From e600ec871f04a6d013dd8ed1fa53fca8e090f65d Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Tue, 5 Aug 2014 20:07:26 -0400
Subject: [PATCH] GLProgram: raise error when uniform location cannot be
 determined

---
 src/GLProgram.cc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/GLProgram.cc b/src/GLProgram.cc
index f154cdf..4fa8d09 100644
--- a/src/GLProgram.cc
+++ b/src/GLProgram.cc
@@ -114,7 +114,14 @@ static VALUE GLProgram_load_uniform_location(VALUE self, VALUE uniform)
     }
     if (uniform_index >= 0)
     {
-        glprogram->uniforms[uniform_index] = glGetUniformLocation(glprogram->id, uniform_cstr);
+        GLint location = glGetUniformLocation(glprogram->id, uniform_cstr);
+        if (location < 0)
+        {
+            rb_raise(rb_eRuntimeError,
+                     "Cannot determine uniform location for '%s'",
+                     uniform_cstr);
+        }
+        glprogram->uniforms[uniform_index] = location;
     }
     else
     {