diff --git a/demo.love b/demo.love
index e97105a..905bf5f 100644
Binary files a/demo.love and b/demo.love differ
diff --git a/examples/basic_setup_with_canvas/resolution_solution.lua b/examples/basic_setup_with_canvas/resolution_solution.lua
index bd6c998..3b05dfe 100644
--- a/examples/basic_setup_with_canvas/resolution_solution.lua
+++ b/examples/basic_setup_with_canvas/resolution_solution.lua
@@ -2,7 +2,7 @@ local rs = {
   _URL = "https://github.com/Vovkiv/resolution_solution",
   -- All functionality of this library documented here.
   _DOCUMENTATION = "https://github.com/Vovkiv/resolution_solution/blob/main/resolution_solution_documentation.pdf",
-  _VERSION = 3001,
+  _VERSION = 3002,
   -- love2d version for which this library designed.
   _LOVE = 11.5,
   _DESCRIPTION = "Yet another scaling library.",
@@ -63,17 +63,21 @@ rs.game_zone = {
 ----------------------------------------------------------------------
 
 rs.conf = function(options)
-  if type(options) ~= "table" then
-    error("configure should be table.", 2)
+  -- Sanitize.
+  if type(options) == "nil" then
+    options = {}
+  elseif type(options) ~= "table" then
+      error(".conf: 1st argument should be table or nil. You passed: " .. type(options) .. ".", 2)
   end
   
+  
   if options.game_width then
     if type(options.game_width) ~= "number" then
-      error("game_width should be number. You passed: " .. type(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be number. You passed: " .. type(options.game_width) .. ".", 2)
     end
     
     if options.game_width < 0 then
-      error("game_width should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
     end
     
     rs.game_width = options.game_width
@@ -81,11 +85,11 @@ rs.conf = function(options)
   
   if options.game_height then
     if type(options.game_height) ~= "number" then
-      error("game_height should be number. You passed: " .. type(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be number. You passed: " .. type(options.game_height) .. ".", 2)
     end
     
     if options.game_height < 0 then
-      error("game_height should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
     end
     
     rs.game_height = options.game_height
@@ -93,11 +97,11 @@ rs.conf = function(options)
   
   if options.scale_mode then
     if type(options.scale_mode) ~= "number" then
-      error("scale_mode should be number.", 2)
+      error(".conf: field \'scale_mode\' should be number. You passed: " .. type(options.scale_mode) .. ".", 2)
     end
     
     if options.scale_mode > 3 or options.scale_mode < 1 then
-      error("scale_mode can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
+      error("conf: field \'scale_mode\' can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
     end
     
     rs.scale_mode = options.scale_mode
@@ -117,8 +121,22 @@ rs.pop = function()
   love.graphics.pop()
 end
 
-rs.resize = function()
-  local window_width, window_height = love.graphics.getWidth(), love.graphics.getHeight()
+rs.resize = function(window_width, window_height)
+  -- Sanitize.
+  -- Window width.
+  if type(window_width) == "nil" then
+    window_width = love.graphics.getWidth()
+  elseif type(window_width) ~= "number" then
+    error(".resize: 1st argument should be nil or number. You passed: " .. type(window_width) .. ".")
+  end
+  
+  -- Window height.
+  if type(window_height) == "nil" then
+    window_height = love.graphics.getHeight()
+  elseif type(window_height) ~= "number" then
+    error(".resize: 2nd argument should be nil or number. You passed: " .. type(window_height) .. ".")
+  end
+  
   local scale_width, scale_height = 0, 0
   local x_offset, y_offset = 0, 0
   local game_width, game_height = rs.game_width, rs.game_height
@@ -175,11 +193,11 @@ rs.debug_info = function(debug_x, debug_y)
   
   -- Do sanity check for input arguments.
   if type(debug_x) ~= "number" then
-    error(".debugFunc: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
+    error(".debug_info: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
   end
 
   if type(debug_y) ~= "number" then
-    error(".debugFunc: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
+    error(".debug_info: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
   end
 
   -- Save color that was used before debug function.
diff --git a/examples/basic_setup_with_scissor/resolution_solution.lua b/examples/basic_setup_with_scissor/resolution_solution.lua
index bd6c998..3b05dfe 100644
--- a/examples/basic_setup_with_scissor/resolution_solution.lua
+++ b/examples/basic_setup_with_scissor/resolution_solution.lua
@@ -2,7 +2,7 @@ local rs = {
   _URL = "https://github.com/Vovkiv/resolution_solution",
   -- All functionality of this library documented here.
   _DOCUMENTATION = "https://github.com/Vovkiv/resolution_solution/blob/main/resolution_solution_documentation.pdf",
-  _VERSION = 3001,
+  _VERSION = 3002,
   -- love2d version for which this library designed.
   _LOVE = 11.5,
   _DESCRIPTION = "Yet another scaling library.",
@@ -63,17 +63,21 @@ rs.game_zone = {
 ----------------------------------------------------------------------
 
 rs.conf = function(options)
-  if type(options) ~= "table" then
-    error("configure should be table.", 2)
+  -- Sanitize.
+  if type(options) == "nil" then
+    options = {}
+  elseif type(options) ~= "table" then
+      error(".conf: 1st argument should be table or nil. You passed: " .. type(options) .. ".", 2)
   end
   
