Orange; WIP commit for inclusion of "Tangent" vector in rendering.

This first implementation only supports it for Meshes with UV maps, and
only tangents in V direction.

Tangent diffuse:
http://www.blender.org/bf/0001_0080.avi
Tangent spec, diffuse, and bump:
http://www.blender.org/bf/20001_0080.avi

NOTE: since UV coordinates are still very badly subsurfed, this won't work
well for subsurf meshes... on the todo.

On the todo;
- generate tangents for meshes without UV (with some options)
- use tangents from Curve/Surface
- add the Ashkimin shader from tracker

-----

Important bugfix; curves didn't render anymore since yesterday. :)

1 files changed, 4 insertions, 3 deletions

diff --git a/source/blender/makesdna/DNA_material_types.h b/source/blender/makesdna/DNA_material_types.h
index ff2eb7194eb..9991148ad3d 100644
--- a/source/blender/makesdna/DNA_material_types.h
+++ b/source/blender/makesdna/DNA_material_types.h
@@ -169,6 +169,8 @@ typedef struct Material {
 #define MA_FULL_OSA		0x800000
 #define MA_TANGENT_STR	0x1000000
 #define MA_SHADBUF		0x2000000
+		/* note; we drop MA_TANGENT_STR later to become tangent_u */
+#define MA_TANGENT_V	0x4000000
 
 /* diff_shader */
 #define MA_DIFF_LAMBERT		0
@@ -217,9 +219,8 @@ typedef struct Material {
 #define TEXCO_OSA		512
 #define TEXCO_WINDOW	1024
 #define NEED_UV			2048
-	/* optim = use simpler AA */
-#define TEXCO_OPTIM		4096
-	/* stored in vertex->accum, 1 D */
+#define TEXCO_TANGENT	4096
+	/* still stored in vertex->accum, 1 D */
 #define TEXCO_STRAND	8192
 #define TEXCO_STRESS	16384