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render fake perlin noise waves

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Julian
2020-01-22 02:20:25 +01:00
parent 0ae0bb80eb
commit 5a24ae7216
2 changed files with 103 additions and 61 deletions
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144
index.html
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@@ -1,66 +1,104 @@
<!DOCTYPE html>
<html>
<header>
<title>Web Ocean</title>
<script id="shader-fs" type="x-shader/x-fragment">
<header>
<title>Web Ocean</title>
<script id="shader-fs" type="x-shader/x-fragment">
precision mediump float;
// Noise
// Source: https://medium.com/neosavvy-labs/webgl-with-perlin-noise-part-1-a87b56bbc9fb
// Description: https://flafla2.github.io/2014/08/09/perlinnoise.html
// https://mzucker.github.io/html/perlin-noise-math-faq.
// https://thebookofshaders.com/11/
//ordered by importance
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)+1.0)*x); }
vec4 taylorInvSqrt(vec4 r) { return 1.79284291400159 - 0.85373472095314 * r; }
vec3 fade(vec3 t) { return t*t*t*(t*(t*6.0-15.0)+10.0); }
float noise(vec3 P) {
vec3 i0 = mod289(floor(P)), i1 = mod289(i0 + vec3(1.0));
vec3 f0 = fract(P), f1 = f0 - vec3(1.0), f = fade(f0);
vec4 ix = vec4(i0.x, i1.x, i0.x, i1.x), iy = vec4(i0.yy, i1.yy);
vec4 iz0 = i0.zzzz, iz1 = i1.zzzz;
vec4 ixy = permute(permute(ix) + iy), ixy0 = permute(ixy + iz0), ixy1 = permute(ixy + iz1);
vec4 gx0 = ixy0 * (1.0 / 7.0), gy0 = fract(floor(gx0) * (1.0 / 7.0)) - 0.5;
vec4 gx1 = ixy1 * (1.0 / 7.0), gy1 = fract(floor(gx1) * (1.0 / 7.0)) - 0.5;
gx0 = fract(gx0); gx1 = fract(gx1);
vec4 gz0 = vec4(0.5) - abs(gx0) - abs(gy0), sz0 = step(gz0, vec4(0.0));
vec4 gz1 = vec4(0.5) - abs(gx1) - abs(gy1), sz1 = step(gz1, vec4(0.0));
gx0 -= sz0 * (step(0.0, gx0) - 0.5); gy0 -= sz0 * (step(0.0, gy0) - 0.5);
gx1 -= sz1 * (step(0.0, gx1) - 0.5); gy1 -= sz1 * (step(0.0, gy1) - 0.5);
vec3 g0 = vec3(gx0.x,gy0.x,gz0.x), g1 = vec3(gx0.y,gy0.y,gz0.y),
g2 = vec3(gx0.z,gy0.z,gz0.z), g3 = vec3(gx0.w,gy0.w,gz0.w),
g4 = vec3(gx1.x,gy1.x,gz1.x), g5 = vec3(gx1.y,gy1.y,gz1.y),
g6 = vec3(gx1.z,gy1.z,gz1.z), g7 = vec3(gx1.w,gy1.w,gz1.w);
vec4 norm0 = taylorInvSqrt(vec4(dot(g0,g0), dot(g2,g2), dot(g1,g1), dot(g3,g3)));
vec4 norm1 = taylorInvSqrt(vec4(dot(g4,g4), dot(g6,g6), dot(g5,g5), dot(g7,g7)));
g0 *= norm0.x; g2 *= norm0.y; g1 *= norm0.z; g3 *= norm0.w;
g4 *= norm1.x; g6 *= norm1.y; g5 *= norm1.z; g7 *= norm1.w;
vec4 nz = mix(vec4(dot(g0, vec3(f0.x, f0.y, f0.z)), dot(g1, vec3(f1.x, f0.y, f0.z)),
dot(g2, vec3(f0.x, f1.y, f0.z)), dot(g3, vec3(f1.x, f1.y, f0.z))),
vec4(dot(g4, vec3(f0.x, f0.y, f1.z)), dot(g5, vec3(f1.x, f0.y, f1.z)),
dot(g6, vec3(f0.x, f1.y, f1.z)), dot(g7, vec3(f1.x, f1.y, f1.z))), f.z);
return 2.2 * mix(mix(nz.x,nz.z,f.y), mix(nz.y,nz.w,f.y), f.x);
}
uniform float uTime;
