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-- Copyright (C) 1997-2016 Sam Lantinga <>
-- This software is provided 'as-is', without any express or implied
-- warranty. In no event will the authors be held liable for any damages
-- arising from the use of this software.
-- Permission is granted to anyone to use this software for any purpose,
-- including commercial applications, and to alter it and redistribute it
-- freely.
-- Meta-build system using premake created and maintained by
-- Benjamin Henning <>
Given a series of set configuration values from the project definitions,
this file contains a series of functions that generate valid preprocessor
definitions to enable or disable various features of the SDL2 library. These
definitions are pasted into a template SDL config header file, which is then
saved in the local directory and referenced to in generated project files.
This file depends on sdl_file.lua.
-- The line that must exist in the template file in order to properly paste
-- the generated definitions.
local searchKey = "/%* Paste generated code here %*/\n"
local configFile, templateFileContents
local insertLocation
-- This function begins config header generation given the name of the generated
-- file and the name of the template file to use.
function startGeneration(file, template)
configFile = fileopen(file, "wt")
templateFileContents = readfile(template, "rt")
insertLocation = templateFileContents:find(searchKey)
if insertLocation then
configFile:write(templateFileContents:sub(1, insertLocation - 1))
-- Adds a table of configuration values to the generated file. Each
-- configuration line is wrapped around a preprocessor definition check, so they
-- can be manually overwritten by the developer if necessary. The definition
-- pastes string versions of both the key and the value on the line, where
-- either is allowed to be empty. That means the table stores key-value pairs.
function addConfig(tbl)
-- if no insert location, don't paste anything
if not insertLocation then return end
for k,v in pairs(tbl) do
configFile:print(0, "#ifndef " .. k)
configFile:print(0, "#define " .. tostring(k) .. " " .. tostring(v))
configFile:print(0, "#endif")
-- Finishes the generation and writes the remains of the template file into the
-- generated config file.
function endGeneration()
if insertLocation then
configFile:write(templateFileContents:sub(insertLocation + #searchKey - 2))
else -- write entire file since nothing is being pasted