+  
   if options.game_width then
     if type(options.game_width) ~= "number" then
-      error("game_width should be number. You passed: " .. type(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be number. You passed: " .. type(options.game_width) .. ".", 2)
     end
     
     if options.game_width < 0 then
-      error("game_width should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
     end
     
     rs.game_width = options.game_width
@@ -81,11 +85,11 @@ rs.conf = function(options)
   
   if options.game_height then
     if type(options.game_height) ~= "number" then
-      error("game_height should be number. You passed: " .. type(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be number. You passed: " .. type(options.game_height) .. ".", 2)
     end
     
     if options.game_height < 0 then
-      error("game_height should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
     end
     
     rs.game_height = options.game_height
@@ -93,11 +97,11 @@ rs.conf = function(options)
   
   if options.scale_mode then
     if type(options.scale_mode) ~= "number" then
-      error("scale_mode should be number.", 2)
+      error(".conf: field \'scale_mode\' should be number. You passed: " .. type(options.scale_mode) .. ".", 2)
     end
     
     if options.scale_mode > 3 or options.scale_mode < 1 then
-      error("scale_mode can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
+      error("conf: field \'scale_mode\' can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
     end
     
     rs.scale_mode = options.scale_mode
@@ -117,8 +121,22 @@ rs.pop = function()
   love.graphics.pop()
 end
 
-rs.resize = function()
-  local window_width, window_height = love.graphics.getWidth(), love.graphics.getHeight()
+rs.resize = function(window_width, window_height)
+  -- Sanitize.
+  -- Window width.
+  if type(window_width) == "nil" then
+    window_width = love.graphics.getWidth()
+  elseif type(window_width) ~= "number" then
+    error(".resize: 1st argument should be nil or number. You passed: " .. type(window_width) .. ".")
+  end
+  
+  -- Window height.
+  if type(window_height) == "nil" then
+    window_height = love.graphics.getHeight()
+  elseif type(window_height) ~= "number" then
+    error(".resize: 2nd argument should be nil or number. You passed: " .. type(window_height) .. ".")
+  end
+  
   local scale_width, scale_height = 0, 0
   local x_offset, y_offset = 0, 0
   local game_width, game_height = rs.game_width, rs.game_height
@@ -175,11 +193,11 @@ rs.debug_info = function(debug_x, debug_y)
   
   -- Do sanity check for input arguments.
   if type(debug_x) ~= "number" then
-    error(".debugFunc: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
+    error(".debug_info: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
   end
 
   if type(debug_y) ~= "number" then
-    error(".debugFunc: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
+    error(".debug_info: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
   end
 
   -- Save color that was used before debug function.
diff --git a/examples/check_if_cursor_inside_game_zone/resolution_solution.lua b/examples/check_if_cursor_inside_game_zone/resolution_solution.lua
index bd6c998..3b05dfe 100644
--- a/examples/check_if_cursor_inside_game_zone/resolution_solution.lua
+++ b/examples/check_if_cursor_inside_game_zone/resolution_solution.lua
@@ -2,7 +2,7 @@ local rs = {
   _URL = "https://github.com/Vovkiv/resolution_solution",
   -- All functionality of this library documented here.
   _DOCUMENTATION = "https://github.com/Vovkiv/resolution_solution/blob/main/resolution_solution_documentation.pdf",
-  _VERSION = 3001,
+  _VERSION = 3002,
   -- love2d version for which this library designed.
   _LOVE = 11.5,
   _DESCRIPTION = "Yet another scaling library.",
@@ -63,17 +63,21 @@ rs.game_zone = {
 ----------------------------------------------------------------------
 
 rs.conf = function(options)
-  if type(options) ~= "table" then
-    error("configure should be table.", 2)
+  -- Sanitize.
+  if type(options) == "nil" then
+    options = {}
+  elseif type(options) ~= "table" then
+      error(".conf: 1st argument should be table or nil. You passed: " .. type(options) .. ".", 2)
   end
   
+  
   if options.game_width then
     if type(options.game_width) ~= "number" then
-      error("game_width should be number. You passed: " .. type(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be number. You passed: " .. type(options.game_width) .. ".", 2)
     end
     
     if options.game_width < 0 then
-      error("game_width should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
     end
     
     rs.game_width = options.game_width
@@ -81,11 +85,11 @@ rs.conf = function(options)
   
   if options.game_height then
     if type(options.game_height) ~= "number" then
-      error("game_height should be number. You passed: " .. type(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be number. You passed: " .. type(options.game_height) .. ".", 2)
     end
     
     if options.game_height < 0 then
-      error("game_height should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
     end
     
     rs.game_height = options.game_height
@@ -93,11 +97,11 @@ rs.conf = function(options)
   
   if options.scale_mode then
     if type(options.scale_mode) ~= "number" then
-      error("scale_mode should be number.", 2)
+      error(".conf: field \'scale_mode\' should be number. You passed: " .. type(options.scale_mode) .. ".", 2)
     end
     
     if options.scale_mode > 3 or options.scale_mode < 1 then
-      error("scale_mode can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
+      error("conf: field \'scale_mode\' can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
     end
     
     rs.scale_mode = options.scale_mode
@@ -117,8 +121,22 @@ rs.pop = function()
   love.graphics.pop()
 end
 
-rs.resize = function()
-  local window_width, window_height = love.graphics.getWidth(), love.graphics.getHeight()
+rs.resize = function(window_width, window_height)
+  -- Sanitize.
+  -- Window width.
+  if type(window_width) == "nil" then
+    window_width = love.graphics.getWidth()
+  elseif type(window_width) ~= "number" then
+    error(".resize: 1st argument should be nil or number. You passed: " .. type(window_width) .. ".")
+  end
+  
+  -- Window height.
+  if type(window_height) == "nil" then
+    window_height = love.graphics.getHeight()
+  elseif type(window_height) ~= "number" then
+    error(".resize: 2nd argument should be nil or number. You passed: " .. type(window_height) .. ".")
+  end
+  
   local scale_width, scale_height = 0, 0
   local x_offset, y_offset = 0, 0
   local game_width, game_height = rs.game_width, rs.game_height
@@ -175,11 +193,11 @@ rs.debug_info = function(debug_x, debug_y)
   
   -- Do sanity check for input arguments.
   if type(debug_x) ~= "number" then
-    error(".debugFunc: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
+    error(".debug_info: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
   end
 
   if type(debug_y) ~= "number" then
-    error(".debugFunc: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
+    error(".debug_info: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
   end
 
