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Merge pull request #273 from coz-eduardo-hernandez/image_collections
Image collection support with texture atlases
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| ---- Texture atlas complement for the Simple Tiled Implementation | ||
| -- @copyright 2022 | ||
| -- @author Eduardo Hernández [email protected] | ||
| -- @license MIT/X11 | ||
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| local module = {} | ||
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| --- Create a texture atlas | ||
| -- @param files Array with filenames | ||
| -- @param sort If "size" will sort by size, or if "id" will sort by id | ||
| -- @param ids Array with ids of each file | ||
| -- @param pow2 If true, will force a power of 2 size | ||
| function module.Atlas( files, sort, ids, pow2 ) | ||
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| local function Node(x, y, w, h) | ||
| return {x = x, y = y, w = w, h = h} | ||
| end | ||
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| local function nextpow2( n ) | ||
| local res = 1 | ||
| while res <= n do | ||
| res = res * 2 | ||
| end | ||
| return res | ||
| end | ||
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| local function loadImgs() | ||
| local images = {} | ||
| for i = 1, #files do | ||
| images[i] = {} | ||
| --images[i].name = files[i] | ||
| if ids then images[i].id = ids[i] end | ||
| images[i].img = love.graphics.newImage( files[i] ) | ||
| images[i].w = images[i].img:getWidth() | ||
| images[i].h = images[i].img:getHeight() | ||
| images[i].area = images[i].w * images[i].h | ||
| end | ||
| if sort == "size" or sort == "id" then | ||
| table.sort( images, function( a, b ) return ( a.area > b.area ) end ) | ||
| end | ||
| return images | ||
| end | ||
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| --TODO: understand this func | ||
| local function add(root, id, w, h) | ||
| if root.left or root.right then | ||
| if root.left then | ||
| local node = add(root.left, id, w, h) | ||
| if node then return node end | ||
| end | ||
| if root.right then | ||
| local node = add(root.right, id, w, h) | ||
| if node then return node end | ||
| end | ||
| return nil | ||
| end | ||
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| if w > root.w or h > root.h then return nil end | ||
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| local _w, _h = root.w - w, root.h - h | ||
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| if _w <= _h then | ||
| root.left = Node(root.x + w, root.y, _w, h) | ||
| root.right = Node(root.x, root.y + h, root.w, _h) | ||
| else | ||
| root.left = Node(root.x, root.y + h, w, _h) | ||
| root.right = Node(root.x + w, root.y, _w, root.h) | ||
| end | ||
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| root.w = w | ||
| root.h = h | ||
| root.id = id | ||
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| return root | ||
| end | ||
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| local function unmap(root) | ||
| if not root then return {} end | ||
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| local tree = {} | ||
| if root.id then | ||
| tree[root.id] = {} | ||
| tree[root.id].x, tree[root.id].y = root.x, root.y | ||
| end | ||
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| local left = unmap(root.left) | ||
| local right = unmap(root.right) | ||
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| for k, v in pairs(left) do | ||
| tree[k] = {} | ||
| tree[k].x, tree[k].y = v.x, v.y | ||
| end | ||
| for k, v in pairs(right) do | ||
| tree[k] = {} | ||
| tree[k].x, tree[k].y = v.x, v.y | ||
| end | ||
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| return tree | ||
| end | ||
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| local function bake() | ||
| local images = loadImgs() | ||
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| local root = {} | ||
| local w, h = images[1].w, images[1].h | ||
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| if pow2 then | ||
| if w % 1 == 0 then w = nextpow2(w) end | ||
| if h % 1 == 0 then h = nextpow2(h) end | ||
| end | ||
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| repeat | ||
| local node | ||
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| root = Node(0, 0, w, h) | ||
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| for i = 1, #images do | ||
| node = add(root, i, images[i].w, images[i].h) | ||
| if not node then break end | ||
| end | ||
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| if not node then | ||
| if h <= w then | ||
| if pow2 then h = h * 2 else h = h + 1 end | ||
| else | ||
| if pow2 then w = w * 2 else w = w + 1 end | ||
| end | ||
| else | ||
| break | ||
| end | ||
| until false | ||
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| local limits = love.graphics.getSystemLimits() | ||
| if w > limits.texturesize or h > limits.texturesize then | ||
| return "Resulting texture is too large for this system" | ||
| end | ||
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| local coords = unmap(root) | ||
| local map = love.graphics.newCanvas(w, h) | ||
| love.graphics.setCanvas( map ) | ||
| -- love.graphics.clear() | ||
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| for i = 1, #images do | ||
| love.graphics.draw(images[i].img, coords[i].x, coords[i].y) | ||
| if ids then coords[i].id = images[i].id end | ||
| end | ||
| love.graphics.setCanvas() | ||
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| if sort == "ids" then | ||
| table.sort( coords, function( a, b ) return ( a.id < b.id ) end ) | ||
| end | ||
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| return { image = map, coords = coords } | ||
| end | ||
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| return bake() | ||
| end | ||
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| return module |
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