Handle correctly GL apps which use hardcoded (non generated) names.

For example, tests/vparray mesa demo.

1 files changed, 78 insertions, 0 deletions

diff --git a/retrace.hpp b/retrace.hpp
new file mode 100644
index 0000000..c87fc94
--- /dev/null
+++ b/retrace.hpp
@@ -0,0 +1,78 @@
+/**************************************************************************
+ *
+ * Copyright 2011 Jose Fonseca
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#ifndef _RETRACE_HPP_
+#define _RETRACE_HPP_
+
+#include <map>
+
+namespace retrace {
+
+
+/**
+ * Handle map.
+ *
+ * It is just like a regular std::map<T, T> container, but lookups of missing
+ * keys return the key instead of default constructor.
+ *
+ * This is necessary for several GL named objects, where one can either request
+ * the implementation to generate an unique name, or pick a value never used
+ * before.
+ *
+ * XXX: In some cases, instead of returning the key, it would make more sense
+ * to return an unused data value (e.g., container count).
+ */
+template <class T>
+class map
+{
+private:
+    typedef std::map<T, T> base_type;
+    base_type base;
+
+public:
+
+    T & operator[] (const T &key) {
+        typename base_type::iterator it;
+        it = base.find(key);
+        if (it == base.end()) {
+            return (base[key] = key);
+        }
+        return it->second;
+    }
+    
+    const T & operator[] (const T &key) const {
+        typename base_type::const_iterator it;
+        it = base.find(key);
+        if (it == base.end()) {
+            return (base[key] = key);
+        }
+        return it->second;
+    }
+};
+
+
+} /* namespace retrace */
+
+#endif /* _RETRACE_HPP_ */