   -- Save color that was used before debug function.
diff --git a/examples/crispy_ui/resolution_solution.lua b/examples/crispy_ui/resolution_solution.lua
index bd6c998..3b05dfe 100644
--- a/examples/crispy_ui/resolution_solution.lua
+++ b/examples/crispy_ui/resolution_solution.lua
@@ -2,7 +2,7 @@ local rs = {
   _URL = "https://github.com/Vovkiv/resolution_solution",
   -- All functionality of this library documented here.
   _DOCUMENTATION = "https://github.com/Vovkiv/resolution_solution/blob/main/resolution_solution_documentation.pdf",
-  _VERSION = 3001,
+  _VERSION = 3002,
   -- love2d version for which this library designed.
   _LOVE = 11.5,
   _DESCRIPTION = "Yet another scaling library.",
@@ -63,17 +63,21 @@ rs.game_zone = {
 ----------------------------------------------------------------------
 
 rs.conf = function(options)
-  if type(options) ~= "table" then
-    error("configure should be table.", 2)
+  -- Sanitize.
+  if type(options) == "nil" then
+    options = {}
+  elseif type(options) ~= "table" then
+      error(".conf: 1st argument should be table or nil. You passed: " .. type(options) .. ".", 2)
   end
   
+  
   if options.game_width then
     if type(options.game_width) ~= "number" then
-      error("game_width should be number. You passed: " .. type(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be number. You passed: " .. type(options.game_width) .. ".", 2)
     end
     
     if options.game_width < 0 then
-      error("game_width should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
     end
     
     rs.game_width = options.game_width
@@ -81,11 +85,11 @@ rs.conf = function(options)
   
   if options.game_height then
     if type(options.game_height) ~= "number" then
-      error("game_height should be number. You passed: " .. type(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be number. You passed: " .. type(options.game_height) .. ".", 2)
     end
     
     if options.game_height < 0 then
-      error("game_height should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
     end
     
     rs.game_height = options.game_height
@@ -93,11 +97,11 @@ rs.conf = function(options)
   
   if options.scale_mode then
     if type(options.scale_mode) ~= "number" then
-      error("scale_mode should be number.", 2)
+      error(".conf: field \'scale_mode\' should be number. You passed: " .. type(options.scale_mode) .. ".", 2)
     end
     
     if options.scale_mode > 3 or options.scale_mode < 1 then
-      error("scale_mode can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
+      error("conf: field \'scale_mode\' can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
     end
     
     rs.scale_mode = options.scale_mode
@@ -117,8 +121,22 @@ rs.pop = function()
   love.graphics.pop()
 end
 
-rs.resize = function()
-  local window_width, window_height = love.graphics.getWidth(), love.graphics.getHeight()
+rs.resize = function(window_width, window_height)
+  -- Sanitize.
+  -- Window width.
+  if type(window_width) == "nil" then
+    window_width = love.graphics.getWidth()
+  elseif type(window_width) ~= "number" then
+    error(".resize: 1st argument should be nil or number. You passed: " .. type(window_width) .. ".")
+  end
+  
+  -- Window height.
+  if type(window_height) == "nil" then
+    window_height = love.graphics.getHeight()
+  elseif type(window_height) ~= "number" then
+    error(".resize: 2nd argument should be nil or number. You passed: " .. type(window_height) .. ".")
+  end
+  
   local scale_width, scale_height = 0, 0
   local x_offset, y_offset = 0, 0
   local game_width, game_height = rs.game_width, rs.game_height
@@ -175,11 +193,11 @@ rs.debug_info = function(debug_x, debug_y)
   
   -- Do sanity check for input arguments.
   if type(debug_x) ~= "number" then
-    error(".debugFunc: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
+    error(".debug_info: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
   end
 
   if type(debug_y) ~= "number" then
-    error(".debugFunc: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
+    error(".debug_info: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
   end
 
   -- Save color that was used before debug function.
diff --git a/examples/cursor_that_never_leaves_game_zone/resolution_solution.lua b/examples/cursor_that_never_leaves_game_zone/resolution_solution.lua
index bd6c998..3b05dfe 100644
--- a/examples/cursor_that_never_leaves_game_zone/resolution_solution.lua
+++ b/examples/cursor_that_never_leaves_game_zone/resolution_solution.lua
@@ -2,7 +2,7 @@ local rs = {
   _URL = "https://github.com/Vovkiv/resolution_solution",
   -- All functionality of this library documented here.
   _DOCUMENTATION = "https://github.com/Vovkiv/resolution_solution/blob/main/resolution_solution_documentation.pdf",
-  _VERSION = 3001,
+  _VERSION = 3002,
   -- love2d version for which this library designed.
   _LOVE = 11.5,
   _DESCRIPTION = "Yet another scaling library.",
@@ -63,17 +63,21 @@ rs.game_zone = {
 ----------------------------------------------------------------------
 
 rs.conf = function(options)
-  if type(options) ~= "table" then
-    error("configure should be table.", 2)
+  -- Sanitize.
+  if type(options) == "nil" then
+    options = {}
+  elseif type(options) ~= "table" then
+      error(".conf: 1st argument should be table or nil. You passed: " .. type(options) .. ".", 2)
   end
   
