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/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
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** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
**
** NOTE: The Original Code (as defined below) has been licensed to Sun
** Microsystems, Inc. ("Sun") under the SGI Free Software License B
** (Version 1.1), shown above ("SGI License"). Pursuant to Section
** 3.2(3) of the SGI License, Sun is distributing the Covered Code to
** you under an alternative license ("Alternative License"). This
** Alternative License includes all of the provisions of the SGI License
** except that Section 2.2 and 11 are omitted. Any differences between
** the Alternative License and the SGI License are offered solely by Sun
** and not by SGI.
**
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
**
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
**
** Author: Eric Veach, July 1994
** Java Port: Pepijn Van Eeckhoudt, July 2003
** Java Port: Nathan Parker Burg, August 2003
*/
package com.sun.prism.util.tess;
/**
* TessellatorCallback interface provides methods that the user will
* override to define the callbacks for a tessellation object.
*
* @author Eric Veach, July 1994
* @author Java Port: Pepijn Van Eeckhoudt, July 2003
* @author Java Port: Nathan Parker Burg, August 2003
*/
public interface TessellatorCallback {
/**
* The begin callback method is invoked like
* {@link com.sun.prism.opengl.GL#glBegin glBegin} to indicate the start of a
* (triangle) primitive. The method takes a single argument of type int. If
* the GLU_TESS_BOUNDARY_ONLY property is set to GL_FALSE, then
* the argument is set to either GL_TRIANGLE_FAN,
* GL_TRIANGLE_STRIP, or GL_TRIANGLES. If the
* GLU_TESS_BOUNDARY_ONLY property is set to GL_TRUE, then the
* argument will be set to GL_LINE_LOOP.
*
* @param type
* Specifics the type of begin/end pair being defined. The following
* values are valid: GL_TRIANGLE_FAN, GL_TRIANGLE_STRIP,
* GL_TRIANGLES or GL_LINE_LOOP.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #end end
* @see #begin begin
*/
public void begin(int type);
/**
* The same as the {@link #begin begin} callback method except that
* it takes an additional reference argument. This reference is
* identical to the opaque reference provided when {@link
* GLU#gluTessBeginPolygon gluTessBeginPolygon} was called.
*
* @param type
* Specifics the type of begin/end pair being defined. The following
* values are valid: GL_TRIANGLE_FAN, GL_TRIANGLE_STRIP,
* GL_TRIANGLES or GL_LINE_LOOP.
* @param polygonData
* Specifics a reference to user-defined data.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #endData endData
* @see #begin begin
*/
public void beginData(int type, Object polygonData);
/**
* The edgeFlag callback method is similar to
* {@link com.sun.prism.opengl.GL#glEdgeFlag glEdgeFlag}. The method takes
* a single boolean boundaryEdge that indicates which edges lie on the
* polygon boundary. If the boundaryEdge is GL_TRUE, then each vertex
* that follows begins an edge that lies on the polygon boundary, that is,
* an edge that separates an interior region from an exterior one. If the
* boundaryEdge is GL_FALSE, then each vertex that follows begins an
* edge that lies in the polygon interior. The edge flag callback (if
* defined) is invoked before the first vertex callback.
*
* Since triangle fans and triangle strips do not support edge flags, the
* begin callback is not called with GL_TRIANGLE_FAN or
* GL_TRIANGLE_STRIP if a non-null edge flag callback is provided.
* (If the callback is initialized to null, there is no impact on
* performance). Instead, the fans and strips are converted to independent
* triangles.
*
* @param boundaryEdge
* Specifics which edges lie on the polygon boundary.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #edgeFlagData edgeFlagData
*/
public void edgeFlag(boolean boundaryEdge);
/**
* The same as the {@link #edgeFlag edgeFlage} callback method
* except that it takes an additional reference argument. This
* reference is identical to the opaque reference provided when
* {@link GLU#gluTessBeginPolygon gluTessBeginPolygon} was called.
*
* @param boundaryEdge
* Specifics which edges lie on the polygon boundary.
* @param polygonData
* Specifics a reference to user-defined data.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #edgeFlag edgeFlag
*/
public void edgeFlagData(boolean boundaryEdge, Object polygonData);
/**
* The vertex callback method is invoked between the {@link
* #begin begin} and {@link #end end} callback methods. It is
* similar to {@link com.sun.prism.opengl.GL#glVertex3f glVertex3f},
* and it defines the vertices of the triangles created by the
* tessellation process. The method takes a reference as its only
* argument. This reference is identical to the opaque reference
* provided by the user when the vertex was described (see {@link
* GLU#gluTessVertex gluTessVertex}).
*
* @param vertexData
* Specifics a reference to the vertices of the triangles created
* by the tessellation process.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #vertexData vertexData
*/
public void vertex(Object vertexData);
/**
* The same as the {@link #vertex vertex} callback method except
* that it takes an additional reference argument. This reference is
* identical to the opaque reference provided when {@link
* GLU#gluTessBeginPolygon gluTessBeginPolygon} was called.
*
* @param vertexData
* Specifics a reference to the vertices of the triangles created
* by the tessellation process.
