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67 lines
2.6 KiB
C
67 lines
2.6 KiB
C
#pragma once
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// Comments from SDK dlls/util.h:
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//! This is the glue that hooks .MAP entity class names to our CPP classes.
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//! The _declspec forces them to be exported by name so we can do a lookup with GetProcAddress().
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//! The function is used to intialize / allocate the object for the entity.
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// Adapted from LINK_ENTITY_TO_FUNC in adminmod linkfunc.cpp.
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typedef void (*ENTITY_FN)(entvars_t *);
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// Function to perform common code of LINK_ENTITY_TO_GAME.
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void do_link_ent(ENTITY_FN *pfnEntity, int *missing, const char *entStr, entvars_t *pev);
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#define LINK_ENTITY_TO_GAME(entityName) \
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C_DLLEXPORT void entityName(entvars_t *pev); \
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void entityName(entvars_t *pev) { \
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static ENTITY_FN pfnEntity = NULL; \
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static int missing = 0; \
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do_link_ent(&pfnEntity, &missing, STRINGIZE(entityName, 0), pev); \
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}
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// For now, we have to explicitly export functions for plugin entities,
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// just as for gamedll entities. Ideally, this could be generalized in
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// some manner, so that plugins can declare and use their own entities
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// without having them explicitly supported by metamod, but I don't know
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// yet if that is actually possible.
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//
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// LINK_ENTITY_TO_PLUGIN
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// - if plugin not loaded & running, return
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// - plugin has to be set loadable=startup only, else log error, return
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// - (plugin loaded) if func missing, return
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// - (plugin loaded) if func not found, dlsym
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// - (plugin loaded) if func still not found, set missing, return
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// - (plugin loaded, func found) call func
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#define LINK_ENTITY_TO_PLUGIN(entityName, pluginName) \
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C_DLLEXPORT void entityName(entvars_t *pev); \
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void entityName(entvars_t *pev) { \
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static ENTITY_FN pfnEntity = NULL; \
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static int missing = 0; \
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const char *entStr; \
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MPlugin *findp; \
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entStr = STRINGIZE(entityName, 0); \
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if (missing) \
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return; \
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if (!pfnEntity) { \
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if (!(findp = g_plugins->find_match(pluginName))) { \
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META_ERROR("Couldn't find loaded plugin '%s' for plugin entity '%s'", pluginName, entStr); \
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missing = 1; \
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return; \
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} \
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if (findp->info && findp->info->loadable != PT_STARTUP) { \
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META_ERROR("Can't link entity '%s' for plugin '%s'; loadable != startup: %s", entStr, pluginName, findp->str_loadable()); \
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missing = 1; \
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return; \
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} \
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META_DEBUG(9, ("Looking up plugin entity '%s'", entStr)); \
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pfnEntity = (ENTITY_FN) DLSYM(findp->handle, entStr); \
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} \
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if (!pfnEntity) { \
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META_ERROR("Couldn't find plugin entity '%s' in plugin DLL '%s'", entStr, findp->file); \
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missing = 1; \
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return; \
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} \
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META_DEBUG(8, ("Linking plugin entity '%s'", entStr)); \
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(*pfnEntity)(pev); \
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}
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