Game Engine: alpha blending and sorting

=======================================

Alpha blending + sorting was revised, to fix bugs and get it
to work more predictable.

* A new per texture face "Sort" setting defines if the face
  is alpha sorted or not, instead of abusing the "ZTransp"
  setting as it did before.
* Existing files are converted to hopefully match the old
  behavior as much as possible with a version patch.
* On new meshes the Sort flag is disabled by the default, to
  avoid unexpected and hard to find slowdowns.
* Alpha sorting for faces was incredibly slow. Sorting faces
  in a mesh with 600 faces lowered the framerate from 200 to
  70 fps in my test.. the sorting there case goes about 15x
  faster now, but it is still advised to use Clip Alpha if
  possible instead of regular Alpha.
* There still various limitations in the alpha sorting code,
  I've added some comments to the code about this.

Some docs at the bottom of the page:
http://www.blender.org/development/current-projects/changes-since-246/realtime-glsl-materials/

Merged some fixes from the apricot branch, most important
change is that  tangents are now exactly the same as the rest
of Blender, instead of being computed in the game engine with a
different algorithm.

Also, the subversion was bumped to 1.

1 files changed, 6 insertions, 4 deletions

diff --git a/source/gameengine/Rasterizer/RAS_IPolygonMaterial.h b/source/gameengine/Rasterizer/RAS_IPolygonMaterial.h
index 6d90d260a23..8fc53e6b038 100644
--- a/source/gameengine/Rasterizer/RAS_IPolygonMaterial.h
+++ b/source/gameengine/Rasterizer/RAS_IPolygonMaterial.h
@@ -52,7 +52,7 @@ enum MaterialProps
 	RAS_AUTOGEN		=128,
 	RAS_NORMAL		=256,
 	RAS_DEFMULTI	=512,
-	RAS_FORCEALPHA	=1024
+	RAS_BLENDERGLSL =1024
 };
 
 /**
@@ -67,7 +67,8 @@ protected:
 	int						m_tile;
 	int						m_tilexrep,m_tileyrep;
 	int						m_drawingmode;	// tface->mode
-	bool					m_transparant;
+	int						m_transp;
+	bool					m_alpha;
 	bool					m_zsort;
 	int						m_lightlayer;
 	bool					m_bIsTriangle;
@@ -102,7 +103,8 @@ public:
 					  int tilexrep,
 					  int tileyrep,
 					  int mode,
-					  bool transparant,
+					  int transp,
+					  bool alpha,
 					  bool zsort,
 					  int lightlayer,
 					  bool bIsTriangle,
@@ -132,7 +134,7 @@ public:
 	virtual bool				Equals(const RAS_IPolyMaterial& lhs) const;
 	bool				Less(const RAS_IPolyMaterial& rhs) const;
 	int					GetLightLayer() const;
-	bool				IsTransparant() const;
+	bool				IsAlpha() const;
 	bool				IsZSort() const;
 	bool				UsesTriangles() const;
 	unsigned int		hash() const;