mirror of
https://github.com/glfw/glfw.git
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363 lines
9.9 KiB
C
363 lines
9.9 KiB
C
//========================================================================
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// GLFW - An OpenGL framework
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// Platform: Any
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// API version: 3.0
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// WWW: http://www.glfw.org/
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//------------------------------------------------------------------------
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// Copyright (c) 2002-2006 Marcus Geelnard
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// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//========================================================================
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#include "internal.h"
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#include <string.h>
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#include <stdlib.h>
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#include <limits.h>
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#if defined(_MSC_VER)
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#include <malloc.h>
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#define strdup _strdup
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#endif
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// Lexical comparison function for GLFW video modes, used by qsort
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//
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static int compareVideoModes(const void* firstPtr, const void* secondPtr)
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{
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int firstBPP, secondBPP, firstSize, secondSize;
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GLFWvidmode* first = (GLFWvidmode*) firstPtr;
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GLFWvidmode* second = (GLFWvidmode*) secondPtr;
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// First sort on color bits per pixel
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firstBPP = first->redBits +
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first->greenBits +
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first->blueBits;
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secondBPP = second->redBits +
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second->greenBits +
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second->blueBits;
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if (firstBPP != secondBPP)
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return firstBPP - secondBPP;
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// Then sort on screen area, in pixels
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firstSize = first->width * first->height;
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secondSize = second->width * second->height;
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if (firstSize != secondSize)
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return firstSize - secondSize;
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// Lastly sort on refresh rate
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return first->refreshRate - second->refreshRate;
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}
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// Retrieves the available modes for the specified monitor
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//
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static int refreshVideoModes(_GLFWmonitor* monitor)
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{
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int modeCount;
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GLFWvidmode* modes = _glfwPlatformGetVideoModes(monitor, &modeCount);
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if (!modes)
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return GL_FALSE;
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qsort(modes, modeCount, sizeof(GLFWvidmode), compareVideoModes);
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free(monitor->modes);
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monitor->modes = modes;
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monitor->modeCount = modeCount;
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return GL_TRUE;
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW event API //////
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//////////////////////////////////////////////////////////////////////////
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void _glfwInputMonitorChange(void)
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{
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int i, j, monitorCount = _glfw.monitorCount;
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_GLFWmonitor** monitors = _glfw.monitors;
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_glfw.monitors = _glfwPlatformGetMonitors(&_glfw.monitorCount);
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// Re-use still connected monitor objects
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for (i = 0; i < _glfw.monitorCount; i++)
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{
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for (j = 0; j < monitorCount; j++)
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{
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if (_glfwPlatformIsSameMonitor(_glfw.monitors[i], monitors[j]))
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{
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_glfwDestroyMonitor(_glfw.monitors[i]);
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_glfw.monitors[i] = monitors[j];
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break;
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}
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}
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}
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// Find and report disconnected monitors (not in the new list)
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for (i = 0; i < monitorCount; i++)
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{
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_GLFWwindow* window;
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for (j = 0; j < _glfw.monitorCount; j++)
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{
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if (monitors[i] == _glfw.monitors[j])
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break;
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}
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if (j < _glfw.monitorCount)
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continue;
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for (window = _glfw.windowListHead; window; window = window->next)
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{
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if (window->monitor == monitors[i])
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window->monitor = NULL;
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}
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if (_glfw.monitorCallback)
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_glfw.monitorCallback((GLFWmonitor*) monitors[i], GLFW_DISCONNECTED);
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}
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// Find and report newly connected monitors (not in the old list)
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// Re-used monitor objects are then removed from the old list to avoid
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// having them destroyed at the end of this function
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for (i = 0; i < _glfw.monitorCount; i++)
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{
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for (j = 0; j < monitorCount; j++)
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{
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if (_glfw.monitors[i] == monitors[j])
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{
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monitors[j] = NULL;
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break;
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}
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}
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if (j < monitorCount)
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continue;
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if (_glfw.monitorCallback)
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_glfw.monitorCallback((GLFWmonitor*) _glfw.monitors[i], GLFW_CONNECTED);
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}
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_glfwDestroyMonitors(monitors, monitorCount);
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW internal API //////
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//////////////////////////////////////////////////////////////////////////
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_GLFWmonitor* _glfwCreateMonitor(const char* name, int widthMM, int heightMM)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) calloc(1, sizeof(_GLFWmonitor));
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monitor->name = strdup(name);
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monitor->widthMM = widthMM;
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monitor->heightMM = heightMM;
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return monitor;
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}
