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Added support for custom system cursors.

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This adds 3 functions to the GLFW API: glfwCreateCursor,
glfwDestroyCursor and glfwSetCursor.
This commit is contained in:
urraka 2013-12-04 10:19:22 -03:00 committed by Camilla Berglund
parent 30f86286f5
commit 40c04a7565
14 changed files with 836 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
CMakeLists.txt
View File

@ -268,6 +268,15 @@ if (_GLFW_X11)
set(GLFW_PKG_LIBS "${GLFW_PKG_LIBS} -lm")
endif()
# Check for Xcursor
if (NOT X11_Xcursor_FOUND)
message(FATAL_ERROR "The Xcursor libraries and headers were not found")
endif()
list(APPEND glfw_INCLUDE_DIR ${X11_Xcursor_INCLUDE_PATH})
list(APPEND glfw_LIBRARIES ${X11_Xcursor_LIB})
set(GLFW_PKG_DEPS "${GLFW_PKG_DEPS} xcursor")
endif()
#--------------------------------------------------------------------

52
include/GLFW/glfw3.h
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@ -575,6 +575,14 @@ typedef struct GLFWmonitor GLFWmonitor;
*/
typedef struct GLFWwindow GLFWwindow;
/*! @brief Opaque cursor object.
*
* Opaque cursor object.
*
* @ingroup cursor
*/
typedef struct GLFWcursor GLFWcursor;
/*! @brief The function signature for error callbacks.
*
* This is the function signature for error callback functions.
@ -1926,6 +1934,50 @@ GLFWAPI void glfwGetCursorPos(GLFWwindow* window, double* xpos, double* ypos);
*/
GLFWAPI void glfwSetCursorPos(GLFWwindow* window, double xpos, double ypos);
/*! @brief Creates a cursor.
*
* @param[in] width The desired cursor width.
* @param[in] height The desired cursor height.
* @param[in] xhot The desired x-coordinate of the cursor hotspot.
* @param[in] yhot The desired y-coordinate of the cursor hotspot.
* @param[in] format Not used.
* @param[in] data The cursor image data in RGBA8 format, packed in rows from
* top to bottom.
*
* @return A new cursor ready to use or `NULL` if an error occurred. If you
* don't destroy the cursor by calling `glfwDestroyCursor` it will be destroyed
* automatically by `GLFW` on termination.
*
* @note This function may only be called from the main thread.
*
* @ingroup input
*/
GLFWAPI GLFWcursor* glfwCreateCursor(int width, int height, int xhot, int yhot, int format, const void* data);
/*! @brief Destroys a cursor.
*
* This function destroys a cursor previously created by a call to
* `glfwCreateCursor`. `GLFW` will destroy all cursors automatically on
* termination.
*
* @param[in] cursor The cursor to destroy.
*
* @note This function may only be called from the main thread.
*
* @ingroup input
*/
GLFWAPI void glfwDestroyCursor(GLFWcursor* cursor);
/*! @brief Sets the cursor for a given window.
*
* @param[in] window The window to set the cursor for.
* @param[in] cursor The cursor to change to, or `NULL` to switch back to the
* default system cursor.
*
* @ingroup input
*/
GLFWAPI void glfwSetCursor(GLFWwindow* window, GLFWcursor* cursor);
/*! @brief Sets the key callback.
*
* This function sets the key callback of the specific window, which is called

11
src/cocoa_platform.h
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@ -51,6 +51,7 @@ typedef void* id;
#define _GLFW_PLATFORM_WINDOW_STATE _GLFWwindowNS ns
#define _GLFW_PLATFORM_LIBRARY_WINDOW_STATE _GLFWlibraryNS ns
#define _GLFW_PLATFORM_MONITOR_STATE _GLFWmonitorNS ns
#define _GLFW_PLATFORM_CURSOR_STATE _GLFWcursorNS ns
//========================================================================
@ -67,6 +68,7 @@ typedef struct _GLFWwindowNS
id delegate;
id view;
unsigned int modifierFlags;
int cursorInside;
} _GLFWwindowNS;
@ -123,6 +125,15 @@ typedef struct _GLFWmonitorNS
} _GLFWmonitorNS;
//------------------------------------------------------------------------
// Platform-specific cursor structure
//------------------------------------------------------------------------
typedef struct _GLFWcursorNS
{
id handle;
} _GLFWcursorNS;
//========================================================================
// Prototypes for platform specific internal functions
//========================================================================

