mirror of
https://github.com/Relintai/sdl2_frt.git
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b72938c861
An existing hint lets apps that don't need the timer resolution changed avoid this, to save battery, etc, but this fixes several problems in timing, audio callbacks not firing fast enough, etc. Fixes Bugzilla #2944.
75 lines
2.9 KiB
Lua
Executable File
75 lines
2.9 KiB
Lua
Executable File
-- Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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--
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-- This software is provided 'as-is', without any express or implied
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-- warranty. In no event will the authors be held liable for any damages
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-- arising from the use of this software.
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--
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-- Permission is granted to anyone to use this software for any purpose,
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-- including commercial applications, and to alter it and redistribute it
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-- freely.
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--
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-- Meta-build system using premake created and maintained by
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-- Benjamin Henning <b.henning@digipen.edu>
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-- This is kept just for windows because the other platforms use different means
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-- for determining dependence or compatibility.
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--[[
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sdl_depends.lua
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This file simply contains a function for determining whether a dependency
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exists on the Windows platform, given a possible environmental variable,
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delimited search paths, and a main and/or sub-directory paths for more
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elaborate pattern matching.
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]]
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-- find_dependency_dir_windows(env, main_search_path, main_dir_path)
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-- Attempt to resolve a dependency (true or false) folder based on either an
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-- environmental variable, start search path, or both. If both are present,
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-- the environmental variable will be preferred. If neither are present, this
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-- function returns false.
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--
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-- Arguments:
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-- env The name of the environmental variable to treat as a path
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-- main_search_paths Paths to look for the main directory in
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-- main_dir_path The a path that must be contained between main_search_path and sub_dir_path
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-- sub_dir_path The path of the directories that should exist at the searched path
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function find_dependency_dir_windows(env, main_search_paths, main_dir_path, sub_dir_path)
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if not os.is("windows") then -- if not windows, then fail
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return false
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end
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if env == nil and (main_search_paths == nil or #main_search_paths == 0) then
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return false
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end
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local env_path = nil
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local main_path = nil
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if env ~= nil then env_path = os.getenv(env) end
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local search_table = { n = 0 }
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if main_search_paths ~= nil then
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for k,main_search_path in ipairs(explode(main_search_paths, ";")) do
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local directories = os.matchdirs(main_search_path .. "/**" .. main_dir_path .. "*")
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for k,v in pairs(directories) do
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table.insert(search_table, v)
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end
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end
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end
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if env_path ~= nil then table.insert(search_table, env_path) end
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local search_path = table.concat(search_table, ";")
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local result_path = os.dirpathsearch(sub_dir_path, search_path, ";")
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if result_path == nil then
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return false
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end
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local found_dir = os.isdir(result_path)
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local abs_path = path.getabsolute(result_path)
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if found_dir and env_path ~= nil then
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abs_path = abs_path:gsub("\\", "/")
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env_path = env_path:gsub("\\", "/")
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local pos = abs_path:indexOf(env_path)
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if pos ~= nil then
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abs_path = abs_path:sub(1, pos - 1) .. "$(" .. env .. ")/" .. abs_path:sub(pos + #env_path)
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end
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end
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-- we want the path in terms of '/'
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return found_dir, abs_path
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end
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