mirror of
https://github.com/glfw/glfw.git
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557 lines
16 KiB
C
557 lines
16 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 <limits.h>
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//************************************************************************
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//**** GLFW internal functions ****
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//************************************************************************
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//========================================================================
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// Convert BPP to RGB bits (based on "best guess")
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//========================================================================
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static void BPP2RGB(int bpp, int* r, int* g, int* b)
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{
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int delta;
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// Special case: BPP = 32 (I don't think this is necessary for X11??)
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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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*r = *g = *b = bpp / 3;
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delta = bpp - (*r * 3);
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if (delta >= 1)
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*g = *g + 1;
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if (delta == 2)
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*r = *r + 1;
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}
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//========================================================================
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// Finds the video mode closest in size to the specified desired size
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//========================================================================
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int _glfwGetClosestVideoMode(int screen, int* width, int* height, int* rate)
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{
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#if defined(_GLFW_HAS_XRANDR)
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int i, match, bestmatch;
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int sizecount, bestsize;
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int ratecount, bestrate;
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short* ratelist;
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XRRScreenConfiguration* sc;
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XRRScreenSize* sizelist;
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if (_glfwLibrary.XRandR.available)
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{
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sc = XRRGetScreenInfo(_glfwLibrary.display,
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RootWindow(_glfwLibrary.display, screen));
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sizelist = XRRConfigSizes(sc, &sizecount);
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// Find the best matching mode
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bestsize = -1;
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bestmatch = INT_MAX;
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for (i = 0; i < sizecount; i++)
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{
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match = (*width - sizelist[i].width) *
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(*width - sizelist[i].width) +
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(*height - sizelist[i].height) *
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(*height - sizelist[i].height);
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if (match < bestmatch)
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{
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bestmatch = match;
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bestsize = i;
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}
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}
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if (bestsize != -1)
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{
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// Report width & height of best matching mode
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*width = sizelist[bestsize].width;
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*height = sizelist[bestsize].height;
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if (*rate > 0)
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{
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ratelist = XRRConfigRates(sc, bestsize, &ratecount);
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bestrate = -1;
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bestmatch = INT_MAX;
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for (i = 0; i < ratecount; i++)
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{
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match = abs(ratelist[i] - *rate);
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if (match < bestmatch)
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{
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bestmatch = match;
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bestrate = ratelist[i];
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}
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}
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if (bestrate != -1)
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*rate = bestrate;
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}
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}
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// Free modelist
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XRRFreeScreenConfigInfo(sc);
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if (bestsize != -1)
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return bestsize;
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}
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#elif defined(_GLFW_HAS_XF86VIDMODE)
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XF86VidModeModeInfo** modelist;
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int modecount, i, bestmode, bestmatch, match;
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// Use the XF86VidMode extension to control video resolution
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if (_glfwLibrary.XF86VidMode.available)
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{
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// Get a list of all available display modes
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XF86VidModeGetAllModeLines(_glfwLibrary.display, screen,
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&modecount, &modelist);
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// Find the best matching mode
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bestmode = -1;
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bestmatch = INT_MAX;
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for (i = 0; i < modecount; i++)
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{
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match = (*width - modelist[i]->hdisplay) *
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(*width - modelist[i]->hdisplay) +
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(*height - modelist[i]->vdisplay) *
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(*height - modelist[i]->vdisplay);
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if (match < bestmatch)
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{
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bestmatch = match;
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bestmode = i;
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}
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}
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if (bestmode != -1)
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{
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// Report width & height of best matching mode
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*width = modelist[bestmode]->hdisplay;
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*height = modelist[bestmode]->vdisplay;
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}
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// Free modelist
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XFree(modelist);
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if (bestmode != -1)
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return bestmode;
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}
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#endif
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// Default: Simply use the screen resolution
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*width = DisplayWidth(_glfwLibrary.display, screen);
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*height = DisplayHeight(_glfwLibrary.display, screen);
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return 0;
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}
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//========================================================================
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// Change the current video mode
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//========================================================================
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void _glfwSetVideoModeMODE(int screen, int mode, int rate)
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{
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#if defined(_GLFW_HAS_XRANDR)
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XRRScreenConfiguration* sc;
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Window root;
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if (_glfwLibrary.XRandR.available)
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{
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root = RootWindow(_glfwLibrary.display, screen);
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sc = XRRGetScreenInfo(_glfwLibrary.display, root);
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// Remember old size and flag that we have changed the mode
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if (!_glfwWin.FS.modeChanged)
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{
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_glfwWin.FS.oldSizeID = XRRConfigCurrentConfiguration(sc, &_glfwWin.FS.oldRotation);
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_glfwWin.FS.oldWidth = DisplayWidth(_glfwLibrary.display, screen);
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_glfwWin.FS.oldHeight = DisplayHeight(_glfwLibrary.display, screen);
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_glfwWin.FS.modeChanged = GL_TRUE;
