-
Notifications
You must be signed in to change notification settings - Fork 0
/
index.html
executable file
·1098 lines (960 loc) · 33.4 KB
/
index.html
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
<html>
<head>
<title>Civ 6: sphere tesselation by hexagons</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
<script type="text/javascript" src="webgl-utils.js"></script>
<script type="text/javascript" src="primitives.js"></script>
<script id="shader-fs" type="x-shader/x-fragment">
precision mediump float;
varying vec3 vColor;
varying vec2 vTexCoord;
varying float vSelected;
varying float vRenderType;
uniform sampler2D uSampler;
uniform bool uAllBlack;
// uniform int uRenderType;
void main(void) {
if(uAllBlack) {
gl_FragColor = vec4(0.4, 0.4, 0.4, 1.0);
} else if(vRenderType > 1.9 && vRenderType < 2.1) {
gl_FragColor = texture2D(uSampler, vTexCoord);
if(vSelected > 0.5) {
gl_FragColor.xyz *= 1.8*vSelected;
}
} else {
gl_FragColor = vec4(vColor.rgb,1.0);
if(vSelected > 0.5) {
gl_FragColor.xyz *= 1.8*vSelected;
}
}
}
</script>
<script id="shader-vs" type="x-shader/x-vertex">
# define M_PI 3.1415926535
attribute vec3 aVertexPosition;
attribute vec3 aColor;
attribute vec3 aNormal;
attribute vec2 aTexCoord;
attribute float aSelected;
varying vec3 vColor;
varying vec2 vTexCoord;
varying float vSelected;
varying float vRenderType;
uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;
uniform mat3 uNMatrix;
uniform vec3 uLightingDirection;
uniform vec3 uDiffuseColor;
uniform float uDiffuseAmount;
uniform vec3 uAmbientColor;
uniform float uAmbientAmount;
uniform bool uAllBlack;
uniform int uRenderType;
void main(void) {
// set the point size (for helper points)
gl_PointSize = 3.0;
// map stuff using MVP
gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
vec3 n = uNMatrix * aNormal;
// evaluate lighting
normalize(uLightingDirection);
vec3 diffuse = max(dot(n,uLightingDirection), 0.0) * uDiffuseColor;
vec3 ambient = uAmbientAmount * uAmbientColor;
// pass values on
vTexCoord = aTexCoord;
vSelected = aSelected;
vRenderType = float(uRenderType);
if(uAllBlack) {
vColor = vec3(0,0,0);
gl_Position[2] -= 1e-4;
} else {
if(uRenderType == 1) {
vColor = .5*aNormal+.5;
} else {
vColor = (diffuse + ambient) * aColor;
}
}
}
</script>
<script type="text/javascript">
var selectionSize = 3;
function Polygon(pts) {
this.pts = pts;
this.nor = vec3.create();
this.selected = 0;
this.neighbours = [];
this.contains = contains;
this.setSelected = setSelected;
this.centroid = vec3.create();
var k=0;
for(var i=0; i<pts.length/3; i++) {
this.centroid[0] += pts[k++];
this.centroid[1] += pts[k++];
this.centroid[2] += pts[k++];
}
this.centroid[0] /= pts.length/3;
this.centroid[1] /= pts.length/3;
this.centroid[2] /= pts.length/3;
vec3.normalize(this.centroid, this.nor);
var c = new Vertex(this.centroid[0], this.centroid[1], this.centroid[2]);
var n = new Vertex(this.nor[0], this.nor[1], this.nor[2]);
var d = c.dot(n);
if(d<0) {
// alert("normal pointing the wrong way!");
// document.write("<br>normal pointing the wrong way!<br>");
}
// document.write("<br>" + this.nor[0] + ", " + this.nor[1] + ", " + this.nor[2]);
/*
for (var i in this.pts) {
document.write( this.pts[i] + ", ");
if(i%3 == 2)
