Added GLSL 4.20 pack/unpackSnorm2x16

glm/core/func_packing.hpp

@@ -54,6 +54,19 @@ namespace glm
     /// @see - <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4</a>
 	detail::uint32 packUnorm2x16(detail::tvec2<detail::float32> const & v);
 
+    //! First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values. 
+    //! Then, the results are packed into the returned 32-bit unsigned integer.
+    //! 
+    //! The conversion for component c of v to fixed point is done as follows:
+    //! packSnorm2x16: round(clamp(c, 0, +1) * 65535.0) 
+    //! 
+    //! The first component of the vector will be written to the least significant bits of the output; 
+    //! the last component will be written to the most significant bits.
+    //! 
+    /// @see - <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/packSnorm2x16.xml">GLSL packSnorm2x16 man page</a>
+    /// @see - <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4</a>
+	detail::uint32 packSnorm2x16(detail::tvec2<detail::float32> const & v);
+	
     //! First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values. 
     //! Then, the results are packed into the returned 32-bit unsigned integer.
     //! 

glm/core/func_packing.inl

@@ -35,6 +35,13 @@ GLM_FUNC_QUALIFIER detail::uint32 packUnorm2x16(detail::tvec2<detail::float32> c
 	return detail::uint32((B << 16) | A);
 }
 
+GLM_FUNC_QUALIFIER detail::uint32 packSnorm2x16(detail::tvec2<detail::float32> const & v)
+{
+	detail::uint16 A((detail::uint16)round(clamp(v.x,-1.0f, 1.0f) * 32767.0f));
+	detail::uint16 B((detail::uint16)round(clamp(v.y,-1.0f, 1.0f) * 32767.0f));
+	return detail::uint32((B << 16) | A);
+}
+
 GLM_FUNC_QUALIFIER detail::uint32 packUnorm4x8(detail::tvec4<detail::float32> const & v)
 {
 		detail::uint8 A((detail::uint8)round(clamp(v.x, 0.0f, 1.0f) * 255.0f));
@@ -62,6 +69,15 @@ GLM_FUNC_QUALIFIER detail::tvec2<detail::float32> unpackUnorm2x16(detail::uint32
 		B * 1.0f / 65535.0f);
 }
 
+GLM_FUNC_QUALIFIER detail::tvec2<detail::float32> unpackSnorm2x16(detail::uint32 const & p)
+{
+	detail::uint16 A(detail::uint16(p >> 0));
+	detail::uint16 B(detail::uint16(p >> 16));
+	return clamp(detail::tvec2<detail::float32>(
+		A * 1.0f / 32767.0f, 
+		B * 1.0f / 32767.0f));
+}
+
 GLM_FUNC_QUALIFIER detail::tvec4<detail::float32> unpackUnorm4x8(detail::uint32 const & p)
 {
 	detail::uint8 A(detail::uint8(p >> 0));