62
src/cocoa_window.m
View File

@ -44,7 +44,12 @@ static void centerCursor(_GLFWwindow *window)
static void setModeCursor(_GLFWwindow* window)
{
if (window->cursorMode == GLFW_CURSOR_NORMAL)
{
if (window->cursor)
[(NSCursor*) window->cursor->ns.handle set];
else
[[NSCursor arrowCursor] set];
}
else
[(NSCursor*) _glfw.ns.cursor set];
}
@ -556,11 +561,13 @@ static int translateKey(unsigned int key)
- (void)mouseExited:(NSEvent *)event
{
window->ns.cursorInside = GL_FALSE;
_glfwInputCursorEnter(window, GL_FALSE);
}
- (void)mouseEntered:(NSEvent *)event
{
window->ns.cursorInside = GL_TRUE;
_glfwInputCursorEnter(window, GL_TRUE);
}
@ -1194,6 +1201,61 @@ void _glfwPlatformApplyCursorMode(_GLFWwindow* window)
CGAssociateMouseAndMouseCursorPosition(true);
}
int _glfwPlatformCreateCursor(_GLFWcursor* cursor, int width, int height, int cx, int cy,
int format, const void* data)
{
NSImage* image;
NSBitmapImageRep* rep;
rep = [[NSBitmapImageRep alloc]
initWithBitmapDataPlanes:NULL
pixelsWide:width
pixelsHigh:height
bitsPerSample:8
samplesPerPixel:4
hasAlpha:YES
isPlanar:NO
colorSpaceName:NSCalibratedRGBColorSpace
bitmapFormat:NSAlphaNonpremultipliedBitmapFormat
bytesPerRow:width * 4
bitsPerPixel:32];
if (rep == nil)
return GL_FALSE;
memcpy([rep bitmapData], data, 4 * width * height);
image = [[NSImage alloc] initWithSize:NSMakeSize(width, height)];
[image addRepresentation: rep];
cursor->ns.handle = [[NSCursor alloc] initWithImage:image
hotSpot:NSMakePoint(cx, cy)];
[image release];
[rep release];
if (cursor->ns.handle == nil)
return GL_FALSE;
return GL_TRUE;
}
void _glfwPlatformDestroyCursor(_GLFWcursor* cursor)
{
[(NSCursor*) cursor->ns.handle release];
}
void _glfwPlatformSetCursor(_GLFWwindow* window, _GLFWcursor* cursor)
{
if (window->cursorMode == GLFW_CURSOR_NORMAL && window->ns.cursorInside)
{
if (cursor)
[(NSCursor*) cursor->ns.handle set];
else
[[NSCursor arrowCursor] set];
}
}
//////////////////////////////////////////////////////////////////////////
////// GLFW native API //////

4
src/init.c
View File

@ -156,6 +156,10 @@ GLFWAPI void glfwTerminate(void)
while (_glfw.windowListHead)
glfwDestroyWindow((GLFWwindow*) _glfw.windowListHead);
// Destroy all cursors
while (_glfw.cursorListHead)
glfwDestroyCursor((GLFWcursor*) _glfw.cursorListHead);
for (i = 0; i < _glfw.monitorCount; i++)
{
_GLFWmonitor* monitor = _glfw.monitors[i];

