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1 import std/dynlib
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2 import std/strutils
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3 import std/logging
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4
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5 var
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6 steam_api: LibHandle
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7 steam_is_loaded = false
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8
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9 when defined(linux):
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10 proc dlerror(): cstring {.stdcall, importc.}
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11 steam_api = "libsteam_api.so".loadLib()
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12 if steam_api == nil:
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13 echo dlerror()
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14 elif defined(windows):
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15 steam_api = "steam_api".loadLib()
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16 # TODO: maybe should get some error reporting on windows too?
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17
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18
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19 # required to store reference, when calling certain APIs
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20 type
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21 SteamUserStatsRef = ptr object
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22 var userStats: SteamUserStatsRef
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23
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24 # load function pointers for steam API
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25 var
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26 Shutdown*: proc() {.stdcall.}
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27 Init: proc(msg: ptr array[1024, char]): cint {.stdcall.}
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28 SteamUserStats: proc(): SteamUserStatsRef {.stdcall.}
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29 RequestCurrentStats: proc(self: SteamUserStatsRef): bool {.stdcall.} # needs to be called before the achievment-stuff
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30 ClearAchievement: proc(self: SteamUserStatsRef, pchName: cstring): bool {.stdcall.}
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31 SetAchievement: proc(self: SteamUserStatsRef, pchName: cstring): bool {.stdcall.}
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32 StoreStats: proc(self: SteamUserStatsRef): bool {.stdcall.} # needs to be called in order for achievments to be saved
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33 # dynlib-helper function
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34 proc loadFunc[T](nimFunc: var T, dllFuncName: string) =
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35 nimFunc = cast[T](steam_api.checkedSymAddr(dllFuncName))
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36 if steam_api != nil:
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37 loadFunc(Init, "SteamAPI_InitFlat")
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38 loadFunc(Shutdown, "SteamAPI_Shutdown")
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39 loadFunc(SteamUserStats, "SteamAPI_SteamUserStats_v012")
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40 loadFunc(RequestCurrentStats, "SteamAPI_ISteamUserStats_RequestCurrentStats")
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41 loadFunc(ClearAchievement, "SteamAPI_ISteamUserStats_ClearAchievement")
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42 loadFunc(SetAchievement, "SteamAPI_ISteamUserStats_SetAchievement")
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43 loadFunc(StoreStats, "SteamAPI_ISteamUserStats_StoreStats")
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44
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45
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46 # nice wrappers for steam API
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47
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48 proc SteamRequestCurrentStats*(): bool =
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49 RequestCurrentStats(userStats)
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50
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51 proc SteamClearAchievement*(name: string): bool =
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52 userStats.ClearAchievement(name.cstring)
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53
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54 proc SteamSetAchievement*(name: string): bool =
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55 userStats.SetAchievement(name.cstring)
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56
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57 proc SteamStoreStats*(): bool =
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58 userStats.StoreStats()
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59
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60 proc SteamShutdown*() =
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61 Shutdown()
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62
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63
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64 # helper funcs
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65 proc SteamAvailable*(): bool =
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66 steam_api != nil and steam_is_loaded
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67
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68 # first function that should be called
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69 proc TrySteamInit*() =
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70 if steam_api != nil and not steam_is_loaded:
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71 var msg: array[1024, char]
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72 let success = Init(addr msg) == 0
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73 warn join(@msg, "")
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74 if success:
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75 userStats = SteamUserStats()
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76 steam_is_loaded = SteamRequestCurrentStats()
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