mirror_js/WebGL-Fluid-Simulation
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multitouch fix and add fbo resizing

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This commit is contained in:
Pavel Dobryakov
2017-08-26 17:20:35 +03:00
parent 63b5d9df7d
commit 2ebcbd0f78
1 changed files with 52 additions and 38 deletions
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82
script.js
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@@ -1,8 +1,10 @@
'use strict';
const canvas = document.getElementsByTagName('canvas')[0];
const params = { alpha: false, depth: false, stencil: false, antialias: false };
canvas.width = canvas.clientWidth;
canvas.height = canvas.clientHeight;
const params = { alpha: false, depth: false, stencil: false, antialias: false };
let gl = canvas.getContext('webgl2', params);
const isWebGL2 = !!gl;
if (!isWebGL2) {
@@ -17,13 +19,7 @@ if (isWebGL2) {
support_linear_float = gl.getExtension('OES_texture_float_linear');
}
gl.clearColor(0.0, 0.0, 0.0, 1.0);
resizeCanvas();
const TEXTURE_DOWNSAMPLE = 1;
const TEXTURE_WIDTH = gl.drawingBufferWidth >> TEXTURE_DOWNSAMPLE;
const TEXTURE_HEIGHT = gl.drawingBufferHeight >> TEXTURE_DOWNSAMPLE;
const DENSITY_DISSIPATION = 0.98;
const VELOCITY_DISSIPATION = 0.99;
const SPLAT_RADIUS = 0.005;
@@ -39,9 +35,8 @@ class GLProgram {
gl.attachShader(this.program, fragmentShader);
gl.linkProgram(this.program);
if (!gl.getProgramParameter(this.program, gl.LINK_STATUS)) {
if (!gl.getProgramParameter(this.program, gl.LINK_STATUS))
throw gl.getProgramInfoLog(this.program);
}
const uniformCount = gl.getProgramParameter(this.program, gl.ACTIVE_UNIFORMS);
for (let i = 0; i < uniformCount; i++) {
@@ -60,9 +55,8 @@ function compileShader (type, source) {
gl.shaderSource(shader, source);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS))
throw gl.getShaderInfoLog(shader);
}
return shader;
};
@@ -365,16 +359,31 @@ function createDoubleFBO (texId, w, h, internalFormat, format, type, param) {
}
}
let textureWidth;
let textureHeight;
let density;
let velocity;
let divergence;
let curl;
let pressure;
function initFramebuffers () {
textureWidth = gl.drawingBufferWidth >> TEXTURE_DOWNSAMPLE;
textureHeight = gl.drawingBufferHeight >> TEXTURE_DOWNSAMPLE;
const internalFormat = isWebGL2 ? gl.RGBA16F : gl.RGBA;
const internalFormatRG = isWebGL2 ? gl.RG16F : gl.RGBA;
const formatRG = isWebGL2 ? gl.RG : gl.RGBA;
const texType = isWebGL2 ? gl.HALF_FLOAT : halfFloat.HALF_FLOAT_OES;
let density = createDoubleFBO(0, TEXTURE_WIDTH, TEXTURE_HEIGHT, internalFormat , gl.RGBA , texType, support_linear_float ? gl.LINEAR : gl.NEAREST);
let velocity = createDoubleFBO(2, TEXTURE_WIDTH, TEXTURE_HEIGHT, internalFormatRG, formatRG, texType, support_linear_float ? gl.LINEAR : gl.NEAREST);
let divergence = createFBO (4, TEXTURE_WIDTH, TEXTURE_HEIGHT, internalFormatRG, formatRG, texType, gl.NEAREST);
let curl = createFBO (5, TEXTURE_WIDTH, TEXTURE_HEIGHT, internalFormatRG, formatRG, texType, gl.NEAREST);
let pressure = createDoubleFBO(6, TEXTURE_WIDTH, TEXTURE_HEIGHT, internalFormatRG, formatRG, texType, gl.NEAREST);
density = createDoubleFBO(0, textureWidth, textureHeight, internalFormat , gl.RGBA , texType, support_linear_float ? gl.LINEAR : gl.NEAREST);
velocity = createDoubleFBO(2, textureWidth, textureHeight, internalFormatRG, formatRG, texType, support_linear_float ? gl.LINEAR : gl.NEAREST);
divergence = createFBO (4, textureWidth, textureHeight, internalFormatRG, formatRG, texType, gl.NEAREST);
curl = createFBO (5, textureWidth, textureHeight, internalFormatRG, formatRG, texType, gl.NEAREST);
pressure = createDoubleFBO(6, textureWidth, textureHeight, internalFormatRG, formatRG, texType, gl.NEAREST);
}
initFramebuffers();
const displayProgram = new GLProgram(baseVertexShader, displayShader);
const splatProgram = new GLProgram(baseVertexShader, splatShader);
@@ -386,6 +395,7 @@ const pressureProgram = new GLProgram(baseVertexShader, pressureShader);