// Noise
// Source: https://medium.com/neosavvy-labs/webgl-with-perlin-noise-part-1-a87b56bbc9fb function
// Description: https://flafla2.github.io/2014/08/09/perlinnoise.html with octaves
// https://mzucker.github.io/html/perlin-noise-math-faq mathematics
// http://www.huttar.net/lars-kathy/graphics/perlin-noise/perlin-noise.html deeper look
// https://thebookofshaders.com/11/
//ordered by importance
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)+1.0)*x); }
vec4 taylorInvSqrt(vec4 r) { return 1.79284291400159 - 0.85373472095314 * r; }
vec3 fade(vec3 t) { return t*t*t*(t*(t*6.0-15.0)+10.0); }
float noise(vec3 P) {
vec3 i0 = mod289(floor(P)), i1 = mod289(i0 + vec3(1.0));
vec3 f0 = fract(P), f1 = f0 - vec3(1.0), f = fade(f0);
vec4 ix = vec4(i0.x, i1.x, i0.x, i1.x), iy = vec4(i0.yy, i1.yy);
vec4 iz0 = i0.zzzz, iz1 = i1.zzzz;
vec4 ixy = permute(permute(ix) + iy), ixy0 = permute(ixy + iz0), ixy1 = permute(ixy + iz1);
vec4 gx0 = ixy0 * (1.0 / 7.0), gy0 = fract(floor(gx0) * (1.0 / 7.0)) - 0.5;
vec4 gx1 = ixy1 * (1.0 / 7.0), gy1 = fract(floor(gx1) * (1.0 / 7.0)) - 0.5;
gx0 = fract(gx0); gx1 = fract(gx1);
vec4 gz0 = vec4(0.5) - abs(gx0) - abs(gy0), sz0 = step(gz0, vec4(0.0));
vec4 gz1 = vec4(0.5) - abs(gx1) - abs(gy1), sz1 = step(gz1, vec4(0.0));
gx0 -= sz0 * (step(0.0, gx0) - 0.5); gy0 -= sz0 * (step(0.0, gy0) - 0.5);
gx1 -= sz1 * (step(0.0, gx1) - 0.5); gy1 -= sz1 * (step(0.0, gy1) - 0.5);
vec3 g0 = vec3(gx0.x,gy0.x,gz0.x), g1 = vec3(gx0.y,gy0.y,gz0.y),
g2 = vec3(gx0.z,gy0.z,gz0.z), g3 = vec3(gx0.w,gy0.w,gz0.w),
g4 = vec3(gx1.x,gy1.x,gz1.x), g5 = vec3(gx1.y,gy1.y,gz1.y),
g6 = vec3(gx1.z,gy1.z,gz1.z), g7 = vec3(gx1.w,gy1.w,gz1.w);
vec4 norm0 = taylorInvSqrt(vec4(dot(g0,g0), dot(g2,g2), dot(g1,g1), dot(g3,g3)));
vec4 norm1 = taylorInvSqrt(vec4(dot(g4,g4), dot(g6,g6), dot(g5,g5), dot(g7,g7)));
g0 *= norm0.x; g2 *= norm0.y; g1 *= norm0.z; g3 *= norm0.w;
g4 *= norm1.x; g6 *= norm1.y; g5 *= norm1.z; g7 *= norm1.w;
vec4 nz = mix(vec4(dot(g0, vec3(f0.x, f0.y, f0.z)), dot(g1, vec3(f1.x, f0.y, f0.z)),
dot(g2, vec3(f0.x, f1.y, f0.z)), dot(g3, vec3(f1.x, f1.y, f0.z))),
vec4(dot(g4, vec3(f0.x, f0.y, f1.z)), dot(g5, vec3(f1.x, f0.y, f1.z)),
dot(g6, vec3(f0.x, f1.y, f1.z)), dot(g7, vec3(f1.x, f1.y, f1.z))), f.z);
return 2.2 * mix(mix(nz.x,nz.z,f.y), mix(nz.y,nz.w,f.y), f.x);
}
float octavedPerlinNoise(vec3 P,int octaves,float persistence) {
float total = 0.0;
float frequency = 128.0;
float amplitude = 4.0;
float maxValue = 0.0;
for(int i = 0; i < 8; i++) {
total += noise((P*frequency)) * amplitude;
maxValue += amplitude;
amplitude *= persistence;
frequency /= 2.;
}
return total/maxValue;
}
float turbulence(vec3 P) {
float f = 0., s = 1.;
for (int i = 0 ; i < 9 ; i++) {
f += abs(noise(s * P)) / s;
s *= 2.;
P = vec3(.866 * P.x + .5 * P.z, P.y + 100., -.5 * P.x + .866 * P.z);
