Source Code Cross Referenced for GeomBuffer.java in  » 6.0-JDK-Modules » java-3d » com » sun » j3d » utils » geometry » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » java 3d » com.sun.j3d.utils.geometry 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: GeomBuffer.java,v $
003:         *
004:         * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         *
010:         * - Redistribution of source code must retain the above copyright
011:         *   notice, this list of conditions and the following disclaimer.
012:         *
013:         * - Redistribution in binary form must reproduce the above copyright
014:         *   notice, this list of conditions and the following disclaimer in
015:         *   the documentation and/or other materials provided with the
016:         *   distribution.
017:         *
018:         * Neither the name of Sun Microsystems, Inc. or the names of
019:         * contributors may be used to endorse or promote products derived
020:         * from this software without specific prior written permission.
021:         *
022:         * This software is provided "AS IS," without a warranty of any
023:         * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
024:         * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
025:         * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
026:         * EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
027:         * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
028:         * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
029:         * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
030:         * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
031:         * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
032:         * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
033:         * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
034:         * POSSIBILITY OF SUCH DAMAGES.
035:         *
036:         * You acknowledge that this software is not designed, licensed or
037:         * intended for use in the design, construction, operation or
038:         * maintenance of any nuclear facility.
039:         *
040:         * $Revision: 1.6 $
041:         * $Date: 2007/04/24 18:50:59 $
042:         * $State: Exp $
043:         */
044:
045:        package com.sun.j3d.utils.geometry;
046:
047:        import com.sun.j3d.utils.geometry.*;
048:        import java.io.*;
049:        import java.util.*;
050:        import javax.media.j3d.*;
051:        import javax.vecmath.*;
052:        import java.math.*;
053:
054:        /** 
055:         * GeomBuffer allows OpenGL-like input of geometry data. It outputs 
056:         * Java 3D geometry array objects. This utility is to simplify porting
057:         * of OpenGL programs to Java 3D. 
058:         *<p>
059:         *    Here is a sample code that use this utility to create some quads.
060:         *  <P><blockquote><pre>
061:         * 
062:         *     GeomBuffer gbuf = new GeomBuffer(100);
063:         *     gbuf.begin(GeomBuffer.QUADS);
064:         *
065:         *     for (int i = 0; i < 5; i++){
066:         *       gbuf.normal3d(0.0, 1.0, 0.0);
067:         *       gbuf.vertex3d(1.0, 1.0, 0.0);
068:         * 
069:         *       gbuf.normal3d(0.0, 1.0, 0.0);
070:         *       gbuf.vertex3d(0.0, 1.0, 0.0);
071:         * 
072:         *       gbuf.normal3d(0.0, 1.0, 0.0);
073:         *       gbuf.vertex3d(0.0, 0.0, 0.0);
074:         * 
075:         *       gbuf.normal3d(0.0, 1.0, 0.0);
076:         *       gbuf.vertex3d(1.0, 0.0, 0.0);
077:         *     }
078:         *     gbuf.end();
079:         *     Shape3D shape = new Shape3D(gbuf.getGeom(GeomBuffer.GENERATE_NORMALS));
080:         * </pre></blockquote>
081:         *     Notice, that you only need to specify some upperbound on the number of 
082:         *     points you'll use at the beginning (100 in this case). 
083:         * <p>
084:         *     Currently, you are limited to one primitive type per geom buffer. Future
085:         *     versions will add support for mixed primitive types.
086:         *
087:         **/
088:
089:        class GeomBuffer extends Object {
090:
091:            //Supported Primitives
092:            static final int QUAD_STRIP = 0x01;
093:            static final int TRIANGLES = 0x02;
094:            static final int QUADS = 0x04;
095:            static final int TRIANGLE_FAN = 0x10;
096:            static final int TRIANGLE_STRIP = 0x20;
097:
098:            private int flags;
099:
100:            Point3f[] pts = null;
101:            Vector3f[] normals = null;
102:            TexCoord2f[] tcoords = null;
103:            int currVertCnt;
104:            int currPrimCnt;
105:            int[] currPrimType = null, currPrimStartVertex = null,
106:                    currPrimEndVertex = null;
107:            GeometryArray geometry;
108:            int numVerts = 0;
109:            int numTris = 0;
110:            int numTexUnit = 1;
111:            int texCoordSetMap[] = null;
112:
113:            static final int debug = 0;
114:
115:            /** Creates a geometry buffer of given number of vertices 
116:             * @param numVerts total number of vertices to allocate by this buffer. 
