1 files changed, 252 insertions, 0 deletions
diff --git a/src/java/demos/efx/EFXFilter.java b/src/java/demos/efx/EFXFilter.java
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+++ b/src/java/demos/efx/EFXFilter.java
@@ -0,0 +1,252 @@
+package demos.efx;
+
+import net.java.games.joal.AL;
+import net.java.games.joal.ALC;
+import net.java.games.joal.ALCcontext;
+import net.java.games.joal.ALCdevice;
+import net.java.games.joal.ALFactory;
+import net.java.games.joal.util.WAVData;
+import net.java.games.joal.util.WAVLoader;
+
+/**
+ * OpenAL 1.1 EFX test class, a translation of the C++ EFXFilter demo from the
+ * OpenAL 1.1 SDK.
+ * 
+ * @author Emanuel Rabina
+ */
+public class EFXFilter {
+
+    private static ALCdevice device;
+    private static ALCcontext context;
+    private static ALC alc;
+    private static AL al;
+
+    private static String wavefile = "demos/data/Footsteps.wav";
+
+    /**
+     * Run something similar to the EFXFilter sample from the OpenAL 1.1
+     * (w/ EFX) SDK.
+     * 
+     * @param args
+     */
+    public static void main(String[] args) {
+
+        try {
+            initOpenAL();
+
+            // Requires EFX support
+            if (alc.alcIsExtensionPresent(device, "ALC_EXT_EFX")) {
+
+                // Load the sound sample to a buffer
+                WAVData wavedata = WAVLoader.loadFromStream(EFXFilter.class.getClassLoader().getResourceAsStream(wavefile));
+                int[] buffers = new int[1];
+                al.alGenBuffers(1, buffers, 0);
+                al.alBufferData(buffers[0], wavedata.format, wavedata.data, wavedata.size, wavedata.freq);
+                int buffer = buffers[0];
+
+                // Attach buffer to a source
+                int[] sources = new int[1];
+                al.alGenSources(1, sources, 0);
+                al.alSourcei(sources[0], AL.AL_BUFFER, buffer);
+                int source = sources[0];
+
+                // Play the sound through a variety of EFX filters & effects
+                playDry(source);
+                playDirectFilter(source);
+                playAuxiliaryNoFilter(source);
+                playAuxiliaryFilter(source);
+
+                // Cleanup buffer & source
+                al.alSourcei(source, AL.AL_BUFFER, 0);
+                al.alDeleteSources(1, new int[]{ source }, 0);
+                al.alDeleteBuffers(1, new int[]{ buffer }, 0);
+            }
+            else {
+                System.out.println("EFX not supported.");
+            }
+
+            shutdownOpenAL();
+            System.exit(0);
+        }
+        catch (Exception ex) {
+            System.out.println(ex.getMessage());
+            ex.printStackTrace();
+            System.exit(1);
+        }
+    }
+
+    /**
+     * Set up an OpenAL context and make it current on this thread.
+     */
+    private static void initOpenAL() {
+
+        alc = ALFactory.getALC();
+        device = alc.alcOpenDevice(null);
+        context = alc.alcCreateContext(device, null);
+        alc.alcMakeContextCurrent(context);
+
+        al = ALFactory.getAL();
+    }
+
+    /**
+     * Release & destroy the OpenAL context and close the device.
+     */
+    private static void shutdownOpenAL() {
+
+        alc.alcMakeContextCurrent(null);
+        alc.alcDestroyContext(context);
+        alc.alcCloseDevice(device);
+
+        alc = null;
+        al = null;
+    }
+
+    /**
+     * Plays the source without any filters.
+     * 
+     * @param source Source ID.
+     */
+    private static void playDry(int source) {
+
+        System.out.println("Source played dry");
+        play(source);
+    }
+
+    /**
+     * Plays the source with a low-pass filter.
+     * 
+     * @param source Source ID.
+     */
+    private static void playDirectFilter(int source) {
+
+        System.out.println("Source played through a direct lowpass filter");
+
+        // Attach a lowpass filter to the source
+        int filter = createFilter(AL.AL_FILTER_LOWPASS, 1f, 0.5f);
+        al.alSourcei(source, AL.AL_DIRECT_FILTER, filter);
+
+        play(source);
+
+        // Cleanup
+        al.alSourcei(source, AL.AL_DIRECT_FILTER, AL.AL_FILTER_NULL);
+        deleteFilter(filter);
+    }
+
+    /**
+     * Plays the source through an auxiliary reverb with no filter.
+     * 
+     * @param source Source ID.