75
src/input.c
View File

@ -27,6 +27,11 @@
#include "internal.h"
#include <stdlib.h>
#if defined(_MSC_VER)
#include <malloc.h>
#endif
// Internal key state used for sticky keys
#define _GLFW_STICK 3
@ -348,6 +353,76 @@ GLFWAPI void glfwSetCursorPos(GLFWwindow* handle, double xpos, double ypos)
_glfwPlatformSetCursorPos(window, xpos, ypos);
}
GLFWAPI GLFWcursor* glfwCreateCursor(int width, int height, int cx, int cy,
int format, const void* data)
{
_GLFWcursor* cursor;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
cursor = calloc(1, sizeof(_GLFWcursor));
if (!_glfwPlatformCreateCursor(cursor, width, height, cx, cy, format, data))
{
free(cursor);
return NULL;
}
cursor->next = _glfw.cursorListHead;
_glfw.cursorListHead = cursor;
return (GLFWcursor*) cursor;
}
GLFWAPI void glfwDestroyCursor(GLFWcursor* handle)
{
_GLFWcursor* cursor = (_GLFWcursor*) handle;
_GLFW_REQUIRE_INIT();
if (cursor == NULL)
return;
// Make sure the cursor is not being used by any window
{
_GLFWwindow* window = _glfw.windowListHead;
while (window)
{
if (window->cursor == cursor)
glfwSetCursor((GLFWwindow*) window, NULL);
window = window->next;
}
}
_glfwPlatformDestroyCursor(cursor);
// Unlink cursor from global linked list
{
_GLFWcursor** prev = &_glfw.cursorListHead;
while (*prev != cursor)
prev = &((*prev)->next);
*prev = cursor->next;
}
free(cursor);
}
GLFWAPI void glfwSetCursor(GLFWwindow* windowHandle, GLFWcursor* cursorHandle)
{
_GLFWwindow* window = (_GLFWwindow*) windowHandle;
_GLFWcursor* cursor = (_GLFWcursor*) cursorHandle;
_GLFW_REQUIRE_INIT();
_glfwPlatformSetCursor(window, cursor);
window->cursor = cursor;
}
GLFWAPI GLFWkeyfun glfwSetKeyCallback(GLFWwindow* handle, GLFWkeyfun cbfun)
{
_GLFWwindow* window = (_GLFWwindow*) handle;

21
src/internal.h
View File

@ -65,6 +65,7 @@ typedef struct _GLFWfbconfig _GLFWfbconfig;
typedef struct _GLFWwindow _GLFWwindow;
typedef struct _GLFWlibrary _GLFWlibrary;
typedef struct _GLFWmonitor _GLFWmonitor;
typedef struct _GLFWcursor _GLFWcursor;
#if defined(_GLFW_COCOA)
#include "cocoa_platform.h"
@ -218,6 +219,7 @@ struct _GLFWwindow
void* userPointer;
GLFWvidmode videoMode;
_GLFWmonitor* monitor;
_GLFWcursor* cursor;
// Window input state
GLboolean stickyKeys;
@ -285,6 +287,17 @@ struct _GLFWmonitor
};
/*! @brief Cursor structure
*/
struct _GLFWcursor
{
_GLFWcursor* next;
// This is defined in the window API's platform.h
_GLFW_PLATFORM_CURSOR_STATE;
};
/*! @brief Library global data.
*/
struct _GLFWlibrary
@ -319,6 +332,8 @@ struct _GLFWlibrary
double cursorPosX, cursorPosY;
_GLFWcursor* cursorListHead;
_GLFWwindow* windowListHead;
_GLFWwindow* focusedWindow;
@ -573,6 +588,12 @@ int _glfwPlatformExtensionSupported(const char* extension);
*/
GLFWglproc _glfwPlatformGetProcAddress(const char* procname);
int _glfwPlatformCreateCursor(_GLFWcursor* cursor, int width, int height, int cx, int cy,
int format, const void* data);
void _glfwPlatformDestroyCursor(_GLFWcursor* cursor);
void _glfwPlatformSetCursor(_GLFWwindow* window, _GLFWcursor* cursor);
//========================================================================
// Event API functions

10
src/win32_platform.h
View File

@ -164,6 +164,7 @@ typedef HRESULT (WINAPI * DWMISCOMPOSITIONENABLED_T)(BOOL*);
#define _GLFW_PLATFORM_WINDOW_STATE _GLFWwindowWin32 win32
#define _GLFW_PLATFORM_LIBRARY_WINDOW_STATE _GLFWlibraryWin32 win32
#define _GLFW_PLATFORM_MONITOR_STATE _GLFWmonitorWin32 win32
#define _GLFW_PLATFORM_CURSOR_STATE _GLFWcursorWin32 win32
//========================================================================
@ -250,6 +251,15 @@ typedef struct _GLFWmonitorWin32
} _GLFWmonitorWin32;
//------------------------------------------------------------------------
// Platform-specific cursor structure
//------------------------------------------------------------------------
typedef struct _GLFWcursorWin32
{
HCURSOR handle;
} _GLFWcursorWin32;
//========================================================================
// Prototypes for platform specific internal functions
//========================================================================

