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/*
* Copyright (c) 2016, Metron, Inc.
* All rights reserved.
*
* 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 Metron, Inc. 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 METRON, INC. 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) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.metsci.glimpse.gl.attribute;
import static javax.media.opengl.GL.GL_FLOAT;
import static javax.media.opengl.fixedfunc.GLPointerFunc.GL_COLOR_ARRAY;
import static javax.media.opengl.fixedfunc.GLPointerFunc.GL_NORMAL_ARRAY;
import static javax.media.opengl.fixedfunc.GLPointerFunc.GL_TEXTURE_COORD_ARRAY;
import static javax.media.opengl.fixedfunc.GLPointerFunc.GL_VERTEX_ARRAY;
import javax.media.opengl.GL2;
/**
* According to NVIDIA:
*
* "GLSL attempts to eliminate aliasing of vertex attributes but this is
* integral to NVIDIA's hardware approach and necessary for maintaining
* compatibility with existing OpenGL applications that NVIDIA customers rely
* on. NVIDIA's GLSL implementation therefore does not allow built-in vertex
* attributes to collide with a generic vertex attributes that is assigned to a
* particular vertex attribute index with glBindAttribLocation. For example, you
* should not use gl_Normal (a built-in vertex attribute) and also use
* glBindAttribLocation to bind a generic vertex attribute named "whatever"
* to vertex attribute index 2 because gl_Normal aliases to index 2."
*
* gl_Vertex 0
* gl_Normal 2
* gl_Color 3
* gl_SecondaryColor 4
* gl_FogCoord 5
* gl_MultiTexCoord0 8
* gl_MultiTexCoord1 9
* gl_MultiTexCoord2 10
* gl_MultiTexCoord3 11
* gl_MultiTexCoord4 12
* gl_MultiTexCoord5 13
* gl_MultiTexCoord6 14
* gl_MultiTexCoord7 15
*
* (source: http://developer.download.nvidia.com/opengl/glsl/glsl_release_notes.pdf)
*/
public enum GLVertexAttribute
{
ATTRIB_POSITION_1D(1), ATTRIB_POSITION_2D(2), ATTRIB_POSITION_3D(3), ATTRIB_POSITION_4D(4),
ATTRIB_COLOR_3D(3), ATTRIB_COLOR_4D(4),
ATTRIB_NORMAL(4),
ATTRIB_TEXCOORD_1D(1), ATTRIB_TEXCOORD_2D(2), ATTRIB_TEXCOORD_3D(3), ATTRIB_TEXCOORD_4D(4);
public final int length;
private GLVertexAttribute( int length )
{
this.length = length;
}
public void bind( GL2 gl, int stride, int offset )
{
toggle( gl, true, stride, offset );
}
public void unbind( GL2 gl )
{
toggle( gl, false, 0, 0 );
}
private final void toggle( GL2 gl, boolean bind, int stride, int offset )
{
switch ( this )
{
case ATTRIB_POSITION_1D:
case ATTRIB_POSITION_2D:
case ATTRIB_POSITION_3D:
case ATTRIB_POSITION_4D:
if ( bind )
{
gl.glEnableClientState( GL_VERTEX_ARRAY );
gl.glVertexPointer( length, GL_FLOAT, stride, offset );
}
else
{
gl.glDisableClientState( GL_VERTEX_ARRAY );
}
break;
case ATTRIB_COLOR_3D:
case ATTRIB_COLOR_4D:
if ( bind )
{
gl.glEnableClientState( GL_COLOR_ARRAY );
gl.glColorPointer( length, GL_FLOAT, stride, offset );
}
else
{
gl.glDisableClientState( GL_COLOR_ARRAY );
}
break;
case ATTRIB_NORMAL:
if ( bind )
{
gl.glEnableClientState( GL_NORMAL_ARRAY );
gl.glNormalPointer( GL_FLOAT, stride, offset );
}
else
{
gl.glDisableClientState( GL_NORMAL_ARRAY );
}
break;
case ATTRIB_TEXCOORD_1D:
case ATTRIB_TEXCOORD_2D:
case ATTRIB_TEXCOORD_3D:
case ATTRIB_TEXCOORD_4D:
if ( bind )
{
gl.glEnableClientState( GL_TEXTURE_COORD_ARRAY );
gl.glTexCoordPointer( length, GL_FLOAT, 0, 0 );
}
else
{
gl.glDisableClientState( GL_TEXTURE_COORD_ARRAY );
}
break;
default:
throw new UnsupportedOperationException( "Unsupported attribute." );
}
}
public static void bind( GL2 gl, int index, int length, int stride, int offset )
{
gl.glEnableVertexAttribArray( index );
gl.glVertexAttribPointer( index, length, GL_FLOAT, false, stride, offset );
}
public static void unbind( GL2 gl, int index )
{
gl.glDisableVertexAttribArray( index );
}
}
