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package com.sun.opengl.impl.nurbs;
/*
** 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
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
**
** http://oss.sgi.com/projects/FreeB
**
** 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.
**
** 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.
*/
import javax.media.opengl.GL;
import javax.media.opengl.glu.GLU;
/**
* Class rendering curves with OpenGL
* @author Tomáš Hráský
*
*/
class OpenGLCurveEvaluator {
/**
* Output triangles (for callback) or render curve
*/
private boolean output_triangles;
/**
* OpenGL object
*/
private GL gl;
/**
* Not used
*/
private int vertex_flag;
/**
* Not used
*/
private int normal_flag;
/**
* Not used
*/
private int color_flag;
/**
* Not used
*/
private int texcoord_flag;
/**
* Number of bezier arc - used for color distinguishing of arcs forming NURBS curve
*/
private int poradi;
/**
* Makes new Evaluator
*/
public OpenGLCurveEvaluator() {
gl = GLU.getCurrentGL();
}
/**
* Pushes eval bit
*/
public void bgnmap1f() {
// DONE
if (output_triangles) {
vertex_flag = 0;
normal_flag = 0;
color_flag = 0;
texcoord_flag = 0;
} else {
gl.glPushAttrib(GL.GL_EVAL_BIT);
}
}
/**
* Pops all OpenGL attributes
*/
public void endmap1f() {
// DONE
if (output_triangles) {
} else {
gl.glPopAttrib();
}
}
/**
* Initializes opengl evaluator
* @param type curve type
* @param ulo lowest u
* @param uhi highest u
* @param stride control point coords
* @param order curve order
* @param ps control points
*/
public void map1f(int type, float ulo, float uhi, int stride, int order,
CArrayOfFloats ps) {
if (output_triangles) {
// TODO code for callback (output_triangles probably indicates callback)
// System.out.println("TODO curveevaluator.map1f-output_triangles");
} else {
gl.glMap1f(type, ulo, uhi, stride, order, ps.getArray(), ps
.getPointer());
// DEBUG - drawing bézier control points
// gl.glColor3d(.5,.5,.5);
// gl.glPointSize(5);
// gl.glBegin(GL.GL_POINTS);
// float[] ctrlpoints=ps.getArray();
// for(int i=ps.getPointer();i<ps.getPointer()+order;i++){
// gl.glVertex3d(ctrlpoints[i * 4], ctrlpoints[i * 4 + 1],0);
// }
// gl.glEnd();
}
}
/**
* Calls opengl enable
* @param type what to enable
*/
public void enable(int type) {
// DONE
gl.glEnable(type);
}
/**
* Calls glMapGrid1f
* @param nu steps
* @param u1 low u
* @param u2 high u
*/
public void mapgrid1f(int nu, float u1, float u2) {
if (output_triangles) {
// System.out.println("TODO curveevaluator.mapgrid1f");
} else
gl.glMapGrid1f(nu, u1, u2);
// // System.out.println("upravit NU");
// gl.glMapGrid1f(50,u1,u2);
}
/**
* Evaluates a curve using glEvalMesh1f
* @param style Backend.N_MESHFILL/N_MESHLINE/N_MESHPOINT
* @param from lowest param
* @param to highest param
*/
public void mapmesh1f(int style, int from, int to) {
/* //DEBUG drawing control points
this.poradi++;
if (poradi % 2 == 0)
gl.glColor3f(1, 0, 0);
else
gl.glColor3f(0, 1, 0);
*/
if (output_triangles) {
// TODO code for callback
// System.out.println("TODO openglcurveevaluator.mapmesh1f output_triangles");
} else {
switch (style) {
case Backend.N_MESHFILL:
case Backend.N_MESHLINE:
gl.glEvalMesh1(GL.GL_LINE, from, to);
break;
case Backend.N_MESHPOINT:
gl.glEvalMesh1(GL.GL_POINT, from, to);
break;
}
}
}
}
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