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cpputils / deps / glfw / src / monitor.c
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1//========================================================================
2// GLFW 3.3 - www.glfw.org
3//------------------------------------------------------------------------
4// Copyright (c) 2002-2006 Marcus Geelnard
5// Copyright (c) 2006-2019 Camilla Löwy <elmindreda@glfw.org>
6//
7// This software is provided 'as-is', without any express or implied
8// warranty. In no event will the authors be held liable for any damages
9// arising from the use of this software.
10//
11// Permission is granted to anyone to use this software for any purpose,
12// including commercial applications, and to alter it and redistribute it
13// freely, subject to the following restrictions:
14//
15// 1. The origin of this software must not be misrepresented; you must not
16// claim that you wrote the original software. If you use this software
17// in a product, an acknowledgment in the product documentation would
18// be appreciated but is not required.
19//
20// 2. Altered source versions must be plainly marked as such, and must not
21// be misrepresented as being the original software.
22//
23// 3. This notice may not be removed or altered from any source
24// distribution.
25//
26//========================================================================
27// Please use C89 style variable declarations in this file because VS 2010
28//========================================================================
29
30#include "internal.h"
31
32#include <assert.h>
33#include <math.h>
34#include <float.h>
35#include <string.h>
36#include <stdlib.h>
37#include <limits.h>
38
39
40// Lexically compare video modes, used by qsort
41//
42static int compareVideoModes(const void* fp, const void* sp)
43{
44 const GLFWvidmode* fm = fp;
45 const GLFWvidmode* sm = sp;
46 const int fbpp = fm->redBits + fm->greenBits + fm->blueBits;
47 const int sbpp = sm->redBits + sm->greenBits + sm->blueBits;
48 const int farea = fm->width * fm->height;
49 const int sarea = sm->width * sm->height;
50
51 // First sort on color bits per pixel
52 if (fbpp != sbpp)
53 return fbpp - sbpp;
54
55 // Then sort on screen area
56 if (farea != sarea)
57 return farea - sarea;
58
59 // Then sort on width
60 if (fm->width != sm->width)
61 return fm->width - sm->width;
62
63 // Lastly sort on refresh rate
64 return fm->refreshRate - sm->refreshRate;
65}
66
67// Retrieves the available modes for the specified monitor
68//
69static GLFWbool refreshVideoModes(_GLFWmonitor* monitor)
70{
71 int modeCount;
72 GLFWvidmode* modes;
73
74 if (monitor->modes)
75 return GLFW_TRUE;
76
77 modes = _glfwPlatformGetVideoModes(monitor, &modeCount);
78 if (!modes)
79 return GLFW_FALSE;
80
81 qsort(modes, modeCount, sizeof(GLFWvidmode), compareVideoModes);
82
83 free(monitor->modes);
84 monitor->modes = modes;
85 monitor->modeCount = modeCount;
86
87 return GLFW_TRUE;
88}
89
90
91//////////////////////////////////////////////////////////////////////////
92////// GLFW event API //////
93//////////////////////////////////////////////////////////////////////////
94
95// Notifies shared code of a monitor connection or disconnection
96//
97void _glfwInputMonitor(_GLFWmonitor* monitor, int action, int placement)
98{
99 if (action == GLFW_CONNECTED)
100 {
101 _glfw.monitorCount++;
102 _glfw.monitors =
103 realloc(_glfw.monitors, sizeof(_GLFWmonitor*) * _glfw.monitorCount);
104
105 if (placement == _GLFW_INSERT_FIRST)
106 {
107 memmove(_glfw.monitors + 1,
108 _glfw.monitors,
109 ((size_t) _glfw.monitorCount - 1) * sizeof(_GLFWmonitor*));
110 _glfw.monitors[0] = monitor;
111 }
112 else
113 _glfw.monitors[_glfw.monitorCount - 1] = monitor;
