1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
|
package nehe.lesson36_radial_blur;
import com.sun.opengl.util.BufferUtil;
import javax.media.opengl.GL;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.DebugGL;
import javax.media.opengl.glu.GLU;
import java.nio.ByteBuffer;
public class Renderer implements GLEventListener {
private int TEXTURE_SIZE = 128;
private static final int x = 0; // Define X Coord
private static final int y = 1; // Define Y Coord
private static final int z = 2; // Define Z Coord
// User Defined Variables
private float angle; // Used To Rotate The Helix
private float[][] vertexes = new float[4][3]; // Holds Float Info For 4 Sets Of Vertices
private float[] normal = new float[3]; // An Array To Store The Normal Data
private int blurTexture; // An Unsigned Int To Store The Texture Number
private long previousTime = System.currentTimeMillis();
private GLU glu = new GLU();
private int frameBufferObject;
private int createBlurTexture(GL gl) { // Create An Empty Texture
ByteBuffer data = BufferUtil.newByteBuffer(TEXTURE_SIZE * TEXTURE_SIZE); // Create Storage Space For Texture Data (128x128x4)
data.limit(data.capacity());
int[] txtnumber = new int[1];
gl.glGenTextures(1, txtnumber, 0); // Create 1 Texture
gl.glBindTexture(GL.GL_TEXTURE_2D, txtnumber[0]); // Bind The Texture
gl.glTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_LUMINANCE, TEXTURE_SIZE, TEXTURE_SIZE, 0, GL.GL_LUMINANCE, GL.GL_UNSIGNED_BYTE, data); // Build Texture Using Information In data
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);
return txtnumber[0]; // Return The Texture ID
}
private void normalize(float[] vector) { // Normalizes A Vector (3 Coordinates)
// To A Unit Normal Vector With A Length Of One.
// Calculates The Length Of The Vector
float length = (float) Math.sqrt((vector[0] * vector[0]) + (vector[1] * vector[1]) + (vector[2] * vector[2]));
if (length == 0.0f) // Prevents Divide By 0 Error By Providing
{
length = 1.0f; // An Acceptable Value For Vectors To Close To 0.
}
vector[0] /= length; // Dividing Each Element By
vector[1] /= length; // The Length Results In A
vector[2] /= length; // Unit Normal Vector.
}
private void calcNormal(float[][] v/*[3][3]*/, float[] out/*[3]*/) { // Calculates Normal For A Quad Using 3 Points
float[] v1 = new float[3];
float[] v2 = new float[3]; // Vector 1 (x,y,z) & Vector 2 (x,y,z)
// Finds The Vector Between 2 Points By Subtracting
// The x,y,z Coordinates From One Point To Another.
// Calculate The Vector From Point 1 To Point 0
v1[x] = v[0][x] - v[1][x]; // Vector 1.x=Vertex[0].x-Vertex[1].x
v1[y] = v[0][y] - v[1][y]; // Vector 1.y=Vertex[0].y-Vertex[1].y
v1[z] = v[0][z] - v[1][z]; // Vector 1.z=Vertex[0].y-Vertex[1].z
// Calculate The Vector From Point 2 To Point 1
v2[x] = v[1][x] - v[2][x]; // Vector 2.x=Vertex[0].x-Vertex[1].x
v2[y] = v[1][y] - v[2][y]; // Vector 2.y=Vertex[0].y-Vertex[1].y
v2[z] = v[1][z] - v[2][z]; // Vector 2.z=Vertex[0].z-Vertex[1].z
// Compute The Cross Product To Give Us A Surface Normal
out[x] = v1[y] * v2[z] - v1[z] * v2[y]; // Cross Product For Y - Z
out[y] = v1[z] * v2[x] - v1[x] * v2[z]; // Cross Product For X - Z
out[z] = v1[x] * v2[y] - v1[y] * v2[x]; // Cross Product For X - Y