document.write("<br>");
}
document.write("<br>");
document.write("<br>");
*/
function contains(p) {
var sides = this.pts.length/3;
for(var i=0; i<sides; i++) {
var p1 = vec3.create([this.pts[i*3], this.pts[i*3+1], this.pts[i*3+2]]);
var p2 = vec3.create([this.pts[(i+1)%sides*3], this.pts[(i+1)%sides*3+1], this.pts[(i+1)%sides*3+2]]);
var cross = vec3.create();
vec3.subtract(p2, p1);
vec3.subtract(p1, p);
vec3.scale(p1, -1.0);
vec3.cross(p2, p1, cross);
if(vec3.dot(cross, this.nor) < 0)
return false;
}
return true;
}
function setSelected(n) {
this.selected = n;
for(var i in this.neighbours)
if(this.neighbours[i].selected < n-1)
this.neighbours[i].setSelected(n-1);
}
}
var gl;
function initGL(canvas) {
try {
gl = canvas.getContext("experimental-webgl");
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
} catch (e) {
}
if (!gl) {
alert("Could not initialise WebGL, sorry :-(");
}
}
function getShader(gl, id) {
var shaderScript = document.getElementById(id);
if (!shaderScript) {
return null;
}
var str = "";
var k = shaderScript.firstChild;
while (k) {
if (k.nodeType == 3) {
str += k.textContent;
}
k = k.nextSibling;
}
var shader;
if (shaderScript.type == "x-shader/x-fragment") {
shader = gl.createShader(gl.FRAGMENT_SHADER);
} else if (shaderScript.type == "x-shader/x-vertex") {
shader = gl.createShader(gl.VERTEX_SHADER);
} else {
return null;
}
gl.shaderSource(shader, str);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
alert(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
var shaderProgram;
function initShaders() {
var fragmentShader = getShader(gl, "shader-fs");
var vertexShader = getShader(gl, "shader-vs");
shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
alert("Could not initialise shaders");
}
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);
shaderProgram.colorAttribute = gl.getAttribLocation(shaderProgram, "aColor");
gl.enableVertexAttribArray(shaderProgram.colorAttribute);
shaderProgram.normalAttribute = gl.getAttribLocation(shaderProgram, "aNormal");
gl.enableVertexAttribArray(shaderProgram.normalAttribute);
shaderProgram.selectedAttribute = gl.getAttribLocation(shaderProgram, "aSelected");
gl.enableVertexAttribArray(shaderProgram.selectedAttribute);
shaderProgram.texCoordAttribute = gl.getAttribLocation(shaderProgram, "aTexCoord");
gl.enableVertexAttribArray(shaderProgram.texCoordAttribute);
shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
shaderProgram.nMatrixUniform = gl.getUniformLocation(shaderProgram, "uNMatrix");
shaderProgram.allBlackUniform = gl.getUniformLocation(shaderProgram, "uAllBlack");
shaderProgram.renderTypeUniform = gl.getUniformLocation(shaderProgram, "uRenderType");
shaderProgram.lightDirectionUniform = gl.getUniformLocation(shaderProgram, "uLightingDirection");
shaderProgram.diffuseAmountUniform = gl.getUniformLocation(shaderProgram, "uDiffuseAmount");
shaderProgram.ambientAmountUniform = gl.getUniformLocation(shaderProgram, "uAmbientAmount");
shaderProgram.diffuseColorUniform = gl.getUniformLocation(shaderProgram, "uDiffuseColor");
shaderProgram.ambientColorUniform = gl.getUniformLocation(shaderProgram, "uAmbientColor");
shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, "uSampler");
}
