-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathindex_tran.html
405 lines (296 loc) · 12 KB
/
index_tran.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
<html>
<head>
<title>ICG WebGL — HW1</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript" src="./js/glMatrix-0.9.5.min.js"></script>
<script type="text/javascript" src="./js/webgl-utils.js"></script>
<!--
TODO HERE:
modify fragment shader or write another one
to implement flat, gouraud and phong shading
-->
<script id="fragmentShader" type="fragment">
precision mediump float;
varying vec3 mvNormal;
varying vec3 mvVertex;
varying vec3 forntColor;
void main(void) {
vec3 light = vec3(30,20,-25);
vec3 lightColor = vec3(1.0, 0.0, 0.0);
vec3 light1 = vec3(-30,20,-25);
vec3 lightColor1 = vec3(1.0, 0.0, 0.0);
vec3 light2 = vec3(0,20,-25);
vec3 lightColor2 = vec3(1.0, 0.0, 0.0);
// V,N,L,H (都要是單位向量)
vec3 V = -normalize(mvVertex);
vec3 N = normalize(mvNormal);
vec3 L = normalize(light - mvVertex);
vec3 H = normalize(L+V);
vec3 L1 = normalize(light1 - mvVertex);
vec3 H1 = normalize(L1+V);
vec3 L2 = normalize(light2 - mvVertex);
vec3 H2 = normalize(L2+V);
//參數可以自由調整，表示三種light 的比重
float ka = 0.5;
float kd = 0.2;
float ks = 0.3;
// gouraud = ambient + diffuse + specular （需要三種光源）
vec3 ambient = lightColor * ka * forntColor;
// diffuse light for three light sources
float cos = max(dot(L, N), 0.0); // 得到 L 和 N 的夾角。避免負數
vec3 diffuse = lightColor * kd * cos * forntColor;
float cos1 = max(dot(L1, N), 0.0); // 得到 L 和 N 的夾角。避免負數
vec3 diffuse1 = lightColor1 * kd * cos1 * forntColor;
float cos2 = max(dot(L2, N), 0.0); // 得到 L 和 N 的夾角。避免負數
vec3 diffuse2 = lightColor2 * kd * cos2 * forntColor;
// specular light for three light sources
float cosAlpha = max(dot(H, N), 0.0);
vec3 specular = lightColor * ks * pow(cosAlpha, 16.0); //次方可以自己調整
if(dot(L, N)<0.0){
specular = vec3(0.0);
}
float cosAlpha1 = max(dot(H1, N), 0.0);
vec3 specular1 = lightColor1 * ks * pow(cosAlpha1, 16.0); //次方可以自己調整
if(dot(L1, N)<0.0){
specular1 = vec3(0.0);
}
float cosAlpha2 = max(dot(H2, N), 0.0);
vec3 specular2 = lightColor2 * ks * pow(cosAlpha2, 16.0); //次方可以自己調整
if(dot(L2, N)<0.0){
specular2 = vec3(0.0);
}
vec3 phong = vec3(0.0); //把vector 三個數值都設為0
phong = ambient + diffuse + diffuse1 + diffuse2
+ specular + specular1 + specular2;
gl_FragColor = vec4(phong, 1.0);
}
</script>
<!--
TODO HERE:
modify vertex shader or write another one
to implement flat, gouraud and phong shading
NOTE:
if you want to write bonus part (texture mapping),
only Teapot.json has extra attribute "vertexTextureCoords"
which is used for texture mappping.
-->
<script id="vertexShader" type="vertex">
attribute vec3 aVertexPosition;
attribute vec3 aFrontColor;
attribute vec3 aVertexNormal;
uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;
varying vec3 mvNormal;
varying vec3 mvVertex;
varying vec3 forntColor;
void main(void) {
mvVertex = (uMVMatrix * vec4(aVertexPosition, 1.0)).xyz;
mat3 normalMatrix = mat3(uMVMatrix);
mvNormal = (normalMatrix * aVertexNormal);
forntColor = aFrontColor;
gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
}
</script>
<script type="text/javascript">
// common variables
var gl;
var shaderProgram;
var mvMatrix = mat4.create();
var pMatrix = mat4.create();
var teapotVertexPositionBuffer;
var teapotVertexNormalBuffer;
var teapotVertexFrontColorBuffer;
var KangarooVertexPositionBuffer;
var KangarooVertexNormalBuffer;
var KangarooVertexFrontColorBuffer;
var teapotAngle = 180;
var KangarooAngle = 180;
var lastTime = 0;
function initGL(canvas) {
try {
gl = canvas.getContext("webgl") || 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 shaderSource = "";
var k = shaderScript.firstChild;
while (k) {
if (k.nodeType == 3) {
shaderSource += k.textContent;
}
k = k.nextSibling;
}
var shader;
if (shaderScript.type == "fragment") {
shader = gl.createShader(gl.FRAGMENT_SHADER);
}
else if (shaderScript.type == "vertex") {
shader = gl.createShader(gl.VERTEX_SHADER);
}
else {
return null;
}
gl.shaderSource(shader, shaderSource);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
alert(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
function initShaders() {
var fragmentShader = getShader(gl, "fragmentShader");
var vertexShader = getShader(gl, "vertexShader");
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.vertexFrontColorAttribute = gl.getAttribLocation(shaderProgram, "aFrontColor");
