多视角3D逼真HTML5水波动画_html5教程技巧

在线预览 源码下载

HTML代码

XML/HTML Code复制内容到剪贴板

1. <img id="tiles" src="tiles.jpg">
2. <img id="xneg" src="xneg.jpg">
3. <img id="xpos" src="xpos.jpg">
4. <img id="ypos" src="ypos.jpg">
5. <img id="zneg" src="zneg.jpg">
6. <img id="zpos" src="zpos.jpg">

Javascript代码

Javascript Code复制内容到剪贴板

1. function Water() {
2. var vertexShader = '\
3. varying vec2 coord;\
4. void main() {\
5. coord = gl_Vertex.xy * 0.5 + 0.5;\
6. gl_Position = vec4(gl_Vertex.xyz, 1.0);\
7. }\
8. ';
9. this.plane = GL.Mesh.plane();
10. if (!GL.Texture.canUseFloatingPointTextures()) {
11. throw new Error('This demo requires the OES_texture_float extension');
12. }
13. var filter = GL.Texture.canUseFloatingPointLinearFiltering() ? gl.LINEAR : gl.NEAREST;
14. this.textureA = new GL.Texture(256, 256, { type: gl.FLOAT, filter: filter });
15. this.textureB = new GL.Texture(256, 256, { type: gl.FLOAT, filter: filter });
16. this.dropShader = new GL.Shader(vertexShader, '\
17. const float PI = 3.141592653589793;\
18. uniform sampler2D texture;\
19. uniform vec2 center;\
20. uniform float radius;\
21. uniform float strength;\
22. varying vec2 coord;\
23. void main() {\
24. /* get vertex info */\
25. vec4 info = texture2D(texture, coord);\
26. \
27. /* add the drop to the height */\
28. float drop = max(0.0, 1.0 - length(center * 0.5 + 0.5 - coord) / radius);\
29. drop = 0.5 - cos(drop * PI) * 0.5;\
30. info.r += drop * strength;\
31. \
32. gl_FragColor = info;\
33. }\
34. ');
35. this.updateShader = new GL.Shader(vertexShader, '\
36. uniform sampler2D texture;\
37. uniform vec2 delta;\
38. varying vec2 coord;\
39. void main() {\
40. /* get vertex info */\
41. vec4 info = texture2D(texture, coord);\
42. \
43. /* calculate average neighbor height */\
44. vec2 dx = vec2(delta.x, 0.0);\
45. vec2 dy = vec2(0.0, delta.y);\
46. float average = (\
47. texture2D(texture, coord - dx).r +\
48. texture2D(texture, coord - dy).r +\
49. texture2D(texture, coord + dx).r +\
50. texture2D(texture, coord + dy).r\
51. ) * 0.25;\
52. \
53. /* change the velocity to move toward the average */\
54. info.g += (average - info.r) * 2.0;\
55. \
56. /* attenuate the velocity a little so waves do not last forever */\
57. info.g *= 0.995;\
58. \
59. /* move the vertex along the velocity */\
60. info.r += info.g;\
61. \
62. gl_FragColor = info;\
63. }\
64. ');
65. this.normalShader = new GL.Shader(vertexShader, '\
66. uniform sampler2D texture;\
67. uniform vec2 delta;\
68. varying vec2 coord;\
69. void main() {\
70. /* get vertex info */\
71. vec4 info = texture2D(texture, coord);\
72. \
73. /* update the normal */\
74. vec3 dx = vec3(delta.x, texture2D(texture, vec2(coord.x + delta.x, coord.y)).r - info.r, 0.0);\
75. vec3 dy = vec3(0.0, texture2D(texture, vec2(coord.x, coord.y + delta.y)).r - info.r, delta.y);\
76. info.ba = normalize(cross(dy, dx)).xz;\
77. \
78. gl_FragColor = info;\
79. }\
80. ');
81. this.sphereShader = new GL.Shader(vertexShader, '\
82. uniform sampler2D texture;\
83. uniform vec3 oldCenter;\
84. uniform vec3 newCenter;\
85. uniform float radius;\
86. varying vec2 coord;\
87. \
88. float volumeInSphere(vec3 center) {\
89. vec3 toCenter = vec3(coord.x * 2.0 - 1.0, 0.0, coord.y * 2.0 - 1.0) - center;\
90. float t = length(toCenter) / radius;\
91. float dy = exp(-pow(t * 1.5, 6.0));\
92. float ymin = min(0.0, center.y - dy);\
93. float ymax = min(max(0.0, center.y + dy), ymin + 2.0 * dy);\
94. return (ymax - ymin) * 0.1;\
95. }\
96. \
97. void main() {\
98. /* get vertex info */\
99. vec4 info = texture2D(texture, coord);\
100. \
101. /* add the old volume */\
102. info.r += volumeInSphere(oldCenter);\
103. \
104. /* subtract the new volume */\
105. info.r -= volumeInSphere(newCenter);\
106. \
107. gl_FragColor = info;\
108. }\
109. ');
110. }
112. Water.prototype.addDrop = function(x, y, radius, strength) {
113. var this_ = this;
114. this.textureB.drawTo(function() {
115. this_.textureA.bind();
116. this_.dropShader.uniforms({
117. center: [x, y],
118. radius: radius,
119. strength: strength
120. }).draw(this_.plane);
121. });
122. this.textureB.swapWith(this.textureA);
123. };
125. Water.prototype.moveSphere = function(oldCenter, newCenter, radius) {
126. var this_ = this;
127. this.textureB.drawTo(function() {
128. this_.textureA.bind();
129. this_.sphereShader.uniforms({
130. oldCenter: oldCenter,
131. newCenter: newCenter,
132. radius: radius
133. }).draw(this_.plane);
134. });
135. this.textureB.swapWith(this.textureA);
136. };
138. Water.prototype.stepSimulation = function() {
139. var this_ = this;
140. this.textureB.drawTo(function() {
141. this_.textureA.bind();
142. this_.updateShader.uniforms({
143. delta: [1 / this_.textureA.width, 1 / this_.textureA.height]
144. }).draw(this_.plane);
145. });
146. this.textureB.swapWith(this.textureA);
147. };
149. Water.prototype.updateNormals = function() {
150. var this_ = this;
151. this.textureB.drawTo(function() {
152. this_.textureA.bind();
153. this_.normalShader.uniforms({
154. delta: [1 / this_.textureA.width, 1 / this_.textureA.height]
155. }).draw(this_.plane);
156. });
157. this.textureB.swapWith(this.textureA);
158. };

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