forked from KeckCAVES/SARndbox
/
WaterTable2.cpp
1122 lines (956 loc) · 43.9 KB
/
WaterTable2.cpp
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
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/***********************************************************************
WaterTable2 - Class to simulate water flowing over a surface using
improved water flow simulation based on Saint-Venant system of partial
differenctial equations.
Copyright (c) 2012-2016 Oliver Kreylos
This file is part of the Augmented Reality Sandbox (SARndbox).
The Augmented Reality Sandbox is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The Augmented Reality Sandbox is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along
with the Augmented Reality Sandbox; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
***********************************************************************/
#include "WaterTable2.h"
#include <stdarg.h>
#include <stdio.h>
#include <string>
#include <Math/Math.h>
#include <Geometry/AffineCombiner.h>
#include <Geometry/Vector.h>
#include <GL/gl.h>
#include <GL/Extensions/GLARBDrawBuffers.h>
#include <GL/Extensions/GLARBFragmentShader.h>
#include <GL/Extensions/GLARBMultitexture.h>
#include <GL/Extensions/GLARBShaderObjects.h>
#include <GL/Extensions/GLARBTextureFloat.h>
#include <GL/Extensions/GLARBTextureRectangle.h>
#include <GL/Extensions/GLARBTextureRg.h>
#include <GL/Extensions/GLARBVertexShader.h>
#include <GL/Extensions/GLEXTFramebufferObject.h>
#include <GL/GLContextData.h>
#include <GL/GLTransformationWrappers.h>
#include "DepthImageRenderer.h"
#include "ShaderHelper.h"
// DEBUGGING
// #include <iostream>
namespace {
/****************
Helper functions:
****************/
GLfloat* makeBuffer(int width,int height,int numComponents,...)
{
va_list ap;
va_start(ap,numComponents);
GLfloat fill[4];
for(int i=0;i<numComponents&&i<4;++i)
fill[i]=GLfloat(va_arg(ap,double));
va_end(ap);
GLfloat* buffer=new GLfloat[height*width*numComponents];
GLfloat* bPtr=buffer;
for(int y=0;y<height;++y)
for(int x=0;x<width;++x,bPtr+=numComponents)
for(int i=0;i<numComponents;++i)
bPtr[i]=fill[i];
return buffer;
}
}
/**************************************
Methods of class WaterTable2::DataItem:
**************************************/
WaterTable2::DataItem::DataItem(void)
:currentBathymetry(0),bathymetryVersion(0),currentQuantity(0),
derivativeTextureObject(0),waterTextureObject(0),
bathymetryFramebufferObject(0),derivativeFramebufferObject(0),maxStepSizeFramebufferObject(0),integrationFramebufferObject(0),waterFramebufferObject(0),
bathymetryShader(0),waterAdaptShader(0),derivativeShader(0),maxStepSizeShader(0),boundaryShader(0),eulerStepShader(0),rungeKuttaStepShader(0),waterAddShader(0),waterShader(0)
{
for(int i=0;i<2;++i)
{
bathymetryTextureObjects[i]=0;
maxStepSizeTextureObjects[i]=0;
}
for(int i=0;i<3;++i)
quantityTextureObjects[i]=0;
/* Initialize all required OpenGL extensions: */
GLARBDrawBuffers::initExtension();
GLARBFragmentShader::initExtension();
GLARBMultitexture::initExtension();
GLARBShaderObjects::initExtension();
GLARBTextureFloat::initExtension();
GLARBTextureRectangle::initExtension();
GLARBTextureRg::initExtension();
GLARBVertexShader::initExtension();
GLEXTFramebufferObject::initExtension();
}
WaterTable2::DataItem::~DataItem(void)
{
/* Delete all allocated shaders, textures, and buffers: */
glDeleteTextures(2,bathymetryTextureObjects);
glDeleteTextures(3,quantityTextureObjects);
glDeleteTextures(1,&derivativeTextureObject);
glDeleteTextures(2,maxStepSizeTextureObjects);
glDeleteTextures(1,&waterTextureObject);
glDeleteFramebuffersEXT(1,&bathymetryFramebufferObject);
glDeleteFramebuffersEXT(1,&derivativeFramebufferObject);
glDeleteFramebuffersEXT(1,&maxStepSizeFramebufferObject);
glDeleteFramebuffersEXT(1,&integrationFramebufferObject);
glDeleteFramebuffersEXT(1,&waterFramebufferObject);
glDeleteObjectARB(bathymetryShader);
glDeleteObjectARB(waterAdaptShader);
glDeleteObjectARB(derivativeShader);
glDeleteObjectARB(maxStepSizeShader);
glDeleteObjectARB(boundaryShader);
