vbo: optimize buffer usage, fix some rendermodes

engine/client/gl_rsurf.c

@@ -1584,7 +1584,13 @@ void R_DrawBrushModel( cl_entity_t *e )
 	GL_SetupFogColorForSurfaces ();
 
 	if( e->curstate.rendermode == kRenderTransAdd )
+	{
 		R_AllowFog( false );
+		allow_vbo = false;
+	}
+
+	if( e->curstate.rendermode == kRenderTransColor || e->curstate.rendermode == kRenderTransTexture )
+		allow_vbo = false;
 
 	psurf = &clmodel->surfaces[clmodel->firstmodelsurface];
 	num_sorted = 0;
@@ -1959,7 +1965,7 @@ void R_GenerateVBO()
 	// prepare decal array
 	pglGenBuffersARB( 1, &vbos.decaldata->decalvbo );
 	pglBindBufferARB( GL_ARRAY_BUFFER_ARB, vbos.decaldata->decalvbo );
-	pglBufferDataARB( GL_ARRAY_BUFFER_ARB, sizeof( vbovertex_t ) * DECAL_VERTS_CUT * MAX_RENDER_DECALS, vbos.decaldata->decalarray, GL_STATIC_DRAW_ARB );
+	pglBufferDataARB( GL_ARRAY_BUFFER_ARB, sizeof( vbovertex_t ) * DECAL_VERTS_CUT * MAX_RENDER_DECALS, vbos.decaldata->decalarray, GL_DYNAMIC_DRAW_ARB );
 
 	// preallocate dlight arrays
 	vbos.dlight_index = Mem_Calloc( vbos.mempool, maxindex * sizeof( unsigned short ) * 6 );
@@ -1971,10 +1977,10 @@ void R_GenerateVBO()
 	{
 		pglGenBuffersARB( 1, &vbos.dlight_vbo );
 		pglBindBufferARB( GL_ARRAY_BUFFER_ARB, vbos.dlight_vbo );
-		pglBufferDataARB( GL_ARRAY_BUFFER_ARB, sizeof( vec2_t ) * (int)(vbos.arraylist->next?USHRT_MAX + 1:vbos.arraylist->array_len + 1) , vbos.dlight_tc, GL_DYNAMIC_DRAW_ARB );
+		pglBufferDataARB( GL_ARRAY_BUFFER_ARB, sizeof( vec2_t ) * (int)(vbos.arraylist->next?USHRT_MAX + 1:vbos.arraylist->array_len + 1) , vbos.dlight_tc, GL_STREAM_DRAW_ARB );
 		pglGenBuffersARB( 1, &vbos.decal_dlight_vbo );
 		pglBindBufferARB( GL_ARRAY_BUFFER_ARB, vbos.decal_dlight_vbo );
-		pglBufferDataARB( GL_ARRAY_BUFFER_ARB, sizeof( vbos.decal_dlight ), vbos.decal_dlight, GL_DYNAMIC_DRAW_ARB );
+		pglBufferDataARB( GL_ARRAY_BUFFER_ARB, sizeof( vbos.decal_dlight ), vbos.decal_dlight, GL_STREAM_DRAW_ARB );
 	}