normalize(out); // Normalize The Vectors
}
private void processHelix(GL gl, GLU glu) { // Draws A Helix
float x; // Helix x Coordinate
float y; // Helix y Coordinate
float z; // Helix z Coordinate
float phi; // Angle
float theta; // Angle
float v, u; // Angles
float r; // Radius Of Twist
int twists = 5; // 5 Twists
float[] glfMaterialColor = new float[]{0.4f, 0.2f, 0.8f, 1.0f}; // Set The Material Color
float[] specular = new float[]{1.0f, 1.0f, 1.0f, 1.0f}; // Sets Up Specular Lighting
gl.glLoadIdentity(); // Reset The Modelview Matrix
glu.gluLookAt(0, 5, 50, 0, 0, 0, 0, 1, 0); // Eye Position (0,5,50) Center Of Scene (0,0,0), Up On Y Axis
gl.glPushMatrix(); // Push The Modelview Matrix
gl.glTranslatef(0, 0, -50); // Translate 50 Units Into The Screen
gl.glRotatef(angle / 2.0f, 1, 0, 0); // Rotate By angle/2 On The X-Axis
gl.glRotatef(angle / 3.0f, 0, 1, 0); // Rotate By angle/3 On The Y-Axis
gl.glMaterialfv(GL.GL_FRONT_AND_BACK, GL.GL_AMBIENT_AND_DIFFUSE, glfMaterialColor, 0);
gl.glMaterialfv(GL.GL_FRONT_AND_BACK, GL.GL_SPECULAR, specular, 0);
r = 1.5f; // Radius
gl.glBegin(GL.GL_QUADS); // Begin Drawing Quads
for (phi = 0; phi <= 360; phi += 20.0) // 360 Degrees In Steps Of 20
{
for (theta = 0; theta <= 360 * twists; theta += 20.0) // 360 Degrees * Number Of Twists In Steps Of 20
{
v = (phi / 180.0f * 3.142f); // Calculate Angle Of First Point ( 0 )
u = (theta / 180.0f * 3.142f); // Calculate Angle Of First Point ( 0 )
x = (float) (Math.cos(u) * (2.0f + Math.cos(v))) * r; // Calculate x Position (1st Point)
y = (float) (Math.sin(u) * (2.0f + Math.cos(v))) * r; // Calculate y Position (1st Point)
z = (float) (((u - (2.0f * 3.142f)) + Math.sin(v)) * r); // Calculate z Position (1st Point)
vertexes[0][0] = x; // Set x Value Of First Vertex
vertexes[0][1] = y; // Set y Value Of First Vertex
vertexes[0][2] = z; // Set z Value Of First Vertex
v = (phi / 180.0f * 3.142f); // Calculate Angle Of Second Point ( 0 )
u = ((theta + 20) / 180.0f * 3.142f); // Calculate Angle Of Second Point ( 20 )
x = (float) (Math.cos(u) * (2.0f + Math.cos(v))) * r; // Calculate x Position (2nd Point)
y = (float) (Math.sin(u) * (2.0f + Math.cos(v))) * r; // Calculate y Position (2nd Point)
z = (float) (((u - (2.0f * 3.142f)) + Math.sin(v)) * r); // Calculate z Position (2nd Point)
vertexes[1][0] = x; // Set x Value Of Second Vertex
vertexes[1][1] = y; // Set y Value Of Second Vertex
vertexes[1][2] = z; // Set z Value Of Second Vertex
v = ((phi + 20) / 180.0f * 3.142f); // Calculate Angle Of Third Point ( 20 )
u = ((theta + 20) / 180.0f * 3.142f); // Calculate Angle Of Third Point ( 20 )
x = (float) (Math.cos(u) * (2.0f + Math.cos(v))) * r; // Calculate x Position (3rd Point)
y = (float) (Math.sin(u) * (2.0f + Math.cos(v))) * r; // Calculate y Position (3rd Point)
z = (float) (((u - (2.0f * 3.142f)) + Math.sin(v)) * r); // Calculate z Position (3rd Point)
vertexes[2][0] = x; // Set x Value Of Third Vertex
vertexes[2][1] = y; // Set y Value Of Third Vertex
vertexes[2][2] = z; // Set z Value Of Third Vertex
v = ((phi + 20) / 180.0f * 3.142f); // Calculate Angle Of Fourth Point ( 20 )
u = ((theta) / 180.0f * 3.142f); // Calculate Angle Of Fourth Point ( 0 )