114 }
115 else if (action == GLFW_DISCONNECTED)
116 {
117 int i;
118 _GLFWwindow* window;
119
120 for (window = _glfw.windowListHead; window; window = window->next)
121 {
122 if (window->monitor == monitor)
123 {
124 int width, height, xoff, yoff;
125 _glfwPlatformGetWindowSize(window, &width, &height);
126 _glfwPlatformSetWindowMonitor(window, NULL, 0, 0, width, height, 0);
127 _glfwPlatformGetWindowFrameSize(window, &xoff, &yoff, NULL, NULL);
128 _glfwPlatformSetWindowPos(window, xoff, yoff);
129 }
130 }
131
132 for (i = 0; i < _glfw.monitorCount; i++)
133 {
134 if (_glfw.monitors[i] == monitor)
135 {
136 _glfw.monitorCount--;
137 memmove(_glfw.monitors + i,
138 _glfw.monitors + i + 1,
139 ((size_t) _glfw.monitorCount - i) * sizeof(_GLFWmonitor*));
140 break;
141 }
142 }
143 }
144
145 if (_glfw.callbacks.monitor)
146 _glfw.callbacks.monitor((GLFWmonitor*) monitor, action);
147
148 if (action == GLFW_DISCONNECTED)
149 _glfwFreeMonitor(monitor);
150}
151
152// Notifies shared code that a full screen window has acquired or released
153// a monitor
154//
155void _glfwInputMonitorWindow(_GLFWmonitor* monitor, _GLFWwindow* window)
156{
157 monitor->window = window;
158}
159
160
161//////////////////////////////////////////////////////////////////////////
162////// GLFW internal API //////
163//////////////////////////////////////////////////////////////////////////
164
165// Allocates and returns a monitor object with the specified name and dimensions
166//
167_GLFWmonitor* _glfwAllocMonitor(const char* name, int widthMM, int heightMM)
168{
169 _GLFWmonitor* monitor = calloc(1, sizeof(_GLFWmonitor));
170 monitor->widthMM = widthMM;
171 monitor->heightMM = heightMM;
172
173 if (name)
174 monitor->name = _glfw_strdup(name);
175
176 return monitor;
177}
178
179// Frees a monitor object and any data associated with it
180//
181void _glfwFreeMonitor(_GLFWmonitor* monitor)
182{
183 if (monitor == NULL)
184 return;
185
186 _glfwPlatformFreeMonitor(monitor);
187
188 _glfwFreeGammaArrays(&monitor->originalRamp);
189 _glfwFreeGammaArrays(&monitor->currentRamp);
190
191 free(monitor->modes);
192 free(monitor->name);
193 free(monitor);
194}
195
196// Allocates red, green and blue value arrays of the specified size
197//
198void _glfwAllocGammaArrays(GLFWgammaramp* ramp, unsigned int size)
199{
200 ramp->red = calloc(size, sizeof(unsigned short));
201 ramp->green = calloc(size, sizeof(unsigned short));
202 ramp->blue = calloc(size, sizeof(unsigned short));
203 ramp->size = size;
204}
205
206// Frees the red, green and blue value arrays and clears the struct
207//
208void _glfwFreeGammaArrays(GLFWgammaramp* ramp)
209{
210 free(ramp->red);
211 free(ramp->green);
212 free(ramp->blue);
213
214 memset(ramp, 0, sizeof(GLFWgammaramp));
215}
216
217// Chooses the video mode most closely matching the desired one
218//
219const GLFWvidmode* _glfwChooseVideoMode(_GLFWmonitor* monitor,
220 const GLFWvidmode* desired)
221{
222 int i;
223 unsigned int sizeDiff, leastSizeDiff = UINT_MAX;
224 unsigned int rateDiff, leastRateDiff = UINT_MAX;
225 unsigned int colorDiff, leastColorDiff = UINT_MAX;
226 const GLFWvidmode* current;
227 const GLFWvidmode* closest = NULL;
228
229 if (!refreshVideoModes(monitor))
230 return NULL;
231
232 for (i = 0; i < monitor->modeCount; i++)
233 {
234 current = monitor->modes + i;
235
236 colorDiff = 0;
237
238 if (desired->redBits != GLFW_DONT_CARE)
239 colorDiff += abs(current->redBits - desired->redBits);
240 if (desired->greenBits != GLFW_DONT_CARE)
241 colorDiff += abs(current->greenBits - desired->greenBits);
242 if (desired->blueBits != GLFW_DONT_CARE)
243 colorDiff += abs(current->blueBits - desired->blueBits);
244
245 sizeDiff = abs((current->width - desired->width) *
