Add raylib lua examples

examples/shaders_shapes_textures.lua

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+-------------------------------------------------------------------------------------------
+--
+--  raylib [shaders] example - Apply a shader to some shape or texture
+--
+--  NOTE: This example requires raylib OpenGL 3.3 or ES2 versions for shaders support,
+--        OpenGL 1.1 does not support shaders, recompile raylib to OpenGL 3.3 version.
+--
+--  NOTE: Shaders used in this example are #version 330 (OpenGL 3.3), to test this example
+--        on OpenGL ES 2.0 platforms (Android, Raspberry Pi, HTML5), use #version 100 shaders
+--        raylib comes with shaders ready for both versions, check raylib/shaders install folder
+--
+--  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 [shaders] example - shapes and texture shaders")
+
+local sonic = LoadTexture("resources/texture_formats/sonic.png")
+
+-- NOTE: Using GLSL 330 shader version, on OpenGL ES 2.0 use GLSL 100 shader version 
+local shader = LoadShader("resources/shaders/glsl330/base.vs", 
+                          "resources/shaders/glsl330/grayscale.fs")
+                           
+-- Shader usage is also different than models/postprocessing, shader is just activated when required
+
+SetTargetFPS(60)                        -- Set our game to run at 60 frames-per-second
+-------------------------------------------------------------------------------------------
+
+-- Main game loop
+while not WindowShouldClose() do        -- Detect window close button or ESC key
+    -- Update
+    ---------------------------------------------------------------------------------------
+    -- TODO: Update your variables here
+    ---------------------------------------------------------------------------------------
+
+    -- Draw
+    ---------------------------------------------------------------------------------------
+    BeginDrawing()
+
+        ClearBackground(RAYWHITE)
+        
+        -- Start drawing with default shader
+
+        DrawText("USING DEFAULT SHADER", 20, 40, 10, RED)
+        
+        DrawCircle(80, 120, 35, DARKBLUE)
+        DrawCircleGradient(80, 220, 60, GREEN, SKYBLUE)
+        DrawCircleLines(80, 340, 80, DARKBLUE)
+
+        
+        -- Activate our custom shader to be applied on next shapes/textures drawings
+        BeginShaderMode(shader)
+        
+            DrawText("USING CUSTOM SHADER", 190, 40, 10, RED)
+
+            DrawRectangle(250 - 60, 90, 120, 60, RED)
+            DrawRectangleGradient(250 - 90, 170, 180, 130, MAROON, GOLD)
+            DrawRectangleLines(250 - 40, 320, 80, 60, ORANGE)
+
+        -- Activate our default shader for next drawings
+        EndShaderMode()
+        
+        DrawText("USING DEFAULT SHADER", 370, 40, 10, RED)
+        
+        DrawTriangle(Vector2(430, 80),
+                     Vector2(430 - 60, 150),
+                     Vector2(430 + 60, 150), VIOLET)
+                     
+        DrawTriangleLines(Vector2(430, 160),
+                          Vector2(430 - 20, 230),
+                          Vector2(430 + 20, 230), DARKBLUE)
+
+        DrawPoly(Vector2(430, 320), 6, 80, 0, BROWN)
+        
+        -- Activate our custom shader to be applied on next shapes/textures drawings
+        BeginShaderMode(shader)
+
+            DrawTexture(sonic, 380, -10, WHITE)    -- Using custom shader
+        
+        -- Activate our default shader for next drawings
+        EndShaderMode()
+        
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+}
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+UnloadShader(shader)   -- Unload shader
+UnloadTexture(sonic)   -- Unload texture
+
+CloseWindow()          -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------