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https://github.com/glfw/glfw.git
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330 lines
10 KiB
C
330 lines
10 KiB
C
//========================================================================
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// GLFW - An OpenGL framework
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// Platform: X11/GLX
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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 <stdio.h>
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#include <stdlib.h>
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//========================================================================
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// Dynamically load libraries
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//========================================================================
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static void initLibraries(void)
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{
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#ifdef _GLFW_DLOPEN_LIBGL
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int i;
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char* libGL_names[ ] =
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{
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"libGL.so",
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"libGL.so.1",
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"/usr/lib/libGL.so",
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"/usr/lib/libGL.so.1",
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NULL
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};
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_glfwLibrary.X11.libGL = NULL;
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for (i = 0; libGL_names[i] != NULL; i++)
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{
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_glfwLibrary.X11.libGL = dlopen(libGL_names[i], RTLD_LAZY | RTLD_GLOBAL);
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if (_glfwLibrary.X11.libGL)
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break;
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}
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#endif
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}
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//========================================================================
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// Initialize X11 display and look for supported X11 extensions
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//========================================================================
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static GLboolean initDisplay(void)
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{
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_glfwLibrary.X11.display = XOpenDisplay(0);
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if (!_glfwLibrary.X11.display)
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{
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fprintf(stderr, "Failed to open X display\n");
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_glfwSetError(GLFW_OPENGL_UNAVAILABLE);
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return GL_FALSE;
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}
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// As the API currently doesn't understand multiple display devices, we hardcode
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// this choice and hope for the best
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_glfwLibrary.X11.screen = DefaultScreen(_glfwLibrary.X11.display);
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_glfwLibrary.X11.root = RootWindow(_glfwLibrary.X11.display,
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_glfwLibrary.X11.screen);
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// Check for XF86VidMode extension
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#ifdef _GLFW_HAS_XF86VIDMODE
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_glfwLibrary.X11.XF86VidMode.available =
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XF86VidModeQueryExtension(_glfwLibrary.X11.display,
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&_glfwLibrary.X11.XF86VidMode.eventBase,
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&_glfwLibrary.X11.XF86VidMode.errorBase);
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#else
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_glfwLibrary.X11.XF86VidMode.available = GL_FALSE;
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#endif
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// Check for XRandR extension
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#ifdef _GLFW_HAS_XRANDR
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_glfwLibrary.X11.XRandR.available =
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XRRQueryExtension(_glfwLibrary.X11.display,
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&_glfwLibrary.X11.XRandR.eventBase,
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&_glfwLibrary.X11.XRandR.errorBase);
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if (!XRRQueryVersion(_glfwLibrary.X11.display,
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&_glfwLibrary.X11.XRandR.majorVersion,
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&_glfwLibrary.X11.XRandR.minorVersion))
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{
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fprintf(stderr, "Unable to query RandR version number\n");
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}
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#else
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_glfwLibrary.X11.XRandR.available = GL_FALSE;
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#endif
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// Check if GLX is supported on this display
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if (!glXQueryExtension(_glfwLibrary.X11.display, NULL, NULL))
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{
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fprintf(stderr, "GLX not supported\n");
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_glfwSetError(GLFW_OPENGL_UNAVAILABLE);
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return GL_FALSE;
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}
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if (!glXQueryVersion(_glfwLibrary.X11.display,
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&_glfwLibrary.X11.glxMajor,
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&_glfwLibrary.X11.glxMinor))
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{
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fprintf(stderr, "Unable to query GLX version\n");
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_glfwSetError(GLFW_OPENGL_UNAVAILABLE);
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return GL_FALSE;
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}
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return GL_TRUE;
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}
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//========================================================================
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// Detect gamma ramp support and save original gamma ramp, if available
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//========================================================================
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static void initGammaRamp(void)
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{
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#ifdef _GLFW_HAS_XRANDR
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// RandR gamma support is only available with version 1.2 and above
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if (_glfwLibrary.X11.XRandR.available &&
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(_glfwLibrary.X11.XRandR.majorVersion > 1 ||
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_glfwLibrary.X11.XRandR.majorVersion == 1 &&
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_glfwLibrary.X11.XRandR.minorVersion >= 2))
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{
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// FIXME: Assumes that all monitors have the same size gamma tables
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// This is reasonable as I suspect the that if they did differ, it
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// would imply that setting the gamma size to an arbitary size is
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// possible as well.