glDeleteObjectARB(eulerStepShader);
glDeleteObjectARB(rungeKuttaStepShader);
glDeleteObjectARB(waterAddShader);
glDeleteObjectARB(waterShader);
}
/****************************
Methods of class WaterTable2:
****************************/
void WaterTable2::calcTransformations(void)
{
/* Calculate the combined modelview and projection matrix to render depth images into the bathymetry grid: */
{
bathymetryPmv=PTransform::identity;
PTransform::Matrix& bpmvm=bathymetryPmv.getMatrix();
Scalar hw=Math::div2(cellSize[0]);
Scalar left=domain.min[0]+hw;
Scalar right=domain.max[0]-hw;
Scalar hh=Math::div2(cellSize[1]);
Scalar bottom=domain.min[1]+hh;
Scalar top=domain.max[1]-hh;
Scalar near=-domain.max[2];
Scalar far=-domain.min[2];
bpmvm(0,0)=Scalar(2)/(right-left);
bpmvm(0,3)=-(right+left)/(right-left);
bpmvm(1,1)=Scalar(2)/(top-bottom);
bpmvm(1,3)=-(top+bottom)/(top-bottom);
bpmvm(2,2)=Scalar(-2)/(far-near);
bpmvm(2,3)=-(far+near)/(far-near);
bathymetryPmv*=baseTransform;
}
/* Calculate the combined modelview and projection matrix to render water-adding geometry into the water texture: */
{
waterAddPmv=PTransform::identity;
PTransform::Matrix& wapmvm=waterAddPmv.getMatrix();
Scalar left=domain.min[0];
Scalar right=domain.max[0];
Scalar bottom=domain.min[1];
Scalar top=domain.max[1];
Scalar near=-domain.max[2]*Scalar(5);
Scalar far=-domain.min[2];
wapmvm(0,0)=Scalar(2)/(right-left);
wapmvm(0,3)=-(right+left)/(right-left);
wapmvm(1,1)=Scalar(2)/(top-bottom);
wapmvm(1,3)=-(top+bottom)/(top-bottom);
wapmvm(2,2)=Scalar(-2)/(far-near);
wapmvm(2,3)=-(far+near)/(far-near);
waterAddPmv*=baseTransform;
}
/* Convert the water addition matrix to column-major OpenGL format: */
GLfloat* wapPtr=waterAddPmvMatrix;
for(int j=0;j<4;++j)
for(int i=0;i<4;++i,++wapPtr)
*wapPtr=GLfloat(waterAddPmv.getMatrix()(i,j));
/* Calculate a transformation from camera space into water texture space: */
waterTextureTransform=PTransform::identity;
PTransform::Matrix& wttm=waterTextureTransform.getMatrix();
wttm(0,0)=Scalar(size[0])/(domain.max[0]-domain.min[0]);
wttm(0,3)=wttm(0,0)*-domain.min[0];
wttm(1,1)=Scalar(size[1])/(domain.max[1]-domain.min[1]);
wttm(1,3)=wttm(1,1)*-domain.min[1];
waterTextureTransform*=baseTransform;
/* Convert the water texture transform to column-major OpenGL format: */
GLfloat* wttmPtr=waterTextureTransformMatrix;
for(int j=0;j<4;++j)
for(int i=0;i<4;++i,++wttmPtr)
*wttmPtr=GLfloat(wttm(i,j));
}
GLfloat WaterTable2::calcDerivative(WaterTable2::DataItem* dataItem,GLuint quantityTextureObject,bool calcMaxStepSize) const
{
/*********************************************************************
Step 1: Calculate partial spatial derivatives, partial fluxes across
cell boundaries, and the temporal derivative.
*********************************************************************/
/* Set up the derivative computation frame buffer: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->derivativeFramebufferObject);
glViewport(0,0,size[0],size[1]);
/* Set up the temporal derivative computation shader: */
glUseProgramObjectARB(dataItem->derivativeShader);
glUniformARB<2>(dataItem->derivativeShaderUniformLocations[0],1,cellSize);
glUniformARB(dataItem->derivativeShaderUniformLocations[1],theta);
glUniformARB(dataItem->derivativeShaderUniformLocations[2],g);
glUniformARB(dataItem->derivativeShaderUniformLocations[3],epsilon);
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->bathymetryTextureObjects[dataItem->currentBathymetry]);
glUniform1iARB(dataItem->derivativeShaderUniformLocations[4],0);
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,quantityTextureObject);
glUniform1iARB(dataItem->derivativeShaderUniformLocations[5],1);
/* Run the temporal derivative computation: */
glBegin(GL_QUADS);
glVertex2i(0,0);
glVertex2i(size[0],0);
glVertex2i(size[0],size[1]);
glVertex2i(0,size[1]);
glEnd();
/* Unbind unneeded textures: */
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
/*********************************************************************
Step 2: Gather the maximum step size by reducing the maximum step size
texture.