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void _glfwDestroyMonitor(_GLFWmonitor* monitor)
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{
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if (monitor == NULL)
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return;
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_glfwFreeGammaRamp(&monitor->originalRamp);
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_glfwFreeGammaRamp(&monitor->currentRamp);
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free(monitor->modes);
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free(monitor->name);
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free(monitor);
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}
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void _glfwDestroyMonitors(_GLFWmonitor** monitors, int count)
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{
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int i;
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for (i = 0; i < count; i++)
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_glfwDestroyMonitor(monitors[i]);
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free(monitors);
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}
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const GLFWvidmode* _glfwChooseVideoMode(_GLFWmonitor* monitor,
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const GLFWvidmode* desired)
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{
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int i;
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unsigned int sizeDiff, leastSizeDiff = UINT_MAX;
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unsigned int rateDiff, leastRateDiff = UINT_MAX;
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unsigned int colorDiff, leastColorDiff = UINT_MAX;
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const GLFWvidmode* current;
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const GLFWvidmode* closest = NULL;
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if (!refreshVideoModes(monitor))
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return NULL;
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for (i = 0; i < monitor->modeCount; i++)
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{
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current = monitor->modes + i;
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colorDiff = abs((current->redBits + current->greenBits + current->blueBits) -
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(desired->redBits + desired->greenBits + desired->blueBits));
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sizeDiff = abs((current->width - desired->width) *
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(current->width - desired->width) +
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(current->height - desired->height) *
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(current->height - desired->height));
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if (desired->refreshRate)
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rateDiff = abs(current->refreshRate - desired->refreshRate);
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else
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rateDiff = UINT_MAX - current->refreshRate;
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if ((colorDiff < leastColorDiff) ||
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(colorDiff == leastColorDiff && sizeDiff < leastSizeDiff) ||
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(colorDiff == leastColorDiff && sizeDiff == leastSizeDiff && rateDiff < leastRateDiff))
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{
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closest = current;
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leastSizeDiff = sizeDiff;
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leastRateDiff = rateDiff;
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leastColorDiff = colorDiff;
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}
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}
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return closest;
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}
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int _glfwCompareVideoModes(const GLFWvidmode* first, const GLFWvidmode* second)
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{
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return compareVideoModes(first, second);
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}
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void _glfwSplitBPP(int bpp, int* red, int* green, int* blue)
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{
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int delta;
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// We assume that by 32 the user really meant 24
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if (bpp == 32)
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bpp = 24;
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// Convert "bits per pixel" to red, green & blue sizes
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*red = *green = *blue = bpp / 3;
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delta = bpp - (*red * 3);
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if (delta >= 1)
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*green = *green + 1;
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if (delta == 2)
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*red = *red + 1;
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW public API //////
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//////////////////////////////////////////////////////////////////////////
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GLFWAPI GLFWmonitor** glfwGetMonitors(int* count)
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{
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*count = 0;
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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*count = _glfw.monitorCount;
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return (GLFWmonitor**) _glfw.monitors;
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}
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GLFWAPI GLFWmonitor* glfwGetPrimaryMonitor(void)
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{
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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return (GLFWmonitor*) _glfw.monitors[0];
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}
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GLFWAPI void glfwGetMonitorPos(GLFWmonitor* handle, int* xpos, int* ypos)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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_GLFW_REQUIRE_INIT();
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_glfwPlatformGetMonitorPos(monitor, xpos, ypos);
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}
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GLFWAPI void glfwGetMonitorPhysicalSize(GLFWmonitor* handle, int* width, int* height)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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_GLFW_REQUIRE_INIT();
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if (width)
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*width = monitor->widthMM;
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if (height)
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*height = monitor->heightMM;
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}
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GLFWAPI const char* glfwGetMonitorName(GLFWmonitor* handle)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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return monitor->name;
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}
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GLFWAPI GLFWmonitorfun glfwSetMonitorCallback(GLFWmonitorfun cbfun)
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{
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GLFWmonitorfun previous;
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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previous = _glfw.monitorCallback;
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_glfw.monitorCallback = cbfun;
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return previous;
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}
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GLFWAPI const GLFWvidmode* glfwGetVideoModes(GLFWmonitor* handle, int* count)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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*count = 0;
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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if (monitor->modes == NULL)
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{
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if (!refreshVideoModes(monitor))
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return GL_FALSE;
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}
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*count = monitor->modeCount;
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return monitor->modes;
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}
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GLFWAPI const GLFWvidmode* glfwGetVideoMode(GLFWmonitor* handle)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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_glfwPlatformGetVideoMode(monitor, &monitor->currentMode);
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return &monitor->currentMode;
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}
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