+  
   if options.game_width then
     if type(options.game_width) ~= "number" then
-      error("game_width should be number. You passed: " .. type(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be number. You passed: " .. type(options.game_width) .. ".", 2)
     end
     
     if options.game_width < 0 then
-      error("game_width should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
     end
     
     rs.game_width = options.game_width
@@ -81,11 +85,11 @@ rs.conf = function(options)
   
   if options.game_height then
     if type(options.game_height) ~= "number" then
-      error("game_height should be number. You passed: " .. type(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be number. You passed: " .. type(options.game_height) .. ".", 2)
     end
     
     if options.game_height < 0 then
-      error("game_height should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
     end
     
     rs.game_height = options.game_height
@@ -93,11 +97,11 @@ rs.conf = function(options)
   
   if options.scale_mode then
     if type(options.scale_mode) ~= "number" then
-      error("scale_mode should be number.", 2)
+      error(".conf: field \'scale_mode\' should be number. You passed: " .. type(options.scale_mode) .. ".", 2)
     end
     
     if options.scale_mode > 3 or options.scale_mode < 1 then
-      error("scale_mode can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
+      error("conf: field \'scale_mode\' can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
     end
     
     rs.scale_mode = options.scale_mode
@@ -117,8 +121,22 @@ rs.pop = function()
   love.graphics.pop()
 end
 
-rs.resize = function()
-  local window_width, window_height = love.graphics.getWidth(), love.graphics.getHeight()
+rs.resize = function(window_width, window_height)
+  -- Sanitize.
+  -- Window width.
+  if type(window_width) == "nil" then
+    window_width = love.graphics.getWidth()
+  elseif type(window_width) ~= "number" then
+    error(".resize: 1st argument should be nil or number. You passed: " .. type(window_width) .. ".")
+  end
+  
+  -- Window height.
+  if type(window_height) == "nil" then
+    window_height = love.graphics.getHeight()
+  elseif type(window_height) ~= "number" then
+    error(".resize: 2nd argument should be nil or number. You passed: " .. type(window_height) .. ".")
+  end
+  
   local scale_width, scale_height = 0, 0
   local x_offset, y_offset = 0, 0
   local game_width, game_height = rs.game_width, rs.game_height
@@ -175,11 +193,11 @@ rs.debug_info = function(debug_x, debug_y)
   
   -- Do sanity check for input arguments.
   if type(debug_x) ~= "number" then
-    error(".debugFunc: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
+    error(".debug_info: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
   end
 
   if type(debug_y) ~= "number" then
-    error(".debugFunc: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
+    error(".debug_info: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
   end
 
   -- Save color that was used before debug function.
diff --git a/examples/custom_black_bars/resolution_solution.lua b/examples/custom_black_bars/resolution_solution.lua
index bd6c998..3b05dfe 100644
--- a/examples/custom_black_bars/resolution_solution.lua
+++ b/examples/custom_black_bars/resolution_solution.lua
@@ -2,7 +2,7 @@ local rs = {
   _URL = "https://github.com/Vovkiv/resolution_solution",
   -- All functionality of this library documented here.
   _DOCUMENTATION = "https://github.com/Vovkiv/resolution_solution/blob/main/resolution_solution_documentation.pdf",
-  _VERSION = 3001,
+  _VERSION = 3002,
   -- love2d version for which this library designed.
   _LOVE = 11.5,
   _DESCRIPTION = "Yet another scaling library.",
@@ -63,17 +63,21 @@ rs.game_zone = {
 ----------------------------------------------------------------------
 
 rs.conf = function(options)
-  if type(options) ~= "table" then
-    error("configure should be table.", 2)
+  -- Sanitize.
+  if type(options) == "nil" then
+    options = {}
+  elseif type(options) ~= "table" then
+      error(".conf: 1st argument should be table or nil. You passed: " .. type(options) .. ".", 2)
   end
   
+  
   if options.game_width then
     if type(options.game_width) ~= "number" then
-      error("game_width should be number. You passed: " .. type(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be number. You passed: " .. type(options.game_width) .. ".", 2)
     end
     
     if options.game_width < 0 then
-      error("game_width should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
     end
     
     rs.game_width = options.game_width
@@ -81,11 +85,11 @@ rs.conf = function(options)
   
   if options.game_height then
     if type(options.game_height) ~= "number" then
-      error("game_height should be number. You passed: " .. type(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be number. You passed: " .. type(options.game_height) .. ".", 2)
     end
     
     if options.game_height < 0 then
-      error("game_height should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
     end
     
     rs.game_height = options.game_height
@@ -93,11 +97,11 @@ rs.conf = function(options)
   
   if options.scale_mode then
     if type(options.scale_mode) ~= "number" then
-      error("scale_mode should be number.", 2)
+      error(".conf: field \'scale_mode\' should be number. You passed: " .. type(options.scale_mode) .. ".", 2)
     end
     
     if options.scale_mode > 3 or options.scale_mode < 1 then
-      error("scale_mode can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
+      error("conf: field \'scale_mode\' can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
     end
     
     rs.scale_mode = options.scale_mode
@@ -117,8 +121,22 @@ rs.pop = function()
   love.graphics.pop()
 end
 
-rs.resize = function()
-  local window_width, window_height = love.graphics.getWidth(), love.graphics.getHeight()
+rs.resize = function(window_width, window_height)
+  -- Sanitize.
+  -- Window width.
+  if type(window_width) == "nil" then
+    window_width = love.graphics.getWidth()
+  elseif type(window_width) ~= "number" then
+    error(".resize: 1st argument should be nil or number. You passed: " .. type(window_width) .. ".")
+  end
+  
+  -- Window height.
+  if type(window_height) == "nil" then
+    window_height = love.graphics.getHeight()
+  elseif type(window_height) ~= "number" then
+    error(".resize: 2nd argument should be nil or number. You passed: " .. type(window_height) .. ".")
+  end
+  
   local scale_width, scale_height = 0, 0
   local x_offset, y_offset = 0, 0
   local game_width, game_height = rs.game_width, rs.game_height
@@ -175,11 +193,11 @@ rs.debug_info = function(debug_x, debug_y)
   
   -- Do sanity check for input arguments.
   if type(debug_x) ~= "number" then
-    error(".debugFunc: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
+    error(".debug_info: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
   end
 
   if type(debug_y) ~= "number" then
-    error(".debugFunc: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
+    error(".debug_info: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
   end
 
