545 lines
15 KiB
C
545 lines
15 KiB
C
//========================================================================
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// GLFW 3.4 - www.glfw.org
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//------------------------------------------------------------------------
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// Copyright (c) 2002-2006 Marcus Geelnard
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// Copyright (c) 2006-2019 Camilla Löwy <elmindreda@glfw.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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// Please use C89 style variable declarations in this file because VS 2010
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//========================================================================
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#include "internal.h"
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#include <assert.h>
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#include <math.h>
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#include <float.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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// Lexically compare video modes, used by qsort
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//
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static int compareVideoModes(const void* fp, const void* sp)
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{
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const GLFWvidmode* fm = fp;
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const GLFWvidmode* sm = sp;
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const int fbpp = fm->redBits + fm->greenBits + fm->blueBits;
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const int sbpp = sm->redBits + sm->greenBits + sm->blueBits;
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const int farea = fm->width * fm->height;
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const int sarea = sm->width * sm->height;
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// First sort on color bits per pixel
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if (fbpp != sbpp)
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return fbpp - sbpp;
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// Then sort on screen area
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if (farea != sarea)
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return farea - sarea;
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// Then sort on width
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if (fm->width != sm->width)
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return fm->width - sm->width;
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// Lastly sort on refresh rate
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return fm->refreshRate - sm->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 GLFWbool refreshVideoModes(_GLFWmonitor* monitor)
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{
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int modeCount;
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GLFWvidmode* modes;
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if (monitor->modes)
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return GLFW_TRUE;
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modes = _glfwPlatformGetVideoModes(monitor, &modeCount);
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if (!modes)
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return GLFW_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 GLFW_TRUE;
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW event API //////
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//////////////////////////////////////////////////////////////////////////
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// Notifies shared code of a monitor connection or disconnection
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//
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void _glfwInputMonitor(_GLFWmonitor* monitor, int action, int placement)
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{
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if (action == GLFW_CONNECTED)
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{
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_glfw.monitorCount++;
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_glfw.monitors =
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realloc(_glfw.monitors, sizeof(_GLFWmonitor*) * _glfw.monitorCount);
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if (placement == _GLFW_INSERT_FIRST)
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{
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memmove(_glfw.monitors + 1,
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_glfw.monitors,
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((size_t) _glfw.monitorCount - 1) * sizeof(_GLFWmonitor*));
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_glfw.monitors[0] = monitor;
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}
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else
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_glfw.monitors[_glfw.monitorCount - 1] = monitor;
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}
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else if (action == GLFW_DISCONNECTED)
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{
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int i;
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_GLFWwindow* window;
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for (window = _glfw.windowListHead; window; window = window->next)
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{
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if (window->monitor == monitor)
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{
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int width, height, xoff, yoff;
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_glfwPlatformGetWindowSize(window, &width, &height);
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_glfwPlatformSetWindowMonitor(window, NULL, 0, 0, width, height, 0);
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_glfwPlatformGetWindowFrameSize(window, &xoff, &yoff, NULL, NULL);
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_glfwPlatformSetWindowPos(window, xoff, yoff);
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}
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}
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for (i = 0; i < _glfw.monitorCount; i++)
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{
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if (_glfw.monitors[i] == monitor)
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{
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_glfw.monitorCount--;
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memmove(_glfw.monitors + i,
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_glfw.monitors + i + 1,
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((size_t) _glfw.monitorCount - i) * sizeof(_GLFWmonitor*));
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break;
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}
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}
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}
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if (_glfw.callbacks.monitor)
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_glfw.callbacks.monitor((GLFWmonitor*) monitor, action);
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if (action == GLFW_DISCONNECTED)
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_glfwFreeMonitor(monitor);
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}
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// Notifies shared code that a full screen window has acquired or released
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// a monitor
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//
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void _glfwInputMonitorWindow(_GLFWmonitor* monitor, _GLFWwindow* window)
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{
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monitor->window = window;
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW internal API //////
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//////////////////////////////////////////////////////////////////////////
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// Allocates and returns a monitor object with the specified name and dimensions
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//
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_GLFWmonitor* _glfwAllocMonitor(const char* name, int widthMM, int heightMM)
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{
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_GLFWmonitor* monitor = calloc(1, sizeof(_GLFWmonitor));
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monitor->widthMM = widthMM;
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monitor->heightMM = heightMM;
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if (name)
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monitor->name = _glfw_strdup(name);
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return monitor;
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}
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// Frees a monitor object and any data associated with it
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//
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void _glfwFreeMonitor(_GLFWmonitor* monitor)
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{
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if (monitor == NULL)
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return;
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_glfwPlatformFreeMonitor(monitor);
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_glfwFreeGammaArrays(&monitor->originalRamp);
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_glfwFreeGammaArrays(&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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// Allocates red, green and blue value arrays of the specified size
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//
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void _glfwAllocGammaArrays(GLFWgammaramp* ramp, unsigned int size)
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{
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ramp->red = calloc(size, sizeof(unsigned short));
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ramp->green = calloc(size, sizeof(unsigned short));
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ramp->blue = calloc(size, sizeof(unsigned short));
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ramp->size = size;
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}
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// Frees the red, green and blue value arrays and clears the struct
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//
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void _glfwFreeGammaArrays(GLFWgammaramp* ramp)
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{
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free(ramp->red);
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free(ramp->green);
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free(ramp->blue);
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memset(ramp, 0, sizeof(GLFWgammaramp));
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}
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// Chooses the video mode most closely matching the desired one
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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 = 0;
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if (desired->redBits != GLFW_DONT_CARE)
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colorDiff += abs(current->redBits - desired->redBits);
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if (desired->greenBits != GLFW_DONT_CARE)
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colorDiff += abs(current->greenBits - desired->greenBits);
