factory.hpp

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00001 /* $Id: factory.hpp 19094 2010-02-11 14:58:51Z yexo $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #ifndef BLITTER_FACTORY_HPP
00013 #define BLITTER_FACTORY_HPP
00014 
00015 #include "base.hpp"
00016 #include "../debug.h"
00017 #include "../string_func.h"
00018 #include "../core/string_compare_type.hpp"
00019 #include <map>
00020 
00021 #if defined(WITH_COCOA)
00022 bool QZ_CanDisplay8bpp();
00023 #endif /* defined(WITH_COCOA) */
00024 
00028 class BlitterFactoryBase {
00029 private:
00030   const char *name;
00031 
00032   typedef std::map<const char *, BlitterFactoryBase *, StringCompare> Blitters;
00033 
00034   static Blitters &GetBlitters()
00035   {
00036     static Blitters &s_blitters = *new Blitters();
00037     return s_blitters;
00038   }
00039 
00040   static Blitter **GetActiveBlitter()
00041   {
00042     static Blitter *s_blitter = NULL;
00043     return &s_blitter;
00044   }
00045 
00046 protected:
00052   void RegisterBlitter(const char *name)
00053   {
00054     /* Don't register nameless Blitters */
00055     if (name == NULL) return;
00056 
00057     this->name = strdup(name);
00058 
00059     std::pair<Blitters::iterator, bool> P = GetBlitters().insert(Blitters::value_type(name, this));
00060     assert(P.second);
00061   }
00062 
00063 public:
00064   BlitterFactoryBase() :
00065     name(NULL)
00066   {}
00067 
00068   virtual ~BlitterFactoryBase()
00069   {
00070     if (this->name == NULL) return;
00071     GetBlitters().erase(this->name);
00072     if (GetBlitters().empty()) delete &GetBlitters();
00073     free((void *)this->name);
00074   }
00075 
00081   static Blitter *SelectBlitter(const char *name)
00082   {
00083 #if defined(DEDICATED)
00084     const char *default_blitter = "null";
00085 #else
00086     const char *default_blitter = "8bpp-optimized";
00087 
00088 #if defined(WITH_COCOA)
00089     /* Some people reported lack of fullscreen support in 8 bpp mode.
00090      * While we prefer 8 bpp since it's faster, we will still have to test for support. */
00091     if (!QZ_CanDisplay8bpp()) {
00092       /* The main display can't go to 8 bpp fullscreen mode.
00093        * We will have to switch to 32 bpp by default. */
00094       default_blitter = "32bpp-anim";
00095     }
00096 #endif /* defined(WITH_COCOA) */
00097 #endif /* defined(DEDICATED) */
00098     if (GetBlitters().size() == 0) return NULL;
00099     const char *bname = (StrEmpty(name)) ? default_blitter : name;
00100 
00101     Blitters::iterator it = GetBlitters().begin();
00102     for (; it != GetBlitters().end(); it++) {
00103       BlitterFactoryBase *b = (*it).second;
00104       if (strcasecmp(bname, b->name) == 0) {
00105         Blitter *newb = b->CreateInstance();
00106         delete *GetActiveBlitter();
00107         *GetActiveBlitter() = newb;
00108 
00109         DEBUG(driver, 1, "Successfully %s blitter '%s'", StrEmpty(name) ? "probed" : "loaded", bname);
00110         return newb;
00111       }
00112     }
00113     return NULL;
00114   }
00115 
00119   static Blitter *GetCurrentBlitter()
00120   {
00121     return *GetActiveBlitter();
00122   }
00123 
00124 
00125   static char *GetBlittersInfo(char *p, const char *last)
00126   {
00127     p += seprintf(p, last, "List of blitters:\n");
00128     Blitters::iterator it = GetBlitters().begin();
00129     for (; it != GetBlitters().end(); it++) {
00130       BlitterFactoryBase *b = (*it).second;
00131       p += seprintf(p, last, "%18s: %s\n", b->name, b->GetDescription());
00132     }
00133     p += seprintf(p, last, "\n");
00134 
00135     return p;
00136   }
00137 
00141   virtual const char *GetDescription() = 0;
00142 
00146   virtual Blitter *CreateInstance() = 0;
00147 };
00148 
00152 template <class T>
00153 class BlitterFactory: public BlitterFactoryBase {
00154 public:
00155   BlitterFactory() { this->RegisterBlitter(((T *)this)->GetName()); }
00156 
00160   const char *GetName();
00161 };
00162 
00163 extern char *_ini_blitter;
00164 
00165 #endif /* BLITTER_FACTORY_HPP */

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