mirror_js/WebGL-Fluid-Simulation
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fix

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This commit is contained in:
Pavel Dobryakov
2017-08-08 18:05:16 +03:00
parent c800152c56
commit 482e1b9033
1 changed files with 23 additions and 23 deletions
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46
script.js
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@@ -188,7 +188,7 @@ const advectionShader = compileShader(gl.FRAGMENT_SHADER, `
varying vec2 vUv;
uniform sampler2D uVelocity;
uniform sampler2D uSource;
uniform vec2 wh_inv;
uniform vec2 texelSize;
uniform float rdx;
uniform float dt;
uniform float dissipation;
@@ -197,7 +197,7 @@ const advectionShader = compileShader(gl.FRAGMENT_SHADER, `
vec4 bilerp (sampler2D sam, vec2 p)
{
vec2 res = 1.0 / wh_inv.xy;
vec2 res = 1.0 / texelSize.xy;
// vec2 st = p * res - 0.5;
// vec2 iuv = floor(st);
// vec2 fuv = fract(st);
@@ -231,14 +231,14 @@ const divergenceShader = compileShader(gl.FRAGMENT_SHADER, `
varying vec2 vUv;
uniform sampler2D uVelocity;
uniform vec2 wh_inv;
uniform vec2 texelSize;
uniform float halfrdx;
void main () {
vec2 T = texture2D(uVelocity, vUv + vec2(0.0, wh_inv.y)).xy;
vec2 B = texture2D(uVelocity, vUv - vec2(0.0, wh_inv.y)).xy;
vec2 R = texture2D(uVelocity, vUv + vec2(wh_inv.x, 0.0)).xy;
vec2 L = texture2D(uVelocity, vUv - vec2(wh_inv.x, 0.0)).xy;
vec2 T = texture2D(uVelocity, vUv + vec2(0.0, texelSize.y)).xy;
vec2 B = texture2D(uVelocity, vUv - vec2(0.0, texelSize.y)).xy;
vec2 R = texture2D(uVelocity, vUv + vec2(texelSize.x, 0.0)).xy;
vec2 L = texture2D(uVelocity, vUv - vec2(texelSize.x, 0.0)).xy;
//vec2 C = texture2D(uVelocity, vUv).xy;
float div = halfrdx * (R.x - L.x + T.y - B.y);
gl_FragColor = vec4(div, 0.0, 0.0, 1.0);
@@ -251,14 +251,14 @@ const pressureShader = compileShader(gl.FRAGMENT_SHADER, `
varying vec2 vUv;
uniform sampler2D uPressure;
uniform sampler2D uDivergence;
uniform vec2 wh_inv;
uniform vec2 texelSize;
uniform float alpha;
void main () {
float T = texture2D(uPressure, vUv + vec2(0.0, wh_inv.y)).x;
float B = texture2D(uPressure, vUv - vec2(0.0, wh_inv.y)).x;
float R = texture2D(uPressure, vUv + vec2(wh_inv.x, 0.0)).x;
float L = texture2D(uPressure, vUv - vec2(wh_inv.x, 0.0)).x;
float T = texture2D(uPressure, vUv + vec2(0.0, texelSize.y)).x;
float B = texture2D(uPressure, vUv - vec2(0.0, texelSize.y)).x;
float R = texture2D(uPressure, vUv + vec2(texelSize.x, 0.0)).x;
float L = texture2D(uPressure, vUv - vec2(texelSize.x, 0.0)).x;
float divergence = texture2D(uDivergence, vUv).x;
float pressure = (L + R + B + T + alpha * divergence) * .25;
@@ -272,14 +272,14 @@ const gradientSubtractShader = compileShader(gl.FRAGMENT_SHADER, `
varying vec2 vUv;
uniform sampler2D uPressure;
uniform sampler2D uVelocity;
uniform vec2 wh_inv;
uniform vec2 texelSize;
uniform float halfrdx;
void main () {
float T = texture2D(uPressure, vUv + vec2(0.0, wh_inv.y)).x;
float B = texture2D(uPressure, vUv - vec2(0.0, wh_inv.y)).x;
float R = texture2D(uPressure, vUv + vec2(wh_inv.x, 0.0)).x;
float L = texture2D(uPressure, vUv - vec2(wh_inv.x, 0.0)).x;
float T = texture2D(uPressure, vUv + vec2(0.0, texelSize.y)).x;
float B = texture2D(uPressure, vUv - vec2(0.0, texelSize.y)).x;
float R = texture2D(uPressure, vUv + vec2(texelSize.x, 0.0)).x;
float L = texture2D(uPressure, vUv - vec2(texelSize.x, 0.0)).x;
vec2 velocity = texture2D(uVelocity, vUv).xy;
velocity.xy -= halfrdx * vec2(R - L, T - B);
@@ -319,7 +319,7 @@ function Update () {
advectionProgram.bind();
gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.first[2]);
gl.uniform1i(advectionProgram.uniforms.uSource, velocity.first[2]);
gl.uniform2f(advectionProgram.uniforms.wh_inv, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform2f(advectionProgram.uniforms.texelSize, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform1f(advectionProgram.uniforms.rdx, 1.0 / CELL_SIZE);
gl.uniform1f(advectionProgram.uniforms.dt, 0.16);
gl.uniform1f(advectionProgram.uniforms.dissipation, 1.0);
@@ -336,8 +336,8 @@ function Update () {
// calculate divergence
divergenceProgram.bind();
gl.uniform1i(divergenceProgram.uniforms.uVelocity, velocity.first[2]);
gl.uniform2f(divergenceProgram.uniforms.wh_inv, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform1f(divergenceProgram.uniforms.halfrdx, 0.5 * CELL_SIZE);
gl.uniform2f(divergenceProgram.uniforms.texelSize, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform1f(divergenceProgram.uniforms.halfrdx, 0.5 / CELL_SIZE);
blit(divergence[1]);
// pressure
@@ -345,7 +345,7 @@ function Update () {
// clear(pressure.second[1]);
pressureProgram.bind();
gl.uniform1i(pressureProgram.uniforms.uDivergence, divergence[2]);
gl.uniform2f(pressureProgram.uniforms.wh_inv, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform2f(pressureProgram.uniforms.texelSize, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform1f(pressureProgram.uniforms.alpha, -CELL_SIZE * CELL_SIZE);
for (let i = 0; i < 10; i++) {
gl.uniform1i(pressureProgram.uniforms.uPressure, pressure.first[2]);
@@ -357,8 +357,8 @@ function Update () {
gradienSubtractProgram.bind();
gl.uniform1i(gradienSubtractProgram.uniforms.uPressure, pressure.first[2]);
gl.uniform1i(gradienSubtractProgram.uniforms.uVelocity, velocity.first[2]);
gl.uniform2f(gradienSubtractProgram.uniforms.wh_inv, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform1f(gradienSubtractProgram.uniforms.halfrdx, 0.5 * CELL_SIZE);
gl.uniform2f(gradienSubtractProgram.uniforms.texelSize, 1.0 / TEXTURE_WIDTH, 1.0 / TEXTURE_HEIGHT);
gl.uniform1f(gradienSubtractProgram.uniforms.halfrdx, 0.5 / CELL_SIZE);
blit(velocity.second[1]);
velocity.swap();