var mvMatrix = mat4.create();
var pMatrix = mat4.create();
var normalMatrix = mat3.create();
function setMatrixUniforms() {
gl.uniformMatrix4fv(shaderProgram.pMatrixUniform, false, pMatrix);
gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix);
mat4.toInverseMat3(mvMatrix, normalMatrix);
mat3.transpose(normalMatrix);
gl.uniformMatrix3fv(shaderProgram.nMatrixUniform, false, normalMatrix);
}
function sign(x) {
if(x < 0) return -1;
else if(x > 0) return 1;
else return 0;
}
var vertexPositionBuffer;
var colorBuffer;
var normalBuffer;
var faceIndexBuffer;
var lineIndexBuffer;
var selectedBuffer;
var helperPositionBuffer = null;
function initBuffers() {
var vertices = [];
var color = [];
var normal = [];
var fIndices = [];
var lIndices = [];
var texCoords= [];
var globI = 0;
for(var i in polygons) {
var sides = polygons[i].pts.length/3;
var textureWrap = false;
for(var j=0; j<sides; j++) {
var x = polygons[i].pts[3*j];
var y = polygons[i].pts[3*j+1];
var z = polygons[i].pts[3*j+2];
if(x<0 && sign(y)!=sign(polygons[i].pts[1]))
textureWrap = true;
}
for(var j=0; j<sides; j++) {
var x = polygons[i].pts[3*j];
var y = polygons[i].pts[3*j+1];
var z = polygons[i].pts[3*j+2];
vertices.push(x);
vertices.push(y);
vertices.push(z);
if(sides == 5) {
color.push(.9); color.push(.14); color.push(.14);
} else if(sides == 6) {
color.push(.8); color.push(.85); color.push(.1);
} else {
color.push(1); color.push(0); color.push(0);
}
normal.push(polygons[i].nor[0]);
normal.push(polygons[i].nor[1]);
normal.push(polygons[i].nor[2]);
var r = Math.sqrt(x*x+y*y);
var theta = Math.atan2(y,x)+Math.PI;
var phi = Math.atan2(r,z);
if(textureWrap && y < 0)
texCoords.push((theta+2*Math.PI) / 2.0 / Math.PI);
else
texCoords.push(theta / 2.0 / Math.PI);
texCoords.push(phi / 1.0 / Math.PI);
}
for(var j=0; j<sides-2; j++) {
fIndices.push(globI + 0);
fIndices.push(globI + j+1);
fIndices.push(globI + j+2);
}
for(var j=0; j<sides; j++) {
lIndices.push(globI + j );
lIndices.push(globI + (j+1)%sides);
}
globI += sides;
}
vertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexPositionBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
vertexPositionBuffer.itemSize = 3;
vertexPositionBuffer.numItems = vertices.length/3;
colorBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(color), gl.STATIC_DRAW);
colorBuffer.itemSize = 3;
colorBuffer.numItems = color.length/3;
normalBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, normalBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(normal), gl.STATIC_DRAW);
normalBuffer.itemSize = 3;
normalBuffer.numItems = normal.length/3;
texCoordBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, texCoordBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(texCoords), gl.STATIC_DRAW);
texCoordBuffer.itemSize = 2;
texCoordBuffer.numItems = texCoords.length/2;
faceIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, faceIndexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(fIndices), gl.STATIC_DRAW);
faceIndexBuffer.itemSize = 1;
faceIndexBuffer.numItems = fIndices.length;
lineIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, lineIndexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(lIndices), gl.STATIC_DRAW);
lineIndexBuffer.itemSize = 1;