117:             *        This is an upper bound estimate.
118:             */
119:            GeomBuffer(int numVerts, int numTexUnit) {
120:                this .numTexUnit = numTexUnit;
121:                pts = new Point3f[numVerts];
122:                normals = new Vector3f[numVerts];
123:                tcoords = new TexCoord2f[numVerts];
124:                // max primitives is numV/3
125:                currPrimType = new int[numVerts / 3];
126:                currPrimStartVertex = new int[numVerts / 3];
127:                currPrimEndVertex = new int[numVerts / 3];
128:                currVertCnt = 0;
129:                currPrimCnt = 0;
130:
131:                texCoordSetMap = new int[numTexUnit];
132:                for (int i = 0; i < numTexUnit; i++)
133:                    texCoordSetMap[i] = 0;
134:
135:            }
136:
137:            GeomBuffer(int numVerts) {
138:                this (numVerts, 1);
139:            }
140:
141:            /*
142:             * Returns a Java 3D geometry array from the geometry buffer. You need to
143:             * call begin, vertex3d, end, etc. before calling this, of course.
144:             *
145:             * @param format vertex format.
146:             */
147:
148:            GeometryArray getGeom(int format) {
149:                GeometryArray obj = null;
150:                flags = format;
151:
152:                numTris = 0;
153:
154:                //Switch based on first primitive.
155:                switch (currPrimType[0]) {
156:                case TRIANGLES:
157:                    obj = processTriangles();
158:                    break;
159:                case QUADS:
160:                    obj = processQuads();
161:                    break;
162:                case QUAD_STRIP:
163:                case TRIANGLE_STRIP:
164:                    obj = processQuadStrips();
165:                    break;
166:                case TRIANGLE_FAN:
167:                    obj = processTriangleFan();
168:                    break;
169:                }
170:                if ((obj != null)
171:                        && ((flags & Primitive.ENABLE_GEOMETRY_PICKING) != 0)) {
172:                    obj.setCapability(Geometry.ALLOW_INTERSECT);
173:                    obj.setCapability(GeometryArray.ALLOW_FORMAT_READ);
174:                    obj.setCapability(GeometryArray.ALLOW_COUNT_READ);
175:                    obj.setCapability(GeometryArray.ALLOW_COORDINATE_READ);
176:                }
177:                return obj;
178:            }
179:
180:            /** 
181:             * Begins a new primitive given the primitive type.
182:             *
183:             * @param prim the primitive type (listed above).
184:             *
185:             **/
186:
187:            void begin(int prim) {
188:                if (debug >= 1)
189:                    System.out.println("quad");
190:                currPrimType[currPrimCnt] = prim;
191:                currPrimStartVertex[currPrimCnt] = currVertCnt;
192:            }
193:
194:            /** 
195:             * End of primitive.
196:             *
197:             *
198:             **/
199:            void end() {
200:                if (debug >= 1)
201:                    System.out.println("end");
202:                currPrimEndVertex[currPrimCnt] = currVertCnt;
203:                currPrimCnt++;
204:            }
205:
206:            void vertex3d(double x, double y, double z) {
207:
208:                if (debug >= 2)
209:                    System.out.println("v " + x + " " + y + " " + z);
210:                pts[currVertCnt] = new Point3f((float) x, (float) y, (float) z);
211:                currVertCnt++;
212:            }
213:
214:            void normal3d(double x, double y, double z) {
215:                if (debug >= 2)
216:                    System.out.println("n " + x + " " + y + " " + z);
217:                double sum = x * x + y * y + z * z;
218:                if (Math.abs(sum - 1.0) > 0.001) {
219:                    if (debug >= 2)
220:                        System.out.println("normalizing");
221:                    double root = Math.sqrt(sum);
222:                    if (root > 0.000001) {
223:                        x /= root;
224:                        y /= root;
225:                        z /= root;
226:                    } else {
227:                        y = z = 0.0;
228:                        x = 1.0;
229:                    }
230:                }
231:                normals[currVertCnt] = new Vector3f((float) x, (float) y,
232:                        (float) z);
233:            }
234:
235:            void texCoord2d(double s, double t) {
236:                if (debug >= 2)
237:                    System.out.println("t " + s + " " + t);
238:                tcoords[currVertCnt] = new TexCoord2f((float) s, (float) t);
239:            }
240:
241:            // Return a reference to the texture coordinates of this geom buffer.
