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
|
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>WebGL Experiment | Vibes</title>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=VT323&family=Fredoka:wght@400;600&display=swap"
rel="stylesheet">
<script src="https://cdn.usefathom.com/script.js" data-site="YZVJPTBZ" defer></script>
<style>
body {
margin: 0;
padding: 0;
overflow: hidden;
background: linear-gradient(135deg, #7873f5, #ff6ec4);
font-family: 'Fredoka', sans-serif;
color: #fff;
}
canvas {
display: block;
width: 100vw;
height: 100vh;
position: fixed;
top: 0;
left: 0;
z-index: -1;
}
.controls {
position: absolute;
bottom: 20px;
left: 20px;
background-color: rgba(255, 255, 255, 0.2);
padding: 15px;
border-radius: 15px;
backdrop-filter: blur(5px);
z-index: 10;
display: flex;
flex-direction: column;
gap: 10px;
border: 3px dashed #c1a5e8;
box-shadow: 5px 5px 0px rgba(0, 0, 0, 0.2);
}
.control-group {
display: flex;
align-items: center;
gap: 10px;
}
label {
font-family: 'VT323', monospace;
font-size: 1.2rem;
min-width: 120px;
}
input[type="range"] {
width: 150px;
accent-color: #c1a5e8;
}
button {
background: #c1a5e8;
border: none;
padding: 8px 15px;
border-radius: 8px;
font-family: 'VT323', monospace;
font-size: 1.2rem;
cursor: pointer;
transition: all 0.2s ease;
color: #5a3d5c;
border: 2px solid #5a3d5c;
margin-top: 10px;
}
button:hover {
background: #d4c1f0;
transform: translateY(-2px);
}
.info {
position: absolute;
top: 20px;
right: 20px;
background-color: rgba(255, 255, 255, 0.2);
padding: 15px;
border-radius: 15px;
backdrop-filter: blur(5px);
z-index: 10;
border: 3px dashed #c1a5e8;
box-shadow: 5px 5px 0px rgba(0, 0, 0, 0.2);
font-family: 'VT323', monospace;
font-size: 1.2rem;
text-align: right;
}
.home-link {
position: absolute;
top: 20px;
left: 20px;
background-color: rgba(255, 255, 255, 0.2);
padding: 10px 15px;
border-radius: 15px;
backdrop-filter: blur(5px);
z-index: 10;
border: 3px dashed #c1a5e8;
box-shadow: 5px 5px 0px rgba(0, 0, 0, 0.2);
font-family: 'VT323', monospace;
font-size: 1.2rem;
text-decoration: none;
color: #fff;
transition: all 0.2s ease;
}
.home-link:hover {
background-color: rgba(255, 255, 255, 0.3);
transform: translateY(-2px);
}
</style>
</head>
<body>
<canvas id="webglCanvas"></canvas>
<a href="../" class="home-link">← Back to Vibes</a>
<script>
function initTopoShader() {
const canvas = document.getElementById("webglCanvas");
if (!canvas) {
console.error(
"TopoShader: Canvas element #webglCanvas not found!",
);
return;
}
// Request WebGL2 context directly
const gl = canvas.getContext("webgl2");
if (!gl) {
console.error(
"TopoShader: WebGL2 not supported or context creation failed! This demo requires WebGL2.",
);
canvas.style.display = "none"; // Hide canvas if WebGL2 is not available
const fallbackMessage = document.createElement("p");
fallbackMessage.textContent =
"WebGL2 is required for this animation but is not supported by your browser or hardware.";
fallbackMessage.style.color = "white";
fallbackMessage.style.textAlign = "center";
fallbackMessage.style.padding = "20px";
// Insert before the canvas or at the top of body
if (canvas.parentNode) {
canvas.parentNode.insertBefore(fallbackMessage, canvas);
} else {
document.body.insertBefore(
fallbackMessage,
document.body.firstChild,
);
}
return;
}
console.log("TopoShader: Using WebGL2 context.");
// --- Vertex Shader (WebGL2 syntax) ---
const vsSource = `\
#version 300 es
in vec4 a_position;
void main() {
gl_Position = a_position;
}
`;
const fsSource = `\
#version 300 es
precision highp float;
out vec4 out_FragColor;
uniform vec2 u_resolution;
uniform float u_time;
// --- Simplex Noise (snoise) ---
// (Full snoise function code)
vec3 mod289(vec3 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
vec4 mod289(vec4 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
vec4 permute(vec4 x) { return mod289(((x*34.0)+10.0)*x); }