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}
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if (rate > 0)
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{
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// Set desired configuration
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XRRSetScreenConfigAndRate(_glfwLibrary.display,
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sc,
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root,
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mode,
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RR_Rotate_0,
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(short) rate,
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CurrentTime);
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}
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else
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{
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// Set desired configuration
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XRRSetScreenConfig(_glfwLibrary.display,
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sc,
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root,
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mode,
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RR_Rotate_0,
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CurrentTime);
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}
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XRRFreeScreenConfigInfo(sc);
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}
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#elif defined(_GLFW_HAS_XF86VIDMODE)
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XF86VidModeModeInfo **modelist;
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int modecount;
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// Use the XF86VidMode extension to control video resolution
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if (_glfwLibrary.XF86VidMode.available)
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{
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// Get a list of all available display modes
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XF86VidModeGetAllModeLines(_glfwLibrary.display, screen,
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&modecount, &modelist);
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// Unlock mode switch if necessary
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if (_glfwWin.FS.modeChanged)
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XF86VidModeLockModeSwitch(_glfwLibrary.display, screen, 0);
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// Change the video mode to the desired mode
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XF86VidModeSwitchToMode(_glfwLibrary.display, screen,
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modelist[mode]);
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// Set viewport to upper left corner (where our window will be)
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XF86VidModeSetViewPort(_glfwLibrary.display, screen, 0, 0);
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// Lock mode switch
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XF86VidModeLockModeSwitch(_glfwLibrary.display, screen, 1);
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// Remember old mode and flag that we have changed the mode
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if (!_glfwWin.FS.modeChanged)
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{
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_glfwWin.FS.oldMode = *modelist[0];
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_glfwWin.FS.modeChanged = GL_TRUE;
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}
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// Free mode list
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XFree(modelist);
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}
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#endif
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}
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//========================================================================
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// Change the current video mode
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//========================================================================
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void _glfwSetVideoMode(int screen, int* width, int* height, int* rate)
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{
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int bestmode;
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// Find a best match mode
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bestmode = _glfwGetClosestVideoMode(screen, width, height, rate);
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// Change mode
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_glfwSetVideoModeMODE(screen, bestmode, *rate);
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}
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//========================================================================
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// Restore the previously saved (original) video mode
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//========================================================================
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void _glfwRestoreVideoMode(void)
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{
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if (_glfwWin.FS.modeChanged)
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{
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#if defined(_GLFW_HAS_XRANDR)
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if (_glfwLibrary.XRandR.available)
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{
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XRRScreenConfiguration* sc;
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if (_glfwLibrary.XRandR.available)
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{
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sc = XRRGetScreenInfo(_glfwLibrary.display, _glfwWin.root);
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XRRSetScreenConfig(_glfwLibrary.display,
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sc,
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_glfwWin.root,
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_glfwWin.FS.oldSizeID,
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_glfwWin.FS.oldRotation,
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CurrentTime);
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XRRFreeScreenConfigInfo(sc);
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}
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}
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#elif defined(_GLFW_HAS_XF86VIDMODE)
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if (_glfwLibrary.XF86VidMode.available)
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{
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// Unlock mode switch
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XF86VidModeLockModeSwitch(_glfwLibrary.display, _glfwWin.screen, 0);
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// Change the video mode back to the old mode
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XF86VidModeSwitchToMode(_glfwLibrary.display,
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_glfwWin.screen,
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&_glfwWin.FS.oldMode);
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}
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#endif
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_glfwWin.FS.modeChanged = GL_FALSE;
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}
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}
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//************************************************************************
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//**** Platform implementation functions ****
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//************************************************************************
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struct _glfwResolution
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{
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int width;
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int height;
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};
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//========================================================================
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// List available video modes
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//========================================================================
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int _glfwPlatformGetVideoModes(GLFWvidmode* list, int maxcount)
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{
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int count, k, l, r, g, b, rgba, gl;
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int depth, screen;
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Display* dpy;
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XVisualInfo* vislist;
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XVisualInfo dummy;
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int viscount, rgbcount, rescount;
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int* rgbarray;
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struct _glfwResolution* resarray;
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#if defined(_GLFW_HAS_XRANDR)
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XRRScreenConfiguration* sc;
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XRRScreenSize* sizelist;
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int sizecount;
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#elif defined(_GLFW_HAS_XF86VIDMODE)
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XF86VidModeModeInfo** modelist;
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int modecount, width, height;
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#endif
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// Get display and screen
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dpy = _glfwLibrary.display;
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screen = DefaultScreen(dpy);
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// Get list of visuals
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vislist = XGetVisualInfo(dpy, 0, &dummy, &viscount);
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if (vislist == NULL)
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return 0;
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rgbarray = (int*) malloc(sizeof(int) * viscount);
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rgbcount = 0;
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// Build RGB array
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for (k = 0; k < viscount; k++)
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{
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// Does the visual support OpenGL & true color?