lineIndexBuffer.numItems = lIndices.length;
updateBuffer();
}
function updateBuffer() {
var selected = [];
for(var i in polygons) {
var sides = polygons[i].pts.length/3;
for(var j=0; j<sides; j++)
selected.push(polygons[i].selected);
}
selectedBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, selectedBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(selected), gl.STATIC_DRAW);
selectedBuffer.itemSize = 1;
selectedBuffer.numItems = selected.length;
}
function initLigthing() {
var ambientAmount = 0.15
var ambientColor = vec3.create([1.0, 1.0, 1.0]);
var diffuseAmount = 0.35
var diffuseColor = vec3.create([0.7, 0.7, 0.7]);
var lightDir = vec3.create([ 1.0, 1.0, 1.0]);
vec3.normalize(lightDir);
gl.uniform3fv(shaderProgram.lightDirectionUniform, lightDir);
gl.uniform3fv(shaderProgram.ambientColorUniform, ambientColor);
gl.uniform3fv(shaderProgram.diffuseColorUniform, diffuseColor);
gl.uniform1f(shaderProgram.diffuseAmountUniform, diffuseAmount);
gl.uniform1f(shaderProgram.ambientAmountUniform, ambientAmount);
}
var worldTexture;
function initTextures() {
worldTexture = gl.createTexture();
worldTexture.image = new Image();
worldTexture.image.onload = function() {
handleLoadedTexture(worldTexture);
}
worldTexture.image.src = "world1024.png";
}
function handleLoadedTexture(texture) {
gl.bindTexture(gl.TEXTURE_2D, texture);
// gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, texture.image);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.bindTexture(gl.TEXTURE_2D, null);
}
function setTerrainData(img) {
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
var img = document.getElementById('myimg');
context.drawImage(img, 0, 0 );
var myData = context.getImageData(0, 0, img.width, img.height);
}
var camR = 7.0;
var camPhi = Math.PI / 2;
var camTheta = 0.00;
var camAngle = 20;
function drawScene() {
// clear scene
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
// setup camera
mat4.perspective(camAngle, gl.viewportWidth / gl.viewportHeight, 0.1, 100.0, pMatrix);
mat4.identity(mvMatrix);
mat4.translate(mvMatrix, [0.0, 0.0, -camR]);
mat4.rotate(mvMatrix, -camPhi, [1.0, 0.0, 0.0]);
mat4.rotateZ(mvMatrix, -camTheta);
mat4.rotateZ(mvMatrix, -Math.PI/2);
// set color
gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
gl.vertexAttribPointer(shaderProgram.colorAttribute, colorBuffer.itemSize, gl.FLOAT, false, 0, 0);
// set position
gl.bindBuffer(gl.ARRAY_BUFFER, vertexPositionBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, vertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
// set normals
gl.bindBuffer(gl.ARRAY_BUFFER, normalBuffer);
gl.vertexAttribPointer(shaderProgram.normalAttribute, normalBuffer.itemSize, gl.FLOAT, false, 0, 0);
// set selection information
gl.bindBuffer(gl.ARRAY_BUFFER, selectedBuffer);
gl.vertexAttribPointer(shaderProgram.selectedAttribute, selectedBuffer.itemSize, gl.FLOAT, false, 0, 0);
// set texture
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, worldTexture);
gl.uniform1i(shaderProgram.samplerUniform, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, texCoordBuffer);
gl.vertexAttribPointer(shaderProgram.texCoordAttribute, texCoordBuffer.itemSize, gl.FLOAT, false, 0, 0);
// push matrices
setMatrixUniforms();