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XRRScreenResources* rr = XRRGetScreenResources(_glfwLibrary.X11.display,
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_glfwLibrary.X11.root);
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_glfwLibrary.originalRampSize = XRRGetCrtcGammaSize(_glfwLibrary.X11.display,
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rr->crtcs[0]);
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if (!_glfwLibrary.originalRampSize)
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{
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// This is probably Nvidia RandR with broken gamma support
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// Flag it as useless and try Xf86VidMode below, if available
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_glfwLibrary.X11.XRandR.gammaBroken = GL_TRUE;
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}
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XRRFreeScreenResources(rr);
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}
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#endif
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#if defined(_GLFW_HAS_XF86VIDMODE)
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if (_glfwLibrary.X11.XF86VidMode.available &&
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!_glfwLibrary.originalRampSize)
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{
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// Get the gamma size using XF86VidMode
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XF86VidModeGetGammaRampSize(_glfwLibrary.X11.display,
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_glfwLibrary.X11.screen,
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&_glfwLibrary.originalRampSize);
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}
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#endif
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if (!_glfwLibrary.originalRampSize)
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fprintf(stderr, "Gamma ramp setting unsupported\n");
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// Save the original gamma ramp
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_glfwPlatformGetGammaRamp(&_glfwLibrary.originalRamp);
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}
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//========================================================================
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// Create a blank cursor (for locked mouse mode)
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//========================================================================
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static Cursor createNULLCursor(void)
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{
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Pixmap cursormask;
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XGCValues xgc;
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GC gc;
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XColor col;
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Cursor cursor;
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// TODO: Add error checks
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cursormask = XCreatePixmap(_glfwLibrary.X11.display, _glfwLibrary.X11.root, 1, 1, 1);
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xgc.function = GXclear;
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gc = XCreateGC(_glfwLibrary.X11.display, cursormask, GCFunction, &xgc);
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XFillRectangle(_glfwLibrary.X11.display, cursormask, gc, 0, 0, 1, 1);
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col.pixel = 0;
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col.red = 0;
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col.flags = 4;
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cursor = XCreatePixmapCursor(_glfwLibrary.X11.display, cursormask, cursormask,
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&col, &col, 0, 0);
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XFreePixmap(_glfwLibrary.X11.display, cursormask);
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XFreeGC(_glfwLibrary.X11.display, gc);
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return cursor;
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}
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//========================================================================
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// Terminate X11 display
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//========================================================================
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static void terminateDisplay(void)
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{
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if (_glfwLibrary.originalRampSize)
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{
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_glfwPlatformSetGammaRamp(&_glfwLibrary.originalRamp);
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}
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if (_glfwLibrary.X11.display)
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{
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_glfwPlatformSetGammaRamp(&_glfwLibrary.originalRamp);
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XCloseDisplay(_glfwLibrary.X11.display);
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_glfwLibrary.X11.display = NULL;
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}
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW platform API //////
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//////////////////////////////////////////////////////////////////////////
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//========================================================================
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// Initialize various GLFW state
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//========================================================================
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int _glfwPlatformInit(void)
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{
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if (!initDisplay())
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return GL_FALSE;
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initGammaRamp();
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_glfwLibrary.X11.cursor = createNULLCursor();
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// Try to load libGL.so if necessary
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initLibraries();
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_glfwInitJoysticks();
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// Start the timer
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_glfwInitTimer();
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return GL_TRUE;
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}
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//========================================================================
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// Close window and shut down library
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//========================================================================
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int _glfwPlatformTerminate(void)
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{
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if (_glfwLibrary.X11.cursor)
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{
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XFreeCursor(_glfwLibrary.X11.display, _glfwLibrary.X11.cursor);
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_glfwLibrary.X11.cursor = (Cursor) 0;
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}
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terminateDisplay();
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_glfwTerminateJoysticks();
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// Unload libGL.so if necessary
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#ifdef _GLFW_DLOPEN_LIBGL
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if (_glfwLibrary.X11.libGL != NULL)
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{
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dlclose(_glfwLibrary.X11.libGL);
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_glfwLibrary.X11.libGL = NULL;
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}
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#endif
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return GL_TRUE;
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}
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//========================================================================
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// Get the GLFW version string
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//========================================================================
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const char* _glfwPlatformGetVersionString(void)
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{
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const char* version = "GLFW " _GLFW_VERSION_FULL
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#if defined(_GLFW_HAS_XRANDR)
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" XRandR"
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#endif
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#if defined(_GLFW_HAS_XF86VIDMODE)
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" Xf86VidMode"
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#else
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" (no mode switching support)"
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#endif
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#if defined(_GLFW_HAS_GLXGETPROCADDRESS)
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" glXGetProcAddress"
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#elif defined(_GLFW_HAS_GLXGETPROCADDRESSARB)
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" glXGetProcAddressARB"
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#elif defined(_GLFW_HAS_GLXGETPROCADDRESSEXT)
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" glXGetProcAddressEXT"
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#elif defined(_GLFW_DLOPEN_LIBGL)
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" dlopen(libGL)"
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#else
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" (no OpenGL extension support)"
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#endif
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#if defined(_GLFW_USE_LINUX_JOYSTICKS)
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" Linux joystick API"
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#else
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" (no joystick support)"
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#endif
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;
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return version;
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}
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