From 5cb963e9fd19f05f301c16558757eb5eceefd443 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Branimir=20Karad=C5=BEi=C4=87?= <branimirkaradzic@gmail.com>
Date: Fri, 23 May 2014 21:24:55 -0700
Subject: [PATCH] Updated README.

---
 README.md                         |  7 +++---
 examples/21-deferred/deferred.cpp |  3 +--
 examples/common/shaderlib.sh      | 38 +++++++++++++++++++++++++++++++
 3 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index a9800968..355ad7b9 100644
--- a/README.md
+++ b/README.md
@@ -249,10 +249,11 @@ Building
 Premake 4.4 beta5 ([prebuilt binaries are part of bx](https://github.com/bkaradzic/bx/tree/master/tools/bin))  
 [http://industriousone.com/premake/download](http://industriousone.com/premake/download)
 
-GNU make and CoreUtils  
-Windows users download GNU utilities from:  
+Windows users download GnuWin32 utilities from:  
 [http://gnuwin32.sourceforge.net/packages/make.htm](http://gnuwin32.sourceforge.net/packages/make.htm)  
-[http://gnuwin32.sourceforge.net/packages/coreutils.htm](http://gnuwin32.sourceforge.net/packages/coreutils.htm)
+[http://gnuwin32.sourceforge.net/packages/coreutils.htm](http://gnuwin32.sourceforge.net/packages/coreutils.htm)  
+[http://gnuwin32.sourceforge.net/packages/libiconv.htm](http://gnuwin32.sourceforge.net/packages/libiconv.htm)  
+[http://gnuwin32.sourceforge.net/packages/libintl.htm](http://gnuwin32.sourceforge.net/packages/libintl.htm)
 
 ### Getting source
 
diff --git a/examples/21-deferred/deferred.cpp b/examples/21-deferred/deferred.cpp
index 558e1dd6..4b4fbe8d 100644
--- a/examples/21-deferred/deferred.cpp
+++ b/examples/21-deferred/deferred.cpp
@@ -277,8 +277,7 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 	bgfx::UniformHandle s_depth  = bgfx::createUniform("s_depth",  bgfx::UniformType::Uniform1iv);
 	bgfx::UniformHandle s_light  = bgfx::createUniform("s_light",  bgfx::UniformType::Uniform1iv);
 
-	bgfx::UniformHandle u_mtx    = bgfx::createUniform("u_mtx",    bgfx::UniformType::Uniform4x4fv);
-
+	bgfx::UniformHandle u_mtx            = bgfx::createUniform("u_mtx",            bgfx::UniformType::Uniform4x4fv);
 	bgfx::UniformHandle u_lightPosRadius = bgfx::createUniform("u_lightPosRadius", bgfx::UniformType::Uniform4fv);
 	bgfx::UniformHandle u_lightRgbInnerR = bgfx::createUniform("u_lightRgbInnerR", bgfx::UniformType::Uniform4fv);
 
diff --git a/examples/common/shaderlib.sh b/examples/common/shaderlib.sh
index 199d1723..aea15288 100644
--- a/examples/common/shaderlib.sh
+++ b/examples/common/shaderlib.sh
@@ -49,6 +49,44 @@ vec3 decodeNormalUint(vec3 _encodedNormal)
 	return _encodedNormal * 2.0 - 1.0;
 }
 
+vec2 encodeNormalSphereMap(vec3 _normal)
+{
+	return normalize(_normal.xy) * sqrt(_normal.z * 0.5 + 0.5);
+}
+
+vec3 decodeNormalSphereMap(vec2 _encodedNormal)
+{
+	float zz = dot(_encodedNormal, _encodedNormal) * 2.0 - 1.0;
+	return vec3(normalize(_encodedNormal.xy) * sqrt(1.0 - zz*zz), zz);
+}
+
+// Reference:
+// Octahedron normal vector encoding
+// http://kriscg.blogspot.com/2014/04/octahedron-normal-vector-encoding.html
+vec2 octahedronWrap(vec2 _val)
+{
+	return (1.0 - abs(_val.yx) )
+		 * mix(vec2_splat(-1.0), vec2_splat(1.0), vec2(greaterThanEqual(_val.xy, vec2_splat(0.0) ) ) );
+}
+
+vec2 encodeNormalOctahedron(vec3 _normal)
+{
+	_normal /= abs(_normal.x) + abs(_normal.y) + abs(_normal.z);
+	_normal.xy = _normal.z >= 0.0 ? _normal.xy : octahedronWrap(_normal.xy);
+	_normal.xy = _normal.xy * 0.5 + 0.5;
+	return _normal.xy;
+}
+
+vec3 decodeNormalOctahedron(vec2 _encodedNormal)
+{
+	_encodedNormal = _encodedNormal * 2.0 - 1.0;
+
+	vec3 normal;
+	normal.z  = 1.0 - abs(_encodedNormal.x) - abs(_encodedNormal.y);
+	normal.xy = normal.z >= 0.0 ? _encodedNormal.xy : octahedronWrap(_encodedNormal.xy);
+	return normalize(normal);
+}
+
 // Reference:
 // RGB/XYZ Matrices
 // http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html