Shaders: added Tangent generic vertex attribute.

doc/changelog.dox

@@ -160,6 +160,10 @@ See also:
     bootstrap project for using Magnum together with wxWidgets (see
     [mosra/magnum-bootstrap#19](https://github.com/mosra/magnum-bootstrap/pull/19))
 
+@subsubsection changelog-latest-new-shaders Shaders library
+
+-   Added @ref Shaders::Generic3D::Tangent generic vertex attribute definition
+
 @subsubsection changelog-latest-new-text Text library
 
 -   A new @ref Text::AbstractGlyphCache base now makes @ref Text::AbstractFont

src/Magnum/Shaders/Generic.h

@@ -69,6 +69,13 @@ template<UnsignedInt dimensions> struct Generic {
      */
     typedef GL::Attribute<2, Vector3> Normal;
 
+    /**
+     * @brief Vertex tangent
+     *
+     * @ref Magnum::Vector3 "Vector3", defined only in 3D.
+     */
+    typedef GL::Attribute<4, Vector3> Tangent;
+
     /**
      * @brief Three-component vertex color.
      *
@@ -136,6 +143,7 @@ template<> struct Generic<2>: BaseGeneric {
 template<> struct Generic<3>: BaseGeneric {
     typedef GL::Attribute<0, Vector3> Position;
     typedef GL::Attribute<2, Vector3> Normal;
+    typedef GL::Attribute<4, Vector3> Tangent;
 };
 #endif
 

src/Magnum/Shaders/generic.glsl

@@ -29,3 +29,4 @@
 #define TEXTURECOORDINATES_ATTRIBUTE_LOCATION 1
 #define NORMAL_ATTRIBUTE_LOCATION 2
 #define COLOR_ATTRIBUTE_LOCATION 3
+#define TANGENT_ATTRIBUTE_LOCATION 4