93
src/win32_window.c
View File

@ -100,9 +100,14 @@ static void restoreCursor(_GLFWwindow* window)
if (GetCursorPos(&pos))
{
if (WindowFromPoint(pos) == window->win32.handle)
{
if (window->cursor)
SetCursor(window->cursor->win32.handle);
else
SetCursor(LoadCursorW(NULL, IDC_ARROW));
}
}
}
// Retrieves and translates modifier keys
//
@ -720,6 +725,11 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
SetCursor(NULL);
return TRUE;
}
else if (window->cursor)
{
SetCursor(window->cursor->win32.handle);
return TRUE;
}
}
break;
@ -1213,6 +1223,89 @@ void _glfwPlatformApplyCursorMode(_GLFWwindow* window)
}
}
int _glfwPlatformCreateCursor(_GLFWcursor* cursor, int width, int height, int cx, int cy,
int format, const void* data)
{
HDC hdc;
HBITMAP hBitmap, hMonoBitmap;
BITMAPV5HEADER bi;
ICONINFO ii;
DWORD *buffer = 0;
BYTE *image = (BYTE*) data;
int i, size = width * height;
ZeroMemory(&bi, sizeof(BITMAPV5HEADER));
bi.bV5Size = sizeof(BITMAPV5HEADER);
bi.bV5Width = width;
bi.bV5Height = -height;
bi.bV5Planes = 1;
bi.bV5BitCount = 32;
bi.bV5Compression = BI_BITFIELDS;
bi.bV5RedMask = 0x00FF0000;
bi.bV5GreenMask = 0x0000FF00;
bi.bV5BlueMask = 0x000000FF;
bi.bV5AlphaMask = 0xFF000000;
hdc = GetDC(NULL);
hBitmap = CreateDIBSection(hdc, (BITMAPINFO*) &bi, DIB_RGB_COLORS, (void**) &buffer,
NULL, (DWORD) 0);
ReleaseDC(NULL, hdc);
if (hBitmap == NULL)
return GL_FALSE;
hMonoBitmap = CreateBitmap(width, height, 1, 1, NULL);
if (hMonoBitmap == NULL)
{
DeleteObject(hBitmap);
return GL_FALSE;
}
for (i = 0; i < size; i++, buffer++, image += 4)
*buffer = (image[3] << 24) | (image[0] << 16) | (image[1] << 8) | image[2];
ii.fIcon = FALSE;
ii.xHotspot = cx;
ii.yHotspot = cy;
ii.hbmMask = hMonoBitmap;
ii.hbmColor = hBitmap;
cursor->win32.handle = (HCURSOR) CreateIconIndirect(&ii);
DeleteObject(hBitmap);
DeleteObject(hMonoBitmap);
if (cursor->win32.handle == NULL)
return GL_FALSE;
return GL_TRUE;
}
void _glfwPlatformDestroyCursor(_GLFWcursor* cursor)
{
DestroyIcon((HICON) cursor->win32.handle);
}
void _glfwPlatformSetCursor(_GLFWwindow* window, _GLFWcursor* cursor)
{
// It should be guaranteed that the cursor is not being used by this window if
// the following condition is not met. That way it should be safe to destroy the
// cursor after calling glfwSetCursor(window, NULL) on all windows using the cursor.
if (window->cursorMode == GLFW_CURSOR_NORMAL && _glfw.focusedWindow == window &&
window->win32.cursorInside)
{
if (cursor)
SetCursor(cursor->win32.handle);
else
SetCursor(LoadCursor(NULL, IDC_ARROW));
}
}
//////////////////////////////////////////////////////////////////////////
////// GLFW native API //////