242:            TexCoord2f[] getTexCoords() {
243:                return tcoords;
244:            }
245:
246:            /**
247:             * Returns the Java 3D geometry gotten from calling getGeom.
248:             *
249:             **/
250:
251:            GeometryArray getComputedGeometry() {
252:                return geometry;
253:            }
254:
255:            int getNumTris() {
256:                return numTris;
257:            }
258:
259:            int getNumVerts() {
260:                return numVerts;
261:            }
262:
263:            private GeometryArray processQuadStrips() {
264:                GeometryArray obj = null;
265:                int i;
266:                int totalVerts = 0;
267:
268:                // Calculate how many vertices needed to hold all of the individual quads
269:                int stripCounts[] = new int[currPrimCnt];
270:                for (i = 0; i < currPrimCnt; i++) {
271:                    stripCounts[i] = currPrimEndVertex[i]
272:                            - currPrimStartVertex[i];
273:                    totalVerts += stripCounts[i];
274:                }
275:
276:                if (debug >= 1)
277:                    System.out.println("totalVerts " + totalVerts);
278:
279:                int tsaFlags = TriangleStripArray.COORDINATES;
280:                if ((flags & Primitive.GENERATE_NORMALS) != 0)
281:                    tsaFlags |= TriangleStripArray.NORMALS;
282:                if ((flags & Primitive.GENERATE_TEXTURE_COORDS) != 0)
283:                    tsaFlags |= TriangleStripArray.TEXTURE_COORDINATE_2;
284:
285:                // Create GeometryArray to pass back
286:                obj = new TriangleStripArray(totalVerts, tsaFlags, 1,
287:                        texCoordSetMap, stripCounts);
288:
289:                // Allocate space to store new vertex info
290:                Point3f[] newpts = new Point3f[totalVerts];
291:                Vector3f[] newnormals = new Vector3f[totalVerts];
292:                TexCoord2f[] newtcoords = new TexCoord2f[totalVerts];
293:                int currVert = 0;
294:
295:                // Repeat for each Quad Strip
296:                for (i = 0; i < currPrimCnt; i++) {
297:                    // Output order for these quad arrays same as java 3d triangle strips
298:                    for (int j = currPrimStartVertex[i]; j < currPrimEndVertex[i]; j++) {
299:                        outVertex(newpts, newnormals, newtcoords, currVert++,
300:                                pts, normals, tcoords, j);
301:                    }
302:
303:                }
304:
305:                numVerts = currVert;
306:                numTris += totalVerts - currPrimCnt * 2;
307:
308:                obj.setCoordinates(0, newpts);
309:                if ((flags & Primitive.GENERATE_NORMALS) != 0)
310:                    obj.setNormals(0, newnormals);
311:                if ((flags & Primitive.GENERATE_TEXTURE_COORDS) != 0)
312:                    obj.setTextureCoordinates(0, 0, newtcoords);
313:
314:                geometry = obj;
315:                return obj;
316:            }
317:
318:            private GeometryArray processQuads() {
319:                GeometryArray obj = null;
320:                int i;
321:                int totalVerts = 0;
322:
323:                for (i = 0; i < currPrimCnt; i++) {
324:                    totalVerts += currPrimEndVertex[i] - currPrimStartVertex[i];
325:                }
326:
327:                if (debug >= 1)
328:                    System.out.println("totalVerts " + totalVerts);
329:
330:                if (((flags & Primitive.GENERATE_NORMALS) != 0)
331:                        && ((flags & Primitive.GENERATE_TEXTURE_COORDS) != 0)) {
332:                    obj = new QuadArray(totalVerts, QuadArray.COORDINATES
333:                            | QuadArray.NORMALS
334:                            | QuadArray.TEXTURE_COORDINATE_2, 1, texCoordSetMap);
335:                } else if (((flags & Primitive.GENERATE_NORMALS) == 0)
336:                        && ((flags & Primitive.GENERATE_TEXTURE_COORDS) != 0)) {
337:                    obj = new QuadArray(totalVerts, QuadArray.COORDINATES
338:                            | QuadArray.TEXTURE_COORDINATE_2, 1, texCoordSetMap);
339:                } else if (((flags & Primitive.GENERATE_NORMALS) != 0)
340:                        && ((flags & Primitive.GENERATE_TEXTURE_COORDS) == 0)) {
341:                    obj = new QuadArray(totalVerts, QuadArray.COORDINATES
342:                            | QuadArray.NORMALS);