// draw faces
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, faceIndexBuffer);
gl.uniform1f(shaderProgram.allBlackUniform, false);
gl.drawElements(gl.TRIANGLES, faceIndexBuffer.numItems, gl.UNSIGNED_SHORT, 0);
// draw edges
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, lineIndexBuffer);
gl.uniform1f(shaderProgram.allBlackUniform, true);
gl.drawElements(gl.LINES, lineIndexBuffer.numItems, gl.UNSIGNED_SHORT, 0);
// draw helper points
if(helperPositionBuffer != null) {
gl.bindBuffer(gl.ARRAY_BUFFER, helperPositionBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, helperPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.POINTS, 0, helperPositionBuffer.numItems);
}
}
var lastTime = 0;
function animate() {
var nowTime = new Date().getTime();
if (lastTime != 0) {
var elapsed = nowTime - lastTime;
// camTheta += 2*Math.PI*elapsed / 9000.0;
}
// camPhi = (Math.sin(nowTime / 7000.0)+1)*Math.PI*.35;
camPhi -= deltaMouseY * .003;
camTheta -= deltaMouseX * .003;
if(camPhi >= Math.PI)
camPhi = Math.PI - 1e-3;
else if(camPhi < 0)
camPhi = 1e-3;
if(mouseDown) {
lastMouseX += deltaMouseX;
lastMouseY += deltaMouseY;
deltaMouseX = 0;
deltaMouseY = 0;
}
lastTime = nowTime;
}
var polygons = [];
var vertices = [];
var faces = [];
var geosidicFace = [];
var edges = [];
function initDodecahedron() {
var phi = (1+Math.sqrt(5.0))/2.0;
var pts = [ 1.0, 1.0, 1.0,
1.0,-1.0, 1.0,
1.0, 1.0,-1.0,
1.0,-1.0,-1.0,
-1.0, 1.0, 1.0, // pts[4]
-1.0,-1.0, 1.0,
-1.0, 1.0,-1.0,
-1.0,-1.0,-1.0,
0, 1.0/phi, phi, // pts[8]
0,-1.0/phi, phi,
0, 1.0/phi,-phi,
0,-1.0/phi,-phi,
1.0/phi, phi, 0, // pts[12]
-1.0/phi, phi, 0,
1.0/phi, -phi, 0,
-1.0/phi, -phi, 0,
phi, 0, 1.0/phi, //pts[16]
phi, 0, -1.0/phi,
-phi, 0, 1.0/phi,
-phi, 0, -1.0/phi];
var indx = [15, 14, 3, 11, 7,
14, 3, 17, 16, 1,
17, 16, 0, 12, 2,
3, 17, 2, 10, 11,
7, 11, 10, 6, 19,
10, 2, 12, 13, 6,
1, 9, 8, 0, 16,
9, 5, 18, 4, 8,
8, 4, 13, 12, 0,
5, 15, 7, 19, 18,
4, 18, 19, 6, 13,
15, 5, 9, 1, 14];
for(var i=0; i<indx.length/5; i++) {
var locPt = [];
for(var j=0; j<5; j++) {
var k = indx[i*5+j];
locPt.push(pts[3*k ]);
locPt.push(pts[3*k+1]);
locPt.push(pts[3*k+2]);
}
polygons.push(new Polygon(locPt));
}
}
function initIcosahedron() {
vertices = [];
faces = [];
edges = [];
var phi = (1+Math.sqrt(5.0))/2.0;
var pts = [ 0, 1, phi,
0, -1, phi,
0, 1, -phi,
0, -1, -phi,
1, phi, 0,
-1, phi, 0,
1, -phi, 0,
-1, -phi, 0,
phi, 0, 1,
-phi, 0, 1,
phi, 0, -1,
-phi, 0, -1];
var indx = [0, 8, 1, 0, 1, 9, 0, 4, 8, 0, 5, 4,
0, 9, 5, 2, 11, 3, 2, 5, 11, 2, 4, 5,
2, 10, 4, 2, 3, 10, 1, 7, 9, 1, 6, 7,
1, 8, 6, 3, 6, 10, 3, 7, 6, 3, 11, 7,
4, 10, 8, 5, 9, 11, 6, 8, 10, 7, 11, 9];
for(var i=0; i<pts.length/3; i++)
vertices.push(new Vertex(pts[3*i], pts[3*i+1], pts[3*i+2]));
for(var i=0; i<indx.length/3; i++) {
var locPt = [];
var locVert = [];
for(var j=0; j<3; j++) {
var k = indx[i*3+j];
locPt.push(pts[3*k ]);
locPt.push(pts[3*k+1]);
locPt.push(pts[3*k+2]);
locVert.push(vertices[k]);
}
// polygons.push(new Polygon(locPt));
var f = new Face(locVert);
faces.push(f);
var newE;
for(var j=0; j<3; j++) {
newE = new Edge(locVert[j], locVert[(j+1)%3]);
newE.face.push(f);
var found = false;
for(var k in edges) {
if(newE.equals(edges[k])) {
newE = edges[k];