11
src/x11_platform.h
View File

@ -34,6 +34,7 @@
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/Xatom.h>
#include <X11/Xcursor/Xcursor.h>
// The Xf86VidMode extension provides fallback gamma control
#include <X11/extensions/xf86vmode.h>
@ -62,6 +63,7 @@
#define _GLFW_PLATFORM_WINDOW_STATE _GLFWwindowX11 x11
#define _GLFW_PLATFORM_LIBRARY_WINDOW_STATE _GLFWlibraryX11 x11
#define _GLFW_PLATFORM_MONITOR_STATE _GLFWmonitorX11 x11
#define _GLFW_PLATFORM_CURSOR_STATE _GLFWcursorX11 x11
//========================================================================
@ -232,6 +234,15 @@ typedef struct _GLFWmonitorX11
} _GLFWmonitorX11;
//------------------------------------------------------------------------
// Platform-specific cursor structure
//------------------------------------------------------------------------
typedef struct _GLFWcursorX11
{
Cursor handle;
} _GLFWcursorX11;
//========================================================================
// Prototypes for platform specific internal functions
//========================================================================

56
src/x11_window.c
View File

@ -394,6 +394,13 @@ static void disableCursor(_GLFWwindow* window)
static void restoreCursor(_GLFWwindow* window)
{
XUngrabPointer(_glfw.x11.display, CurrentTime);
if (window->cursor)
{
XDefineCursor(_glfw.x11.display, window->x11.handle,
window->cursor->x11.handle);
}
else
XUndefineCursor(_glfw.x11.display, window->x11.handle);
}
@ -1349,6 +1356,55 @@ void _glfwPlatformApplyCursorMode(_GLFWwindow* window)
}
}
int _glfwPlatformCreateCursor(_GLFWcursor* cursor, int width, int height, int cx, int cy,
int format, const void* data)
{
XcursorImage* cursorImage;
XcursorPixel* buffer;
unsigned char* image = (unsigned char*) data;
int i, size = width * height;
cursorImage = XcursorImageCreate(width, height);
if (cursorImage == NULL)
return GL_FALSE;
cursorImage->xhot = cx;
cursorImage->yhot = cy;
buffer = cursorImage->pixels;
for (i = 0; i < size; i++, buffer++, image += 4)
*buffer = (image[3] << 24) | (image[0] << 16) | (image[1] << 8) | image[2];
cursor->x11.handle = XcursorImageLoadCursor(_glfw.x11.display, cursorImage);
XcursorImageDestroy(cursorImage);
if (cursor->x11.handle == None)
return GL_FALSE;
return GL_TRUE;
}
void _glfwPlatformDestroyCursor(_GLFWcursor* cursor)
{
XFreeCursor(_glfw.x11.display, cursor->x11.handle);
}
void _glfwPlatformSetCursor(_GLFWwindow* window, _GLFWcursor* cursor)
{
if (window->cursorMode == GLFW_CURSOR_NORMAL)
{
if (cursor)
XDefineCursor(_glfw.x11.display, window->x11.handle, cursor->x11.handle);
else
XUndefineCursor(_glfw.x11.display, window->x11.handle);
XFlush(_glfw.x11.display);
}
}
//////////////////////////////////////////////////////////////////////////
////// GLFW native API //////

8
tests/CMakeLists.txt
View File

@ -32,6 +32,10 @@ add_executable(joysticks joysticks.c)
add_executable(modes modes.c ${GETOPT})
add_executable(peter peter.c)
add_executable(reopen reopen.c)
add_executable(cursor cursor.c)
add_executable(cursoranim WIN32 MACOSX_BUNDLE cursoranim.c)
set_target_properties(cursoranim PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Cursor animation")
add_executable(accuracy WIN32 MACOSX_BUNDLE accuracy.c)
set_target_properties(accuracy PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Accuracy")
@ -57,9 +61,9 @@ set_target_properties(windows PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Windows")
target_link_libraries(empty ${CMAKE_THREAD_LIBS_INIT} ${RT_LIBRARY})
target_link_libraries(threads ${CMAKE_THREAD_LIBS_INIT} ${RT_LIBRARY})
set(WINDOWS_BINARIES accuracy empty sharing tearing threads title windows)
set(WINDOWS_BINARIES accuracy empty sharing tearing threads title windows cursoranim)
set(CONSOLE_BINARIES clipboard defaults events fsaa gamma glfwinfo
iconify joysticks modes peter reopen)
iconify joysticks modes peter reopen cursor)
if (MSVC)
# Tell MSVC to use main instead of WinMain for Windows subsystem executables

