glfw/src/x11_gamma.c

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//========================================================================
// GLFW - An OpenGL library
// Platform: X11/GLX
// API version: 3.0
// WWW: http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
#include "internal.h"
#include <limits.h>
#include <string.h>
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
//========================================================================
// Detect gamma ramp support and save original gamma ramp, if available
//========================================================================
void _glfwInitGammaRamp(void)
{
#ifdef _GLFW_HAS_XRANDR
// RandR gamma support is only available with version 1.2 and above
if (_glfwLibrary.X11.RandR.available &&
(_glfwLibrary.X11.RandR.majorVersion > 1 ||
(_glfwLibrary.X11.RandR.majorVersion == 1 &&
_glfwLibrary.X11.RandR.minorVersion >= 2)))
{
// FIXME: Assumes that all monitors have the same size gamma tables
// This is reasonable as I suspect the that if they did differ, it
// would imply that setting the gamma size to an arbitary size is
// possible as well.
XRRScreenResources* rr = XRRGetScreenResources(_glfwLibrary.X11.display,
_glfwLibrary.X11.root);
_glfwLibrary.originalRampSize = XRRGetCrtcGammaSize(_glfwLibrary.X11.display,
rr->crtcs[0]);
if (!_glfwLibrary.originalRampSize)
{
// This is probably Nvidia RandR with broken gamma support
// Flag it as useless and try Xf86VidMode below, if available
_glfwLibrary.X11.RandR.gammaBroken = GL_TRUE;
}
XRRFreeScreenResources(rr);
}
#endif /*_GLFW_HAS_XRANDR*/
#if defined(_GLFW_HAS_XF86VIDMODE)
if (_glfwLibrary.X11.VidMode.available &&
!_glfwLibrary.originalRampSize)
{
// Get the gamma size using XF86VidMode
XF86VidModeGetGammaRampSize(_glfwLibrary.X11.display,
_glfwLibrary.X11.screen,
&_glfwLibrary.originalRampSize);
}
#endif /*_GLFW_HAS_XF86VIDMODE*/
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if (_glfwLibrary.originalRampSize)
{
// Save the original gamma ramp
_glfwPlatformGetGammaRamp(&_glfwLibrary.originalRamp);
_glfwLibrary.currentRamp = _glfwLibrary.originalRamp;
}
}
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//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
//////////////////////////////////////////////////////////////////////////
//========================================================================
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// Retrieve the currently set gamma ramp
//========================================================================
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void _glfwPlatformGetGammaRamp(GLFWgammaramp* ramp)
{
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if (_glfwLibrary.X11.RandR.available &&
!_glfwLibrary.X11.RandR.gammaBroken)
{
#if defined (_GLFW_HAS_XRANDR)
size_t size = GLFW_GAMMA_RAMP_SIZE * sizeof(unsigned short);
XRRScreenResources* rr = XRRGetScreenResources(_glfwLibrary.X11.display,
_glfwLibrary.X11.root);
XRRCrtcGamma* gamma = XRRGetCrtcGamma(_glfwLibrary.X11.display,
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);
memcpy(ramp->green, gamma->green, size);
memcpy(ramp->blue, gamma->blue, size);
XRRFreeGamma(gamma);
XRRFreeScreenResources(rr);
#endif /*_GLFW_HAS_XRANDR*/
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}
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else if (_glfwLibrary.X11.VidMode.available)
{
#if defined (_GLFW_HAS_XF86VIDMODE)
XF86VidModeGetGammaRamp(_glfwLibrary.X11.display,
_glfwLibrary.X11.screen,
GLFW_GAMMA_RAMP_SIZE,
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ramp->red,
ramp->green,
ramp->blue);
#endif /*_GLFW_HAS_XF86VIDMODE*/
}
}
//========================================================================
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// Push the specified gamma ramp to the monitor
//========================================================================
void _glfwPlatformSetGammaRamp(const GLFWgammaramp* ramp)
{
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if (_glfwLibrary.X11.RandR.available &&
!_glfwLibrary.X11.RandR.gammaBroken)
{
#if defined (_GLFW_HAS_XRANDR)
int i;
size_t size = GLFW_GAMMA_RAMP_SIZE * sizeof(unsigned short);
XRRScreenResources* rr = XRRGetScreenResources(_glfwLibrary.X11.display,
_glfwLibrary.X11.root);
// Update gamma per monitor
for (i = 0; i < rr->ncrtc; i++)
{
XRRCrtcGamma* gamma = XRRAllocGamma(GLFW_GAMMA_RAMP_SIZE);
memcpy(gamma->red, ramp->red, size);
memcpy(gamma->green, ramp->green, size);
memcpy(gamma->blue, ramp->blue, size);
XRRSetCrtcGamma(_glfwLibrary.X11.display, rr->crtcs[i], gamma);
XRRFreeGamma(gamma);
}
XRRFreeScreenResources(rr);
#endif /*_GLFW_HAS_XRANDR*/
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}
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else if (_glfwLibrary.X11.VidMode.available)
{
#if defined (_GLFW_HAS_XF86VIDMODE)
XF86VidModeSetGammaRamp(_glfwLibrary.X11.display,
_glfwLibrary.X11.screen,
GLFW_GAMMA_RAMP_SIZE,
(unsigned short*) ramp->red,
(unsigned short*) ramp->green,
(unsigned short*) ramp->blue);
#endif /*_GLFW_HAS_XF86VIDMODE*/
}
}