*********************************************************************/
GLfloat stepSize=maxStepSize;
if(calcMaxStepSize)
{
/* Set up the maximum step size reduction shader: */
glUseProgramObjectARB(dataItem->maxStepSizeShader);
/* Bind the maximum step size computation frame buffer: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->maxStepSizeFramebufferObject);
/* Reduce the maximum step size texture in a sequence of half-reduction steps: */
int reducedWidth=size[0];
int reducedHeight=size[1];
int currentMaxStepSizeTexture=0;
while(reducedWidth>1||reducedHeight>1)
{
/* Set up the simulation frame buffer for maximum step size reduction: */
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT+(1-currentMaxStepSizeTexture));
/* Reduce the viewport by a factor of two: */
glViewport(0,0,(reducedWidth+1)/2,(reducedHeight+1)/2);
glUniformARB(dataItem->maxStepSizeShaderUniformLocations[0],GLfloat(reducedWidth-1),GLfloat(reducedHeight-1));
/* Bind the current max step size texture: */
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->maxStepSizeTextureObjects[currentMaxStepSizeTexture]);
glUniform1iARB(dataItem->maxStepSizeShaderUniformLocations[1],0);
/* Run the reduction step: */
glBegin(GL_QUADS);
glVertex2i(0,0);
glVertex2i(size[0],0);
glVertex2i(size[0],size[1]);
glVertex2i(0,size[1]);
glEnd();
/* Go to the next step: */
reducedWidth=(reducedWidth+1)/2;
reducedHeight=(reducedHeight+1)/2;
currentMaxStepSizeTexture=1-currentMaxStepSizeTexture;
}
/* Read the final value written into the last reduced 1x1 frame buffer: */
glReadBuffer(GL_COLOR_ATTACHMENT0_EXT+currentMaxStepSizeTexture);
glReadPixels(0,0,1,1,GL_LUMINANCE,GL_FLOAT,&stepSize);
/* Limit the step size to the client-specified range: */
stepSize=Math::min(stepSize,maxStepSize);
}
return stepSize;
}
WaterTable2::WaterTable2(GLsizei width,GLsizei height,const GLfloat sCellSize[2])
:depthImageRenderer(0),
baseTransform(ONTransform::identity),
dryBoundary(true),
readBathymetryRequest(0U),readBathymetryBuffer(0),readBathymetryReply(0U)
{
/* Initialize the water table size and cell size: */
size[0]=width;
size[1]=height;
for(int i=0;i<2;++i)
cellSize[i]=sCellSize[i];
/* Calculate a simulation domain: */
for(int i=0;i<2;++i)
{
domain.min[i]=Scalar(0);
domain.max[i]=Scalar(size[i])*Scalar(cellSize[i]);
}
/* Calculate the water table transformations: */
calcTransformations();
/* Initialize simulation parameters: */
theta=1.3f;
g=9.81f;
epsilon=0.01f*Math::max(Math::max(cellSize[0],cellSize[1]),1.0f);
attenuation=127.0f/128.0f; // 31.0f/32.0f;
maxStepSize=1.0f;
/* Initialize the water deposit amount: */
waterDeposit=0.0f;
}
WaterTable2::WaterTable2(GLsizei width,GLsizei height,const DepthImageRenderer* sDepthImageRenderer,const Point basePlaneCorners[4])
:depthImageRenderer(sDepthImageRenderer),
dryBoundary(true),
readBathymetryRequest(0U),readBathymetryBuffer(0),readBathymetryReply(0U)
{
/* Initialize the water table size: */
size[0]=width;
size[1]=height;
/* Project the corner points to the base plane and calculate their centroid: */
const Plane& basePlane=depthImageRenderer->getBasePlane();
Point bpc[4];
Point::AffineCombiner centroidC;
for(int i=0;i<4;++i)
{
bpc[i]=basePlane.project(basePlaneCorners[i]);
centroidC.addPoint(bpc[i]);
}
Point baseCentroid=centroidC.getPoint();
/* Calculate the transformation from camera space to upright elevation model space: */
typedef Point::Vector Vector;
Vector z=basePlane.getNormal();
Vector x=(bpc[1]-bpc[0])+(bpc[3]-bpc[2]);
Vector y=z^x;
baseTransform=ONTransform::translateFromOriginTo(baseCentroid);
baseTransform*=ONTransform::rotate(ONTransform::Rotation::fromBaseVectors(x,y));
baseTransform.doInvert();
/* Calculate the domain of upright elevation model space: */
domain=Box::empty;
for(int i=0;i<4;++i)
domain.addPoint(baseTransform.transform(bpc[i]));
domain.min[2]=Scalar(-20);
domain.max[2]=Scalar(100);
/* Calculate the grid's cell size: */
for(int i=0;i<2;++i)
cellSize[i]=GLfloat((domain.max[i]-domain.min[i])/Scalar(size[i]));
// DEBUGGING
// std::cout<<cellSize[0]<<" x "<<cellSize[1]<<std::endl;
/* Calculate the water table transformations: */
calcTransformations();
/* Initialize simulation parameters: */
theta=1.3f;
g=9.81f;
epsilon=0.01f*Math::max(Math::max(cellSize[0],cellSize[1]),1.0f);
attenuation=127.0f/128.0f; // 31.0f/32.0f;
maxStepSize=1.0f;
/* Initialize the water deposit amount: */
waterDeposit=0.0f;
}
WaterTable2::~WaterTable2(void)
{
}
void WaterTable2::initContext(GLContextData& contextData) const
{
/* Create a data item and add it to the context: */
DataItem* dataItem=new DataItem;
contextData.addDataItem(this,dataItem);
glActiveTextureARB(GL_TEXTURE0_ARB);
{
/* Create the vertex-centered bathymetry textures, replacing the outermost layer of cells with ghost cells: */
glGenTextures(2,dataItem->bathymetryTextureObjects);
GLfloat* b=makeBuffer(size[0]-1,size[1]-1,1,double(domain.min[2]));
for(int i=0;i<2;++i)
{
