Add raylib lua examples

examples/textures_srcrec_dstrec.lua

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+-------------------------------------------------------------------------------------------
+--
+--  raylib [textures] example - Texture source and destination rectangles
+--
+--  This example has been created using raylib 1.6 (www.raylib.com)
+--  raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+--
+--  Copyright (c) 2014-2016 Ramon Santamaria (@raysan5)
+--
+-------------------------------------------------------------------------------------------
+
+-- Initialization
+-------------------------------------------------------------------------------------------
+local screenWidth = 800
+local screenHeight = 450
+
+InitWindow(screenWidth, screenHeight, "raylib [textures] examples - texture source and destination rectangles")
+
+-- NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
+local guybrush = LoadTexture("resources/guybrush.png")        -- Texture loading
+
+local frameWidth = guybrush.width/7
+local frameHeight = guybrush.height
+
+-- NOTE: Source rectangle (part of the texture to use for drawing)
+local sourceRec = Rectangle(0, 0, frameWidth, frameHeight)
+
+-- NOTE: Destination rectangle (screen rectangle where drawing part of texture)
+local destRec = Rectangle(screenWidth/2, screenHeight/2, frameWidth*2, frameHeight*2)
+
+-- NOTE: Origin of the texture (rotation/scale point), it's relative to destination rectangle size
+local origin = Vector2(frameWidth, frameHeight)
+
+local rotation = 0
+
+SetTargetFPS(60)
+-------------------------------------------------------------------------------------------
+
+-- Main game loop
+while not WindowShouldClose() do            -- Detect window close button or ESC key
+    -- Update
+    ---------------------------------------------------------------------------------------
+    rotation = rotation + 1
+    ---------------------------------------------------------------------------------------
+
+    -- Draw
+    ---------------------------------------------------------------------------------------
+    BeginDrawing()
+
+        ClearBackground(RAYWHITE)
+
+        -- NOTE: Using DrawTexturePro() we can easily rotate and scale the part of the texture we draw
+        -- sourceRec defines the part of the texture we use for drawing
+        -- destRec defines the rectangle where our texture part will fit (scaling it to fit)
+        -- origin defines the point of the texture used as reference for rotation and scaling
+        -- rotation defines the texture rotation (using origin as rotation point)
+        DrawTexturePro(guybrush, sourceRec, destRec, origin, rotation, WHITE)
+
+        DrawLine(destRec.x, 0, destRec.x, screenHeight, GRAY)
+        DrawLine(0, destRec.y, screenWidth, destRec.y, GRAY)
+
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+end
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+UnloadTexture(guybrush)       -- Texture unloading
+
+CloseWindow()                -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------