const gradienSubtractProgram = new GLProgram(baseVertexShader, gradientSubtractShader);
function pointerPrototype () {
this.id = -1;
this.x = 0;
this.y = 0;
this.dx = 0;
@@ -416,10 +426,10 @@ function Update () {
const dt = Math.min((Date.now() - lastTime) / 1000, 0.016);
lastTime = Date.now();
gl.viewport(0, 0, TEXTURE_WIDTH, TEXTURE_HEIGHT);
gl.viewport(0, 0, textureWidth, textureHeight);
advectionProgram.bind();
gl.uniform2f(advectionProgram.uniforms.texelSize, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform2f(advectionProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.first[2]);
gl.uniform1i(advectionProgram.uniforms.uSource, velocity.first[2]);
gl.uniform1f(advectionProgram.uniforms.dt, dt);
@@ -442,12 +452,12 @@ function Update () {
}
curlProgram.bind();
gl.uniform2f(curlProgram.uniforms.texelSize, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform2f(curlProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
gl.uniform1i(curlProgram.uniforms.uVelocity, velocity.first[2]);
blit(curl[1]);
vorticityProgram.bind();
gl.uniform2f(vorticityProgram.uniforms.texelSize, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform2f(vorticityProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
gl.uniform1i(vorticityProgram.uniforms.uVelocity, velocity.first[2]);
gl.uniform1i(vorticityProgram.uniforms.uCurl, curl[2]);
gl.uniform1f(vorticityProgram.uniforms.curl, CURL);
@@ -456,13 +466,13 @@ function Update () {
velocity.swap();
divergenceProgram.bind();
gl.uniform2f(divergenceProgram.uniforms.texelSize, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform2f(divergenceProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
gl.uniform1i(divergenceProgram.uniforms.uVelocity, velocity.first[2]);
blit(divergence[1]);
clear(pressure.first[1]);
pressureProgram.bind();
gl.uniform2f(pressureProgram.uniforms.texelSize, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform2f(pressureProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
gl.uniform1i(pressureProgram.uniforms.uDivergence, divergence[2]);
for (let i = 0; i < PRESSURE_ITERATIONS; i++) {
gl.uniform1i(pressureProgram.uniforms.uPressure, pressure.first[2]);
@@ -471,7 +481,7 @@ function Update () {
}
gradienSubtractProgram.bind();
gl.uniform2f(gradienSubtractProgram.uniforms.texelSize, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform2f(gradienSubtractProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
gl.uniform1i(gradienSubtractProgram.uniforms.uPressure, pressure.first[2]);
gl.uniform1i(gradienSubtractProgram.uniforms.uVelocity, velocity.first[2]);
blit(velocity.second[1]);
@@ -503,9 +513,9 @@ function splat (x, y, dx, dy, color) {
function resizeCanvas () {
if (canvas.width != canvas.clientWidth || canvas.height != canvas.clientHeight) {
const displayHeight = canvas.clientHeight;
canvas.width = canvas.clientWidth;
canvas.height = displayHeight;
canvas.height = canvas.clientHeight;
initFramebuffers();
}
}
@@ -538,9 +548,10 @@ canvas.addEventListener('mousedown', () => {
canvas.addEventListener('touchstart', (e) => {
const touches = e.targetTouches;
for (let i = 0; i < touches.length; i++) {
if (i >= pointers.length) {
if (i >= pointers.length)
pointers.push(new pointerPrototype());
}
pointers[i].id = touches[i].identifier;
pointers[i].down = true;
pointers[i].x = touches[i].pageX;
pointers[i].y = touches[i].pageY;
@@ -548,11 +559,14 @@ canvas.addEventListener('touchstart', (e) => {
}
});
window.addEventListener('mouseup', onPointerUp);
window.addEventListener('touchend', onPointerUp);
window.addEventListener('mouseup', () => {
pointers[0].down = false;
});
function onPointerUp () {
for (let i = 0; i < pointers.length; i++) {
pointers[i].down = false;
}
}
window.addEventListener('touchend', (e) => {
const touches = e.changedTouches;
for (let i = 0; i < touches.length; i++)
for (let j = 0; j < pointers.length; j++)
if (touches[i].identifier == pointers[j].id)
pointers[j].down = false;
});