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Hide visible scrolling in static noise

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Randomize vertical position of staticNoise texel and add to
existing scrolling of noise texture (both horizontal and vertical;
faster in vertical direction)
This commit is contained in:
Aaron Kollasch 2022-11-02 02:22:35 -04:00
parent f157648d1e
commit a683c5ad85
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GPG Key ID: F813CAE853E39883
1 changed files with 16 additions and 1 deletions
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17
app/qml/ShaderTerminal.qml
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@ -243,6 +243,17 @@ Item {
" return outColor;
}" +
//pseudo-random vector
//https://stackoverflow.com/a/10625698
"float random( vec2 p )
{
vec2 K1 = vec2(
23.14069263277926, // e^pi (Gelfond's constant)
2.665144142690225 // 2^sqrt(2) (Gelfond-Schneider constant)
);
return fract( cos( dot(p,K1) ) * 12345.6789 );
}" +
"void main() {" +
"vec2 cc = vec2(0.5) - qt_TexCoord0;" +
"float distance = length(cc);" +
@ -281,7 +292,11 @@ Item {
: "") +
(jitter !== 0 || staticNoise !== 0 ?
"vec4 noiseTexel = texture2D(noiseSource, scaleNoiseSize * coords + vec2(fract(time / 51.0), fract(time / 237.0)));"
"vec4 noiseTexel = texture2D(
noiseSource, scaleNoiseSize * coords
+ vec2(0.0, random(vec2(fract(time / 237.0), 822.9582)))
+ vec2(fract(time / 31.0), fract(time / 177.0))
);"
: "") +
(jitter !== 0 ? "