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->bathymetryTextureObjects[i]);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_T,GL_CLAMP);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB,0,GL_R32F,size[0]-1,size[1]-1,0,GL_LUMINANCE,GL_FLOAT,b);
}
delete[] b;
}
{
/* Create the cell-centered quantity state textures: */
glGenTextures(3,dataItem->quantityTextureObjects);
GLfloat* q=makeBuffer(size[0],size[1],3,double(domain.min[2]),0.0,0.0);
for(int i=0;i<3;++i)
{
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->quantityTextureObjects[i]);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_T,GL_CLAMP);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB,0,GL_RGB32F,size[0],size[1],0,GL_RGB,GL_FLOAT,q);
}
delete[] q;
}
{
/* Create the cell-centered temporal derivative texture: */
glGenTextures(1,&dataItem->derivativeTextureObject);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->derivativeTextureObject);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_T,GL_CLAMP);
GLfloat* qt=makeBuffer(size[0],size[1],3,0.0,0.0,0.0);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB,0,GL_RGB32F,size[0],size[1],0,GL_RGB,GL_FLOAT,qt);
delete[] qt;
}
{
/* Create the cell-centered maximum step size gathering textures: */
glGenTextures(2,dataItem->maxStepSizeTextureObjects);
GLfloat* mss=makeBuffer(size[0],size[1],1,10000.0);
for(int i=0;i<2;++i)
{
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->maxStepSizeTextureObjects[i]);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_T,GL_CLAMP);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB,0,GL_R32F,size[0],size[1],0,GL_LUMINANCE,GL_FLOAT,mss);
}
delete[] mss;
}
{
/* Create the cell-centered water texture: */
glGenTextures(1,&dataItem->waterTextureObject);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->waterTextureObject);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_T,GL_CLAMP);
GLfloat* w=makeBuffer(size[0],size[1],1,0.0);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB,0,GL_R32F,size[0],size[1],0,GL_LUMINANCE,GL_FLOAT,w);
delete[] w;
}
/* Protect the newly-created textures: */
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
/* Save the currently bound frame buffer: */
GLint currentFrameBuffer;
glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT,¤tFrameBuffer);
{
/* Create the bathymetry rendering frame buffer: */
glGenFramebuffersEXT(1,&dataItem->bathymetryFramebufferObject);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->bathymetryFramebufferObject);
/* Attach the bathymetry textures to the bathymetry rendering frame buffer: */
for(int i=0;i<2;++i)
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_EXT+i,GL_TEXTURE_RECTANGLE_ARB,dataItem->bathymetryTextureObjects[i],0);
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
}
{
/* Create the temporal derivative computation frame buffer: */
glGenFramebuffersEXT(1,&dataItem->derivativeFramebufferObject);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->derivativeFramebufferObject);
/* Attach the derivative and maximum step size textures to the temporal derivative computation frame buffer: */
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_EXT,GL_TEXTURE_RECTANGLE_ARB,dataItem->derivativeTextureObject,0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT1_EXT,GL_TEXTURE_RECTANGLE_ARB,dataItem->maxStepSizeTextureObjects[0],0);
GLenum drawBuffers[2]={GL_COLOR_ATTACHMENT0_EXT,GL_COLOR_ATTACHMENT1_EXT};
glDrawBuffersARB(2,drawBuffers);
glReadBuffer(GL_NONE);
}
{
/* Create the maximum step size computation frame buffer: */
glGenFramebuffersEXT(1,&dataItem->maxStepSizeFramebufferObject);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->maxStepSizeFramebufferObject);
/* Attach the maximum step size textures to the maximum step size computation frame buffer: */
for(int i=0;i<2;++i)
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_EXT+i,GL_TEXTURE_RECTANGLE_ARB,dataItem->maxStepSizeTextureObjects[i],0);
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
}
{
/* Create the integration step frame buffer: */
glGenFramebuffersEXT(1,&dataItem->integrationFramebufferObject);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->integrationFramebufferObject);
/* Attach the quantity textures to the integration step frame buffer: */
for(int i=0;i<3;++i)
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_EXT+i,GL_TEXTURE_RECTANGLE_ARB,dataItem->quantityTextureObjects[i],0);
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
}
{
/* Create the water frame buffer: */
glGenFramebuffersEXT(1,&dataItem->waterFramebufferObject);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->waterFramebufferObject);
/* Attach the water texture to the water frame buffer: */
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_EXT,GL_TEXTURE_RECTANGLE_ARB,dataItem->waterTextureObject,0);
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
glReadBuffer(GL_NONE);
