Add raylib lua examples

examples/audio_raw_stream.lua

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+-------------------------------------------------------------------------------------------
+--
+--  raylib [audio] example - Raw audio streaming
+--
+--  NOTE: This example requires OpenAL Soft library installed
+--
+--  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_SAMPLES = 20000
+DEG2RAD = math.pi/180.0
+
+-- Initialization
+-------------------------------------------------------------------------------------------
+local screenWidth = 800
+local screenHeight = 450
+
+InitWindow(screenWidth, screenHeight, "raylib [audio] example - raw audio streaming")
+
+InitAudioDevice()              -- Initialize audio device
+
+-- Init raw audio stream (sample rate: 22050, sample size: 32bit-float, channels: 1-mono)
+local stream = InitAudioStream(22050, 32, 1)
+
+-- Fill audio stream with some samples (sine wave)
+local data = {}
+
+for i = 1, MAX_SAMPLES do
+    data[i] = math.sin(((2*math.pi*i)/2)*DEG2RAD)
+end
+
+-- NOTE: The generated MAX_SAMPLES do not fit to close a perfect loop
+-- for that reason, there is a clip everytime audio stream is looped
+
+PlayAudioStream(stream)
+
+local totalSamples = MAX_SAMPLES
+local samplesLeft = totalSamples
+
+local position = Vector2(0, 0)
+
+SetTargetFPS(30)               -- Set our game to run at 30 frames-per-second
+-------------------------------------------------------------------------------------------
+
+-- Main game loop
+while not WindowShouldClose() do    -- Detect window close button or ESC key
+    -- Update
+    ---------------------------------------------------------------------------------------
+    
+    -- Refill audio stream if required
+    if (IsAudioBufferProcessed(stream)) then
+        local numSamples = 0
+        
+        if (samplesLeft >= 4096) then numSamples = 4096
+        else numSamples = samplesLeft end
+
+        UpdateAudioStream(stream, data + (totalSamples - samplesLeft), numSamples)
+        
+        samplesLeft = samplesLeft - numSamples
+        
+        -- Reset samples feeding (loop audio)
+        if (samplesLeft <= 0) then samplesLeft = totalSamples end
+    end
+    ---------------------------------------------------------------------------------------
+
+    -- Draw
+    ---------------------------------------------------------------------------------------
+    BeginDrawing()
+
+        ClearBackground(RAYWHITE)
+
+        DrawText("SINE WAVE SHOULD BE PLAYING!", 240, 140, 20, LIGHTGRAY)
+        
+        -- NOTE: Draw a part of the sine wave (only screen width)
+        for i = 1, GetScreenWidth() do
+            position.x = (i - 1)
+            position.y = 250 + 50*data[i]
+            
+            DrawPixelV(position, RED)
+        end
+
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+end
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+CloseAudioStream(stream)   -- Close raw audio stream and delete buffers from RAM
+
+CloseAudioDevice()         -- Close audio device (music streaming is automatically stopped)
+
+CloseWindow()              -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------