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monitor.c
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//========================================================================
// GLFW 3.0 - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 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.
//
//========================================================================
#include "internal.h"
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#if defined(_MSC_VER)
#include <malloc.h>
#define strdup _strdup
#endif
// Lexical comparison function for GLFW video modes, used by qsort
//
static int compareVideoModes(const void* firstPtr, const void* secondPtr)
{
int firstBPP, secondBPP, firstSize, secondSize;
GLFWvidmode* first = (GLFWvidmode*) firstPtr;
GLFWvidmode* second = (GLFWvidmode*) secondPtr;
// First sort on color bits per pixel
firstBPP = first->redBits +
first->greenBits +
first->blueBits;
secondBPP = second->redBits +
second->greenBits +
second->blueBits;
if (firstBPP != secondBPP)
return firstBPP - secondBPP;
// Then sort on screen area, in pixels
firstSize = first->width * first->height;
secondSize = second->width * second->height;
if (firstSize != secondSize)
return firstSize - secondSize;
// Lastly sort on refresh rate
return first->refreshRate - second->refreshRate;
}
// Retrieves the available modes for the specified monitor
//
static int refreshVideoModes(_GLFWmonitor* monitor)
{
int modeCount;
GLFWvidmode* modes;
if (monitor->modes)
return GL_TRUE;
modes = _glfwPlatformGetVideoModes(monitor, &modeCount);
if (!modes)
return GL_FALSE;
qsort(modes, modeCount, sizeof(GLFWvidmode), compareVideoModes);
free(monitor->modes);
monitor->modes = modes;
monitor->modeCount = modeCount;
return GL_TRUE;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW event API //////
//////////////////////////////////////////////////////////////////////////
void _glfwInputMonitorChange(void)
{
int i, j, monitorCount = _glfw.monitorCount;
_GLFWmonitor** monitors = _glfw.monitors;
_glfw.monitors = _glfwPlatformGetMonitors(&_glfw.monitorCount);
// Re-use still connected monitor objects
for (i = 0; i < _glfw.monitorCount; i++)
{
for (j = 0; j < monitorCount; j++)
{
if (_glfwPlatformIsSameMonitor(_glfw.monitors[i], monitors[j]))
{
_glfwDestroyMonitor(_glfw.monitors[i]);
_glfw.monitors[i] = monitors[j];
break;
}
}
}
// Find and report disconnected monitors (not in the new list)
for (i = 0; i < monitorCount; i++)
{
_GLFWwindow* window;
for (j = 0; j < _glfw.monitorCount; j++)
{
if (monitors[i] == _glfw.monitors[j])
break;
}
if (j < _glfw.monitorCount)
continue;
for (window = _glfw.windowListHead; window; window = window->next)
{
if (window->monitor == monitors[i])
window->monitor = NULL;
}
if (_glfw.callbacks.monitor)
_glfw.callbacks.monitor((GLFWmonitor*) monitors[i], GLFW_DISCONNECTED);
}
// Find and report newly connected monitors (not in the old list)
// Re-used monitor objects are then removed from the old list to avoid
// having them destroyed at the end of this function
for (i = 0; i < _glfw.monitorCount; i++)
{
for (j = 0; j < monitorCount; j++)
{
if (_glfw.monitors[i] == monitors[j])
{
monitors[j] = NULL;
break;
}
}
if (j < monitorCount)
continue;
if (_glfw.callbacks.monitor)
_glfw.callbacks.monitor((GLFWmonitor*) _glfw.monitors[i], GLFW_CONNECTED);
}
_glfwDestroyMonitors(monitors, monitorCount);
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
_GLFWmonitor* _glfwCreateMonitor(const char* name, int widthMM, int heightMM)
{
_GLFWmonitor* monitor = calloc(1, sizeof(_GLFWmonitor));
monitor->name = strdup(name);
monitor->widthMM = widthMM;
monitor->heightMM = heightMM;
return monitor;
}
void _glfwDestroyMonitor(_GLFWmonitor* monitor)
{
if (monitor == NULL)
return;