283
tests/cursor.c Normal file
View File

@ -0,0 +1,283 @@
//========================================================================
// Cursor & input mode tests
// Copyright (c) Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
//
// System cursors and input modes tests.
//
//========================================================================
#define GLFW_INCLUDE_GLU
#include <GLFW/glfw3.h>
#include <stdio.h>
#include <stdlib.h>
static int W = 640;
static int H = 480;
static int delay = 0;
static GLFWwindow* windows[2] = {NULL, NULL};
static GLFWwindow* activeWindow = NULL;
static GLFWcursor* cursor = NULL;
static struct { int key; double time; } commands[] = {
{GLFW_KEY_H, 0},
{GLFW_KEY_C, 0},
{GLFW_KEY_D, 0},
{GLFW_KEY_S, 0},
{GLFW_KEY_N, 0},
{GLFW_KEY_1, 0},
{GLFW_KEY_2, 0},
{GLFW_KEY_3, 0}
};
static int CommandCount = sizeof(commands) / sizeof(commands[0]);
static struct { int w, h; } cursorSize[] = {
{24, 24}, {13, 37}, {5, 53}, {43, 64}, {300, 300}
};
static int SizeCount = sizeof(cursorSize) / sizeof(cursorSize[0]);
static int currentSize = 0;
static void command_callback(int key)
{
switch (key)
{
case GLFW_KEY_H:
{
printf("H: show this help\n");
printf("C: call glfwCreateCursor()\n");
printf("D: call glfwDestroyCursor()\n");
printf("S: call glfwSetCursor()\n");
printf("N: call glfwSetCursor() with NULL\n");
printf("1: set GLFW_CURSOR_NORMAL\n");
printf("2: set GLFW_CURSOR_HIDDEN\n");
printf("3: set GLFW_CURSOR_DISABLED\n");
printf("T: enable 3s delay for all previous commands\n");
}
break;
case GLFW_KEY_C:
{
if (cursor == NULL)
{
int w = cursorSize[currentSize].w;
int h = cursorSize[currentSize].h;
int x, y, i = 0;
unsigned char *image = malloc(4 * w * h);
for (y = 0; y < h; y++)
{
for (x = 0; x < w; x++)
{
image[i++] = 0xFF;
image[i++] = 0;
image[i++] = 255 * y / h;
image[i++] = 255 * x / w;
}
}
cursor = glfwCreateCursor(w, h, w / 2, h / 2, 0, image);
currentSize = (currentSize + 1) % SizeCount;
free(image);
}
}
break;
case GLFW_KEY_D:
{
if (cursor != NULL)
{
glfwDestroyCursor(cursor);
cursor = NULL;
}
}
break;
case GLFW_KEY_S:
{
if (cursor != NULL)
glfwSetCursor(activeWindow, cursor);
else
printf("The cursor is not created\n");
}
break;
case GLFW_KEY_N:
{
glfwSetCursor(activeWindow, NULL);
}
break;
case GLFW_KEY_1:
{
glfwSetInputMode(activeWindow, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
}
break;
case GLFW_KEY_2:
{
glfwSetInputMode(activeWindow, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
}
break;
case GLFW_KEY_3:
{
glfwSetInputMode(activeWindow, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
}
break;
}
}
static void error_callback(int error, const char* description)
{
fprintf(stderr, "Error: %s\n", description);
}
static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
W = width;
H = height;
glViewport(0, 0, W, H);
}
static void refresh_callback(GLFWwindow* window)
{
glfwMakeContextCurrent(window);
glClearColor(0.0f, window == activeWindow ? 0.8f : 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glfwSwapBuffers(window);
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (action != GLFW_PRESS)
return;
switch (key)
{
case GLFW_KEY_ESCAPE:
glfwSetWindowShouldClose(window, GL_TRUE);
break;
case GLFW_KEY_T:
delay = !delay;
printf("Delay %s.\n", delay ? "enabled" : "disabled");
break;
default:
{
if (delay)
{
int i = 0;
while (i < CommandCount && commands[i].key != key)
i++;
if (i < CommandCount)
commands[i].time = glfwGetTime();
}
else
{
command_callback(key);
}
}
break;
}
}
static void focus_callback(GLFWwindow* window, int focused)
{
if (focused)
{
activeWindow = window;
refresh_callback(windows[0]);
refresh_callback(windows[1]);
}
}
int main(void)
{
int i;
GLboolean running = GL_TRUE;
glfwSetErrorCallback(error_callback);
if (!glfwInit())
exit(EXIT_FAILURE);
for (i = 0; i < 2; i++)
{
windows[i] = glfwCreateWindow(W, H, "Cursor testing", NULL, NULL);
if (!windows[i])
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwSetWindowPos(windows[i], 100 + (i & 1) * (W + 50), 100);
glfwSetWindowRefreshCallback(windows[i], refresh_callback);
glfwSetFramebufferSizeCallback(windows[i], framebuffer_size_callback);
glfwSetKeyCallback(windows[i], key_callback);
glfwSetWindowFocusCallback(windows[i], focus_callback);
glfwMakeContextCurrent(windows[i]);
glClear(GL_COLOR_BUFFER_BIT);
glfwSwapBuffers(windows[i]);
}
activeWindow = windows[0];
key_callback(NULL, GLFW_KEY_H, 0, GLFW_PRESS, 0);
while (running)
{
if (delay)
{
int i;
double t = glfwGetTime();
for (i = 0; i < CommandCount; i++)
{
if (commands[i].time != 0 && t - commands[i].time >= 3.0)
{
command_callback(commands[i].key);
commands[i].time = 0;
}
}
}
running = !(glfwWindowShouldClose(windows[0]) || glfwWindowShouldClose(windows[1]));
glfwPollEvents();
}
glfwTerminate();
exit(EXIT_SUCCESS);
}

