From 7c67703bca0daef11c2213bae73da891645d899c Mon Sep 17 00:00:00 2001
From: Christophe Riccio <g.truc.creation@gmail.com>
Date: Mon, 9 May 2011 12:33:00 +0100
Subject: [PATCH] Extended bit field functions: #4

---
 glm/gtx/bit.hpp | 16 ++++++++++++++++
 glm/gtx/bit.inl | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/glm/gtx/bit.hpp b/glm/gtx/bit.hpp
index f6c689f2..676b1ad0 100644
--- a/glm/gtx/bit.hpp
+++ b/glm/gtx/bit.hpp
@@ -101,6 +101,22 @@ namespace glm
 		template <typename genType>
 		genType bitRotateLeft(genType const & In, std::size_t Shift);
 
+		//! Set to 1 a range of bits.
+		//! From GLM_GTX_bit extension.
+		template <typename genIUType>
+		genIUType fillBitfieldWithOne(
+			genIUType const & Value,
+			int const & FromBit, 
+			int const & ToBit);
+
+		//! Set to 0 a range of bits.
+		//! From GLM_GTX_bit extension.
+		template <typename genIUType>
+		genIUType fillBitfieldWithZero(
+			genIUType const & Value,
+			int const & FromBit, 
+			int const & ToBit);
+
 		///@}
 
 	}//namespace bit
diff --git a/glm/gtx/bit.inl b/glm/gtx/bit.inl
index 5c3ec8e2..f1d29c35 100644
--- a/glm/gtx/bit.inl
+++ b/glm/gtx/bit.inl
@@ -738,6 +738,40 @@ GLM_FUNC_QUALIFIER detail::tvec4<valType> bitRotateLeft
 		bitRotateLeft(Value[3], Shift));
 }
 
+template <typename genIUType>
+GLM_FUNC_QUALIFIER genIUType fillBitfieldWithOne
+(
+	genIUType const & Value,
+	int const & FromBit, 
+	int const & ToBit
+)
+{
+	assert(FromBit <= ToBit);
+	assert(ToBit <= sizeof(genIUType) * std::size_t(8));
+
+	genIUType Result = Value;
+	for(std::size_t i = 0; i <= ToBit; ++i)
+		Result |= (1 << i);
+	return Result;
+}
+
+template <typename genIUType>
+GLM_FUNC_QUALIFIER genIUType fillBitfieldWithZero
+(
+	genIUType const & Value,
+	int const & FromBit, 
+	int const & ToBit
+)
+{
+	assert(FromBit <= ToBit);
+	assert(ToBit <= sizeof(genIUType) * std::size_t(8));
+
+	genIUType Result = Value;
+	for(std::size_t i = 0; i <= ToBit; ++i)
+		Result &= ~(1 << i);
+	return Result;
+}
+
 }//namespace bit
 }//namespace gtx
 }//namespace glm