GLSLVertexShader.java

/**
 * Copyright (c) 2003-2009, Xith3D Project Group all rights reserved.
 * 
 * Portions based on the Java3D interface, Copyright by Sun Microsystems.
 * Many thanks to the developers of Java3D and Sun Microsystems for their
 * innovation and design.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * Neither the name of the 'Xith3D Project Group' nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) A
 * RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE
 */
package org.xith3d.scenegraph;

/**
 * Created on Jul 7, 2006 by florian for project 'xith3d_glsl_shader_support'
 * 
 * @author Florian Hofmann (aka Goliat)
 * @author Marvin Froehlich (aka Qudus)
 */
public class GLSLVertexShader extends GLSLShader
{
    private String[] vertexAttribsMap = null;
    private int[] vertexAttribIndices = null;
    
    private static final int findIndex( int[] array, int value )
    {
        for ( int i = 0; i < array.length; i++ )
        {
            if ( array[ i ] == value )
                return ( i );
        }
        
        return ( -1 );
    }
    
    public void setVertexAttributeMapping( int index, String name )
    {
        if ( name == null )
        {
            throw new NullPointerException( "name must not be null" );
        }
        
        if ( vertexAttribIndices == null )
        {
            vertexAttribIndices = new int[]
            {
                index
            };
            vertexAttribsMap = new String[ index + 1 ];
            vertexAttribsMap[ index ] = name;
        }
        else
        {
            final int arrayIndex = findIndex( vertexAttribIndices, index );
            if ( arrayIndex >= 0 )
            {
                vertexAttribsMap[ arrayIndex ] = name;
            }
            else
            {
                if ( index >= vertexAttribsMap.length )
                {
                    String[] vertexAttribsMap2 = new String[ index + 1 ];
                    System.arraycopy( vertexAttribsMap, 0, vertexAttribsMap2, 0, vertexAttribsMap.length );
                    vertexAttribsMap = vertexAttribsMap2;
                }
                
                vertexAttribsMap[ index ] = name;
                
                int[] vertexAttribIndices2 = new int[ vertexAttribIndices.length + 1 ];
                System.arraycopy( vertexAttribIndices, 0, vertexAttribIndices2, 0, vertexAttribIndices.length );
                vertexAttribIndices = vertexAttribIndices2;
                
                vertexAttribIndices[ vertexAttribIndices.length - 1 ] = index;
            }
        }
    }
    
    public int getVertexAttributesCount()
    {
        if ( vertexAttribIndices == null )
            return ( 0 );
        
        return ( vertexAttribIndices.length  );
    }
    
    public int getNthVertexAttributeIndex( int n )
    {
        return ( vertexAttribIndices[ n ] );
    }
    
    public String getVertexAttributeMapping( int index )
    {
        return ( vertexAttribsMap[ index ] );
    }
    
    public GLSLVertexShader( String source )
    {
        super( GLSLShader.ShaderType.VERTEX, source );
    }
    
    public GLSLVertexShader()
    {
        this( null );
    }
}