gl.enableVertexAttribArray(shaderProgram.vertexFrontColorAttribute);
shaderProgram.vertexNormalAttribute = gl.getAttribLocation(shaderProgram, "aVertexNormal");
gl.enableVertexAttribArray(shaderProgram.vertexNormalAttribute);
shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
}
function setMatrixUniforms() {
gl.uniformMatrix4fv(shaderProgram.pMatrixUniform, false, pMatrix);
gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix);
}
function degToRad(degrees) {
return degrees * Math.PI / 180;
}
function handleLoadedTeapot(teapotData) {
teapotVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexPositionBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(teapotData.vertexPositions), gl.STATIC_DRAW);
teapotVertexPositionBuffer.itemSize = 3;
teapotVertexPositionBuffer.numItems = teapotData.vertexPositions.length / 3;
teapotVertexNormalBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexNormalBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(teapotData.vertexNormals), gl.STATIC_DRAW);
teapotVertexNormalBuffer.itemSize = 3;
teapotVertexNormalBuffer.numItems = teapotData.vertexNormals.length / 3;
teapotVertexFrontColorBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexFrontColorBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(teapotData.vertexFrontcolors), gl.STATIC_DRAW);
teapotVertexFrontColorBuffer.itemSize = 3;
teapotVertexFrontColorBuffer.numItems = teapotData.vertexFrontcolors.length / 3;
}
function loadTeapot(modelFile) {
var request = new XMLHttpRequest();
request.open("GET", "./model/"+modelFile);
request.onreadystatechange = function () {
if (request.readyState == 4) {
handleLoadedTeapot(JSON.parse(request.responseText));
}
}
request.send();
}
/*
TODO HERE:
add two or more objects showing on the canvas
(it needs at least three objects showing at the same time)
*/
function drawScene() {
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
if (teapotVertexPositionBuffer == null ||
teapotVertexNormalBuffer == null ||
teapotVertexFrontColorBuffer == null) {
return;
}
// Setup Projection Matrix
mat4.perspective(45, gl.viewportWidth / gl.viewportHeight, 0.1, 100.0, pMatrix);
// Setup Model-View Matrix
mat4.identity(mvMatrix);
mat4.translate(mvMatrix, [0, 0, -60]);
mat4.rotate(mvMatrix, degToRad(teapotAngle), [0, 1, 0]);
setMatrixUniforms();
// Setup teapot position data
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexPositionBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute,
teapotVertexPositionBuffer.itemSize,
gl.FLOAT,
false,
0,
0);
// Setup teapot front color data
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexFrontColorBuffer);
gl.vertexAttribPointer(shaderProgram.vertexFrontColorAttribute,
teapotVertexFrontColorBuffer.itemSize,
gl.FLOAT,
false,
0,
0);
// Setup teapot front normal data
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexNormalBuffer);
gl.vertexAttribPointer(shaderProgram.vertexNormalAttribute,
teapotVertexNormalBuffer.itemSize,
gl.FLOAT,
false,
0,
0);
gl.drawArrays(gl.TRIANGLES, 0, teapotVertexPositionBuffer.numItems);
// Setup Model-View Matrix
mat4.identity(mvMatrix);
mat4.translate(mvMatrix, [40, 0, -80]);
mat4.rotate(mvMatrix, degToRad(teapotAngle), [0, 1, 0]); //
mat4.scale(mvMatrix, [1,1,1])
mat4.shear(mvMatrix, [0, 45, 0]); //y, x, z
setMatrixUniforms();
gl.drawArrays(gl.TRIANGLES, 0, teapotVertexPositionBuffer.numItems);
// Setup Model-View Matrix
mat4.identity(mvMatrix);
mat4.translate(mvMatrix, [-40, 0, -80]);
mat4.rotate(mvMatrix, degToRad(teapotAngle), [0, 1, 0]); //
mat4.scale(mvMatrix, [1,2,1])
mat4.shear(mvMatrix, [0, 0, 0]); //x, y, z
setMatrixUniforms();
gl.drawArrays(gl.TRIANGLES, 0, teapotVertexPositionBuffer.numItems);
}
function animate() {
var timeNow = new Date().getTime();
if (lastTime != 0) {
var elapsed = timeNow - lastTime;
teapotAngle += 0.03 * elapsed;
}
lastTime = timeNow;
}
function tick() {
requestAnimFrame(tick);
drawScene();
animate();
}
function webGLStart() {
var canvas = document.getElementById("ICG-canvas");
initGL(canvas);
initShaders();
loadTeapot('Teapot.json');
gl.clearColor(0.0, 0.2, 0.2, 1.0);
gl.enable(gl.DEPTH_TEST);
tick();
}
</script>
</head>
<body onload="webGLStart();">
<canvas id="ICG-canvas" style="border: none;" width="1280" height="720"></canvas>
<br/>
</body>
</html>