Add raylib lua examples

examples/audio_module_playing.lua

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+-------------------------------------------------------------------------------------------
+--
+--   raylib [audio] example - Module playing (streaming)
+--
+--  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)
+--
+-------------------------------------------------------------------------------------------
+
+MAX_CIRCLES = 64
+
+typedef struct {        -- TODO: Find a Lua alternative: TABLES?
+    Vector2 position
+    float radius
+    float alpha
+    float speed
+    Color color
+} CircleWave
+
+-- Initialization
+-------------------------------------------------------------------------------------------
+local screenWidth = 800
+local screenHeight = 450
+
+InitWindow(screenWidth, screenHeight, "raylib [audio] example - module playing (streaming)")
+
+InitAudioDevice()              -- Initialize audio device
+
+local colors = { ORANGE, RED, GOLD, LIME, BLUE, VIOLET, BROWN, LIGHTGRAY, PINK,
+                 YELLOW, GREEN, SKYBLUE, PURPLE, BEIGE }
+
+-- Creates ome circles for visual effect
+local circles = {}
+
+for i = MAX_CIRCLES, 1, -1 do
+    circles[i].alpha = 0.0
+    circles[i].radius = GetRandomValue(10, 40)
+    circles[i].position.x = GetRandomValue(circles[i].radius, screenWidth - circles[i].radius)
+    circles[i].position.y = GetRandomValue(circles[i].radius, screenHeight - circles[i].radius)
+    circles[i].speed = (float)GetRandomValue(1, 100)/20000.0
+    circles[i].color = colors[GetRandomValue(1, 14)]
+end
+
+-- Load postprocessing bloom shader
+local shader = LoadShader("resources/shaders/glsl330/base.vs", 
+                          "resources/shaders/glsl330/bloom.fs")
+
+-- Create a RenderTexture2D to be used for render to texture
+local target = LoadRenderTexture(screenWidth, screenHeight)
+
+local xm = LoadMusicStream("resources/audio/mini1111.xm")
+
+PlayMusicStream(xm)
+
+local timePlayed = 0.0
+
+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
+    ---------------------------------------------------------------------------------------
+    for i = MAX_CIRCLES, 1, -1 do
+        circles[i].alpha += circles[i].speed
+        circles[i].radius += circles[i].speed*10.0
+        
+        if (circles[i].alpha > 1.0) then circles[i].speed = circles[i].speed*-1 end
+        
+        if (circles[i].alpha <= 0.0) then
+            circles[i].alpha = 0.0
+            circles[i].radius = GetRandomValue(10, 40)
+            circles[i].position.x = GetRandomValue(circles[i].radius, screenWidth - circles[i].radius)
+            circles[i].position.y = GetRandomValue(circles[i].radius, screenHeight - circles[i].radius)
+            circles[i].color = colors[GetRandomValue(0, 13)]
+            circles[i].speed = (float)GetRandomValue(1, 100)/20000.0
+        end
+    end
+
+    -- Get timePlayed scaled to bar dimensions
+    timePlayed = (GetMusicTimePlayed(xm)/GetMusicTimeLength(xm)*(screenWidth - 40))*2
+    
+    UpdateMusicStream(xm)        -- Update music buffer with new stream data
+    ---------------------------------------------------------------------------------------
+
+    -- Draw
+    ---------------------------------------------------------------------------------------
+    BeginDrawing()
+
+        ClearBackground(BLACK)
+        
+        BeginTextureMode(target)   -- Enable drawing to texture
+
+            for i = MAX_CIRCLES, 1, -1 do
+                DrawCircleV(circles[i].position, circles[i].radius, Fade(circles[i].color, circles[i].alpha))
+            end
+            
+        EndTextureMode()           -- End drawing to texture (now we have a texture available for next passes)
+        
+        BeginShaderMode(shader)
+
+            -- NOTE: Render texture must be y-flipped due to default OpenGL coordinates (left-bottom)
+            DrawTextureRec(target.texture, Rectangle(0, 0, target.texture.width, -target.texture.height), Vector2(0, 0), WHITE)
+            
+        EndShaderMode()
+
+        -- Draw time bar
+        DrawRectangle(20, screenHeight - 20 - 12, screenWidth - 40, 12, LIGHTGRAY)
+        DrawRectangle(20, screenHeight - 20 - 12, (int)timePlayed, 12, MAROON)
+        DrawRectangleLines(20, screenHeight - 20 - 12, screenWidth - 40, 12, WHITE)
+
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+end
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+UnloadShader(shader)           -- Unload shader
+UnloadRenderTexture(target)    -- Unload render texture
+
+UnloadMusicStream(xm)          -- Unload music stream buffers from RAM
+
+CloseAudioDevice()     -- Close audio device (music streaming is automatically stopped)
+
+CloseWindow()          -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------
+
+return 0
+}