forked from bartvdbraak/blender
92764260d7
disk to be reused by the next render. This is useful for rendering animations where only the camera or materials change. Note that saving the BVH to disk only to be removed for the next frame is slower if this is not the case and the meshes do actually change. For a render, it will save bvh files to the cache user directory, and remove all cache files from other renders. The files are named using a MD5 hash based on the mesh, to verify if the meshes are still the same.
131 lines
2.9 KiB
C++
131 lines
2.9 KiB
C++
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include "util_cache.h"
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#include "util_debug.h"
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#include "util_foreach.h"
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#include "util_map.h"
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#include "util_md5.h"
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#include "util_path.h"
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#include "util_types.h"
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#define BOOST_FILESYSTEM_VERSION 2
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#include <boost/filesystem.hpp>
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#include <boost/algorithm/string.hpp>
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CCL_NAMESPACE_BEGIN
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/* CacheData */
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CacheData::CacheData(const string& name_)
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{
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name = name_;
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f = NULL;
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have_filename = false;
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}
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CacheData::~CacheData()
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{
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if(f)
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fclose(f);
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}
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const string& CacheData::get_filename()
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{
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if(!have_filename) {
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MD5Hash hash;
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foreach(const CacheBuffer& buffer, buffers)
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if(buffer.size)
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hash.append((uint8_t*)buffer.data, buffer.size);
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filename = name + "_" + hash.get_hex();
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have_filename = true;
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}
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return filename;
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}
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/* Cache */
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Cache Cache::global;
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string Cache::data_filename(CacheData& key)
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{
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return path_user_get(path_join("cache", key.get_filename()));
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}
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void Cache::insert(CacheData& key, CacheData& value)
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{
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string filename = data_filename(key);
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path_create_directories(filename);
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FILE *f = fopen(filename.c_str(), "wb");
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if(!f) {
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fprintf(stderr, "Failed to open file %s for writing.\n", filename.c_str());
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return;
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}
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foreach(CacheBuffer& buffer, value.buffers) {
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if(!fwrite(&buffer.size, sizeof(buffer.size), 1, f))
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fprintf(stderr, "Failed to write to file %s.\n", filename.c_str());
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if(buffer.size)
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if(!fwrite(buffer.data, buffer.size, 1, f))
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fprintf(stderr, "Failed to write to file %s.\n", filename.c_str());
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}
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fclose(f);
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}
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bool Cache::lookup(CacheData& key, CacheData& value)
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{
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string filename = data_filename(key);
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FILE *f = fopen(filename.c_str(), "rb");
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if(!f)
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return false;
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value.name = key.name;
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value.f = f;
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return true;
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}
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void Cache::clear_except(const string& name, const set<string>& except)
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{
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string dir = path_user_get("cache");
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if(boost::filesystem::exists(dir)) {
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boost::filesystem::directory_iterator it(dir), it_end;
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for(; it != it_end; it++) {
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string filename = it->path().filename();
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if(boost::starts_with(filename, name))
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if(except.find(filename) == except.end())
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boost::filesystem::remove(it->path());
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}
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}
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}
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CCL_NAMESPACE_END
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