x = (float) (Math.cos(u) * (2.0f + Math.cos(v))) * r; // Calculate x Position (4th Point)
y = (float) (Math.sin(u) * (2.0f + Math.cos(v))) * r; // Calculate y Position (4th Point)
z = (float) (((u - (2.0f * 3.142f)) + Math.sin(v)) * r); // Calculate z Position (4th Point)
vertexes[3][0] = x; // Set x Value Of Fourth Vertex
vertexes[3][1] = y; // Set y Value Of Fourth Vertex
vertexes[3][2] = z; // Set z Value Of Fourth Vertex
calcNormal(vertexes, normal); // Calculate The Quad Normal
gl.glNormal3f(normal[0], normal[1], normal[2]); // Set The Normal
// Render The Quad
gl.glVertex3f(vertexes[0][0], vertexes[0][1], vertexes[0][2]);
gl.glVertex3f(vertexes[1][0], vertexes[1][1], vertexes[1][2]);
gl.glVertex3f(vertexes[2][0], vertexes[2][1], vertexes[2][2]);
gl.glVertex3f(vertexes[3][0], vertexes[3][1], vertexes[3][2]);
}
}
gl.glEnd(); // Done Rendering Quads
gl.glPopMatrix(); // Pop The Matrix
}
private void viewOrtho(GL gl) // Set Up An Ortho View
{
gl.glMatrixMode(GL.GL_PROJECTION); // Select Projection
gl.glPushMatrix(); // Push The Matrix
gl.glLoadIdentity(); // Reset The Matrix
gl.glOrtho(0, 640, 480, 0, -1, 1); // Select Ortho Mode (640x480)
gl.glMatrixMode(GL.GL_MODELVIEW); // Select Modelview Matrix
gl.glPushMatrix(); // Push The Matrix
gl.glLoadIdentity(); // Reset The Matrix
}
private void viewPerspective(GL gl) // Set Up A Perspective View
{
gl.glMatrixMode(GL.GL_PROJECTION); // Select Projection
gl.glPopMatrix(); // Pop The Matrix
gl.glMatrixMode(GL.GL_MODELVIEW); // Select Modelview
gl.glPopMatrix(); // Pop The Matrix
}
/**
* Renders To A Texture
*/
private void renderToTexture(GL gl, GLU glu)
{
if (frameBufferObject != -1) {
// Bind the fbo
gl.glBindFramebufferEXT(GL.GL_FRAMEBUFFER_EXT, frameBufferObject);
}
// Set Our Viewport (Match Texture Size)
gl.glViewport(0, 0, TEXTURE_SIZE, TEXTURE_SIZE);
// Clear the frame buffer (either the default frame buffer or the fbo)
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
// Render The Helix
processHelix(gl, glu);
// Copy Our ViewPort To The Blur Texture (From 0,0 To 128,128... No Border)
gl.glBindTexture(GL.GL_TEXTURE_2D, blurTexture);
gl.glCopyTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_LUMINANCE, 0, 0, TEXTURE_SIZE, TEXTURE_SIZE, 0);
if (frameBufferObject != -1) {
// If we used the fbo, restore the default frame buffer
gl.glBindFramebufferEXT(GL.GL_FRAMEBUFFER_EXT, 0);
}
// Restore the viewport (0,0 to 640x480)
gl.glViewport(0, 0, 640, 480);
}
private void drawBlur(GL gl, int times, float inc) // Draw The Blurred Image
{
float spost = 0.0f; // Starting Texture Coordinate Offset
float alpha = 0.2f; // Starting Alpha Value
// Disable AutoTexture Coordinates
gl.glDisable(GL.GL_TEXTURE_GEN_S);
gl.glDisable(GL.GL_TEXTURE_GEN_T);
gl.glEnable(GL.GL_TEXTURE_2D); // Enable 2D Texture Mapping
gl.glDisable(GL.GL_DEPTH_TEST); // Disable Depth Testing
gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE); // Set Blending Mode
gl.glEnable(GL.GL_BLEND); // Enable Blending
gl.glBindTexture(GL.GL_TEXTURE_2D, blurTexture); // Bind To The Blur Texture
viewOrtho(gl); // Switch To An Ortho View
float alphainc = alpha / times; // alphainc=0.2f / Times To Render Blur
