screen_fx.lua

--- This module provides various screen-based effect routines.

--
-- Permission is hereby granted, free of charge, to any person obtaining
-- a copy of this software and associated documentation files (the
-- "Software"), to deal in the Software without restriction, including
-- without limitation the rights to use, copy, modify, merge, publish,
-- distribute, sublicense, and/or sell copies of the Software, and to
-- permit persons to whom the Software is furnished to do so, subject to
-- the following conditions:
--
-- The above copyright notice and this permission notice shall be
-- included in all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-- IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-- CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-- TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-- SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--
-- [ MIT license: http://www.opensource.org/licenses/mit-license.php ]
--

-- Exports --
local M = {}

-- --
local PosVarying = "v_Pos"

-- --
local PosVaryingType = "P_POSITION vec2"

-- --
local PosVaryingDecl = ("%s %s"):format(PosVaryingType, PosVarying)

-- --
local PassThroughVertexKernel = ([[
	varying %s;

	P_POSITION vec2 VertexKernel (P_POSITION vec2 pos)
	{
		v_Pos = pos;

		return pos;
	}
]]):format(PosVaryingDecl)

--- DOCME
function M.GetPassThroughVertexKernelSource ()
	return PassThroughVertexKernel
end

--- DOCME
function M.GetPosVaryingName ()
	return PosVarying
end

--- DOCME
function M.GetPosVaryingType ()
	return PosVaryingType
end

-- --
local Prelude = ([[
	varying %s;

]]):format(PosVaryingDecl)

--- DOCME
function M.GetPrelude ()
	return Prelude
end

-- Export the module.
return M