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//========================================================================
// Cursor animation
// Copyright (c) Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
//
// Cursor animation test.
//
//========================================================================
#include <GLFW/glfw3.h>
#include <stdlib.h>
#include <math.h>
#ifdef min
#undef min
#endif
#ifdef max
#undef max
#endif
#define SIZE 64 // cursor size (width & height)
#define N 60 // number of frames
unsigned char buffer[4 * SIZE * SIZE];
static float max(float a, float b) { return a > b ? a : b; }
static float min(float a, float b) { return a < b ? a : b; }
static float star(int x, int y, float t)
{
float c = SIZE / 2.0f;
float i = (0.25f * (float)sin(2.0f * 3.1415926f * t) + 0.75f);
float k = SIZE * 0.046875f * i;
float dist = (float)sqrt((x - c) * (x - c) + (y - c) * (y - c));
float salpha = 1.0f - dist / c;
float xalpha = (float)x == c ? c : k / (float)fabs(x - c);
float yalpha = (float)y == c ? c : k / (float)fabs(y - c);
return max(0.0f, min(1.0f, i * salpha * 0.2f + salpha * xalpha * yalpha));
}
static GLFWcursor* load_frame(float t)
{
int i = 0, x, y;
for (y = 0; y < SIZE; y++)
{
for (x = 0; x < SIZE; x++)
{
buffer[i++] = 255;
buffer[i++] = 255;
buffer[i++] = 255;
buffer[i++] = (unsigned char)(255 * star(x, y, t));
}
}
return glfwCreateCursor(SIZE, SIZE, SIZE / 2, SIZE / 2, 0, buffer);
}
int main(void)
{
int i;
double t0, t1, frameTime = 0.0;
GLFWwindow* window;
GLFWcursor* frames[N];
if (!glfwInit())
exit(EXIT_FAILURE);
window = glfwCreateWindow(640, 480, "Cursor animation", NULL, NULL);
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window);
glfwSwapInterval(1);
for (i = 0; i < N; i++)
frames[i] = load_frame(i / (float)N);
i = 0;
t0 = glfwGetTime();
while (!glfwWindowShouldClose(window))
{
glClear(GL_COLOR_BUFFER_BIT);
glfwSetCursor(window, frames[i]);
glfwSwapBuffers(window);
glfwPollEvents();
t1 = glfwGetTime();
frameTime += t1 - t0;
t0 = t1;
while (frameTime > 1.0 / (double)N)
{
i = (i + 1) % N;
frameTime -= 1.0 / (double)N;
}
}
glfwTerminate();
exit(EXIT_SUCCESS);
}