newE.face.push(f);
found = true;
break;
}
}
if(!found)
edges.push(newE);
f.edge.push(newE);
}
}
/* debugging output
for(var i in faces) {
document.write("<br>Face #"+i+":");
for(var j in faces[i].edge) {
var edgeI = -1;
for(var k in edges)
if(faces[i].edge[j].equals(edges[k]))
edgeI = k;
document.write("<br>    edge #"+edgeI+": ");
var ptI = -1;
for(var k in vertices)
if(faces[i].edge[j].vertex[0].equals(vertices[k]))
ptI = k;
document.write(ptI + ", ");
for(var k in vertices)
if(faces[i].edge[j].vertex[1].equals(vertices[k]))
ptI = k;
document.write("" + ptI);
if(faces[i].edge[j].face[1].equals(faces[i]))
document.write(" (-1)");
}
}
*/
}
function makeGeosidic(n,m) {
geosidicFace = [];
// make sure n is always the biggest number
if(n < m) {
tmp = m; m = n; n = tmp;
}
if(m == 0) { // paralell type subdivision
for(var i in edges) {
for(var t=1; t<n; t++) {
var p1 = edges[i].vertex[0].mult(1.0*(n-t)/n);
var p2 = edges[i].vertex[1].mult(1.0*( t )/n);
var p = p1.add(p2);
edges[i].intVertices.push(p);
vertices.push(p);
}
}
for(var i in faces) {
for(var t=1; t<n-1; t++) {
for(var s=1; s<n-t; s++) {
var z1 = 1.0*t/n;
var z2 = 1.0*s/n;
var z3 = 1.0 - z1 - z2;
var p1 = faces[i].vertices[0].mult(z1);
var p2 = faces[i].vertices[1].mult(z2);
var p3 = faces[i].vertices[2].mult(z3);
var pp = p1.add(p2);
var p = pp.add(p3); // p = z1*p1 + z2*p2 + z3*p3
faces[i].intVertices.push(p);
vertices.push(p);
}
}
var e1 = faces[i].edge[0];
var e2 = faces[i].edge[1];
var e3 = faces[i].edge[2];
var e1Reverse = e1.face[1].equals(faces[i]);
var e2Reverse = e2.face[1].equals(faces[i]);
var e3Reverse = e3.face[1].equals(faces[i]);
var locSize = n+1;
var locVertices = [faces[i].vertices[2]];
for(var j=0; j<n-1; j++)
locVertices.push(e2.intVertices[(e2Reverse)?j:(n-j-2)]);
locVertices.push(faces[i].vertices[1])
for(var j=0; j<n-1; j++) {
locI = ((locSize+1)*locSize - (locSize-j)*(locSize-j-1))/2;
locVertices[locI] = e3.intVertices[(e3Reverse)?(n-j-2):j];
}
locI = 2*locSize-2;
for(var j=0; j<n-1; j++) {
locVertices[locI] = e1.intVertices[(e1Reverse)?j:(n-j-2)];
locI += locSize-j-2;
}
var locI = locSize+1;
var st = 0;
for(var j=1; j<locSize-2; j++) {
for(var k=1; k<locSize-1-j; k++) {
locVertices[locI] = faces[i].intVertices[st++];
locI++;
}
locI+=2;
}
locVertices.push(faces[i].vertices[0]);
st = 0;
for(var j=0; j<locSize-1; j++) {
for(var k=0; k<locSize-1-j; k++) {
geosidicFace.push(new Face([locVertices[ st ],
locVertices[ st+(locSize-j)],
locVertices[ st+1 ]]));
st++;
}
st++;
}
st = locSize;
for(var j=1; j<locSize; j++) {
for(var k=0; k<locSize-1-j; k++) {
geosidicFace.push(new Face([locVertices[ st ],
locVertices[ st+1 ],
locVertices[ st-locSize+j]]));
st++;
}
st++;
}
}
// polygons = [];
// for(var i in geosidicFace)
// polygons.push(new Polygon(geosidicFace[i].getVertexList()));
} else if(m == n) { // reflexible type
} else { // chirall patterns
}
}
function projectSphere() {
for(var i in vertices) {
vertices[i].normalize();
// document.write("<br>vertex #" + i + " has lenght " + vertices[i].len());
}
// polygons = [];
// for(var i in geosidicFace)
// polygons.push(new Polygon(geosidicFace[i].getVertexList()));
}
function makeDualMesh() {
var finalVert = [];
var finalFace = [];
