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local utils 		= require("lua.utils")

local imageutils = {
	ctr 		= 0,
	images		= 	{}
}

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local function make_defaults()

	-- a single white RGBA pixel
	local white_pixel = ffi.new("uint32_t[1]", 0xFFFFFFFF)  -- 0xAARRGGBB = white

	-- describe the image
	local img_desc = ffi.new("sg_image_desc")
	img_desc.width  = 1
	img_desc.height = 1
	img_desc.pixel_format = sg.SG_PIXELFORMAT_RGBA8
	img_desc.data.subimage[0][0].ptr  = white_pixel
	img_desc.data.subimage[0][0].size = ffi.sizeof(white_pixel)

	-- create the sokol image
	imageutils.default_white_image = sg.sg_make_image(img_desc)
end

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local function loadimage(goname, imagefilepath, tid )

	if(imagefilepath == nil) then 
		pprint("[Image Load Error] imagefilepath is nil.") 
		return nil
	end

	imagefilepath = utils.cleanstring( imagefilepath )
	local img, info, data = renderer.load_image(imagefilepath, true)	
	if(info == nil) then 
		pprint("[Image Load Error] Cannot load image: "..imagefilepath) 
		return nil
	end 

	local res = {
		id 		= tid,
		img 	= img, 
		info 	= info,
		data 	= data,
	}
	imageutils.images[tid] = res

	return res
end 

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local function loadimagebuffer(goname, buf, bufsize, tid )

	if(buf == nil) then 
		pprint("[Image Load Error] imagebuffer is nil.") 
		return nil
	end

	local img, info, data = renderer.load_image_buffer(goname, buf, bufsize, true)	
	if(info == nil) then 
		pprint("[Image Load Error] Cannot load image buffer: "..goname) 
		return nil
	end 

	local res = {
		id 		= tid,
		img 	= img, 
		info 	= info,
		data 	= data,
	}
	imageutils.images[tid] = res

	return res
end 

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imageutils.make_defaults 	= make_defaults
imageutils.loadimage 		= loadimage
imageutils.loadimagebuffer 	= loadimagebuffer

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return imageutils

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