   -- Save color that was used before debug function.
diff --git a/examples/gamera/resolution_solution.lua b/examples/gamera/resolution_solution.lua
index bd6c998..3b05dfe 100644
--- a/examples/gamera/resolution_solution.lua
+++ b/examples/gamera/resolution_solution.lua
@@ -2,7 +2,7 @@ local rs = {
   _URL = "https://github.com/Vovkiv/resolution_solution",
   -- All functionality of this library documented here.
   _DOCUMENTATION = "https://github.com/Vovkiv/resolution_solution/blob/main/resolution_solution_documentation.pdf",
-  _VERSION = 3001,
+  _VERSION = 3002,
   -- love2d version for which this library designed.
   _LOVE = 11.5,
   _DESCRIPTION = "Yet another scaling library.",
@@ -63,17 +63,21 @@ rs.game_zone = {
 ----------------------------------------------------------------------
 
 rs.conf = function(options)
-  if type(options) ~= "table" then
-    error("configure should be table.", 2)
+  -- Sanitize.
+  if type(options) == "nil" then
+    options = {}
+  elseif type(options) ~= "table" then
+      error(".conf: 1st argument should be table or nil. You passed: " .. type(options) .. ".", 2)
   end
   
+  
   if options.game_width then
     if type(options.game_width) ~= "number" then
-      error("game_width should be number. You passed: " .. type(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be number. You passed: " .. type(options.game_width) .. ".", 2)
     end
     
     if options.game_width < 0 then
-      error("game_width should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
     end
     
     rs.game_width = options.game_width
@@ -81,11 +85,11 @@ rs.conf = function(options)
   
   if options.game_height then
     if type(options.game_height) ~= "number" then
-      error("game_height should be number. You passed: " .. type(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be number. You passed: " .. type(options.game_height) .. ".", 2)
     end
     
     if options.game_height < 0 then
-      error("game_height should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
     end
     
     rs.game_height = options.game_height
@@ -93,11 +97,11 @@ rs.conf = function(options)
   
   if options.scale_mode then
     if type(options.scale_mode) ~= "number" then
-      error("scale_mode should be number.", 2)
+      error(".conf: field \'scale_mode\' should be number. You passed: " .. type(options.scale_mode) .. ".", 2)
     end
     
     if options.scale_mode > 3 or options.scale_mode < 1 then
-      error("scale_mode can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
+      error("conf: field \'scale_mode\' can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
     end
     
     rs.scale_mode = options.scale_mode
@@ -117,8 +121,22 @@ rs.pop = function()
   love.graphics.pop()
 end
 
-rs.resize = function()
-  local window_width, window_height = love.graphics.getWidth(), love.graphics.getHeight()
+rs.resize = function(window_width, window_height)
+  -- Sanitize.
+  -- Window width.
+  if type(window_width) == "nil" then
+    window_width = love.graphics.getWidth()
+  elseif type(window_width) ~= "number" then
+    error(".resize: 1st argument should be nil or number. You passed: " .. type(window_width) .. ".")
+  end
+  
+  -- Window height.
+  if type(window_height) == "nil" then
+    window_height = love.graphics.getHeight()
+  elseif type(window_height) ~= "number" then
+    error(".resize: 2nd argument should be nil or number. You passed: " .. type(window_height) .. ".")
+  end
+  
   local scale_width, scale_height = 0, 0
   local x_offset, y_offset = 0, 0
   local game_width, game_height = rs.game_width, rs.game_height
@@ -175,11 +193,11 @@ rs.debug_info = function(debug_x, debug_y)
   
   -- Do sanity check for input arguments.
   if type(debug_x) ~= "number" then
-    error(".debugFunc: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
+    error(".debug_info: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
   end
 
   if type(debug_y) ~= "number" then
-    error(".debugFunc: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
+    error(".debug_info: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
   end
 
   -- Save color that was used before debug function.
diff --git a/examples/hump_camera/resolution_solution.lua b/examples/hump_camera/resolution_solution.lua
index bd6c998..3b05dfe 100644
--- a/examples/hump_camera/resolution_solution.lua
+++ b/examples/hump_camera/resolution_solution.lua
@@ -2,7 +2,7 @@ local rs = {
   _URL = "https://github.com/Vovkiv/resolution_solution",
   -- All functionality of this library documented here.
   _DOCUMENTATION = "https://github.com/Vovkiv/resolution_solution/blob/main/resolution_solution_documentation.pdf",
-  _VERSION = 3001,
+  _VERSION = 3002,
   -- love2d version for which this library designed.
   _LOVE = 11.5,
   _DESCRIPTION = "Yet another scaling library.",
@@ -63,17 +63,21 @@ rs.game_zone = {
 ----------------------------------------------------------------------
 
 rs.conf = function(options)
-  if type(options) ~= "table" then
-    error("configure should be table.", 2)
+  -- Sanitize.
+  if type(options) == "nil" then
+    options = {}
+  elseif type(options) ~= "table" then
+      error(".conf: 1st argument should be table or nil. You passed: " .. type(options) .. ".", 2)
   end
   
+  
   if options.game_width then
     if type(options.game_width) ~= "number" then
-      error("game_width should be number. You passed: " .. type(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be number. You passed: " .. type(options.game_width) .. ".", 2)
     end
     
     if options.game_width < 0 then
-      error("game_width should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
     end
     
     rs.game_width = options.game_width
@@ -81,11 +85,11 @@ rs.conf = function(options)
   
   if options.game_height then
     if type(options.game_height) ~= "number" then
-      error("game_height should be number. You passed: " .. type(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be number. You passed: " .. type(options.game_height) .. ".", 2)
     end
     
     if options.game_height < 0 then
-      error("game_height should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
     end
     
     rs.game_height = options.game_height
@@ -93,11 +97,11 @@ rs.conf = function(options)
   
   if options.scale_mode then
     if type(options.scale_mode) ~= "number" then
-      error("scale_mode should be number.", 2)
+      error(".conf: field \'scale_mode\' should be number. You passed: " .. type(options.scale_mode) .. ".", 2)
     end
     
     if options.scale_mode > 3 or options.scale_mode < 1 then
-      error("scale_mode can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
+      error("conf: field \'scale_mode\' can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
     end
     
     rs.scale_mode = options.scale_mode
@@ -117,8 +121,22 @@ rs.pop = function()
   love.graphics.pop()
 end
 
