From 62f812873ca54f30ea892032039b2f635993a574 Mon Sep 17 00:00:00 2001
From: Camilla Berglund <elmindreda@elmindreda.org>
Date: Tue, 6 Sep 2011 15:47:17 +0200
Subject: [PATCH] Added gamma value error check.

---
 src/gamma.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/gamma.c b/src/gamma.c
index 787098a0..a82581dd 100644
--- a/src/gamma.c
+++ b/src/gamma.c
@@ -52,6 +52,13 @@ GLFWAPI void glfwSetGamma(float gamma)
         return;
     }
 
+    if (gamma <= 0.f)
+    {
+        _glfwSetError(GLFW_INVALID_VALUE,
+                      "glfwSetGamma: Gamma value must be greater than zero");
+        return;
+    }
+
     for (i = 0;  i < size;  i++)
     {
         float value = (float) i / ((float) (size - 1));