vec4 taylorInvSqrt(vec4 r) { return 1.79284291400159 - 0.85373472095314 * r; }
float snoise(vec3 v) {
const vec2 C = vec2(1.0/6.0, 1.0/3.0) ; const vec4 D = vec4(0.0, 0.5, 1.0, 2.0);
vec3 i = floor(v + dot(v, C.yyy) ); vec3 x0 = v - i + dot(i, C.xxx);
vec3 g = step(x0.yzx, x0.xyz); vec3 l = 1.0 - g; vec3 i1 = min( g.xyz, l.zxy ); vec3 i2 = max( g.xyz, l.zxy );
vec3 x1 = x0 - i1 + C.xxx; vec3 x2 = x0 - i2 + C.yyy; vec3 x3 = x0 - D.yyy;
i = mod289(i);
vec4 p = permute( permute( permute( i.z + vec4(0.0, i1.z, i2.z, 1.0 )) + i.y + vec4(0.0, i1.y, i2.y, 1.0 )) + i.x + vec4(0.0, i1.x, i2.x, 1.0 ));
float n_ = 0.142857142857; vec3 ns = n_ * D.wyz - D.xzx;
vec4 j = p - 49.0 * floor(p * ns.z * ns.z);
vec4 x_ = floor(j * ns.z); vec4 y_ = floor(j - 7.0 * x_ );
vec4 x = x_ *ns.x + ns.yyyy; vec4 y = y_ *ns.x + ns.yyyy; vec4 h = 1.0 - abs(x) - abs(y);
vec4 b0 = vec4( x.xy, y.xy ); vec4 b1 = vec4( x.zw, y.zw );
vec4 s0 = floor(b0)*2.0 + 1.0; vec4 s1 = floor(b1)*2.0 + 1.0; vec4 sh = -step(h, vec4(0.0));
vec4 a0 = b0.xzyw + s0.xzyw*sh.xxyy ; vec4 a1 = b1.xzyw + s1.xzyw*sh.zzww ;
vec3 p0 = vec3(a0.xy,h.x); vec3 p1 = vec3(a0.zw,h.y); vec3 p2 = vec3(a1.xy,h.z); vec3 p3 = vec3(a1.zw,h.w);
vec4 norm = taylorInvSqrt(vec4(dot(p0,p0), dot(p1,p1), dot(p2, p2), dot(p3,p3)));
p0 *= norm.x; p1 *= norm.y; p2 *= norm.z; p3 *= norm.w;
vec4 m = max(0.5 - vec4(dot(x0,x0), dot(x1,x1), dot(x2,x2), dot(x3,x3)), 0.0);
m = m * m;
return 105.0 * dot( m*m, vec4( dot(p0,x0), dot(p1,x1), dot(p2,x2), dot(p3,x3) ) );
}
// --- Colormap Function ---
vec3 colormap_clean(float t) {
t = clamp(t, 0.0, 1.0); // Ensure t is in [0,1]
// Palette: ["#ffbe0b","#fb5607","#ff006e","#8338ec","#3a86ff"]
vec3 color1 = vec3(1.000, 0.745, 0.043); // #ffbe0b (Yellow)
vec3 color2 = vec3(0.984, 0.337, 0.027); // #fb5607 (Orange)
vec3 color3 = vec3(1.000, 0.000, 0.431); // #ff006e (Pink/Magenta)
vec3 color4 = vec3(0.514, 0.220, 0.925); // #8338ec (Purple)
vec3 color5 = vec3(0.227, 0.525, 1.000); // #3a86ff (Blue)
// We have 5 colors, so 4 segments for interpolation.
// Each segment will take up 1.0 / 4.0 = 0.25 of the range.
float segment_length = 0.25; // 1.0 / (number of colors - 1)
if (t < segment_length) { // 0.0 to 0.25
return mix(color1, color2, t / segment_length);
} else if (t < segment_length * 2.0) { // 0.25 to 0.50
return mix(color2, color3, (t - segment_length) / segment_length);
} else if (t < segment_length * 3.0) { // 0.50 to 0.75
return mix(color3, color4, (t - segment_length * 2.0) / segment_length);
} else { // 0.75 to 1.0
return mix(color4, color5, (t - segment_length * 3.0) / segment_length);
}
}
void main() {
vec2 fragCoord_scaled = gl_FragCoord.xy * (0.003 * 1.5);
float time_scaled = u_time * 0.025;
vec3 noise_input = vec3(fragCoord_scaled, time_scaled);
float noise_val = snoise(noise_input);
noise_val = (noise_val + 1.0) / 2.0;
float levels = 10.0;
float band_value_for_color = floor(noise_val * levels) / levels;
float pos_in_band_segment = fract(noise_val * levels); // Value from 0.0 to 1.0 within the segment
float line_width_target = 0.5; // The "solid" part of the line
// ---- SIMPLER ANTI-ALIASING ----
// Define a "feather" or "softness" amount. This is how much extra space on EACH side of the
// line_width_target will be used for the smooth transition.
// This value is also in the [0,1] space of pos_in_band_segment.
// A smaller value = sharper edge. A larger value = softer, wider perceived line.
float feather = 0.1; // Try values like 0.01, 0.02, 0.03, 0.05
// Calculate the edges for smoothstep
// Edge0: where the line starts to fade IN (inner edge of feathering)
// Edge1: where the line is fully opaque (outer edge of feathering for fade-in, start of solid part)
// Edge2: where the line starts to fade OUT (end of solid part, inner edge of feathering for fade-out)
// Edge3: where the line is fully transparent (outer edge of feathering for fade-out)
// The line effectively "exists" from 0 to line_width_target.