gl.glBegin(GL.GL_QUADS); // Begin Drawing Quads
for (int num = 0; num < times; num++) // Number Of Times To Render Blur
{
gl.glColor4f(1.0f, 1.0f, 1.0f, alpha); // Set The Alpha Value (Starts At 0.2)
gl.glTexCoord2f(0 + spost, 1 - spost); // Texture Coordinate ( 0, 1 )
gl.glVertex2f(0, 0); // First Vertex ( 0, 0 )
gl.glTexCoord2f(0 + spost, 0 + spost); // Texture Coordinate ( 0, 0 )
gl.glVertex2f(0, 480); // Second Vertex ( 0, 480 )
gl.glTexCoord2f(1 - spost, 0 + spost); // Texture Coordinate ( 1, 0 )
gl.glVertex2f(640, 480); // Third Vertex ( 640, 480 )
gl.glTexCoord2f(1 - spost, 1 - spost); // Texture Coordinate ( 1, 1 )
gl.glVertex2f(640, 0); // Fourth Vertex ( 640, 0 )
spost += inc; // Gradually Increase spost (Zooming Closer To Texture Center)
alpha = alpha - alphainc; // Gradually Decrease alpha (Gradually Fading Image Out)
}
gl.glEnd(); // Done Drawing Quads
viewPerspective(gl); // Switch To A Perspective View
gl.glEnable(GL.GL_DEPTH_TEST); // Enable Depth Testing
gl.glDisable(GL.GL_TEXTURE_2D); // Disable 2D Texture Mapping
gl.glDisable(GL.GL_TEXTURE_2D); // Disable 2D Texture Mapping
gl.glDisable(GL.GL_TEXTURE_2D); // Disable 2D Texture Mapping
gl.glDisable(GL.GL_BLEND); // Disable Blending
gl.glBindTexture(GL.GL_TEXTURE_2D, 0); // Unbind The Blur Texture
}
public void init(GLAutoDrawable drawable) {
drawable.setGL(new DebugGL(drawable.getGL()));
GL gl = drawable.getGL();
// Start Of User Initialization
angle = 0.0f; // Set Starting Angle To Zero
// Create Our Empty Texture
blurTexture = createBlurTexture(gl);
if (gl.isExtensionAvailable("GL_EXT_framebuffer_object")) {
frameBufferObject = createFrameBufferObject(gl);
} else {
frameBufferObject = -1;
}
gl.glEnable(GL.GL_DEPTH_TEST); // Enable Depth Testing
float[] global_ambient = new float[]{0.2f, 0.2f, 0.2f, 1.0f}; // Set Ambient Lighting To Fairly Dark Light (No Color)
float[] light0pos = new float[]{0.0f, 5.0f, 10.0f, 1.0f}; // Set The Light Position
float[] light0ambient = new float[]{0.2f, 0.2f, 0.2f, 1.0f}; // More Ambient Light
float[] light0diffuse = new float[]{0.3f, 0.3f, 0.3f, 1.0f}; // Set The Diffuse Light A Bit Brighter
float[] light0specular = new float[]{0.8f, 0.8f, 0.8f, 1.0f}; // Fairly Bright Specular Lighting
float[] lmodel_ambient = new float[]{0.2f, 0.2f, 0.2f, 1.0f}; // And More Ambient Light
gl.glLightModelfv(GL.GL_LIGHT_MODEL_AMBIENT, lmodel_ambient, 0);// Set The Ambient Light Model
gl.glLightModelfv(GL.GL_LIGHT_MODEL_AMBIENT, global_ambient, 0);// Set The Global Ambient Light Model
gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, light0pos, 0); // Set The Lights Position
gl.glLightfv(GL.GL_LIGHT0, GL.GL_AMBIENT, light0ambient, 0); // Set The Ambient Light
gl.glLightfv(GL.GL_LIGHT0, GL.GL_DIFFUSE, light0diffuse, 0); // Set The Diffuse Light
gl.glLightfv(GL.GL_LIGHT0, GL.GL_SPECULAR, light0specular, 0); // Set Up Specular Lighting
gl.glEnable(GL.GL_LIGHTING); // Enable Lighting
gl.glEnable(GL.GL_LIGHT0); // Enable Light0
gl.glShadeModel(GL.GL_SMOOTH); // Select Smooth Shading
gl.glMateriali(GL.GL_FRONT, GL.GL_SHININESS, 128);
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Set The Clear Color To Black
}
/**
* Creates a frame buffer object.
