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, 12 insertions, 2 deletions

diff --git a/source/gameengine/Ketsji/BL_BlenderShader.h b/source/gameengine/Ketsji/BL_BlenderShader.h
index b758d1a9cba..da9765dafa4 100644
--- a/source/gameengine/Ketsji/BL_BlenderShader.h
+++ b/source/gameengine/Ketsji/BL_BlenderShader.h
@@ -14,7 +14,10 @@
 
 #include "RAS_IPolygonMaterial.h"
 
+#include "KX_Scene.h"
+
 struct Material;
+struct Scene;
 class BL_Material;
 
 #define BL_MAX_ATTRIB	16
@@ -27,21 +30,28 @@ class BL_BlenderShader
 {
 private:
 #ifdef BLENDER_GLSL
+	KX_Scene		*mScene;
+	struct Scene	*mBlenderScene;
+	struct Material	*mMat;
 	GPUMaterial		*mGPUMat;
 #endif
 	bool			mBound;
 	int				mLightLayer;
+	int				mBlendMode;
+
+	bool			VerifyShader();
 
 public:
-	BL_BlenderShader(struct Material *ma, int lightlayer);
+	BL_BlenderShader(KX_Scene *scene, struct Material *ma, int lightlayer);
 	virtual ~BL_BlenderShader();
 
-	const bool			Ok()const;
+	bool				Ok();
 	void				SetProg(bool enable);
 
 	int GetAttribNum();
 	void SetAttribs(class RAS_IRasterizer* ras, const BL_Material *mat);
 	void Update(const class KX_MeshSlot & ms, class RAS_IRasterizer* rasty);
+	int GetBlendMode();
 
 	bool Equals(BL_BlenderShader *blshader);
 };