mirror of
https://github.com/gwm17/glfw.git
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127 lines
4.6 KiB
C
127 lines
4.6 KiB
C
//========================================================================
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// GLFW - An OpenGL library
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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) 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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#include <string.h>
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//////////////////////////////////////////////////////////////////////////
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////// GLFW platform API //////
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//////////////////////////////////////////////////////////////////////////
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//========================================================================
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// Retrieve the currently set gamma ramp
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//========================================================================
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void _glfwPlatformGetGammaRamp(GLFWgammaramp* ramp)
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{
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if (_glfwLibrary.X11.RandR.available &&
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!_glfwLibrary.X11.RandR.gammaBroken)
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{
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#if defined (_GLFW_HAS_XRANDR)
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size_t size = GLFW_GAMMA_RAMP_SIZE * sizeof(unsigned short);
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XRRScreenResources* rr = XRRGetScreenResources(_glfwLibrary.X11.display,
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_glfwLibrary.X11.root);
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XRRCrtcGamma* gamma = XRRGetCrtcGamma(_glfwLibrary.X11.display,
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rr->crtcs[0]);
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// TODO: Handle case of original ramp size having a size other than 256
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memcpy(ramp->red, gamma->red, size);
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memcpy(ramp->green, gamma->green, size);
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memcpy(ramp->blue, gamma->blue, size);
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XRRFreeGamma(gamma);
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XRRFreeScreenResources(rr);
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#endif /*_GLFW_HAS_XRANDR*/
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}
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else if (_glfwLibrary.X11.VidMode.available)
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{
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#if defined (_GLFW_HAS_XF86VIDMODE)
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XF86VidModeGetGammaRamp(_glfwLibrary.X11.display,
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_glfwLibrary.X11.screen,
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GLFW_GAMMA_RAMP_SIZE,
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ramp->red,
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ramp->green,
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ramp->blue);
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#endif /*_GLFW_HAS_XF86VIDMODE*/
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}
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}
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//========================================================================
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// Push the specified gamma ramp to the monitor
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//========================================================================
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void _glfwPlatformSetGammaRamp(const GLFWgammaramp* ramp)
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{
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if (_glfwLibrary.X11.RandR.available &&
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!_glfwLibrary.X11.RandR.gammaBroken)
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{
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#if defined (_GLFW_HAS_XRANDR)
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int i;
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size_t size = GLFW_GAMMA_RAMP_SIZE * sizeof(unsigned short);
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XRRScreenResources* rr = XRRGetScreenResources(_glfwLibrary.X11.display,
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_glfwLibrary.X11.root);
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// Update gamma per monitor
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for (i = 0; i < rr->ncrtc; i++)
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{
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XRRCrtcGamma* gamma = XRRAllocGamma(GLFW_GAMMA_RAMP_SIZE);
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memcpy(gamma->red, ramp->red, size);
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memcpy(gamma->green, ramp->green, size);
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memcpy(gamma->blue, ramp->blue, size);
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XRRSetCrtcGamma(_glfwLibrary.X11.display, rr->crtcs[i], gamma);
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XRRFreeGamma(gamma);
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}
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XRRFreeScreenResources(rr);
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#endif /*_GLFW_HAS_XRANDR*/
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}
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else if (_glfwLibrary.X11.VidMode.available)
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{
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#if defined (_GLFW_HAS_XF86VIDMODE)
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XF86VidModeSetGammaRamp(_glfwLibrary.X11.display,
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_glfwLibrary.X11.screen,
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GLFW_GAMMA_RAMP_SIZE,
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(unsigned short*) ramp->red,
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(unsigned short*) ramp->green,
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(unsigned short*) ramp->blue);
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#endif /*_GLFW_HAS_XF86VIDMODE*/
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}
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}
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