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https://github.com/glfw/glfw.git
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127 lines
4.8 KiB
C
127 lines
4.8 KiB
C
//========================================================================
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// GLFW - An OpenGL library
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// Platform: X11
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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 internal API //////
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//////////////////////////////////////////////////////////////////////////
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// Detect gamma ramp support
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//
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void _glfwInitGammaRamp(void)
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{
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// RandR gamma support is only available with version 1.2 and above
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if (_glfw.x11.randr.available &&
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(_glfw.x11.randr.versionMajor > 1 ||
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(_glfw.x11.randr.versionMajor == 1 &&
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_glfw.x11.randr.versionMinor >= 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(_glfw.x11.display,
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_glfw.x11.root);
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if (XRRGetCrtcGammaSize(_glfw.x11.display, rr->crtcs[0]) == 0)
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{
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// This is probably older Nvidia RandR with broken gamma support
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// Flag it as useless and try Xf86VidMode below, if available
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_glfw.x11.randr.gammaBroken = GL_TRUE;
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}
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XRRFreeScreenResources(rr);
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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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void _glfwPlatformGetGammaRamp(_GLFWmonitor* monitor, GLFWgammaramp* ramp)
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{
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if (_glfw.x11.randr.available && !_glfw.x11.randr.gammaBroken)
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{
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const size_t size = XRRGetCrtcGammaSize(_glfw.x11.display,
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monitor->x11.crtc);
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XRRCrtcGamma* gamma = XRRGetCrtcGamma(_glfw.x11.display,
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monitor->x11.crtc);
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_glfwAllocGammaRamp(ramp, size);
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memcpy(ramp->red, gamma->red, size * sizeof(unsigned short));
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memcpy(ramp->green, gamma->green, size * sizeof(unsigned short));
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memcpy(ramp->blue, gamma->blue, size * sizeof(unsigned short));
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XRRFreeGamma(gamma);
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}
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else if (_glfw.x11.vidmode.available)
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{
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int size;
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XF86VidModeGetGammaRampSize(_glfw.x11.display, _glfw.x11.screen, &size);
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_glfwAllocGammaRamp(ramp, size);
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XF86VidModeGetGammaRamp(_glfw.x11.display,
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_glfw.x11.screen,
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ramp->size, ramp->red, ramp->green, ramp->blue);
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}
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}
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void _glfwPlatformSetGammaRamp(_GLFWmonitor* monitor, const GLFWgammaramp* ramp)
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{
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if (_glfw.x11.randr.available && !_glfw.x11.randr.gammaBroken)
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{
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XRRCrtcGamma* gamma = XRRAllocGamma(ramp->size);
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memcpy(gamma->red, ramp->red, ramp->size * sizeof(unsigned short));
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memcpy(gamma->green, ramp->green, ramp->size * sizeof(unsigned short));
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memcpy(gamma->blue, ramp->blue, ramp->size * sizeof(unsigned short));
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XRRSetCrtcGamma(_glfw.x11.display, monitor->x11.crtc, gamma);
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XRRFreeGamma(gamma);
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}
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else if (_glfw.x11.vidmode.available)
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{
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XF86VidModeSetGammaRamp(_glfw.x11.display,
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_glfw.x11.screen,
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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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}
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}
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