Add IMaterialRendererServices::startUseProgram/stopUseProgram

This makes it possible to set high-level shader constants (which are attached to shader programs) to be set outside
of OnSetConstants.
IShaderConstantSetCallBack::OnCreate has it set automatically now so it works the same as OnSetConstants.
D3D9 and burnings both work different, so there hadn't been a problem with those.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6469 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COpenGLDriver.cpp

@@ -3727,7 +3727,9 @@ s32 COpenGLDriver::addShaderMaterial(const c8* vertexShaderProgram,
 	r->drop();
 
 	if (callback && nr >= 0)
+	{
 		callback->OnCreate(this, userData);
+	}
 
 	return nr;
 }
@@ -3764,7 +3766,11 @@ s32 COpenGLDriver::addHighLevelShaderMaterial(
 	r->drop();
 
 	if (callback && nr >= 0)
+	{
+		r->startUseProgram();
 		callback->OnCreate(r, userData);
+		r->stopUseProgram();
+	}
 
 	return nr;
 }