343:                } else {
344:                    obj = new QuadArray(totalVerts, QuadArray.COORDINATES);
345:                }
346:
347:                Point3f[] newpts = new Point3f[totalVerts];
348:                Vector3f[] newnormals = new Vector3f[totalVerts];
349:                TexCoord2f[] newtcoords = new TexCoord2f[totalVerts];
350:                int currVert = 0;
351:
352:                if (debug > 1)
353:                    System.out.println("total prims " + currPrimCnt);
354:
355:                for (i = 0; i < currPrimCnt; i++) {
356:                    if (debug > 1)
357:                        System.out.println("start " + currPrimStartVertex[i]
358:                                + " end " + currPrimEndVertex[i]);
359:                    for (int j = currPrimStartVertex[i]; j < currPrimEndVertex[i] - 3; j += 4) {
360:                        outVertex(newpts, newnormals, newtcoords, currVert++,
361:                                pts, normals, tcoords, j);
362:                        outVertex(newpts, newnormals, newtcoords, currVert++,
363:                                pts, normals, tcoords, j + 1);
364:                        outVertex(newpts, newnormals, newtcoords, currVert++,
365:                                pts, normals, tcoords, j + 2);
366:                        outVertex(newpts, newnormals, newtcoords, currVert++,
367:                                pts, normals, tcoords, j + 3);
368:                        numTris += 2;
369:                    }
370:                }
371:                numVerts = currVert;
372:
373:                obj.setCoordinates(0, newpts);
374:                if ((flags & Primitive.GENERATE_NORMALS) != 0)
375:                    obj.setNormals(0, newnormals);
376:                if ((flags & Primitive.GENERATE_TEXTURE_COORDS) != 0)
377:                    obj.setTextureCoordinates(0, 0, newtcoords);
378:
379:                geometry = obj;
380:                return obj;
381:            }
382:
383:            private GeometryArray processTriangles() {
384:                GeometryArray obj = null;
385:                int i;
386:                int totalVerts = 0;
387:
388:                for (i = 0; i < currPrimCnt; i++) {
389:                    totalVerts += currPrimEndVertex[i] - currPrimStartVertex[i];
390:                }
391:
392:                if (debug >= 1)
393:                    System.out.println("totalVerts " + totalVerts);
394:
395:                if (((flags & Primitive.GENERATE_NORMALS) != 0)
396:                        && ((flags & Primitive.GENERATE_TEXTURE_COORDS) != 0)) {
397:                    obj = new TriangleArray(totalVerts,
398:                            TriangleArray.COORDINATES | TriangleArray.NORMALS
399:                                    | TriangleArray.TEXTURE_COORDINATE_2, 1,
400:                            texCoordSetMap);
401:                } else if (((flags & Primitive.GENERATE_NORMALS) == 0)
402:                        && ((flags & Primitive.GENERATE_TEXTURE_COORDS) != 0)) {
403:                    obj = new TriangleArray(totalVerts,
404:                            TriangleArray.COORDINATES
405:                                    | TriangleArray.TEXTURE_COORDINATE_2, 1,
406:                            texCoordSetMap);
407:                } else if (((flags & Primitive.GENERATE_NORMALS) != 0)
408:                        && ((flags & Primitive.GENERATE_TEXTURE_COORDS) == 0)) {
409:                    obj = new TriangleArray(totalVerts,
410:                            TriangleArray.COORDINATES | TriangleArray.NORMALS);
411:                } else {
412:                    obj = new TriangleArray(totalVerts,
413:                            TriangleArray.COORDINATES);
414:                }
415:
416:                Point3f[] newpts = new Point3f[totalVerts];
417:                Vector3f[] newnormals = new Vector3f[totalVerts];
418:                TexCoord2f[] newtcoords = new TexCoord2f[totalVerts];
419:                int currVert = 0;
420:
421:                for (i = 0; i < currPrimCnt; i++) {
422:                    for (int j = currPrimStartVertex[i]; j < currPrimEndVertex[i] - 2; j += 3) {
423:                        outVertex(newpts, newnormals, newtcoords, currVert++,
424:                                pts, normals, tcoords, j);
425:                        outVertex(newpts, newnormals, newtcoords, currVert++,
426:                                pts, normals, tcoords, j + 1);
427:                        outVertex(newpts, newnormals, newtcoords, currVert++,
