typedef void (*PuglEventFunc)(PuglView* view, const PuglEvent* event); + +/** + Set the function to call when an event occurs. +*/ +PUGL_API void +puglSetEventFunc(PuglView* view, PuglEventFunc eventFunc); + +/** + Ignore synthetic repeated key events. +*/ +PUGL_API void +puglIgnoreKeyRepeat(PuglView* view, bool ignore); + +/** + Grab the input focus. +*/ +PUGL_API void +puglGrabFocus(PuglView* view); + +/** + Block and wait for an event to be ready. + + This can be used in a loop to only process events via puglProcessEvents when + necessary. This function will block indefinitely if no events are + available, so is not appropriate for use in programs that need to perform + regular updates (e.g. animation). +*/ +PUGL_API PuglStatus +puglWaitForEvent(PuglView* view); + +/** + Process all pending window events. + + This handles input events as well as rendering, so it should be called + regularly and rapidly enough to keep the UI responsive. This function does + not block if no events are pending. +*/ +PUGL_API PuglStatus +puglProcessEvents(PuglView* view); + +/** + @} +*/ + +/** + Request a redisplay on the next call to puglProcessEvents(). +*/ +PUGL_API void +puglPostRedisplay(PuglView* view); + +/** + Destroy a GL window. +*/ +PUGL_API void +puglDestroy(PuglView* view); + +/** + @} +*/ + +#ifdef __cplusplus +} /* extern "C" */ +#endif + +#endif /* PUGL_H_INCLUDED */ |