From 01ef44fa4ff800c03994d904a8eef445f1871b32 Mon Sep 17 00:00:00 2001
From: Michael Lutz <michi@icosahedron.de>
Date: Sat, 16 Jan 2021 16:43:40 +0100
Subject: Codechange: Allow blitter factories to decide at runtime if the
 blitter is usable.

---
 src/blitter/factory.hpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'src/blitter')

diff --git a/src/blitter/factory.hpp b/src/blitter/factory.hpp
index c7776f4a4..c76126fb5 100644
--- a/src/blitter/factory.hpp
+++ b/src/blitter/factory.hpp
@@ -73,6 +73,15 @@ protected:
 		}
 	}
 
+	/**
+	 * Is the blitter usable with the current drivers and hardware config?
+	 * @return True if the blitter can be instantiated.
+	 */
+	virtual bool IsUsable() const
+	{
+		return true;
+	}
+
 public:
 	virtual ~BlitterFactory()
 	{
@@ -119,7 +128,7 @@ public:
 		for (; it != GetBlitters().end(); it++) {
 			BlitterFactory *b = (*it).second;
 			if (strcasecmp(bname, b->name.c_str()) == 0) {
-				return b;
+				return b->IsUsable() ? b : nullptr;
 			}
 		}
 		return nullptr;
-- 
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