Add atlas.lua

atlas.lua

@@ -0,0 +1,63 @@
+local Math = require "math"
+local Object = require "classic"
+
+---A spriteset laid out on a regular grid.
+local Atlas = Object:extend()
+
+---Creates a new atlas.
+---@param image love.Image
+---@param sw integer The width of each sprite.
+---@param sh integer The height of each sprite.
+function Atlas:new(image, sw, sh)
+  ---The source image of the atlas.
+  self.image = image
+
+  ---The width of each atlas's sprite.
+  self.sw = sw
+
+  ---The height of each atlas's sprite.
+  self.sh = sh
+
+  ---The width of the atlas in texels.
+  self.iw = image:getPixelWidth()
+
+  ---The height of the atlas in texels.
+  self.ih = image:getPixelHeight()
+
+  ---The width of the atlas in sprites.
+  self.w = Math.floor(self.iw / sw)
+
+  ---The height of the atlas in sprites.
+  self.h = Math.floor(self.ih / sh)
+
+  ---The total number of sprites.
+  self.num = self.w * self.h
+
+  ---A drawable mesh for each sprite.
+  self.meshes = {}
+
+  for row = 1, self.h do
+    for col = 1, self.w do
+      --UV texture coordinates
+      local l = (col - 1) * sw / self.iw
+      local t = (row - 1) * sh / self.ih
+      local r = col * sw / self.iw
+      local b = row * sh / self.ih
+
+      --Vertex data
+      local vertices = {
+        { 0,  0,  l, t },
+        { sw, 0,  r, t },
+        { 0,  sh, l, b },
+        { sw, sh, r, b }
+      }
+
+      --Create and push the mesh
+      local mesh = love.graphics.newMesh(vertices, "strip", "static")
+      mesh:setTexture(self.image)
+      self.meshes[#self.meshes + 1] = mesh
+    end
+  end
+end
+
+return Atlas

main.lua

@@ -1,3 +1,5 @@
+local Atlas = require "atlas"
+
 MultiMenu = {}
 MultiMenu.__index = MultiMenu
 
@@ -65,10 +67,17 @@ end
 
 function love.load()
   Menu = MultiMenu({ "Fight", "Use", "Pkmn", "Flee" })
+
+  local font = love.graphics.newImage("assets/small-blocky-font.png")
+  Font = Atlas(font, 8, 8)
 end
 
 function love.draw()
   Menu:draw()
+
+  for sprite = 1,#Font.meshes do
+  	love.graphics.draw(Font.meshes[sprite], sprite * 10 + 100, 100)
+  end
 end
 
 function love.keypressed(key)