_glfwFreeGammaArrays(&monitor->originalRamp);
_glfwFreeGammaArrays(&monitor->currentRamp);
free(monitor->modes);
free(monitor->name);
free(monitor);
}
void _glfwDestroyMonitors(_GLFWmonitor** monitors, int count)
{
int i;
for (i = 0; i < count; i++)
_glfwDestroyMonitor(monitors[i]);
free(monitors);
}
const GLFWvidmode* _glfwChooseVideoMode(_GLFWmonitor* monitor,
const GLFWvidmode* desired)
{
int i;
unsigned int sizeDiff, leastSizeDiff = UINT_MAX;
unsigned int rateDiff, leastRateDiff = UINT_MAX;
unsigned int colorDiff, leastColorDiff = UINT_MAX;
const GLFWvidmode* current;
const GLFWvidmode* closest = NULL;
if (!refreshVideoModes(monitor))
return NULL;
for (i = 0; i < monitor->modeCount; i++)
{
current = monitor->modes + i;
colorDiff = abs((current->redBits + current->greenBits + current->blueBits) -
(desired->redBits + desired->greenBits + desired->blueBits));
sizeDiff = abs((current->width - desired->width) *
(current->width - desired->width) +
(current->height - desired->height) *
(current->height - desired->height));
if (desired->refreshRate)
rateDiff = abs(current->refreshRate - desired->refreshRate);
else
rateDiff = UINT_MAX - current->refreshRate;
if ((colorDiff < leastColorDiff) ||
(colorDiff == leastColorDiff && sizeDiff < leastSizeDiff) ||
(colorDiff == leastColorDiff && sizeDiff == leastSizeDiff && rateDiff < leastRateDiff))
{
closest = current;
leastSizeDiff = sizeDiff;
leastRateDiff = rateDiff;
leastColorDiff = colorDiff;
}
}
return closest;
}
int _glfwCompareVideoModes(const GLFWvidmode* first, const GLFWvidmode* second)
{
return compareVideoModes(first, second);
}
void _glfwSplitBPP(int bpp, int* red, int* green, int* blue)
{
int delta;
// We assume that by 32 the user really meant 24
if (bpp == 32)
bpp = 24;
// Convert "bits per pixel" to red, green & blue sizes
*red = *green = *blue = bpp / 3;
delta = bpp - (*red * 3);
if (delta >= 1)
*green = *green + 1;
if (delta == 2)
*red = *red + 1;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW public API //////
//////////////////////////////////////////////////////////////////////////
GLFWAPI GLFWmonitor** glfwGetMonitors(int* count)
{
*count = 0;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
*count = _glfw.monitorCount;
return (GLFWmonitor**) _glfw.monitors;
}
GLFWAPI GLFWmonitor* glfwGetPrimaryMonitor(void)
{
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
return (GLFWmonitor*) _glfw.monitors[0];
}
GLFWAPI void glfwGetMonitorPos(GLFWmonitor* handle, int* xpos, int* ypos)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
_GLFW_REQUIRE_INIT();
_glfwPlatformGetMonitorPos(monitor, xpos, ypos);
}
GLFWAPI void glfwGetMonitorPhysicalSize(GLFWmonitor* handle, int* width, int* height)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
_GLFW_REQUIRE_INIT();
if (width)
*width = monitor->widthMM;
if (height)
*height = monitor->heightMM;
}
GLFWAPI const char* glfwGetMonitorName(GLFWmonitor* handle)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
return monitor->name;
}
GLFWAPI GLFWmonitorfun glfwSetMonitorCallback(GLFWmonitorfun cbfun)
{
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
_GLFW_SWAP_POINTERS(_glfw.callbacks.monitor, cbfun);
return cbfun;
}
GLFWAPI const GLFWvidmode* glfwGetVideoModes(GLFWmonitor* handle, int* count)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
*count = 0;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
if (!refreshVideoModes(monitor))
return NULL;
*count = monitor->modeCount;
return monitor->modes;
}
GLFWAPI const GLFWvidmode* glfwGetVideoMode(GLFWmonitor* handle)
{
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
_glfwPlatformGetVideoMode(monitor, &monitor->currentMode);
return &monitor->currentMode;
}

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