added support for FFI library using trusted mods config

.vscode/settings.json

@@ -1,3 +1,10 @@
 {
-    "Lua.workspace.checkThirdParty": false
+    "Lua.workspace.checkThirdParty": false,
+    "Lua.diagnostics.globals": [
+        "minetest",
+        "vector",
+        "dump",
+        "player_api",
+        "modules"
+    ]
 }

README.md

@@ -1,9 +1,11 @@
 Cirno's Perfect Math Library
 ====
 ### Adapated for Minetest
+For best memory performance: have luaJIT & it's FFI library (this should be built into luaJIT), and add MTUL-CPML to your trusted list (so it can `require()` call the FFI library)
+
 Various useful bits of game math. 3D line intersections, ray casting, 2d/3d vectors, 4x4 matrices, quaternions, etc.
 
-Intended to be used with LuaJIT and LÖVE (this is the backbone of LÖVE3D).
+(originally) ntended to be used with LuaJIT and LÖVE (this is the backbone of LÖVE3D).
 
 Online documentation can be found [here](http://excessive.github.io/cpml/) or you can generate them yourself using `ldoc -c doc/config.ld -o index .`
 

init.lua

@@ -56,26 +56,68 @@ local files = {
 	"bound3",
 }
 
-modules = minetest.get_modpath("mtul_math_cpml").."/modules/"
-local old_require = require
-
-local len = #modules
-
+--initialize some variables
+local modpath = minetest.get_modpath("mtul_math_cpml")
 local loaded_modules = {}
-function require(path)
-  if loaded_modules[path] then return loaded_modules[path] end
-  local ending = string.gsub(path:sub(len+1), "%.", "/")..".lua"
-  --[[if ending[1] ~= "/" then
-    ending = "/"..ending
-  end]]
-  path = modules..ending
-  loaded_modules[path] = dofile(path)
-  return loaded_modules[path]
+local insecure = minetest.request_insecure_environment()
+local old_require = require
+local old_package_path
+--if require isn't present, allow us to load the modules through hackish means
+--there's like 100s of require calls, it'd be insane to replace them. If you're farmiliar with require, the goal should be obvious.
+--modules is the path to modules
+if not insecure then
+  --if an insecure environment cannot be loaded, then we basically change how require works temporarily, so modules (which is referenced in all CPML files on require() has to be changed)
+  modules = modpath.."/modules/"
+else
+  old_package_path = package.path
+  --get the real modpath and add it to the package.path string so we can find our modules in require()
+  insecure.package.path =  insecure.package.path .. ";"..string.gsub(modpath, "\\bin\\%.%.", "").."?.lua" --add our path
+  modules = ".modules."
 end
-for _, file in ipairs(files) do
-	mtul.math[file] = require(modules .. file)
-end
-mtul.loaded_modules.cpml = true
 
+function require(path)
+  if not insecure then
+    if loaded_modules[path] then return loaded_modules[path] end
+    local ending = string.gsub(path:sub(#modules+1), "%.", "/")..".lua"
+    --[[if ending[1] ~= "/" then
+      ending = "/"..ending
+    end]]
+    path = modules..ending
+    loaded_modules[path] = dofile(path)
+    return loaded_modules[path]
+  else
+    --if mod security is off we want to check for require() first.
+    return (old_require or insecure.require)(path)
+  end
+end
+--print(require, insecure.require)
+
+if type(jit) == "table" and jit.status() then
+  if insecure then
+    if pcall(require, "ffi") then
+      minetest.log("verbose", "MTUL-CPML: loaded JIT FFI library. Memory efficiency with FFI enabled.")
+      print("JIT")
+    else
+      minetest.log("error", "MTUL-CPML:  Failure to load JIT FFI library.")
+    end
+  else
+    minetest.log("error", "MTUL-CPML:  insecure environment denied for MTUL-CPML. Add mtul-cpml to your trusted mods for JIT FFI support (memory efficiency & speed boost)")
+  end
+else
+  minetest.log("verbose", "MTUL-CPML:  JIT not present, skipped attempt to load JIT FFI library for acceleration and memory efficiency")
+end
+
+for _, file in ipairs(files) do
+  print(modpath..modules..file)
+  mtul.math[file] = require(modules .. file)
+end
+
+--unset all the global shit we had to change for CPML to work properly.
+if old_package_path then
+  insecure.package.path = old_package_path
+end
 modules = nil
 require = old_require
+
+--tell MTUL-CORE that it's loaded.
+mtul.loaded_modules.cpml = true

modules/quat.lua

@@ -437,6 +437,13 @@ function quat.to_string(a)
 	return string.format("(%+0.3f,%+0.3f,%+0.3f,%+0.3f)", a.x, a.y, a.z, a.w)
 end
 
+
+--- Convert a quaternion to an Euler angle
+-- @tparam quat a Quaternion to convert
+-- @treturn vec3 euler angle in radians
+function quat.to_euler()
+end
+
 quat_mt.__index    = quat
 quat_mt.__tostring = quat.to_string
 

modules/simplex.lua

@@ -29,10 +29,6 @@
 -- [ MIT license: http://www.opensource.org/licenses/mit-license.php ]
 --
 
-if _G.love and _G.love.math then
-	return love.math.noise
-end
-
 -- Bail out with dummy module if FFI is missing.
 local has_ffi, ffi = pcall(require, "ffi")
 if not has_ffi then