scene-creator/resource_loader.lua at master · irondavy/scene-creator · GitHub

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local resource_loader = {}

-- Load functions retain a 'holder' to which a strong reference must be held while the resource is in use

local defaultImage

if love.graphics then
    defaultImage = love.graphics.newImage(CHECKERBOARD_IMAGE_URL)
    defaultImage:setFilter("nearest", "nearest")
end

local imageHolders = {
    linear = setmetatable({}, {__mode = "v"}),
    nearest = setmetatable({}, {__mode = "v"})
}

function resource_loader.loadImage(url, filter)
    filter = filter or "linear"
    local holder = imageHolders[filter][url]
    if not holder then
        holder = {}
        imageHolders[filter][url] = holder
        holder.image = defaultImage
        if url ~= "" then
            network.async(
                function()
                    holder.image = love.graphics.newImage(url)
                    holder.image:setFilter(filter, filter)
                    holder.loaded = true
                end
            )
        end
    end
    return holder
end

local fontHolders = setmetatable({}, {__mode = "v"})

function resource_loader.loadFont(url, size)
    local key = size .. "|" .. url
    local holder = fontHolders[key]
    if not holder then
        holder = {}
        fontHolders[key] = holder
        holder.font = love.graphics.newFont(size)
        if url ~= "" then
            network.async(
                function()
                    holder.font = love.graphics.newFont(url, size)
                end
            )
        end
    end
    return holder
end

return resource_loader