RectPack.

examples/atlas_packer/main.lua

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+package.path = package.path..";"..RL.GetBasePath().."../resources/lib/?.lua"
+
+Util = require( "utillib" )
+Vector2 = require( "vector2" )
+Rectangle = require( "rectangle" )
+
+local atlasTexture = nil
+local atlasRects = {}
+local atlasSize = Vector2:new()
+local atlasPadding = 1
+local imgPaths = {
+	"tile.png",
+	"apple.png",
+	"snake.png",
+	"wabbit_alpha.png",
+	"nPatch.png",
+	"open-folder.png",
+	"cat.png",
+	"tiles.png",
+	"monkey_tex.png",
+}
+
+local function makeAtlas()
+	local images = {}
+	local pathPrefix = RL.GetBasePath().."../resources/images/"
+
+	for i, path in ipairs( imgPaths ) do
+		images[i] = RL.LoadImage( pathPrefix..path )
+		local imgSize = Vector2:newT( RL.GetImageSize( images[i] ) )
+		atlasRects[i] = Rectangle:new( 0, 0, imgSize.x, imgSize.y )
+	end
+
+	atlasSize:setT( RL.GetScreenSize() )
+	atlasRects = RL.RectPack( atlasRects, atlasSize, atlasPadding )
+
+	local atlasImg = RL.GenImageColor( atlasSize, RL.BLANK )
+
+	for i, rect in ipairs( atlasRects ) do
+		print( "Rect", i, Rectangle:tempT( rect ) )
+		RL.ImageDraw( atlasImg, images[i],
+			{ 0, 0, rect[3], rect[4] },
+			rect,
+			RL.WHITE
+		)
+	end
+
+	RL.ImageAlphaCrop( atlasImg, 0 )
+	print( "Cropped size", Vector2:tempT( RL.GetImageSize( atlasImg ) ) )
+
+	atlasTexture = RL.LoadTextureFromImage( atlasImg )
+end
+
+function RL.init()
+	RL.SetWindowTitle( "Texture Atlas" )
+	RL.SetWindowState( RL.FLAG_VSYNC_HINT )
+
+	makeAtlas()
+end
+
+function RL.update( delta )
+end
+
+function RL.draw()
+	RL.ClearBackground( RL.DARKBLUE )
+
+	if atlasTexture then
+		RL.DrawTexture( atlasTexture, { 0, 0 }, RL.WHITE )
+	end
+end