+     */
+    private static void playAuxiliaryNoFilter(int source) {
+
+        System.out.println("Source played through an auxiliary reverb without filtering");
+
+        // Create auxiliary effect slots & effects
+        int[] effectslots = new int[1];
+        al.alGenAuxiliaryEffectSlots(1, effectslots, 0);
+        int[] effects = new int[1];
+        al.alGenEffects(1, effects, 0);
+
+        // Configure the effect to be a reverb, load it to the effect slot
+        al.alEffecti(effects[0], AL.AL_EFFECT_TYPE, AL.AL_EFFECT_REVERB);
+        al.alAuxiliaryEffectSloti(effectslots[0], AL.AL_EFFECTSLOT_EFFECT, effects[0]);
+
+        // Enable Send 0 from the Source to the Auxiliary Effect Slot without filtering
+        al.alSource3i(source, AL.AL_AUXILIARY_SEND_FILTER, effectslots[0], 0, AL.AL_FILTER_NULL);
+
+        play(source);
+
+        // Cleanup
+        al.alSource3i(source, AL.AL_AUXILIARY_SEND_FILTER, AL.AL_EFFECTSLOT_NULL, 0, AL.AL_FILTER_NULL);
+        al.alDeleteAuxiliaryEffectSlots(1, effectslots, 0);
+        al.alDeleteEffects(1, effects, 0);
+    }
+
+    /**
+     * Plays the source through an auxiliary reverb with a low-pass filter.
+     * 
+     * @param source SourceID.
+     */
+    private static void playAuxiliaryFilter(int source) {
+
+        System.out.println("Source played through an auxiliary reverb with lowpass filter");
+
+        // Create a lowpass filter, attach it to a reverb effect
+        int filter = createFilter(AL.AL_FILTER_LOWPASS, 1f, 0.5f);
+
+        int[] effectslots = new int[1];
+        al.alGenAuxiliaryEffectSlots(1, effectslots, 0);
+        int[] effects = new int[1];
+        al.alGenEffects(1, effects, 0);
+        al.alEffecti(effects[0], AL.AL_EFFECT_TYPE, AL.AL_EFFECT_REVERB);
+        al.alAuxiliaryEffectSloti(effectslots[0], AL.AL_EFFECTSLOT_EFFECT, effects[0]);
+
+        // Enable Send 0 from the Source to the Auxiliary Effect Slot with filtering
+        al.alSource3i(source, AL.AL_AUXILIARY_SEND_FILTER, effectslots[0], 0, filter);
+
+        play(source);
+
+        // Cleanup
+        al.alSource3i(source, AL.AL_AUXILIARY_SEND_FILTER, AL.AL_EFFECTSLOT_NULL, 0, AL.AL_FILTER_NULL);
+        al.alDeleteAuxiliaryEffectSlots(1, effectslots, 0);
+        al.alDeleteEffects(1, effects, 0);
+    }
+
+    /**
+     * Plays the source, returning once the source has been completed.
+     * 
+     * @param source Source ID.
+     */
+    private static void play(int source) {
+
+        al.alSourcePlay(source);
+
+        while (true) {
+            int[] state = new int[1];
+            al.alGetSourcei(source, AL.AL_SOURCE_STATE, state, 0);
+
+            if (state[0] == AL.AL_PLAYING) {
+                try {
+                    Thread.sleep(50);
+                }
+                catch (InterruptedException iex) {
+                    throw new RuntimeException(iex.getMessage(), iex);
+                }
+            }
+            else {
+                break;
+            }
+        }
+    }
+
+    /**
+     * Creates a new OpenAL EFX filter per the given specs.
+     * 
+     * @param filtertype Type of filter to create.  One of {@link AL#AL_FILTER_LOWPASS},
+     * 					 or {@link AL#AL_FILTER_HIGHPASS}.
+     * @param gain		 Filter gain.
+     * @param gainlimit	 Filter frequency (upper/lower) limit.
+     * @return Filter ID.
+     */
+    private static int createFilter(int filtertype, float gain, float gainlimit) {
+
+        int filters[] = new int[1];
+        al.alGenFilters(1, filters, 0);
+
+        al.alFilteri(filters[0], AL.AL_FILTER_TYPE, filtertype);
+        al.alFilterf(filters[0], filtertype, gain);
+        al.alFilterf(filters[0], filtertype, gainlimit);
+
+        return filters[0];
+    }
+
+    /**
+     * Deletes the given OpenAL EFX filter.
+     * 
+     * @param filter Filter ID.
+     */
+    private static void deleteFilter(int filter) {
+
+        al.alDeleteFilters(1, new int[]{ filter }, 0);
+    }
+}