// list all vertices face neighbours (dual mesh face circumference)
for(var i in geosidicFace) {
for(var j in geosidicFace[i].vertices)
geosidicFace[i].vertices[j].addFace(i);
finalVert.push(geosidicFace[i].getCentroid());
}
// list all vertex-vertex neighbours (dual mesh polygon-connectivity)
for(var i in vertices)
vertices[i].index = i;
for(var i in geosidicFace) {
for(var j=0; j<geosidicFace[i].vertices.length; j++) {
for(var k=j+1; k<geosidicFace[i].vertices.length; k++) {
var v1 = geosidicFace[i].vertices[j];
var v2 = geosidicFace[i].vertices[k];
v1.addVertex(v2.index);
v2.addVertex(v1.index);
}
}
}
// make polygons of all vertices
for(var i in vertices) {
var locVert = [];
for(var j in vertices[i].face)
locVert.push(finalVert[vertices[i].face[j]]);
if(locVert.length>2) {
var newF = new Face(locVert);
newF.reorganizePoints();
finalFace.push(newF);
}
}
polygons = [];
for(var i in finalFace)
polygons.push(new Polygon(finalFace[i].getVertexList()));
for(var i in vertices)
for(var j in vertices[i].vertex)
polygons[i].neighbours.push(polygons[vertices[i].vertex[j]]);
}
function tick() {
requestAnimFrame(tick);
drawScene();
animate();
}
/*******************************************************************/
/*********** USER INPUT FUNCTIONS **********/
/*******************************************************************/
var mouseDown = false;
var lastMousePress = null;
var lastMouseX = null;
var lastMouseY = null;
var deltaMouseX = 0;
var deltaMouseY = 0;
function click(x,y) {
var p = getPointAt(x, y);
for(var i in polygons)
polygons[i].selected = 0;
if(p == null) {
helperPositionBuffer = null;
} else {
var p1 = vec3.create([polygons[0].pts[0], polygons[0].pts[1], polygons[0].pts[2]]);
var p2 = vec3.create([polygons[0].pts[6], polygons[0].pts[7], polygons[0].pts[8]]);
vec3.subtract(p1,p2);
var h = vec3.length(p1);
// alert("p1 = " + vec3.str(p1) + "\np2=" + vec3.str(p2) + "\ncharacteristic length = " + h);
var hits = 0;
for(var i in polygons) {
vec3.subtract(polygons[i].centroid, p, p1);
if(vec3.length(p1) < 3*h)
if(polygons[i].contains(p))
polygons[i].setSelected(selectionSize);
}
// alert(hits + " number of polygons hits within 3 times this limit");
// alert(hits + " number of polygons hits containing this point");
/*
vec3.scale(p, 1.002);
var vertices = [p[0], p[1], p[2], 1.2,0,0, 0,1.2, 0, 0,0,1.2];
helperPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, helperPositionBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
helperPositionBuffer.itemSize = 3;
helperPositionBuffer.numItems = 4;
*/
}
updateBuffer();
}
function press(x,y) {
mouseDown = true;
lastMousePress = new Date().getTime();
lastMouseX = x;
lastMouseY = y;
deltaMouseX = 0;
deltaMouseY = 0;
}
function release(x,y) {
mouseDown = false
var nowTime = new Date().getTime();
if(nowTime - lastMousePress < 250)
click(x,y);
}
function drag(x,y) {
if(!mouseDown) return;
var newX = x;
var newY = y;
deltaMouseX = (newX - lastMouseX);
deltaMouseY = (newY - lastMouseY);
}
function wheel(n) { // scroll down is positive n
// alert("Mouse wheel " + n + " clicks");
camAngle += n;
camAngle = (camAngle>40) ? 40 : camAngle;
camAngle = (camAngle<5) ? 5 : camAngle;
}
function getPointAt(x, y) {
var w = gl.viewportWidth;
var h = gl.viewportHeight;
