Started implementing game states and intro.

main.lua

@@ -1,46 +1,120 @@
----@diagnostic disable: undefined-global
-Mousex = 0
-Mousey = 0
-Cursor = nil
-Bgm = nil
-Click = nil
-Bckg = nil
+------------------------------------------------------------------------------
+-- Imports
+------------------------------------------------------------------------------
 
+local love = require 'love'
+local game_states = require 'src.states'
+
+
+------------------------------------------------------------------------------
+-- Variables
+------------------------------------------------------------------------------
+
+Current_state = 1
+Fade_in = 0.0
+Fade_out = 1.0
+Change_state = false
+
+
+------------------------------------------------------------------------------
+-- Game methods
+------------------------------------------------------------------------------
+
+local function lerp(a, b, t)
+    -- Linear interpolation between two values a and b, by a t between 0.0 and 1.0
+    return (a * t) + (b * (1.0 - t))
+end
+
+
+------------------------------------------------------------------------------
+-- Game methods
+------------------------------------------------------------------------------
 
 function love.load()
-  Cursor = love.graphics.newImage('imgs/pointer.png')
-  Bckg = love.graphics.newImage('imgs/bckg.png')
+    game_states[Current_state]:load()
+end
 
 
-  Bgm = love.audio.newSource('bgm/dogs.wav')
-  Bgm:setLooping(true)
-  Bgm:play()
+function love.update(dt)
+    local new_state = game_states[Current_state]:update(dt)
 
-  Click = love.audio.newSource('snd/click.wav')
+    -- If the game state changed then trigger a fade out.
+    if new_state ~= Current_state and Fade_out >= 1.0 then
+        Fade_out = 0.0
+        Change_state = true
+    end
+
+    -- If there is a fade in going then update it.
+    if Fade_in < 1.0 then
+        Fade_in = Fade_in + (dt / 2)
+    end
+
+    -- If there is a fade out going then update it.
+    if Fade_out < 1.0 then
+        Fade_out = Fade_out + (dt / 2)
+    end
+
+    -- Update the game state.
+    if game_states[new_state] == nil then
+        -- If the new state doesn't exist then wait for the fade out to end and quit.
+        if Fade_out >= 1.0 then
+            game_states[Current_state]:unload(dt)
+            love.event.quit()
+        end
+    else
+        -- If the new state exists then unload it's data and set the new state.
+        if Change_state and Fade_out >= 1.0 then
+            game_states[Current_state]:unload(dt)
+            Current_state = new_state
+            game_states[Current_state]:load()
+            Change_state = false
+        end
+    end
 end
 
 
 function love.draw()
-  love.graphics.draw(Bckg, 0, 0)
-  love.graphics.draw(Cursor, Mousex , Mousey)
+    -- Reset the drawing color and clear the screen.
+    love.graphics.clear()
+
+    -- Render the current game state.
+    game_states[Current_state]:draw()
+
+    -- If there is a fade in going then render it.
+    if Fade_in < 1.0 then
+        love.graphics.setColor(0, 0, 0)
+        love.graphics.circle('fill', -320, love.graphics.getHeight() / 2, lerp(0, 400 * 2, Fade_in))
+        love.graphics.setColor()
+    end
+
+    -- If there is a fade out going then render it.
+    if Fade_out < 1.0 then
+        love.graphics.setColor(0, 0, 0)
+        love.graphics.circle('fill', -320, love.graphics.getHeight() / 2, lerp(400 * 2, 0, Fade_out))
+        love.graphics.setColor()
+    end
 end
 
 
 function love.keypressed(key)
-  if key == "escape" then
-    love.event.quit()
-  end
+    -- Send events to the active game state if there is no fade active.
+    if Fade_in >= 1.0 and Fade_out >= 1.0 then
+        game_states[Current_state]:keypressed(key)
+    end
 end
 
 
 function love.mousemoved(x, y)
-  Mousex = x
-  Mousey = y
+    -- Send events to the active game state if there is no fade active.
+    if Fade_in >= 1.0 and Fade_out >= 1.0 then
+        game_states[Current_state]:mousemoved(x, y)
+    end
 end
 
 
-function love.mousepressed(x, y, button)
-  if button == 1 then
-    Click:play()
-  end
+function love.mousepressed(x, y, btn)
+    -- Send events to the active game state if there is no fade active.
+    if Fade_in >= 1.0 and Fade_out >= 1.0 then
+        game_states[Current_state]:mousemoved(x, y, btn)
+    end
 end