author | celestar |
Tue, 19 Jun 2007 07:21:01 +0000 | |
branch | gamebalance |
changeset 9913 | e79cd19772dd |
child 7587 | 353e9434475c |
permissions | -rw-r--r-- |
9913
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/* $Id$ */ |
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#ifndef BLITTER_FACTORY_HPP |
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#define BLITTER_FACTORY_HPP |
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#include "base.hpp" |
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#include <string> |
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#include <map> |
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/** |
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* The base factory, keeping track of all blitters. |
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*/ |
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class BlitterFactoryBase { |
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private: |
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char *name; |
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typedef std::map<std::string, BlitterFactoryBase *> Blitters; |
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static Blitters &GetBlitters() |
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{ |
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static Blitters &s_blitters = *new Blitters(); |
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return s_blitters; |
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} |
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static Blitter **GetActiveBlitter() |
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{ |
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static Blitter *s_blitter = NULL; |
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return &s_blitter; |
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} |
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protected: |
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/** |
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* Register a blitter internally, based on his name. |
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* @param name the name of the blitter. |
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* @note an assert() will be trigger if 2 blitters with the same name try to register. |
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*/ |
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void RegisterBlitter(const char *name) |
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{ |
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/* Don't register nameless Blitters */ |
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if (name == NULL) return; |
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this->name = strdup(name); |
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std::pair<Blitters::iterator, bool> P = GetBlitters().insert(Blitters::value_type(name, this)); |
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assert(P.second); |
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} |
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public: |
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BlitterFactoryBase() : |
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name(NULL) |
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{} |
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virtual ~BlitterFactoryBase() { if (this->name != NULL) GetBlitters().erase(this->name); free(this->name); } |
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/** |
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* Find the requested blitter and return his class. |
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* @param name the blitter to select. |
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* @post Sets the blitter so GetCurrentBlitter() returns it too. |
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*/ |
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static Blitter *SelectBlitter(const char *name) |
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{ |
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if (GetBlitters().size() == 0) return NULL; |
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Blitters::iterator it = GetBlitters().begin(); |
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for (; it != GetBlitters().end(); it++) { |
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BlitterFactoryBase *b = (*it).second; |
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if (strcasecmp(name, b->name) == 0) { |
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Blitter *newb = b->CreateInstance(); |
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*GetActiveBlitter() = newb; |
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return newb; |
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} |
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} |
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return NULL; |
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} |
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/** |
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* Get the current active blitter (always set by calling SelectBlitter). |
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*/ |
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static Blitter *GetCurrentBlitter() |
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{ |
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return *GetActiveBlitter(); |
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} |
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static char *GetBlittersInfo(char *p, const char *last) |
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{ |
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p += snprintf(p, last - p, "List of blitters:\n"); |
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Blitters::iterator it = GetBlitters().begin(); |
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for (; it != GetBlitters().end(); it++) { |
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BlitterFactoryBase *b = (*it).second; |
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p += snprintf(p, last - p, "%18s: %s\n", b->name, b->GetDescription()); |
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} |
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p += snprintf(p, last - p, "\n"); |
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return p; |
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} |
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/** |
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* Get a nice description of the blitter-class. |
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*/ |
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virtual const char *GetDescription() = 0; |
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/** |
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* Create an instance of this Blitter-class. |
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*/ |
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virtual Blitter *CreateInstance() = 0; |
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}; |
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/** |
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* A template factory, so ->GetName() works correctly. This because else some compiler will complain. |
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*/ |
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template <class T> |
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class BlitterFactory: public BlitterFactoryBase { |
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public: |
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BlitterFactory() { this->RegisterBlitter(((T *)this)->GetName()); } |
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/** |
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* Get the long, human readable, name for the Blitter-class. |
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*/ |
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const char *GetName(); |
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}; |
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#endif /* BLITTER_FACTORY_HPP */ |