* @return the newly created frame buffer object is or -1 if a frame buffer object could not be created
*/
private int createFrameBufferObject(GL gl) {
// Create the FBO
int[] frameBuffer = new int[1];
gl.glGenFramebuffersEXT(1, frameBuffer, 0);
gl.glBindFramebufferEXT(GL.GL_FRAMEBUFFER_EXT, frameBuffer[0]);
// Create a TEXTURE_SIZE x TEXTURE_SIZE RGBA texture that will be used as color attachment
// for the fbo.
int[] colorBuffer = new int[1];
gl.glGenTextures(1, colorBuffer, 0); // Create 1 Texture
gl.glBindTexture(GL.GL_TEXTURE_2D, colorBuffer[0]); // Bind The Texture
gl.glTexImage2D( // Build Texture Using Information In data
GL.GL_TEXTURE_2D,
0,
GL.GL_RGBA,
TEXTURE_SIZE,
TEXTURE_SIZE,
0,
GL.GL_RGBA,
GL.GL_UNSIGNED_BYTE,
BufferUtil.newByteBuffer(TEXTURE_SIZE * TEXTURE_SIZE * 4)
);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);
// Attach the texture to the frame buffer as the color attachment. This
// will cause the results of rendering to the FBO to be written in the blur texture.
gl.glFramebufferTexture2DEXT(
GL.GL_FRAMEBUFFER_EXT,
GL.GL_COLOR_ATTACHMENT0_EXT,
GL.GL_TEXTURE_2D,
colorBuffer[0],
0
);
gl.glBindTexture(GL.GL_TEXTURE_2D, 0);
// Create a 24-bit TEXTURE_SIZE x TEXTURE_SIZE depth buffer for the FBO.
// We need this to get correct rendering results.
int[] depthBuffer = new int[1];
gl.glGenRenderbuffersEXT(1, depthBuffer, 0);
gl.glBindRenderbufferEXT(GL.GL_RENDERBUFFER_EXT, depthBuffer[0]);
gl.glRenderbufferStorageEXT(GL.GL_RENDERBUFFER_EXT, GL.GL_DEPTH_COMPONENT24, TEXTURE_SIZE, TEXTURE_SIZE);
// Attach the newly created depth buffer to the FBO.
gl.glFramebufferRenderbufferEXT(
GL.GL_FRAMEBUFFER_EXT,
GL.GL_DEPTH_ATTACHMENT_EXT,
GL.GL_RENDERBUFFER_EXT,
depthBuffer[0]
);
// Make sure the framebuffer object is complete (i.e. set up correctly)
int status = gl.glCheckFramebufferStatusEXT(GL.GL_FRAMEBUFFER_EXT);
if (status == GL.GL_FRAMEBUFFER_COMPLETE_EXT) {
return frameBuffer[0];
} else {
// No matter what goes wrong, we simply delete the frame buffer object
// This switch statement simply serves to list all possible error codes
switch(status) {
case GL.GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENTS_EXT:
// One of the attachments is incomplete
case GL.GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
// Not all attachments have the same size
case GL.GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
// The desired read buffer has no attachment
case GL.GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
// The desired draw buffer has no attachment
case GL.GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
// Not all color attachments have the same internal format
case GL.GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
// No attachments have been attached
case GL.GL_FRAMEBUFFER_UNSUPPORTED_EXT:
// The combination of internal formats is not supported
case GL.GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT:
// This value is no longer in the EXT_framebuffer_object specification
case GL.GL_FRAMEBUFFER_STATUS_ERROR_EXT:
// This value is no longer in the EXT_framebuffer_object specification
default:
// Delete the color buffer texture
gl.glDeleteTextures(1, colorBuffer, 0);
// Delete the depth buffer
gl.glDeleteRenderbuffersEXT(1, depthBuffer, 0);
// Delete the FBO
gl.glDeleteFramebuffersEXT(1, frameBuffer, 0);
return -1;
}
}
}
private void update(long milliseconds) { // Perform Motion Updates Here
angle += (float) (milliseconds) / 5.0f; // Update angle Based On The Clock
}
public void display(GLAutoDrawable drawable) {
long currentTime = System.currentTimeMillis();
update(currentTime - previousTime);
previousTime = currentTime;
GL gl = drawable.getGL();
gl.glLoadIdentity(); // Reset The View
renderToTexture(gl, glu); // Render To A Texture
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Set The Clear Color To Black
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
processHelix(gl, glu); // Draw Our Helix
drawBlur(gl, 25, 0.02f); // Draw The Blur Effect
gl.glFlush(); // Flush The GL Rendering Pipeline
}
public void reshape(GLAutoDrawable drawable,
int xstart,
int ystart,
int width,
int height) {
GL gl = drawable.getGL();
height = (height == 0) ? 1 : height;
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluPerspective(50, (float) width / height, 5, 2000);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
}
public void displayChanged(GLAutoDrawable drawable,
boolean modeChanged,
boolean deviceChanged) {
}
} |
Générer une hélice adn en 3D
Répondre avec citation
Partager