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• -------------------------------------------------------------------------------
• -- Base transport medium for PUMAS
• -- Author: Valentin Niess
• -- License: GNU LGPL-3.0
• -------------------------------------------------------------------------------
• local ffi = require('ffi')
• local clib = require('pumas.clib')
• local error = require('pumas.error')
• local base = {}
• -------------------------------------------------------------------------------
• -- Cross utilities between C media and their Lua wrappers
• -------------------------------------------------------------------------------
• do
• local function addressof (ptr)
• return tonumber(ffi.cast('uintptr_t', ptr))
• end
• local media_table = setmetatable({}, {__mode = 'v'})
• function base.get (c_medium)
• return media_table[addressof(c_medium)]
• end
• function base.add (medium)
• media_table[addressof(medium._c)] = medium
• end
• local last_version
• local index = ffi.new('int [1]')
• function base.update (physics)
• if last_version == physics._version then
• return true
• end
• for _, medium in pairs(media_table) do
• if medium.material and (medium.material ~= 'Transparent') then
• local rc = clib.pumas_physics_material_index(physics._c[0],
• medium.material, index)
• if rc ~= clib.PUMAS_RETURN_SUCCESS then
• return false, medium
• else
• local m = ffi.cast('struct pumas_medium *', medium._c)
• m.material = index[0]
• end
• end
• end
• last_version = physics._version
• return true
• end
• end
• -------------------------------------------------------------------------------
• -- The base medium
• --
• -- Note: this is an incomplete metatype intended to be inherited. It provides
• -- common functionalities for media types.
• -------------------------------------------------------------------------------
• -- XXX Allow to provide an optional name?
• local BaseMedium = {}
• base.BaseMedium = BaseMedium
• function BaseMedium.__index (_, k, strtype)
• if k == '__metatype' then
• return 'Medium'
• else
• error.raise{['type'] = strtype, bad_member = k}
• end
• end
• function BaseMedium.__newindex (_, k, _, strtype)
• error.raise{['type'] = strtype, bad_member = k}
• end
• function BaseMedium.new (ctype, ctype_ptr, material)
• local c = ffi.cast(ctype_ptr, ffi.C.calloc(1, ffi.sizeof(ctype)))
• ffi.gc(c, ffi.C.free)
• local obj = {_c = c, material = material}
• base.add(obj)
• return obj
• end
• -------------------------------------------------------------------------------
• -- Return the package
• -------------------------------------------------------------------------------
• return base