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if (desired->blueBits != GLFW_DONT_CARE)
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colorDiff += abs(current->blueBits - 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 != GLFW_DONT_CARE)
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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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// Performs lexical comparison between two @ref GLFWvidmode structures
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//
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int _glfwCompareVideoModes(const GLFWvidmode* fm, const GLFWvidmode* sm)
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{
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return compareVideoModes(fm, sm);
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}
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// Splits a color depth into red, green and blue bit depths
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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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assert(count != NULL);
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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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if (!_glfw.monitorCount)
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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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assert(monitor != NULL);
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if (xpos)
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*xpos = 0;
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if (ypos)
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*ypos = 0;
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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 glfwGetMonitorWorkarea(GLFWmonitor* handle,
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int* xpos, int* ypos,
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int* width, int* height)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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assert(monitor != NULL);
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if (xpos)
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*xpos = 0;
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if (ypos)
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*ypos = 0;
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if (width)
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*width = 0;
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if (height)
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*height = 0;
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_GLFW_REQUIRE_INIT();
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_glfwPlatformGetMonitorWorkarea(monitor, xpos, ypos, width, height);
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}
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GLFWAPI void glfwGetMonitorPhysicalSize(GLFWmonitor* handle, int* widthMM, int* heightMM)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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assert(monitor != NULL);
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if (widthMM)
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*widthMM = 0;
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if (heightMM)
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*heightMM = 0;
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_GLFW_REQUIRE_INIT();
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if (widthMM)
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*widthMM = monitor->widthMM;
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if (heightMM)
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*heightMM = monitor->heightMM;
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}
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GLFWAPI void glfwGetMonitorContentScale(GLFWmonitor* handle,
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float* xscale, float* yscale)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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assert(monitor != NULL);
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if (xscale)
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*xscale = 0.f;
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if (yscale)
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*yscale = 0.f;
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_GLFW_REQUIRE_INIT();
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_glfwPlatformGetMonitorContentScale(monitor, xscale, yscale);
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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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assert(monitor != NULL);
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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 void glfwSetMonitorUserPointer(GLFWmonitor* handle, void* pointer)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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assert(monitor != NULL);
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_GLFW_REQUIRE_INIT();
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monitor->userPointer = pointer;
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}
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GLFWAPI void* glfwGetMonitorUserPointer(GLFWmonitor* handle)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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assert(monitor != NULL);
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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return monitor->userPointer;
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}
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GLFWAPI GLFWmonitorfun glfwSetMonitorCallback(GLFWmonitorfun cbfun)
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{
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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_GLFW_SWAP_POINTERS(_glfw.callbacks.monitor, cbfun);
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return cbfun;
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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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assert(monitor != NULL);
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assert(count != NULL);
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*count = 0;
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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if (!refreshVideoModes(monitor))
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return NULL;
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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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assert(monitor != NULL);
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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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GLFWAPI void glfwSetGamma(GLFWmonitor* handle, float gamma)
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{
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unsigned int i;
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unsigned short* values;
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GLFWgammaramp ramp;
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const GLFWgammaramp* original;
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assert(handle != NULL);
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assert(gamma > 0.f);
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assert(gamma <= FLT_MAX);
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_GLFW_REQUIRE_INIT();
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if (gamma != gamma || gamma <= 0.f || gamma > FLT_MAX)
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{
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_glfwInputError(GLFW_INVALID_VALUE, "Invalid gamma value %f", gamma);
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return;
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}
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original = glfwGetGammaRamp(handle);
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if (!original)
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return;
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values = calloc(original->size, sizeof(unsigned short));
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for (i = 0; i < original->size; i++)
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{
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float value;
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// Calculate intensity
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value = i / (float) (original->size - 1);
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// Apply gamma curve
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value = powf(value, 1.f / gamma) * 65535.f + 0.5f;
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// Clamp to value range
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value = _glfw_fminf(value, 65535.f);
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values[i] = (unsigned short) value;
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}
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ramp.red = values;
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ramp.green = values;
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ramp.blue = values;
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ramp.size = original->size;
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glfwSetGammaRamp(handle, &ramp);
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free(values);
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}
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GLFWAPI const GLFWgammaramp* glfwGetGammaRamp(GLFWmonitor* handle)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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assert(monitor != NULL);
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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_glfwFreeGammaArrays(&monitor->currentRamp);
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if (!_glfwPlatformGetGammaRamp(monitor, &monitor->currentRamp))
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return NULL;
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return &monitor->currentRamp;
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}
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GLFWAPI void glfwSetGammaRamp(GLFWmonitor* handle, const GLFWgammaramp* ramp)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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assert(monitor != NULL);
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assert(ramp != NULL);
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assert(ramp->size > 0);
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assert(ramp->red != NULL);
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assert(ramp->green != NULL);
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assert(ramp->blue != NULL);
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if (ramp->size <= 0)
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{
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_glfwInputError(GLFW_INVALID_VALUE,
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"Invalid gamma ramp size %i",
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ramp->size);
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return;
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}
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_GLFW_REQUIRE_INIT();
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if (!monitor->originalRamp.size)
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{
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if (!_glfwPlatformGetGammaRamp(monitor, &monitor->originalRamp))
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return;
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}
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_glfwPlatformSetGammaRamp(monitor, ramp);
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}
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