From 79bef6851156e710df564cc7607698b4e30152a7 Mon Sep 17 00:00:00 2001
From: Camilla Berglund <elmindreda@elmindreda.org>
Date: Thu, 24 May 2012 11:46:51 +0200
Subject: [PATCH] Only restore gamma ramp if it has been changed.

---
 src/cocoa_init.m | 3 ++-
 src/gamma.c      | 1 +
 src/internal.h   | 1 +
 src/win32_init.c | 3 ++-
 src/x11_init.c   | 2 +-
 5 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/cocoa_init.m b/src/cocoa_init.m
index 329bcfa4..7c208b90 100644
--- a/src/cocoa_init.m
+++ b/src/cocoa_init.m
@@ -129,7 +129,8 @@ int _glfwPlatformTerminate(void)
     }
 
     // Restore the original gamma ramp
-    _glfwPlatformSetGammaRamp(&_glfwLibrary.originalRamp);
+    if (_glfwLibrary.rampChanged)
+        _glfwPlatformSetGammaRamp(&_glfwLibrary.originalRamp);
 
     CGDisplayModeRelease(_glfwLibrary.NS.desktopMode);
 
diff --git a/src/gamma.c b/src/gamma.c
index 34cb22f5..21940b0e 100644
--- a/src/gamma.c
+++ b/src/gamma.c
@@ -112,5 +112,6 @@ GLFWAPI void glfwSetGammaRamp(const GLFWgammaramp* ramp)
 
     _glfwPlatformSetGammaRamp(ramp);
     _glfwLibrary.currentRamp = *ramp;
+    _glfwLibrary.rampChanged = GL_TRUE;
 }
 
diff --git a/src/internal.h b/src/internal.h
index 6398bdc5..681df74d 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -245,6 +245,7 @@ struct _GLFWlibrary
     GLFWgammaramp currentRamp;
     GLFWgammaramp originalRamp;
     int           originalRampSize;
+    GLboolean     rampChanged;
 
     // This is defined in the current port's platform.h
     _GLFW_PLATFORM_LIBRARY_WINDOW_STATE;
diff --git a/src/win32_init.c b/src/win32_init.c
index 2422dd4b..194ff6c4 100644
--- a/src/win32_init.c
+++ b/src/win32_init.c
@@ -190,7 +190,8 @@ int _glfwPlatformInit(void)
 int _glfwPlatformTerminate(void)
 {
     // Restore the original gamma ramp
-    _glfwPlatformSetGammaRamp(&_glfwLibrary.originalRamp);
+    if (_glfwLibrary.rampChanged)
+        _glfwPlatformSetGammaRamp(&_glfwLibrary.originalRamp);
 
     if (_glfwLibrary.Win32.classAtom)
     {
diff --git a/src/x11_init.c b/src/x11_init.c
index 6ea80351..3543c9f5 100644
--- a/src/x11_init.c
+++ b/src/x11_init.c
@@ -659,7 +659,7 @@ static Cursor createNULLCursor(void)
 
 static void terminateDisplay(void)
 {
-    if (_glfwLibrary.originalRampSize)
+    if (_glfwLibrary.originalRampSize && _glfwLibrary.rampChanged)
         _glfwPlatformSetGammaRamp(&_glfwLibrary.originalRamp);
 
     if (_glfwLibrary.X11.display)