var alpha = 2.0*(x-w/2.0)/w * camAngle / 360.0 * Math.PI;
var beta = 2.0*(h/2.0-y)/h * camAngle / 360.0 * Math.PI;
var cam = vec3.create([camR*Math.cos(camTheta)*Math.sin(camPhi),
camR*Math.sin(camTheta)*Math.sin(camPhi),
camR*Math.cos(camPhi)]);
var dir = vec3.create();
vec3.scale(cam, -1.0, dir);
vec3.normalize(dir);
// create the camera-scene ray for intersection purposes
var rot = mat4.create();
mat4.identity(rot);
mat4.rotate(rot, Math.PI/2, [-cam[1], cam[0], 0.0]);
var u = vec3.create();
var v = vec3.create();
mat4.multiplyVec3(rot, dir, u);
vec3.cross(dir, u, v); // [u,v,dir] forms a basis for the screen plane in physical coordinates
mat4.identity(rot);
mat4.rotate(rot, beta, v);
mat4.rotate(rot, -alpha, u);
mat4.multiplyVec3(rot, dir); // dir is now rotated to go through the right pixel point
// solve a quadratic system to get the intersections with the sphere
var a = vec3.dot(dir,dir);
var b = vec3.dot(cam,dir)*2;
var c = vec3.dot(cam,cam) - 1;
if(4*a*c > b*b)
return null;
// the result is given as result = cam + t*dir
var t = (-b - Math.sqrt(b*b-4*a*c))/2.0/a;
var result = vec3.create();
vec3.scale(dir, t, result);
vec3.add(result, cam);
return result;
// alert("x="+x+"\ny="+y+"\nw="+w+"\nh="+h+"\ncamera: " + vec3.str(cam) + "\nlooking: " + vec3.str(dir) + "\nalpha=" + alpha + "\nbeta=" + beta + "\na=" + a + "\nb=" + b + "\nc=" + c + "\nsqrt = " + (b*b-4*a*c) + "\nHit: " + vec3.str(result) + "\nu="+vec3.str(u)+"\nv="+vec3.str(v));
}
function changeSize() {
var newSize = parseInt(document.getElementById("inputSize").value);
if(isNaN(newSize))
return;
if(newSize < 2 || newSize > 33) {
alert("Size must be between 2 and 33");
return;
}
initIcosahedron();
makeGeosidic(newSize,0);
projectSphere();
makeDualMesh();
initBuffers();
initTextures();
}
function changeSelection() {
var newSize = parseInt(document.getElementById("selectSize").value);
if(isNaN(newSize))
return;
if(newSize < 1 || newSize > 30) {
alert("Selection size must be between 1 and 30");
return;
}
selectionSize = newSize;
}
function changeRender(type) {
if(type == "Earth")
gl.uniform1i(shaderProgram.renderTypeUniform, 2);
else if(type == "Type")
gl.uniform1i(shaderProgram.renderTypeUniform, 3);
else if(type == "Terrain")
gl.uniform1i(shaderProgram.renderTypeUniform, 1);
}
/*******************************************************************/
/*********** MOUSE INPUT **********/
/*******************************************************************/
function handleMouseDown(event) {
press(event.pageX-canvasX, event.pageY-canvasY);
}
function handleMouseUp(event) {
release(event.pageX-canvasX, event.pageY-canvasY);
}
function handleMouseMove(event) {
drag(event.pageX-canvasX, event.pageY-canvasY);
}
function handleMouseWheel(event) {
wheel(-event.wheelDelta/120);
event.preventDefault();
}
function handleMouseWheelFireFox(event) {
wheel(event.detail/3);
event.preventDefault();
}
/*******************************************************************/
/*********** TOUCHSCREEN INPUT **********/
/*******************************************************************/
function handleTouchDown(event) {
if(event.touches.length != 1) return;
press(event.touches[0].pageX-canvasX, event.touches[0].pageY-canvasY);