* @param polygonData
* Specifics a reference to user-defined data.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #vertex vertex
*/
public void vertexData(Object vertexData, Object polygonData);
/**
* The end callback serves the same purpose as
* {@link com.sun.prism.opengl.GL#glEnd glEnd}. It indicates the end of a
* primitive and it takes no arguments.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #begin begin
* @see #endData endData
*/
public void end();
/**
* The same as the {@link #end end} callback method except that it
* takes an additional reference argument. This reference is
* identical to the opaque reference provided when {@link
* GLU#gluTessBeginPolygon gluTessBeginPolygon} was called.
*
* @param polygonData
* Specifics a reference to user-defined data.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #beginData beginData
* @see #end end
*/
public void endData(Object polygonData);
/**
* The combine callback method is called to create a new vertex when
* the tessellation detects an intersection, or wishes to merge features. The
* method takes four arguments: an array of three elements each of type
* double, an array of four references, an array of four elements each of
* type float, and a reference to a reference.
*
* The vertex is defined as a linear combination of up to four existing
* vertices, stored in data. The coefficients of the linear combination
* are given by weight; these weights always add up to 1. All vertex
* pointers are valid even when some of the weights are 0. coords gives
* the location of the new vertex.
*
* The user must allocate another vertex, interpolate parameters using
* data and weight, and return the new vertex pointer in
* outData. This handle is supplied during rendering callbacks. The
* user is responsible for freeing the memory some time after
* {@link GLU#gluTessEndPolygon gluTessEndPolygon} is
* called.
*
* For example, if the polygon lies in an arbitrary plane in 3-space, and a
* color is associated with each vertex, the GLU_TESS_COMBINE
* callback might look like this:
*
*
* void myCombine(double[] coords, Object[] data,
* float[] weight, Object[] outData)
* {
* MyVertex newVertex = new MyVertex();
*
* newVertex.x = coords[0];
* newVertex.y = coords[1];
* newVertex.z = coords[2];
* newVertex.r = weight[0]*data[0].r +
* weight[1]*data[1].r +
* weight[2]*data[2].r +
* weight[3]*data[3].r;
* newVertex.g = weight[0]*data[0].g +
* weight[1]*data[1].g +
* weight[2]*data[2].g +
* weight[3]*data[3].g;
* newVertex.b = weight[0]*data[0].b +
* weight[1]*data[1].b +
* weight[2]*data[2].b +
* weight[3]*data[3].b;
* newVertex.a = weight[0]*data[0].a +
* weight[1]*data[1].a +
* weight[2]*data[2].a +
* weight[3]*data[3].a;
* outData = newVertex;
* }
*
* @param coords
* Specifics the location of the new vertex.
* @param data
* Specifics the vertices used to create the new vertex.
* @param weight
* Specifics the weights used to create the new vertex.
* @param outData
* Reference user the put the coodinates of the new vertex.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #combineData combineData
*/
public void combine(double[] coords, Object[] data,
float[] weight, Object[] outData);
/**
* The same as the {@link #combine combine} callback method except
* that it takes an additional reference argument. This reference is
* identical to the opaque reference provided when {@link
* GLU#gluTessBeginPolygon gluTessBeginPolygon} was called.
*
* @param coords
* Specifics the location of the new vertex.
* @param data
* Specifics the vertices used to create the new vertex.
* @param weight
* Specifics the weights used to create the new vertex.
* @param outData
* Reference user the put the coodinates of the new vertex.
* @param polygonData
* Specifics a reference to user-defined data.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #combine combine
*/
public void combineData(double[] coords, Object[] data,
float[] weight, Object[] outData,
Object polygonData);
/**
* The error callback method is called when an error is encountered.
* The one argument is of type int; it indicates the specific error that
* occurred and will be set to one of GLU_TESS_MISSING_BEGIN_POLYGON,
* GLU_TESS_MISSING_END_POLYGON, GLU_TESS_MISSING_BEGIN_CONTOUR,
* GLU_TESS_MISSING_END_CONTOUR, GLU_TESS_COORD_TOO_LARGE,
* GLU_TESS_NEED_COMBINE_CALLBACK or GLU_OUT_OF_MEMORY.
* Character strings describing these errors can be retrieved with the
* {@link GLU#gluErrorString gluErrorString} call.
*
* The GLU library will recover from the first four errors by inserting the
* missing call(s). GLU_TESS_COORD_TOO_LARGE indicates that some
* vertex coordinate exceeded the predefined constant
* GLU_TESS_MAX_COORD in absolute value, and that the value has been
* clamped. (Coordinate values must be small enough so that two can be
* multiplied together without overflow.)
* GLU_TESS_NEED_COMBINE_CALLBACK indicates that the tessellation
* detected an intersection between two edges in the input data, and the
* GLU_TESS_COMBINE or GLU_TESS_COMBINE_DATA callback was not
* provided. No output is generated. GLU_OUT_OF_MEMORY indicates that
* there is not enough memory so no output is generated.
*
* @param errnum
* Specifics the error number code.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #errorData errorData
*/
public void error(int errnum);
/**
* The same as the {@link #error error} callback method except that
* it takes an additional reference argument. This reference is
* identical to the opaque reference provided when {@link
* GLU#gluTessBeginPolygon gluTessBeginPolygon} was called.
*
* @param errnum
* Specifics the error number code.
* @param polygonData
* Specifics a reference to user-defined data.
*
* @see GLU#gluTessCallback gluTessCallback
* @see #error error
*/
public void errorData(int errnum, Object polygonData);
//void mesh(com.sun.prism.opengl.impl.tessellator.GLUmesh mesh);
}