428:                                pts, normals, tcoords, j + 2);
429:                        numTris += 1;
430:                    }
431:                }
432:                numVerts = currVert;
433:
434:                obj.setCoordinates(0, newpts);
435:                if ((flags & Primitive.GENERATE_NORMALS) != 0)
436:                    obj.setNormals(0, newnormals);
437:                if ((flags & Primitive.GENERATE_TEXTURE_COORDS) != 0)
438:                    obj.setTextureCoordinates(0, 0, newtcoords);
439:
440:                geometry = obj;
441:                return obj;
442:            }
443:
444:            private GeometryArray processTriangleFan() {
445:                if (debug > 0)
446:                    System.out.println("processTriangleFan");
447:
448:                GeometryArray obj = null;
449:                int i;
450:                int totalVerts = 0;
451:
452:                int stripCounts[] = new int[currPrimCnt];
453:
454:                // figure out how many vertices we need to hold the individual fans
455:                for (i = 0; i < currPrimCnt; i++) {
456:                    stripCounts[i] = currPrimEndVertex[i]
457:                            - currPrimStartVertex[i];
458:                    totalVerts += stripCounts[i];
459:                }
460:
461:                // figure out what flags we need
462:                int tfFlags = TriangleFanArray.COORDINATES;
463:                if ((flags & Primitive.GENERATE_NORMALS) != 0) {
464:                    tfFlags |= TriangleFanArray.NORMALS;
465:                }
466:                if ((flags & Primitive.GENERATE_TEXTURE_COORDS) != 0) {
467:                    tfFlags |= TriangleFanArray.TEXTURE_COORDINATE_2;
468:                }
469:
470:                // create the TriangleFanArray
471:                obj = new TriangleFanArray(totalVerts, tfFlags, 1,
472:                        texCoordSetMap, stripCounts);
473:
474:                // allocate space for vertex info
475:                Point3f[] newpts = new Point3f[totalVerts];
476:                Vector3f[] newnormals = new Vector3f[totalVerts];
477:                TexCoord2f[] newtcoords = new TexCoord2f[totalVerts];
478:
479:                int currVert = 0;
480:
481:                // repeat for each fan
482:                for (i = 0; i < currPrimCnt; i++) {
483:                    for (int j = currPrimStartVertex[i]; j < currPrimEndVertex[i]; j++) {
484:                        outVertex(newpts, newnormals, newtcoords, currVert++,
485:                                pts, normals, tcoords, j);
486:                    }
487:                }
488:
489:                for (i = 0; i < newpts.length; i++) {
490:                    if (debug > 1)
491:                        System.out.println("i = " + i + " " + newpts[i]);
492:                }
493:
494:                numVerts = currVert;
495:                numTris = totalVerts - currPrimCnt * 2;
496:
497:                // set the coordinates on the GeometryArray
498:                obj.setCoordinates(0, newpts);
499:
500:                // set the normals and tex coords if necessary
501:                if ((flags & Primitive.GENERATE_NORMALS) != 0) {
502:                    obj.setNormals(0, newnormals);
503:                }
504:                if ((flags & Primitive.GENERATE_TEXTURE_COORDS) != 0) {
505:                    obj.setTextureCoordinates(0, 0, newtcoords);
506:                }
507:                geometry = obj;
508:                return obj;
509:            }
510:
511:            void outVertex(Point3f[] dpts, Vector3f[] dnormals,
512:                    TexCoord2f[] dtcoords, int dloc, Point3f[] spts,
513:                    Vector3f[] snormals, TexCoord2f[] stcoords, int sloc) {
514:                if (debug >= 1)
515:                    System.out.println("v " + spts[sloc].x + " " + spts[sloc].y
516:                            + " " + spts[sloc].z);
517:
518:                // PSP: Do we really need new points here?
519:
520:                dpts[dloc] = new Point3f(spts[sloc]);
521:
522:                if ((flags & Primitive.GENERATE_NORMALS) != 0) {
523:                    dnormals[dloc] = new Vector3f(snormals[sloc]);
524:                }
525:                if ((flags & Primitive.GENERATE_TEXTURE_COORDS) != 0) {
526:                    if (debug >= 2)
527:                        System.out.println("final out tcoord");
528:                    dtcoords[dloc] = new TexCoord2f(stcoords[sloc]);
529:                }
530:            }
531:        }
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