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glXGetConfig(dpy, &vislist[k], GLX_USE_GL, &gl);
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glXGetConfig(dpy, &vislist[k], GLX_RGBA, &rgba);
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if (gl && rgba)
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{
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// Get color depth for this visual
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depth = vislist[k].depth;
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// Convert to RGB
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BPP2RGB(depth, &r, &g, &b);
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depth = (r << 16) | (g << 8) | b;
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// Is this mode unique?
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for (l = 0; l < rgbcount; l++)
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{
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if (depth == rgbarray[l])
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break;
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}
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if (l >= rgbcount)
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{
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rgbarray[rgbcount] = depth;
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rgbcount++;
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}
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}
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}
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rescount = 0;
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resarray = NULL;
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// Build resolution array
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#if defined(_GLFW_HAS_XRANDR)
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if (_glfwLibrary.XRandR.available)
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{
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sc = XRRGetScreenInfo(dpy, RootWindow(dpy, screen));
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sizelist = XRRConfigSizes(sc, &sizecount);
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resarray = (struct _glfwResolution*) malloc(sizeof(struct _glfwResolution) * sizecount);
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for (k = 0; k < sizecount; k++)
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{
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resarray[rescount].width = sizelist[k].width;
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resarray[rescount].height = sizelist[k].height;
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rescount++;
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}
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XRRFreeScreenConfigInfo(sc);
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}
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#elif defined(_GLFW_HAS_XF86VIDMODE)
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if (_glfwLibrary.XF86VidMode.available)
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{
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XF86VidModeGetAllModeLines(dpy, screen, &modecount, &modelist);
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resarray = (struct _glfwResolution*) malloc(sizeof(struct _glfwResolution) * modecount);
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for (k = 0; k < modecount; k++)
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{
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width = modelist[k]->hdisplay;
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height = modelist[k]->vdisplay;
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// Is this mode unique?
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for (l = 0; l < rescount; l++)
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{
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if (width == resarray[l].width && height == resarray[l].height)
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break;
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}
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if (l >= rescount)
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{
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resarray[rescount].width = width;
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resarray[rescount].height = height;
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rescount++;
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}
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}
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XFree(modelist);
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}
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#endif
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if (!resarray)
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{
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rescount = 1;
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resarray = (struct _glfwResolution*) malloc(sizeof(struct _glfwResolution) * rescount);
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resarray[ 0 ].width = DisplayWidth(dpy, screen);
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resarray[ 0 ].height = DisplayHeight(dpy, screen);
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}
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// Build permutations of colors and resolutions
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count = 0;
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for (k = 0; k < rgbcount && count < maxcount; k++)
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{
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for (l = 0; l < rescount && count < maxcount; l++)
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{
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list[count].Width = resarray[l].width;
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list[count].Height = resarray[l].height;
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list[count].RedBits = (rgbarray[k] >> 16) & 255;
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list[count].GreenBits = (rgbarray[k] >> 8) & 255;
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list[count].BlueBits = rgbarray[k] & 255;
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count++;
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}
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}
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// Free visuals list
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XFree(vislist);
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free(resarray);
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free(rgbarray);
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return count;
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}
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//========================================================================
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// Get the desktop video mode
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//========================================================================
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void _glfwPlatformGetDesktopMode(GLFWvidmode* mode)
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{
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Display* dpy;
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int bpp, screen;
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#if defined(_GLFW_HAS_XF86VIDMODE)
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XF86VidModeModeInfo** modelist;
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int modecount;
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#endif
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// Get display and screen
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dpy = _glfwLibrary.display;
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screen = DefaultScreen(dpy);
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// Get display depth
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bpp = DefaultDepth(dpy, screen);
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// Convert BPP to RGB bits
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BPP2RGB(bpp, &mode->RedBits, &mode->GreenBits, &mode->BlueBits);
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#if defined(_GLFW_HAS_XRANDR)
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if (_glfwLibrary.XRandR.available)
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{
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if (_glfwWin.FS.modeChanged)
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{
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mode->Width = _glfwWin.FS.oldWidth;
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mode->Height = _glfwWin.FS.oldHeight;
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return;
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}
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}
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#elif defined(_GLFW_HAS_XF86VIDMODE)
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if (_glfwLibrary.XF86VidMode.available)
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{
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if (_glfwWin.FS.modeChanged)
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{
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// The old (desktop) mode is stored in _glfwWin.FS.oldMode
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mode->Width = _glfwWin.FS.oldMode.hdisplay;
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mode->Height = _glfwWin.FS.oldMode.vdisplay;
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}
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else
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{
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// Use the XF86VidMode extension to get list of video modes
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XF86VidModeGetAllModeLines(dpy, screen, &modecount, &modelist);
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// The first mode in the list is the current (desktio) mode
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mode->Width = modelist[0]->hdisplay;
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mode->Height = modelist[0]->vdisplay;
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// Free list
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XFree(modelist);
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}
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return;
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}
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#endif
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// Get current display width and height
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mode->Width = DisplayWidth(dpy, screen);
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mode->Height = DisplayHeight(dpy, screen);
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}
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