}
return f;
}
vec3 clouds(float x, float y) {
float L = turbulence(vec3(x, y, 1. * .1));
return vec3(noise(vec3(.5, .5, L) * .7));
}
void main(void) {
float n = noise(vec3(gl_FragCoord.xy*0.2,0.0));
gl_FragColor = vec4(n,n,n,1.0);
float n = octavedPerlinNoise(vec3(gl_FragCoord.x*0.001,gl_FragCoord.y*0.007+uTime*0.1,uTime*0.05),8,2.0); //Should be scaled along arbitary axis
//float n = noise(vec3(gl_FragCoord.xy*0.01,uTime));
//vec3 cloudEffect = clouds(gl_FragCoord.x*0.005, gl_FragCoord.y*0.005);
vec3 color = n + (vec3(1., 1., 1.)/2.);
gl_FragColor = vec4(color,1.0);
}
</script>
<script id="shader-vs" type="x-shader/x-vertex">
</script>
<script id="shader-vs" type="x-shader/x-vertex">
attribute vec3 positionAttr;
void main(void) {
gl_Position = vec4(positionAttr, 1.0);
}
</script>
</header>
<body>
<canvas id="window" width="800" height="600" style="margin:0 auto; border: solid #000000 1px; display:block;"></canvas>
<script src="build/app.js"></script>
</body>
</script>
</header>
<body>
<canvas id="window" width="800" height="600"
style="margin:0 auto; border: solid #000000 1px; display:block;"></canvas>
<script src="build/app.js"></script>
</body>
</html>

20
src/main.ts
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@@ -2,8 +2,6 @@ var gl: WebGLRenderingContext;
var viewportWidth = 0;
var viewportHeight = 0;
main();
function initGL(canvas: HTMLCanvasElement) {
var gltemp;
try {
@@ -27,9 +25,9 @@ function initGL(canvas: HTMLCanvasElement) {
function initGeometry() {
let VBO = gl.createBuffer();
let vertexData = [-0.5, -0.5, 0.0,
0.5, -0.5, 0.0,
0.0, 0.5, 0.0];
let vertexData = [-1.0, -1.0, 0.0,
1.0, -1.0, 0.0,
0.0, 1.0, 0.0];
gl.bindBuffer(gl.ARRAY_BUFFER, VBO);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertexData), gl.STATIC_DRAW);
@@ -99,20 +97,24 @@ function initShaders() {
return program;
}
var timeSpent = 0.0;
function drawScene(buffer: WebGLBuffer, program: WebGLProgram) {
timeSpent += 1.0 / 60.0;
gl.viewport(0, 0, viewportWidth, viewportHeight);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
// There are 7 floating-point values per vertex
var stride = 3 * Float32Array.BYTES_PER_ELEMENT;
let stride = 3 * Float32Array.BYTES_PER_ELEMENT;
// Set up position stream
gl.vertexAttribPointer(0, 3, gl.FLOAT, false, stride, 0);
gl.enableVertexAttribArray(0);
gl.useProgram(program);
let uTime = gl.getUniformLocation(program, "uTime");
gl.uniform1f(uTime, timeSpent);
gl.drawArrays(gl.TRIANGLES, 0, 3);
}
@@ -130,10 +132,12 @@ function main() {
gl.clear(gl.COLOR_BUFFER_BIT);
if (triangleVBO != null && shaderProgram != null) {
drawScene(triangleVBO, shaderProgram);
window.setInterval(drawScene, 1000 / 60, triangleVBO, shaderProgram);
}
if(gl.getError() != gl.NO_ERROR) {
if (gl.getError() != gl.NO_ERROR) {
console.log("OpenGL Error!: ");
}
}
main();