// We want to smooth the transition around 0 and around line_width_target.
float edge0 = 0.0 - feather; // Start fading in before 0
float edge1 = 0.0 + feather; // Fully faded in after 0
float edge2 = line_width_target - feather; // Start fading out before line_width_target
float edge3 = line_width_target + feather; // Fully faded out after line_width_target
// Alpha contribution from the "fade-in" part (from edge0 to edge1)
float alpha_in = smoothstep(edge0, edge1, pos_in_band_segment);
// Alpha contribution from the "fade-out" part (from edge2 to edge3)
// This needs to be 1.0 when pos_in_band_segment < edge2, and ramp down to 0.0 at edge3.
float alpha_out = 1.0 - smoothstep(edge2, edge3, pos_in_band_segment);
// The final alpha is the minimum of these two, ensuring it forms a band.
// This creates a plateau of 1.0 between edge1 and edge2.
float line_alpha = min(alpha_in, alpha_out);
line_alpha = clamp(line_alpha, 0.0, 1.0); // Just in case
// Alternative: A simpler single smoothstep if line_width_target is the center
// and feather is half the total width of the smoothed line. This is for a line
// *centered* at line_width_target / 2.
// Our current line starts at 0.
// float line_center = line_width_target / 2.0;
// float half_line_plus_feather = line_width_target / 2.0 + feather;
// line_alpha = 1.0 - smoothstep(line_center - half_line_plus_feather,
// line_center + half_line_plus_feather,
// abs(pos_in_band_segment - line_center));
// This alternative approach creates a line centered around line_center with a total
// smoothed width of 2.0 * half_line_plus_feather.
// For our current setup where the line starts at 0 and goes to line_width_target,
// the min(alpha_in, alpha_out) is more direct.
vec3 final_color_rgb = vec3(0.0);
if (line_alpha > 0.001) {
final_color_rgb = colormap_clean(band_value_for_color);
}
out_FragColor = vec4(final_color_rgb, line_alpha);
}
`;
// --- Shader Program Setup ---
function createShader(glInstance, type, source) {
const shader = glInstance.createShader(type);
glInstance.shaderSource(shader, source);
glInstance.compileShader(shader);
if (
!glInstance.getShaderParameter(
shader,
glInstance.COMPILE_STATUS,
)
) {
const shaderType =
type === glInstance.VERTEX_SHADER ? "Vertex" : "Fragment";
console.error(
`TopoShader: Error compiling ${shaderType} shader:\n${glInstance.getShaderInfoLog(shader)}`,
);
const sourceLines = source.split("\n");
let formattedSource = "";
for (let i = 0; i < sourceLines.length; i++) {
formattedSource += `${i + 1}: ${sourceLines[i]}\n`;
}
console.error("Shader Source:\n" + formattedSource);
glInstance.deleteShader(shader);
return null;
}
return shader;
}
const vertexShader = createShader(gl, gl.VERTEX_SHADER, vsSource);
const fragmentShader = createShader(gl, gl.FRAGMENT_SHADER, fsSource);
if (!vertexShader || !fragmentShader) {
console.error("TopoShader: Shader creation failed. Aborting.");
return;
}
const program = gl.createProgram();
gl.attachShader(program, vertexShader);
gl.attachShader(program, fragmentShader);
gl.linkProgram(program);
if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
console.error(
"TopoShader: Error linking program: " +
gl.getProgramInfoLog(program),
);
return;
}
// --- Data, Attributes, Uniforms ---
const positionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
const positions = [-1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1];
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array(positions),
gl.STATIC_DRAW,
);
// Note: In WebGL2, you might query attribute locations before linking,
// or use layout qualifiers in GLSL. getAttribLocation after linking is fine.
const positionAttributeLocation = gl.getAttribLocation(
program,
"a_position",
);
const resolutionUniformLocation = gl.getUniformLocation(
program,
"u_resolution",
);
const timeUniformLocation = gl.getUniformLocation(program, "u_time");
// --- Render Loop ---
let animationFrameId = null;
function render(time) {
time *= 0.001;
const displayWidth = canvas.clientWidth;
const displayHeight = canvas.clientHeight;
if (
canvas.width !== displayWidth ||
canvas.height !== displayHeight
) {
canvas.width = displayWidth;
canvas.height = displayHeight;
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
}
gl.clearColor(0.0, 0.0, 0.0, 0.0);
gl.clear(gl.COLOR_BUFFER_BIT);
gl.enable(gl.BLEND);
gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
gl.useProgram(program);
gl.enableVertexAttribArray(positionAttributeLocation);
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
// For WebGL2, ensure vertexAttribPointer types match 'in' variable type in shader
gl.vertexAttribPointer(
positionAttributeLocation,
2,
gl.FLOAT,
false,
0,
0,
);
gl.uniform2f(
resolutionUniformLocation,
gl.canvas.width,
gl.canvas.height,
);
gl.uniform1f(timeUniformLocation, time);
gl.drawArrays(gl.TRIANGLES, 0, 6);
animationFrameId = requestAnimationFrame(render);
}
animationFrameId = requestAnimationFrame(render);
}
if (document.readyState === "loading") {
document.addEventListener("DOMContentLoaded", initTopoShader);
} else {
initTopoShader();
}
</script>
</body>
</html>
|
