Panda3D

tinyTextureContext.cxx

00001 // Filename: tinyTextureContext.cxx
00002 // Created by:  drose (30Apr08)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #include "tinyTextureContext.h"
00016 #include "zgl.h"
00017 
00018 TypeHandle TinyTextureContext::_type_handle;
00019 
00020 ////////////////////////////////////////////////////////////////////
00021 //     Function: TinyTextureContext::evict_lru
00022 //       Access: Public, Virtual
00023 //  Description: Evicts the page from the LRU.  Called internally when
00024 //               the LRU determines that it is full.  May also be
00025 //               called externally when necessary to explicitly evict
00026 //               the page.
00027 //
00028 //               It is legal for this method to either evict the page
00029 //               as requested, do nothing (in which case the eviction
00030 //               will be requested again at the next epoch), or
00031 //               requeue itself on the tail of the queue (in which
00032 //               case the eviction will be requested again much
00033 //               later).
00034 ////////////////////////////////////////////////////////////////////
00035 void TinyTextureContext::
00036 evict_lru() {
00037   dequeue_lru();
00038 
00039   GLTexture *gltex = &_gltex;
00040   if (gltex->allocated_buffer != NULL) {
00041     nassertv(gltex->num_levels != 0);
00042     TinyTextureContext::get_class_type().dec_memory_usage(TypeHandle::MC_array, gltex->total_bytecount);
00043     PANDA_FREE_ARRAY(gltex->allocated_buffer);
00044     gltex->allocated_buffer = NULL;
00045     gltex->total_bytecount = 0;
00046     gltex->num_levels = 0;
00047   } else {
00048     nassertv(gltex->num_levels == 0);
00049   }
00050 
00051   update_data_size_bytes(0);
00052   mark_unloaded();
00053 }
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