}
/* Restore the previously bound frame buffer: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,currentFrameBuffer);
/* Create a simple vertex shader to render quads in pixel space: */
static const char* vertexShaderSourceTemplate="void main(){gl_Position=vec4(gl_Vertex.x*%f-1.0,gl_Vertex.y*%f-1.0,0.0,1.0);}";
char vertexShaderSource[256];
snprintf(vertexShaderSource,sizeof(vertexShaderSource),vertexShaderSourceTemplate,2.0/double(size[0]),2.0/double(size[1]));
/* Create the bathymetry update shader: */
{
GLhandleARB vertexShader=glCompileVertexShaderFromString(vertexShaderSource);
GLhandleARB fragmentShader=compileFragmentShader("Water2BathymetryUpdateShader");
dataItem->bathymetryShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->bathymetryShaderUniformLocations[0]=glGetUniformLocationARB(dataItem->bathymetryShader,"oldBathymetrySampler");
dataItem->bathymetryShaderUniformLocations[1]=glGetUniformLocationARB(dataItem->bathymetryShader,"newBathymetrySampler");
dataItem->bathymetryShaderUniformLocations[2]=glGetUniformLocationARB(dataItem->bathymetryShader,"quantitySampler");
}
/* Create the water adaptation shader: */
{
GLhandleARB vertexShader=glCompileVertexShaderFromString(vertexShaderSource);
GLhandleARB fragmentShader=compileFragmentShader("Water2WaterAdaptShader");
dataItem->waterAdaptShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->waterAdaptShaderUniformLocations[0]=glGetUniformLocationARB(dataItem->waterAdaptShader,"bathymetrySampler");
dataItem->waterAdaptShaderUniformLocations[1]=glGetUniformLocationARB(dataItem->waterAdaptShader,"newQuantitySampler");
}
/* Create the temporal derivative computation shader: */
{
GLhandleARB vertexShader=glCompileVertexShaderFromString(vertexShaderSource);
GLhandleARB fragmentShader=compileFragmentShader("Water2SlopeAndFluxAndDerivativeShader");
dataItem->derivativeShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->derivativeShaderUniformLocations[0]=glGetUniformLocationARB(dataItem->derivativeShader,"cellSize");
dataItem->derivativeShaderUniformLocations[1]=glGetUniformLocationARB(dataItem->derivativeShader,"theta");
dataItem->derivativeShaderUniformLocations[2]=glGetUniformLocationARB(dataItem->derivativeShader,"g");
dataItem->derivativeShaderUniformLocations[3]=glGetUniformLocationARB(dataItem->derivativeShader,"epsilon");
dataItem->derivativeShaderUniformLocations[4]=glGetUniformLocationARB(dataItem->derivativeShader,"bathymetrySampler");
dataItem->derivativeShaderUniformLocations[5]=glGetUniformLocationARB(dataItem->derivativeShader,"quantitySampler");
}
/* Create the maximum step size gathering shader: */
{
GLhandleARB vertexShader=glCompileVertexShaderFromString(vertexShaderSource);
GLhandleARB fragmentShader=compileFragmentShader("Water2MaxStepSizeShader");
dataItem->maxStepSizeShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->maxStepSizeShaderUniformLocations[0]=glGetUniformLocationARB(dataItem->maxStepSizeShader,"fullTextureSize");
dataItem->maxStepSizeShaderUniformLocations[1]=glGetUniformLocationARB(dataItem->maxStepSizeShader,"maxStepSizeSampler");
}
/* Create the boundary condition shader: */
{
GLhandleARB vertexShader=glCompileVertexShaderFromString(vertexShaderSource);
GLhandleARB fragmentShader=compileFragmentShader("Water2BoundaryShader");
dataItem->boundaryShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->boundaryShaderUniformLocations[0]=glGetUniformLocationARB(dataItem->boundaryShader,"bathymetrySampler");
}
/* Create the Euler integration step shader: */
{
GLhandleARB vertexShader=glCompileVertexShaderFromString(vertexShaderSource);
GLhandleARB fragmentShader=compileFragmentShader("Water2EulerStepShader");
dataItem->eulerStepShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->eulerStepShaderUniformLocations[0]=glGetUniformLocationARB(dataItem->eulerStepShader,"stepSize");
dataItem->eulerStepShaderUniformLocations[1]=glGetUniformLocationARB(dataItem->eulerStepShader,"attenuation");
dataItem->eulerStepShaderUniformLocations[2]=glGetUniformLocationARB(dataItem->eulerStepShader,"quantitySampler");
dataItem->eulerStepShaderUniformLocations[3]=glGetUniformLocationARB(dataItem->eulerStepShader,"derivativeSampler");
}
/* Create the Runge-Kutta integration step shader: */
{
GLhandleARB vertexShader=glCompileVertexShaderFromString(vertexShaderSource);
GLhandleARB fragmentShader=compileFragmentShader("Water2RungeKuttaStepShader");
dataItem->rungeKuttaStepShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->rungeKuttaStepShaderUniformLocations[0]=glGetUniformLocationARB(dataItem->rungeKuttaStepShader,"stepSize");
dataItem->rungeKuttaStepShaderUniformLocations[1]=glGetUniformLocationARB(dataItem->rungeKuttaStepShader,"attenuation");
dataItem->rungeKuttaStepShaderUniformLocations[2]=glGetUniformLocationARB(dataItem->rungeKuttaStepShader,"quantitySampler");