246 (current->width - desired->width) +
247 (current->height - desired->height) *
248 (current->height - desired->height));
249
250 if (desired->refreshRate != GLFW_DONT_CARE)
251 rateDiff = abs(current->refreshRate - desired->refreshRate);
252 else
253 rateDiff = UINT_MAX - current->refreshRate;
254
255 if ((colorDiff < leastColorDiff) ||
256 (colorDiff == leastColorDiff && sizeDiff < leastSizeDiff) ||
257 (colorDiff == leastColorDiff && sizeDiff == leastSizeDiff && rateDiff < leastRateDiff))
258 {
259 closest = current;
260 leastSizeDiff = sizeDiff;
261 leastRateDiff = rateDiff;
262 leastColorDiff = colorDiff;
263 }
264 }
265
266 return closest;
267}
268
269// Performs lexical comparison between two @ref GLFWvidmode structures
270//
271int _glfwCompareVideoModes(const GLFWvidmode* fm, const GLFWvidmode* sm)
272{
273 return compareVideoModes(fm, sm);
274}
275
276// Splits a color depth into red, green and blue bit depths
277//
278void _glfwSplitBPP(int bpp, int* red, int* green, int* blue)
279{
280 int delta;
281
282 // We assume that by 32 the user really meant 24
283 if (bpp == 32)
284 bpp = 24;
285
286 // Convert "bits per pixel" to red, green & blue sizes
287
288 *red = *green = *blue = bpp / 3;
289 delta = bpp - (*red * 3);
290 if (delta >= 1)
291 *green = *green + 1;
292
293 if (delta == 2)
294 *red = *red + 1;
295}
296
297
298//////////////////////////////////////////////////////////////////////////
299////// GLFW public API //////
300//////////////////////////////////////////////////////////////////////////
301
302GLFWAPI GLFWmonitor** glfwGetMonitors(int* count)
303{
304 assert(count != NULL);
305
306 *count = 0;
307
308 _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
309
310 *count = _glfw.monitorCount;
311 return (GLFWmonitor**) _glfw.monitors;
312}
313
314GLFWAPI GLFWmonitor* glfwGetPrimaryMonitor(void)
315{
316 _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
317
318 if (!_glfw.monitorCount)
319 return NULL;
320
321 return (GLFWmonitor*) _glfw.monitors[0];
322}
323
324GLFWAPI void glfwGetMonitorPos(GLFWmonitor* handle, int* xpos, int* ypos)
325{
326 _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
327 assert(monitor != NULL);
328
329 if (xpos)
330 *xpos = 0;
331 if (ypos)
332 *ypos = 0;
333
334 _GLFW_REQUIRE_INIT();
335
336 _glfwPlatformGetMonitorPos(monitor, xpos, ypos);
337}
338
339GLFWAPI void glfwGetMonitorWorkarea(GLFWmonitor* handle,
340 int* xpos, int* ypos,
341 int* width, int* height)
342{
343 _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
344 assert(monitor != NULL);
345
346 if (xpos)
347 *xpos = 0;
348 if (ypos)
349 *ypos = 0;
350 if (width)
351 *width = 0;
352 if (height)
353 *height = 0;
354
355 _GLFW_REQUIRE_INIT();
356
357 _glfwPlatformGetMonitorWorkarea(monitor, xpos, ypos, width, height);
358}
359
360GLFWAPI void glfwGetMonitorPhysicalSize(GLFWmonitor* handle, int* widthMM, int* heightMM)
361{
362 _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
363 assert(monitor != NULL);
364
365 if (widthMM)
366 *widthMM = 0;
367 if (heightMM)
368 *heightMM = 0;
369
370 _GLFW_REQUIRE_INIT();
371
372 if (widthMM)
373 *widthMM = monitor->widthMM;
374 if (heightMM)
375 *heightMM = monitor->heightMM;
376}
377
378GLFWAPI void glfwGetMonitorContentScale(GLFWmonitor* handle,
379 float* xscale, float* yscale)
380{
381 _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
382 assert(monitor != NULL);
383
384 if (xscale)
385 *xscale = 0.f;
386 if (yscale)
387 *yscale = 0.f;
388
389 _GLFW_REQUIRE_INIT();
390 _glfwPlatformGetMonitorContentScale(monitor, xscale, yscale);
391}
392
393GLFWAPI const char* glfwGetMonitorName(GLFWmonitor* handle)
394{
395 _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
396 assert(monitor != NULL);
397