-rs.resize = function()
-  local window_width, window_height = love.graphics.getWidth(), love.graphics.getHeight()
+rs.resize = function(window_width, window_height)
+  -- Sanitize.
+  -- Window width.
+  if type(window_width) == "nil" then
+    window_width = love.graphics.getWidth()
+  elseif type(window_width) ~= "number" then
+    error(".resize: 1st argument should be nil or number. You passed: " .. type(window_width) .. ".")
+  end
+  
+  -- Window height.
+  if type(window_height) == "nil" then
+    window_height = love.graphics.getHeight()
+  elseif type(window_height) ~= "number" then
+    error(".resize: 2nd argument should be nil or number. You passed: " .. type(window_height) .. ".")
+  end
+  
   local scale_width, scale_height = 0, 0
   local x_offset, y_offset = 0, 0
   local game_width, game_height = rs.game_width, rs.game_height
@@ -175,11 +193,11 @@ rs.debug_info = function(debug_x, debug_y)
   
   -- Do sanity check for input arguments.
   if type(debug_x) ~= "number" then
-    error(".debugFunc: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
+    error(".debug_info: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
   end
 
   if type(debug_y) ~= "number" then
-    error(".debugFunc: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
+    error(".debug_info: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
   end
 
   -- Save color that was used before debug function.
diff --git a/history/v3002.lua b/history/v3002.lua
new file mode 100644
index 0000000..3b05dfe
--- /dev/null
+++ b/history/v3002.lua
@@ -0,0 +1,347 @@
+local rs = {
+  _URL = "https://github.com/Vovkiv/resolution_solution",
+  -- All functionality of this library documented here.
+  _DOCUMENTATION = "https://github.com/Vovkiv/resolution_solution/blob/main/resolution_solution_documentation.pdf",
+  _VERSION = 3002,
+  -- love2d version for which this library designed.
+  _LOVE = 11.5,
+  _DESCRIPTION = "Yet another scaling library.",
+  _NAME = "Resolution Solution",
+  _LICENSE = "The Unlicense",
+  _LICENSE_TEXT = [[
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>
+]]
+}
+
+----------------------------------------------------------------------
+--                        Library variables                         --
+----------------------------------------------------------------------
+
+-- 1 Aspect Scaling.
+-- 2 Stretched Scaling.
+-- 3 Pixel Perfect Scaling.
+rs.scale_mode = 1
+
+rs.scale_width, rs.scale_height = 0, 0
+
+rs.game_width, rs.game_height = 800, 600
+
+rs.x_offset, rs.y_offset = 0, 0
+
+rs.game_zone = {
+  x = 0,
+  y = 0,
+  w = 0,
+  h = 0
+}
+
+----------------------------------------------------------------------
+--                        Essential functions                       --
+----------------------------------------------------------------------
+
+rs.conf = function(options)
+  -- Sanitize.
+  if type(options) == "nil" then
+    options = {}
+  elseif type(options) ~= "table" then
+      error(".conf: 1st argument should be table or nil. You passed: " .. type(options) .. ".", 2)
+  end
+  
+  
+  if options.game_width then
+    if type(options.game_width) ~= "number" then
+      error(".conf: field \'game_width\' should be number. You passed: " .. type(options.game_width) .. ".", 2)
+    end
+    
+    if options.game_width < 0 then
+      error(".conf: field \'game_width\' should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
+    end
+    
+    rs.game_width = options.game_width
+  end
+  
+  if options.game_height then
+    if type(options.game_height) ~= "number" then
+      error(".conf: \'game_height\' should be number. You passed: " .. type(options.game_height) .. ".", 2)
+    end
+    
+    if options.game_height < 0 then
+      error(".conf: \'game_height\' should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
+    end
+    
+    rs.game_height = options.game_height
+  end
+  
+  if options.scale_mode then
+    if type(options.scale_mode) ~= "number" then
+      error(".conf: field \'scale_mode\' should be number. You passed: " .. type(options.scale_mode) .. ".", 2)
+    end
+    
+    if options.scale_mode > 3 or options.scale_mode < 1 then
+      error("conf: field \'scale_mode\' can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
+    end
+    
+    rs.scale_mode = options.scale_mode
+  end
+  
+  rs.resize()
+end
+
+rs.push = function()
+  love.graphics.push()
+  love.graphics.origin()
+  love.graphics.translate(rs.x_offset, rs.y_offset)
+  love.graphics.scale(rs.scale_width, rs.scale_height)
+end
+
+rs.pop = function()
+  love.graphics.pop()
+end
+
+rs.resize = function(window_width, window_height)
+  -- Sanitize.
+  -- Window width.
+  if type(window_width) == "nil" then
+    window_width = love.graphics.getWidth()
+  elseif type(window_width) ~= "number" then
+    error(".resize: 1st argument should be nil or number. You passed: " .. type(window_width) .. ".")
+  end
+  
+  -- Window height.
+  if type(window_height) == "nil" then
+    window_height = love.graphics.getHeight()
+  elseif type(window_height) ~= "number" then
+    error(".resize: 2nd argument should be nil or number. You passed: " .. type(window_height) .. ".")
+  end
+  
+  local scale_width, scale_height = 0, 0
+  local x_offset, y_offset = 0, 0
+  local game_width, game_height = rs.game_width, rs.game_height
+  local scale_mode = rs.scale_mode
+  
+  -- If we in stretch scaling mode.
+  if scale_mode == 2 then
+    -- We only need to update width and height scale.
+    scale_width = window_width / game_width
+    scale_height = window_height / game_height
+  
+  -- Other scaling modes.
+  else
+  -- Other scaling methods need to determine scale based on window and game aspects.
+    local scale = math.min(window_width / game_width, window_height / game_height)
+
+    -- Pixel Perfect Scaling.
+    if scale_mode == 3 then
+      -- We will floor to nearest int number.
+      -- And we fallback to scale 1, if game size is less then window, because when scale == 0, there nothing to see.
+      scale = math.max(math.floor(scale), 1)
+    end
+
+    x_offset, y_offset = (window_width - (scale * game_width)) / 2, (window_height - (scale * game_height)) / 2
+    scale_width, scale_height = scale, scale
+  end
+  
+  -- Write new values to library --
+  
+  rs.x_offset, rs.y_offset = x_offset, y_offset
+  rs.scale_width, rs.scale_height = scale_width, scale_height
+  
+  rs.game_zone.x = x_offset