dataItem->rungeKuttaStepShaderUniformLocations[3]=glGetUniformLocationARB(dataItem->rungeKuttaStepShader,"quantityStarSampler");
dataItem->rungeKuttaStepShaderUniformLocations[4]=glGetUniformLocationARB(dataItem->rungeKuttaStepShader,"derivativeSampler");
}
/* Create the water adder rendering shader: */
{
GLhandleARB vertexShader=compileVertexShader("Water2WaterAddShader");
GLhandleARB fragmentShader=compileFragmentShader("Water2WaterAddShader");
dataItem->waterAddShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->waterAddShaderUniformLocations[0]=glGetUniformLocationARB(dataItem->waterAddShader,"pmv");
dataItem->waterAddShaderUniformLocations[1]=glGetUniformLocationARB(dataItem->waterAddShader,"stepSize");
dataItem->waterAddShaderUniformLocations[2]=glGetUniformLocationARB(dataItem->waterAddShader,"waterSampler");
}
/* Create the water shader: */
{
GLhandleARB vertexShader=glCompileVertexShaderFromString(vertexShaderSource);
GLhandleARB fragmentShader=compileFragmentShader("Water2WaterUpdateShader");
dataItem->waterShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->waterShaderUniformLocations[0]=glGetUniformLocationARB(dataItem->waterShader,"bathymetrySampler");
dataItem->waterShaderUniformLocations[1]=glGetUniformLocationARB(dataItem->waterShader,"quantitySampler");
dataItem->waterShaderUniformLocations[2]=glGetUniformLocationARB(dataItem->waterShader,"waterSampler");
}
}
void WaterTable2::setElevationRange(Scalar newMin,Scalar newMax)
{
/* Set the new elevation range: */
domain.min[2]=newMin;
domain.max[2]=newMax;
/* Recalculate the water table transformations: */
calcTransformations();
}
void WaterTable2::setAttenuation(GLfloat newAttenuation)
{
attenuation=newAttenuation;
}
void WaterTable2::setMaxStepSize(GLfloat newMaxStepSize)
{
maxStepSize=newMaxStepSize;
}
void WaterTable2::addRenderFunction(const AddWaterFunction* newRenderFunction)
{
/* Store the new render function: */
renderFunctions.push_back(newRenderFunction);
}
void WaterTable2::removeRenderFunction(const AddWaterFunction* removeRenderFunction)
{
/* Find the given render function in the list and remove it: */
for(std::vector<const AddWaterFunction*>::iterator rfIt=renderFunctions.begin();rfIt!=renderFunctions.end();++rfIt)
if(*rfIt==removeRenderFunction)
{
/* Remove the list element: */
renderFunctions.erase(rfIt);
break;
}
}
void WaterTable2::setWaterDeposit(GLfloat newWaterDeposit)
{
waterDeposit=newWaterDeposit;
}
void WaterTable2::setDryBoundary(bool newDryBoundary)
{
dryBoundary=newDryBoundary;
}
void WaterTable2::updateBathymetry(GLContextData& contextData) const
{
/* Get the data item: */
DataItem* dataItem=contextData.retrieveDataItem<DataItem>(this);
/* Check if the current bathymetry texture is outdated: */
if(dataItem->bathymetryVersion!=depthImageRenderer->getDepthImageVersion())
{
/* Save relevant OpenGL state: */
glPushAttrib(GL_VIEWPORT_BIT);
GLint currentFrameBuffer;
glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT,¤tFrameBuffer);
GLfloat currentClearColor[4];
glGetFloatv(GL_COLOR_CLEAR_VALUE,currentClearColor);
/* Bind the bathymetry rendering frame buffer and clear it: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->bathymetryFramebufferObject);
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT+(1-dataItem->currentBathymetry));
glViewport(0,0,size[0]-1,size[1]-1);
glClearColor(GLfloat(domain.min[2]),0.0f,0.0f,1.0f);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
/* Render the surface into the bathymetry grid: */
depthImageRenderer->renderElevation(bathymetryPmv,contextData);
/* Set up the integration frame buffer to update the conserved quantities based on bathymetry changes: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->integrationFramebufferObject);
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT+(1-dataItem->currentQuantity));
glViewport(0,0,size[0],size[1]);
/* Set up the bathymetry update shader: */
glUseProgramObjectARB(dataItem->bathymetryShader);
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->bathymetryTextureObjects[dataItem->currentBathymetry]);
glUniform1iARB(dataItem->bathymetryShaderUniformLocations[0],0);
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->bathymetryTextureObjects[1-dataItem->currentBathymetry]);
glUniform1iARB(dataItem->bathymetryShaderUniformLocations[1],1);
/* Check if the current bathymetry grid was requested: */
if(readBathymetryReply!=readBathymetryRequest)
{
/* Read back the bathymetry grid into the supplied buffer: */
glGetTexImage(GL_TEXTURE_RECTANGLE_ARB,0,GL_RED,GL_FLOAT,readBathymetryBuffer);
/* Finish the request: */
readBathymetryReply=readBathymetryRequest;
}
glActiveTextureARB(GL_TEXTURE2_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->quantityTextureObjects[dataItem->currentQuantity]);
glUniform1iARB(dataItem->bathymetryShaderUniformLocations[2],2);
/* Run the bathymetry update: */
glBegin(GL_QUADS);
glVertex2i(0,0);
glVertex2i(size[0],0);
glVertex2i(size[0],size[1]);
glVertex2i(0,size[1]);
