Cost of wrapping ffi functions
- From: Tim Caswell <tim@xxxxxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Wed, 6 Jun 2012 09:34:18 -0500
I have a general question about wrapping libraries using ffi.
I want to expose a nice lua-friendly API to my users, but use ffi under the
hood instead of C bindings.
I know that Mike said that it's bad to alias the ffi functions directly
because that will actually slow things down. For example:
local gles = ffi.load("/usr/lib/x86_64-linux-gnu/libGLESv2.so")
gles.glViewport(640, 480, screen.w, screen.h)
is better than:
local gles = ffi.load("/usr/lib/x86_64-linux-gnu/libGLESv2.so")
local glViewport = gles.glViewport
glViewport(640, 480, screen.w, screen.h)
But I want to wrap some functions that are hairy to deal with
(outargs, strings, structs -> tables, etc..) Is the best way to
accomplish this to wrap in a lua function and use the closure to the
gles object?
local function glViewport(x, y, width, height)
gles.glViewport(x, y, width, height)
end
- Tim Caswell
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