398 _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
399 return monitor->name;
400}
401
402GLFWAPI void glfwSetMonitorUserPointer(GLFWmonitor* handle, void* pointer)
403{
404 _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
405 assert(monitor != NULL);
406
407 _GLFW_REQUIRE_INIT();
408 monitor->userPointer = pointer;
409}
410
411GLFWAPI void* glfwGetMonitorUserPointer(GLFWmonitor* handle)
412{
413 _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
414 assert(monitor != NULL);
415
416 _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
417 return monitor->userPointer;
418}
419
420GLFWAPI GLFWmonitorfun glfwSetMonitorCallback(GLFWmonitorfun cbfun)
421{
422 _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
423 _GLFW_SWAP_POINTERS(_glfw.callbacks.monitor, cbfun);
424 return cbfun;
425}
426
427GLFWAPI const GLFWvidmode* glfwGetVideoModes(GLFWmonitor* handle, int* count)
428{
429 _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
430 assert(monitor != NULL);
431 assert(count != NULL);
432
433 *count = 0;
434
435 _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
436
437 if (!refreshVideoModes(monitor))
438 return NULL;
439
440 *count = monitor->modeCount;
441 return monitor->modes;
442}
443
444GLFWAPI const GLFWvidmode* glfwGetVideoMode(GLFWmonitor* handle)
445{
446 _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
447 assert(monitor != NULL);
448
449 _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
450
451 _glfwPlatformGetVideoMode(monitor, &monitor->currentMode);
452 return &monitor->currentMode;
453}
454
455GLFWAPI void glfwSetGamma(GLFWmonitor* handle, float gamma)
456{
457 unsigned int i;
458 unsigned short* values;
459 GLFWgammaramp ramp;
460 const GLFWgammaramp* original;
461 assert(handle != NULL);
462 assert(gamma > 0.f);
463 assert(gamma <= FLT_MAX);
464
465 _GLFW_REQUIRE_INIT();
466
467 if (gamma != gamma || gamma <= 0.f || gamma > FLT_MAX)
468 {
469 _glfwInputError(GLFW_INVALID_VALUE, "Invalid gamma value %f", gamma);
470 return;
471 }
472
473 original = glfwGetGammaRamp(handle);
474 if (!original)
475 return;
476
477 values = calloc(original->size, sizeof(unsigned short));
478
479 for (i = 0; i < original->size; i++)
480 {
481 float value;
482
483 // Calculate intensity
484 value = i / (float) (original->size - 1);
485 // Apply gamma curve
486 value = powf(value, 1.f / gamma) * 65535.f + 0.5f;
487 // Clamp to value range
488 value = _glfw_fminf(value, 65535.f);
489
490 values[i] = (unsigned short) value;
491 }
492
493 ramp.red = values;
494 ramp.green = values;
495 ramp.blue = values;
496 ramp.size = original->size;
497
498 glfwSetGammaRamp(handle, &ramp);
499 free(values);
500}
501
502GLFWAPI const GLFWgammaramp* glfwGetGammaRamp(GLFWmonitor* handle)
503{
504 _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
505 assert(monitor != NULL);
506
507 _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
508
509 _glfwFreeGammaArrays(&monitor->currentRamp);
510 if (!_glfwPlatformGetGammaRamp(monitor, &monitor->currentRamp))
511 return NULL;
512
513 return &monitor->currentRamp;
514}
515
516GLFWAPI void glfwSetGammaRamp(GLFWmonitor* handle, const GLFWgammaramp* ramp)
517{
518 _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
519 assert(monitor != NULL);
520 assert(ramp != NULL);
521 assert(ramp->size > 0);
522 assert(ramp->red != NULL);
523 assert(ramp->green != NULL);
524 assert(ramp->blue != NULL);
525
526 if (ramp->size <= 0)
527 {
528 _glfwInputError(GLFW_INVALID_VALUE,
529 "Invalid gamma ramp size %i",
530 ramp->size);
531 return;
532 }
533
534 _GLFW_REQUIRE_INIT();
535
536 if (!monitor->originalRamp.size)
537 {
538 if (!_glfwPlatformGetGammaRamp(monitor, &monitor->originalRamp))
539 return;
540 }
541
542 _glfwPlatformSetGammaRamp(monitor, ramp);
543}
544