+  rs.game_zone.y = y_offset
+  rs.game_zone.w = window_width - (x_offset * 2)
+  rs.game_zone.h = window_height - (y_offset * 2)
+  
+  rs.resize_callback()
+end
+
+----------------------------------------------------------------------
+--                        Helper functions                          --
+----------------------------------------------------------------------
+
+rs.resize_callback = function() end
+
+rs.debug_info = function(debug_x, debug_y)
+  -- Set width and height for debug "window".
+  local debug_width, debug_height = 215, 120
+
+  -- Default position is top-left corner of window.
+  debug_x = debug_x or 0
+  debug_y = debug_y or 0
+  
+  -- Do sanity check for input arguments.
+  if type(debug_x) ~= "number" then
+    error(".debug_info: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
+  end
+
+  if type(debug_y) ~= "number" then
+    error(".debug_info: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
+  end
+
+  -- Save color that was used before debug function.
+  local r, g, b, a = love.graphics.getColor()
+
+  -- Save font that was used before debug function.
+  local old_font = love.graphics.getFont()
+
+  -- Draw background rectangle for text.
+  love.graphics.setColor(0, 0, 0, 0.5)
+  
+  -- Place debug info on screen according to user input.
+  love.graphics.rectangle("fill", debug_x, debug_y, debug_width, debug_height)
+
+  -- Set color.
+  love.graphics.setColor(1, 1, 1, 1)
+
+  -- Set font.
+  love.graphics.setFont(love.graphics.newFont(12))
+
+  -- Print data.
+  love.graphics.printf(
+    rs._NAME .. " v." .. tostring(rs._VERSION) .. "\n" ..
+    "game_width: " .. tostring(rs.game_width) .. "\n" ..
+    "game_height: " .. tostring(rs.game_height) .. "\n" ..
+    "scale_width: " .. tostring(rs.scale_width) .. "\n" ..
+    "scale_height: " .. tostring(rs.scale_height) .. "\n" ..
+    "scale_mode: " .. tostring(rs.scale_mode) .. "\n" ..
+    "x_offset: " .. tostring(rs.x_offset) .. "\n" ..
+    "y_offset: " .. tostring(rs.y_offset) .. "\n",
+    debug_x, debug_y, debug_width)
+
+  -- Return previous color.
+  love.graphics.setColor(r, g, b, a)
+  
+  -- Return previous font.
+  love.graphics.setFont(old_font)
+end
+
+rs.get_game_zone = function()
+  local game_zone = rs.game_zone
+  return game_zone.x, game_zone.y, game_zone.w, game_zone.h
+end
+
+rs.get_game_size = function()
+  return rs.game_width, rs.game_height
+end
+
+rs.is_it_inside = function(it_x, it_y)
+  -- Input sanitizing.
+  if type(it_x) ~= "number" then
+    error(".is_it_inside: Argument #1 should be number. You passed: " .. type(it_x) .. ".", 2)
+  end
+  
+  if type(it_y) ~= "number" then
+    error(".is_it_inside: Argument #2 should be number. You passed: " .. type(it_y) .. ".", 2)
+  end
+  
+  -- If we in Stretch Scaling mode - then we always inside.
+  if rs.scaleMode == 2 then
+    return true
+  end
+  
+  local x, y, w, h = rs.game_zone.x, rs.game_zone.y, rs.game_zone.w, rs.game_zone.h
+
+  -- Check if it inside game zone.
+  if it_x    >= x                 and -- left
+     it_y    >= y                 and -- top
+     it_x    <= x + w             and -- right
+     it_y    <= y + h            then -- bottom
+      -- It inside game zone.
+     return true
+  end
+
+  -- It outside of game zone.
+  return false
+end
+
+rs.get_both_scales = function()
+  return rs.scale_width, rs.scale_height
+end
+
+rs.to_game = function(x, y)
+  -- User passed only x.
+  if type(x) == "number" and type(y) == "nil" then
+    return (x - rs.x_offset) / rs.scale_width
+
+  -- User passed only y.
+  elseif type(x) == "nil" and type(y) == "number" then
+    return (y - rs.y_offset) / rs.scale_height
+
+  -- User passed both X and Y.
+  elseif type(x) == "number" and type(y) == "number" then
+    return (x - rs.x_offset) / rs.scale_width, (y - rs.y_offset) / rs.scale_height
+
+  -- User passed wrong arguments.
+  else
+    error(".to_game: At least 1 argument should be number. You passed: " .. type(x) .. " and " .. type(y), 2)
+  end
+end
+
+rs.to_window = function(x, y)
+  -- User passed only X.
+  if type(x) == "number" and type(y) == "nil" then
+    return (x * rs.scale_width) + rs.x_offset
+  
+  -- User passed only Y.
+  elseif type(x) == "nil" and type(y) == "number" then
+    return (y * rs.scale_height) + rs.y_offset
+  
+  -- User passed both X and Y.
+  elseif type(x) == "number" and type(y) == "number" then
+    return (x * rs.scale_width) + rs.x_offset, (y * rs.scale_height) + rs.y_offset
+
+  -- User passed wrong arguments.
+  else
+    error(".to_window: At least 1 argument should be number. You passed: " .. type(x) .. " and " .. type(y), 2)
+  end
+end
+
+----------------------------------------------------------------------
+--                        love wrappers                             --
+----------------------------------------------------------------------
+
+rs.setMode = function(width, height, flags)
+  -- Wrapper for love.window.setMode()
+
+  local okay, errorMessage = pcall(love.window.setMode, width, height, flags)
+  if not okay then
+    error(".setMode: Error: " .. errorMessage, 2)
+  end
+  
+  rs.resize()
+end
+
+rs.updateMode = function(width, height, flags)
+  -- Wrapper for love.window.updateMode()
+  
+  local okay, errorMessage = pcall(love.window.updateMode, width, height, flags)
+  if not okay then
+    error(".updateMode: Error: " .. errorMessage, 2)
+  end
+  
+  rs.resize()
+end
+
+return rs
diff --git a/history/v3002.odt b/history/v3002.odt
new file mode 100644
index 0000000..7136c96
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diff --git a/history/v3002.pdf b/history/v3002.pdf
new file mode 100644
index 0000000..5069bda
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diff --git a/resolution_solution.lua b/resolution_solution.lua
index bd6c998..3b05dfe 100644
--- a/resolution_solution.lua
+++ b/resolution_solution.lua
@@ -2,7 +2,7 @@ local rs = {
   _URL = "https://github.com/Vovkiv/resolution_solution",
   -- All functionality of this library documented here.
   _DOCUMENTATION = "https://github.com/Vovkiv/resolution_solution/blob/main/resolution_solution_documentation.pdf",
-  _VERSION = 3001,
+  _VERSION = 3002,
   -- love2d version for which this library designed.
   _LOVE = 11.5,
   _DESCRIPTION = "Yet another scaling library.",
@@ -63,17 +63,21 @@ rs.game_zone = {
 ----------------------------------------------------------------------
 
