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Commit 89dfe426 authored by Yein Jo's avatar Yein Jo
Browse files

Actually use the int based hash in 2d simplex. 

Follow up of ag/25804141, forgot to actually use in 2d.
3d version correctly uses it!

Bug: 315533269
Test: build, visual inspection
Flag: NA
Change-Id: I2321e587841b7d32c0b7afdd76eed5539eb4d3d3
parent 51c5b4f2

weathereffects/assets/shaders/simplex2d.agsl

+7 −7
Original line number Diff line number Diff line
@@ -35,7 +35,7 @@ int imod(int a, int b) { 
}



// 2D hash without bit-wise operations

vec2 hash(vec2 p) {

vec2 ihash2d(vec2 p) {

    int a = int(p.x + p.y) * 15823;

    int b = a * 65536; // a << 16
@@ -89,9 +89,9 @@ float simplex2d_flow(vec2 p, float rot, float time) { 
    vec2 v2 = v0 - 1.0 + 2.*UNSKEW;



    // Get random gradient vector.

    vec2 g0 = hash2d(i);

    vec2 g1 = hash2d(i+walk);

    vec2 g2 = hash2d(i+1.0);

    vec2 g0 = ihash2d(i);

    vec2 g1 = ihash2d(i+walk);

    vec2 g2 = ihash2d(i+1.0);



    // Make the gradient vectors dynamic by adding rotations.

    g0 += getVectorFromAngle(rot * time * hash1d(i));
@@ -118,9 +118,9 @@ float simplex2d(vec2 p) { 
    vec2 v2 = v0 - 1.0 + 2.*UNSKEW;



    // Get random gradient vector.

    vec2 g0 = hash2d(i);

    vec2 g1 = hash2d(i+walk);

    vec2 g2 = hash2d(i+1.0);

    vec2 g0 = ihash2d(i);

    vec2 g1 = ihash2d(i+walk);

    vec2 g2 = ihash2d(i+1.0);



    return kernel_summation(v0, v1, v2, g0, g1, g2);

}