From fc6a9df304ec059e62adb0d8817a3ec31ad6a8f7 Mon Sep 17 00:00:00 2001
From: Bill Meltsner <bill@meltsner.com>
Date: Sat, 3 Mar 2012 20:33:55 -0500
Subject: [PATCH] =?UTF-8?q?Report=20lack=20of=20support=20for=20the=20subt?=
 =?UTF-8?q?ract=20blendmode=20through=20the=20Blue=20Screen=20of=20LO?=
 =?UTF-8?q?=CC=88VE=20instead=20of=20stderr=20spam.?=
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---
 src/modules/graphics/opengl/Graphics.cpp      | 2 +-
 src/modules/graphics/opengl/wrap_Graphics.cpp | 9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/modules/graphics/opengl/Graphics.cpp b/src/modules/graphics/opengl/Graphics.cpp
index 98629899e..1530a77a2 100644
--- a/src/modules/graphics/opengl/Graphics.cpp
+++ b/src/modules/graphics/opengl/Graphics.cpp
@@ -525,7 +525,7 @@ namespace opengl
 			}
 		} else {
 			if (mode == BLEND_SUBTRACTIVE) {
-				std::cerr << "This graphics card does not support the subtract blend mode!" << std::endl;
+				throw Exception("This graphics card does not support the subtract blend mode!");
 			}
 			// GL_FUNC_ADD is the default even without access to glBlendEquation, so that'll still work.
 		}
diff --git a/src/modules/graphics/opengl/wrap_Graphics.cpp b/src/modules/graphics/opengl/wrap_Graphics.cpp
index 8ece980f8..04b7076b5 100644
--- a/src/modules/graphics/opengl/wrap_Graphics.cpp
+++ b/src/modules/graphics/opengl/wrap_Graphics.cpp
@@ -532,7 +532,14 @@ namespace opengl
 		if (!Graphics::getConstant(str, mode))
 			return luaL_error(L, "Invalid blend mode: %s", str);
 
-		instance->setBlendMode(mode);
+		try
+		{
+			instance->setBlendMode(mode);
+		}
+		catch (love::Exception &e)
+		{
+			return luaL_error(L, e.what());
+		}
 		return 0;
 	}