Generate hash of uniform buffer format on the fly

--HG--
branch : opengl3

code/nel/include/nel/3d/uniform_buffer_format.h

@@ -38,6 +38,8 @@ namespace NL3D {
 class CUniformBufferFormat
 {
 public:
+	CUniformBufferFormat() : m_Hash(0) { }
+
 	// When changing, update
 	//     - s_TypeAlignment
 	//     - s_TypeSize
@@ -96,7 +98,7 @@ public:
 
 	inline const CEntry &get(sint i) const { return m_Entries[i]; }
 	inline size_t size() const { return m_Entries.size(); }
-	inline void clear() { m_Entries.clear(); }
+	inline void clear() { m_Entries.clear(); m_Hash = 0; }
 
 private:
 	static const sint s_TypeAlignment[];
@@ -104,6 +106,7 @@ private:
 
 	typedef std::vector<CEntry> TEntries;
 	TEntries m_Entries;
+	size_t m_Hash;
 
 };
 

code/nel/src/3d/uniform_buffer_format.cpp

@@ -30,6 +30,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <nel/3d/uniform_buffer_format.h>
 
 #include <nel/misc/debug.h>
+#include <nel/misc/wang_hash.h>
 
 namespace NL3D {
 
@@ -107,6 +108,12 @@ sint CUniformBufferFormat::push(const std::string &name, TType type, sint count)
 	entry.Type = type;
 	entry.Offset = alignOffset;
 	entry.Count = count;
+#if (HAVE_X86_64)
+	m_Hash = NLMISC::wangHash64(m_Hash ^ ((uint64)type | ((uint64)count << 32)));
+#else
+	m_Hash = NLMISC::wangHash(m_Hash ^ (uint32)type);
+	m_Hash = NLMISC::wangHash(m_Hash ^ (uint32)count);
+#endif
 	return alignOffset;
 }