glEnd();
/* Unbind all shaders and textures: */
glUseProgramObjectARB(0);
glActiveTextureARB(GL_TEXTURE2_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
/* Restore OpenGL state: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,currentFrameBuffer);
glClearColor(currentClearColor[0],currentClearColor[1],currentClearColor[2],currentClearColor[3]);
glPopAttrib();
/* Update the bathymetry and quantity grids: */
dataItem->currentBathymetry=1-dataItem->currentBathymetry;
dataItem->bathymetryVersion=depthImageRenderer->getDepthImageVersion();
dataItem->currentQuantity=1-dataItem->currentQuantity;
}
}
void WaterTable2::updateBathymetry(const GLfloat* bathymetryGrid,GLContextData& contextData) const
{
/* Get the data item: */
DataItem* dataItem=contextData.retrieveDataItem<DataItem>(this);
/* Set up the integration frame buffer to update the conserved quantities based on bathymetry changes: */
glPushAttrib(GL_VIEWPORT_BIT);
GLint currentFrameBuffer;
glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT,¤tFrameBuffer);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->integrationFramebufferObject);
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT+(1-dataItem->currentQuantity));
glViewport(0,0,size[0],size[1]);
/* Set up the bathymetry update shader: */
glUseProgramObjectARB(dataItem->bathymetryShader);
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->bathymetryTextureObjects[dataItem->currentBathymetry]);
glUniform1iARB(dataItem->bathymetryShaderUniformLocations[0],0);
/* Upload the new bathymetry grid: */
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->bathymetryTextureObjects[1-dataItem->currentBathymetry]);
glUniform1iARB(dataItem->bathymetryShaderUniformLocations[1],1);
glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB,0,0,0,size[0]-1,size[1]-1,GL_LUMINANCE,GL_FLOAT,bathymetryGrid);
glActiveTextureARB(GL_TEXTURE2_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->quantityTextureObjects[dataItem->currentQuantity]);
glUniform1iARB(dataItem->bathymetryShaderUniformLocations[2],2);
/* Run the bathymetry update: */
glBegin(GL_QUADS);
glVertex2i(0,0);
glVertex2i(size[0],0);
glVertex2i(size[0],size[1]);
glVertex2i(0,size[1]);
glEnd();
/* Unbind all shaders and textures: */
glActiveTextureARB(GL_TEXTURE2_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
glUseProgramObjectARB(0);
/* Restore OpenGL state: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,currentFrameBuffer);
glPopAttrib();
/* Update the bathymetry and quantity grids: */
dataItem->currentBathymetry=1-dataItem->currentBathymetry;
dataItem->currentQuantity=1-dataItem->currentQuantity;
}
void WaterTable2::setWaterLevel(const GLfloat* waterGrid,GLContextData& contextData) const
{
/* Get the data item: */
DataItem* dataItem=contextData.retrieveDataItem<DataItem>(this);
/* Set up the integration frame buffer to adapt the new water level to the current bathymetry: */
glPushAttrib(GL_VIEWPORT_BIT);
GLint currentFrameBuffer;
glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT,¤tFrameBuffer);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->integrationFramebufferObject);
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT+(1-dataItem->currentQuantity));
glViewport(0,0,size[0],size[1]);
/* Bind the water adaptation shader: */
glUseProgramObjectARB(dataItem->waterAdaptShader);
/* Bind the current bathymetry texture: */
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->bathymetryTextureObjects[dataItem->currentBathymetry]);
glUniform1iARB(dataItem->waterAdaptShaderUniformLocations[0],0);
/* Bind the current quantity texture: */
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->quantityTextureObjects[dataItem->currentQuantity]);
glUniform1iARB(dataItem->waterAdaptShaderUniformLocations[1],1);
/* Upload the new water level texture: */
glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB,0,0,0,size[0],size[1],GL_RED,GL_FLOAT,waterGrid);
/* Run the water adaptation shader: */
glBegin(GL_QUADS);
glVertex2i(0,0);
glVertex2i(size[0],0);
glVertex2i(size[0],size[1]);
glVertex2i(0,size[1]);
glEnd();
/* Unbind all shaders and textures: */
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
glUseProgramObjectARB(0);
/* Restore OpenGL state: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,currentFrameBuffer);
glPopAttrib();
/* Update the quantity grid: */
dataItem->currentQuantity=1-dataItem->currentQuantity;
}
GLfloat WaterTable2::runSimulationStep(bool forceStepSize,GLContextData& contextData) const
{
/* Get the data item: */
DataItem* dataItem=contextData.retrieveDataItem<DataItem>(this);
/* Save relevant OpenGL state: */
glPushAttrib(GL_COLOR_BUFFER_BIT|GL_VIEWPORT_BIT);
GLint currentFrameBuffer;
glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT,¤tFrameBuffer);
/*********************************************************************
Step 1: Calculate temporal derivative of most recent quantities.
