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Simplifying rainPass.compute's weirder operations.

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Rezmason
2021-10-23 01:12:31 -07:00
parent 2265e3c937
commit cf5f8c2113
3 changed files with 16 additions and 15 deletions
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16
shaders/rainPass.compute
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@@ -40,20 +40,24 @@ vec2 randomVec2( const in vec2 uv ) {
return fract(vec2(sin(uv.x * 591.32 + uv.y * 154.077), cos(uv.x * 391.32 + uv.y * 49.077)));
}
float wobble(float x) {
return x + 0.3 * sin(SQRT_2 * x) + 0.2 * sin(SQRT_5 * x);
}
// Core functions
// Rain time is the shader's key underlying concept.
// It's why glyphs that share a column are lit simultaneously, and are brighter toward the bottom.
float getRainTime(float simTime, vec2 glyphPos) {
float columnTimeOffset = randomFloat(vec2(glyphPos.x, 0.));
float columnSpeedOffset = randomFloat(vec2(glyphPos.x + 0.1, 0.));
float columnTimeOffset = randomFloat(vec2(glyphPos.x, 0.)) * 1000.;
float columnSpeedOffset = randomFloat(vec2(glyphPos.x + 0.1, 0.)) * 0.5 + 0.5;
// columnSpeedOffset = 0.; // TODO: loop
float columnTime = (columnTimeOffset * 1000. + simTime * 0.5 * fallSpeed) * (0.5 + columnSpeedOffset * 0.5) + (sin(simTime * fallSpeed * columnSpeedOffset) * 0.2);
float columnTime = columnTimeOffset + simTime * fallSpeed * columnSpeedOffset;
return (glyphPos.y * 0.01 + columnTime) / raindropLength;
}
float getBrightness(float rainTime) {
float value = 1. - fract((rainTime + 0.3 * sin(SQRT_2 * rainTime) + 0.2 * sin(SQRT_5 * rainTime)));
float value = 1. - fract(wobble(rainTime));
// value = 1. - fract(rainTime); // TODO: loop
return log(value * 1.25) * 3.;
}
@@ -79,7 +83,7 @@ float applySunShowerBrightness(float brightness, vec2 screenPos) {
float applyThunderBrightness(float brightness, float simTime, vec2 screenPos) {
simTime *= 0.5;
float thunder = 1. - fract((simTime + 0.3 * sin(SQRT_2 * simTime) + 0.2 * sin(SQRT_5 * simTime)));
float thunder = 1. - fract(wobble(simTime));
// thunder = 1. - fract(simTime + 0.3); // TODO: loop
thunder = log(thunder * 1.5) * 4.;
@@ -93,7 +97,7 @@ float applyRippleEffect(float effect, float simTime, vec2 screenPos) {
return effect;
}
float rippleTime = (simTime * 0.5 + 0.2 * sin(simTime)) * rippleSpeed + 1.;
float rippleTime = (simTime * 0.5 + sin(simTime) * 0.2) * rippleSpeed + 1.; // TODO: clarify
// rippleTime = (simTime * 0.5) * rippleSpeed + 1.; // TODO: loop
vec2 offset = randomVec2(vec2(floor(rippleTime), 0.)) - 0.5;