 rs.conf = function(options)
-  if type(options) ~= "table" then
-    error("configure should be table.", 2)
+  -- Sanitize.
+  if type(options) == "nil" then
+    options = {}
+  elseif type(options) ~= "table" then
+      error(".conf: 1st argument should be table or nil. You passed: " .. type(options) .. ".", 2)
   end
   
+  
   if options.game_width then
     if type(options.game_width) ~= "number" then
-      error("game_width should be number. You passed: " .. type(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be number. You passed: " .. type(options.game_width) .. ".", 2)
     end
     
     if options.game_width < 0 then
-      error("game_width should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
+      error(".conf: field \'game_width\' should be 0 or more. You passed: " .. tostring(options.game_width) .. ".", 2)
     end
     
     rs.game_width = options.game_width
@@ -81,11 +85,11 @@ rs.conf = function(options)
   
   if options.game_height then
     if type(options.game_height) ~= "number" then
-      error("game_height should be number. You passed: " .. type(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be number. You passed: " .. type(options.game_height) .. ".", 2)
     end
     
     if options.game_height < 0 then
-      error("game_height should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
+      error(".conf: \'game_height\' should be 0 or more. You passed: " .. tostring(options.game_height) .. ".", 2)
     end
     
     rs.game_height = options.game_height
@@ -93,11 +97,11 @@ rs.conf = function(options)
   
   if options.scale_mode then
     if type(options.scale_mode) ~= "number" then
-      error("scale_mode should be number.", 2)
+      error(".conf: field \'scale_mode\' should be number. You passed: " .. type(options.scale_mode) .. ".", 2)
     end
     
     if options.scale_mode > 3 or options.scale_mode < 1 then
-      error("scale_mode can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
+      error("conf: field \'scale_mode\' can be only 1, 2 and 3. You passed: " .. tostring(options.scale_mode) .. ".")
     end
     
     rs.scale_mode = options.scale_mode
@@ -117,8 +121,22 @@ rs.pop = function()
   love.graphics.pop()
 end
 
-rs.resize = function()
-  local window_width, window_height = love.graphics.getWidth(), love.graphics.getHeight()
+rs.resize = function(window_width, window_height)
+  -- Sanitize.
+  -- Window width.
+  if type(window_width) == "nil" then
+    window_width = love.graphics.getWidth()
+  elseif type(window_width) ~= "number" then
+    error(".resize: 1st argument should be nil or number. You passed: " .. type(window_width) .. ".")
+  end
+  
+  -- Window height.
+  if type(window_height) == "nil" then
+    window_height = love.graphics.getHeight()
+  elseif type(window_height) ~= "number" then
+    error(".resize: 2nd argument should be nil or number. You passed: " .. type(window_height) .. ".")
+  end
+  
   local scale_width, scale_height = 0, 0
   local x_offset, y_offset = 0, 0
   local game_width, game_height = rs.game_width, rs.game_height
@@ -175,11 +193,11 @@ rs.debug_info = function(debug_x, debug_y)
   
   -- Do sanity check for input arguments.
   if type(debug_x) ~= "number" then
-    error(".debugFunc: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
+    error(".debug_info: 1st argument should be number or nil. You passed: " .. type(debug_x) .. ".", 2)
   end
 
   if type(debug_y) ~= "number" then
-    error(".debugFunc: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
+    error(".debug_info: 2nd argument should be number or nil. You passed: " .. type(debug_y) .. ".", 2)
   end
 
   -- Save color that was used before debug function.
diff --git a/resolution_solution_documentation.odt b/resolution_solution_documentation.odt
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diff --git a/resolution_solution_documentation.pdf b/resolution_solution_documentation.pdf
index 93cc473..5069bda 100644
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