*********************************************************************/
GLfloat stepSize=calcDerivative(dataItem,dataItem->quantityTextureObjects[dataItem->currentQuantity],!forceStepSize);
/*********************************************************************
Step 2: Perform the tentative Euler integration step.
*********************************************************************/
/* Set up the Euler step integration frame buffer: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->integrationFramebufferObject);
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT+2);
glViewport(0,0,size[0],size[1]);
/* Set up the Euler integration step shader: */
glUseProgramObjectARB(dataItem->eulerStepShader);
glUniformARB(dataItem->eulerStepShaderUniformLocations[0],stepSize);
glUniformARB(dataItem->eulerStepShaderUniformLocations[1],Math::pow(attenuation,stepSize));
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->quantityTextureObjects[dataItem->currentQuantity]);
glUniform1iARB(dataItem->eulerStepShaderUniformLocations[2],0);
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->derivativeTextureObject);
glUniform1iARB(dataItem->eulerStepShaderUniformLocations[3],1);
/* Run the Euler integration step: */
glBegin(GL_QUADS);
glVertex2i(0,0);
glVertex2i(size[0],0);
glVertex2i(size[0],size[1]);
glVertex2i(0,size[1]);
glEnd();
/*********************************************************************
Step 3: Calculate temporal derivative of intermediate quantities.
*********************************************************************/
calcDerivative(dataItem,dataItem->quantityTextureObjects[2],false);
/*********************************************************************
Step 4: Perform the final Runge-Kutta integration step.
*********************************************************************/
/* Set up the Runge-Kutta step integration frame buffer: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->integrationFramebufferObject);
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT+(1-dataItem->currentQuantity));
glViewport(0,0,size[0],size[1]);
/* Set up the Runge-Kutta integration step shader: */
glUseProgramObjectARB(dataItem->rungeKuttaStepShader);
glUniformARB(dataItem->rungeKuttaStepShaderUniformLocations[0],stepSize);
glUniformARB(dataItem->rungeKuttaStepShaderUniformLocations[1],Math::pow(attenuation,stepSize));
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->quantityTextureObjects[dataItem->currentQuantity]);
glUniform1iARB(dataItem->rungeKuttaStepShaderUniformLocations[2],0);
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->quantityTextureObjects[2]);
glUniform1iARB(dataItem->rungeKuttaStepShaderUniformLocations[3],1);
glActiveTextureARB(GL_TEXTURE2_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->derivativeTextureObject);
glUniform1iARB(dataItem->rungeKuttaStepShaderUniformLocations[4],2);
/* Run the Runge-Kutta integration step: */
glBegin(GL_QUADS);
glVertex2i(0,0);
glVertex2i(size[0],0);
glVertex2i(size[0],size[1]);
glVertex2i(0,size[1]);
glEnd();
if(dryBoundary)
{
/* Set up the boundary condition shader to enforce dry boundaries: */
glUseProgramObjectARB(dataItem->boundaryShader);
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->bathymetryTextureObjects[dataItem->currentBathymetry]);
glUniform1iARB(dataItem->boundaryShaderUniformLocations[0],0);
/* Run the boundary condition shader on the outermost layer of pixels: */
//glColorMask(GL_TRUE,GL_FALSE,GL_FALSE,GL_FALSE);
glBegin(GL_LINE_LOOP);
glVertex2f(0.5f,0.5f);
glVertex2f(GLfloat(size[0])-0.5f,0.5f);
glVertex2f(GLfloat(size[0])-0.5f,GLfloat(size[1])-0.5f);
glVertex2f(0.5f,GLfloat(size[1])-0.5f);
glEnd();
//glColorMask(GL_TRUE,GL_TRUE,GL_TRUE,GL_TRUE);
}
/* Update the current quantities: */
dataItem->currentQuantity=1-dataItem->currentQuantity;
if(waterDeposit!=0.0f||!renderFunctions.empty())
{
/* Save OpenGL state: */
GLfloat currentClearColor[4];
glGetFloatv(GL_COLOR_CLEAR_VALUE,currentClearColor);