VisClient/org/hfbk/vis/visnode/VisSound.java

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package org.hfbk.vis.visnode;

import java.net.MalformedURLException;

import org.dronus.al.ALUtil;
import org.dronus.graph.Node;
import org.lwjgl.openal.AL;
import org.lwjgl.openal.AL10;
import org.lwjgl.openal.AL11;
import org.lwjgl.opengl.GL11;
import org.lwjgl.util.WaveData;
import org.lwjgl.util.vector.Vector3f;


public class VisSound extends Sound {
        
        final int SAMPLE_STEP=150;
        short[] samples;
        
        int ringpos=0;
        final int RING_LENGTH=100;
        // a ring buffer for past sample storage
        final short[] ring=new short[RING_LENGTH];
        
        public VisSound(Node n, Vector3f pos) {
                super(n.text);
                this.position=pos;
                // 
        }

        void renderSelf() {
                super.renderSelf();
                
                GL11.glDisable(GL11.GL_TEXTURE_2D);
                GL11.glColor3f(1,1,1);
                
                
                if (samples!=null){
                        int samplepos=(int)(AL10.alGetSourcef(source,AL11.AL_SAMPLE_OFFSET)/SAMPLE_STEP);
                        
                        if (samplepos<samples.length)                           
                                ring[ringpos]=samples[samplepos];
                        else
                                ring[ringpos]=0;
                        
                        for (int i=1; i<100; i++){
                                float y;
                                
                                y=ring[(ringpos-i+RING_LENGTH)%RING_LENGTH]*.0001f;
                                 
                                float r=i/5f;
                                
                                if (Math.abs(y)>.01){
                                        GL11.glColor4f(1,1,1,  1-i/130f);
                                        GL11.glBegin(GL11.GL_LINE_LOOP);
                                                for (float a=0; a<2*Math.PI; a+=.1f)
                                                        GL11.glVertex3f((float)Math.sin(a)*r, y, (float)Math.cos(a)*r);
                                        GL11.glEnd();
                                }
                        }
                }
                ringpos++; ringpos%=RING_LENGTH;
        }

        public void trigger(boolean looping){
                if (!AL.isCreated()) return; 
                if (source==0){
                        source=ALUtil.createSource();
                        try {
                                WaveData wav=ALUtil.loadWav(wavfile);
                                buffer=ALUtil.createBuffer(wav);
                                samples=ALUtil.sample(wav,SAMPLE_STEP);
                        } catch (MalformedURLException e) {
                                e.printStackTrace();
                        }
                        AL10.alSourcei(source, AL10.AL_BUFFER, buffer);
                }
                
                super.trigger(looping);
        }
}

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