Open source Star Ruler 2 source code!

2018-07-17 14:15:37 +02:00
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+//========================================================================
+// GLFW 3.0 X11 - 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
+//
+void _glfwInitGammaRamp(void)
+{
+    // RandR gamma support is only available with version 1.2 and above
+    if (_glfw.x11.randr.available &&
+        (_glfw.x11.randr.versionMajor > 1 ||
+         (_glfw.x11.randr.versionMajor == 1 &&
+          _glfw.x11.randr.versionMinor >= 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(_glfw.x11.display,
+                                                       _glfw.x11.root);
+
+        if (XRRGetCrtcGammaSize(_glfw.x11.display, rr->crtcs[0]) == 0)
+        {
+            // This is probably older Nvidia RandR with broken gamma support
+            // Flag it as useless and try Xf86VidMode below, if available
+            _glfw.x11.randr.gammaBroken = GL_TRUE;
+        }
+
+        XRRFreeScreenResources(rr);
+    }
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+//////                       GLFW platform API                      //////
+//////////////////////////////////////////////////////////////////////////
+
+void _glfwPlatformGetGammaRamp(_GLFWmonitor* monitor, GLFWgammaramp* ramp)
+{
+    if (_glfw.x11.randr.available && !_glfw.x11.randr.gammaBroken)
+    {
+        const size_t size = XRRGetCrtcGammaSize(_glfw.x11.display,
+                                                monitor->x11.crtc);
+        XRRCrtcGamma* gamma = XRRGetCrtcGamma(_glfw.x11.display,
+                                              monitor->x11.crtc);
+
+        _glfwAllocGammaArrays(ramp, size);
+
+        memcpy(ramp->red, gamma->red, size * sizeof(unsigned short));
+        memcpy(ramp->green, gamma->green, size * sizeof(unsigned short));
+        memcpy(ramp->blue, gamma->blue, size * sizeof(unsigned short));
+
+        XRRFreeGamma(gamma);
+    }
+    else if (_glfw.x11.vidmode.available)
+    {
+        int size;
+        XF86VidModeGetGammaRampSize(_glfw.x11.display, _glfw.x11.screen, &size);
+
+        _glfwAllocGammaArrays(ramp, size);
+
+        XF86VidModeGetGammaRamp(_glfw.x11.display,
+                                _glfw.x11.screen,
+                                ramp->size, ramp->red, ramp->green, ramp->blue);
+    }
+}
+
+void _glfwPlatformSetGammaRamp(_GLFWmonitor* monitor, const GLFWgammaramp* ramp)
+{
+    if (_glfw.x11.randr.available && !_glfw.x11.randr.gammaBroken)
+    {
+        XRRCrtcGamma* gamma = XRRAllocGamma(ramp->size);
+
+        memcpy(gamma->red, ramp->red, ramp->size * sizeof(unsigned short));
+        memcpy(gamma->green, ramp->green, ramp->size * sizeof(unsigned short));
+        memcpy(gamma->blue, ramp->blue, ramp->size * sizeof(unsigned short));
+
+        XRRSetCrtcGamma(_glfw.x11.display, monitor->x11.crtc, gamma);
+        XRRFreeGamma(gamma);
+    }
+    else if (_glfw.x11.vidmode.available)
+    {
+        XF86VidModeSetGammaRamp(_glfw.x11.display,
+                                _glfw.x11.screen,
+                                ramp->size,
+                                (unsigned short*) ramp->red,
+                                (unsigned short*) ramp->green,
+                                (unsigned short*) ramp->blue);
+    }
+}
+