added random seed

README.md

@@ -237,10 +237,8 @@ If `SLANG_ROOT` is not set, the workflow falls back to the repo-local default un
 - Add WebView2
 - move to MSDF, typography rasterisation
 - better shader search UI
-- LUT applicator
 - More comprehensive greenscreen shader
-- 16bit float render target, linear compositing?
-- add 10bit output path decklink
+- linear compositing?
 - compute shaders or a small 1x1 or nx1 RGBA16f render target for abritary data store
 - allow shaders to read other shaders data store based on name? or putput over OSC
 - Mipmappong needed?

shaders/balatro-swirl/shader.slang

@@ -1,21 +1,22 @@
-float4 balatroSwirl(float2 screenSize, float2 screenCoords, float time)
+float4 balatroSwirl(float2 screenSize, float2 screenCoords, float time, float seed)
 {
 	const float pi = 3.14159265359;
 	float safeScreenLength = max(length(screenSize), 1.0);
-	float2 uv = (screenCoords - 0.5 * screenSize) / safeScreenLength - offset;
+	float2 seedOffset = float2(sin(seed * 6.2831853), cos(seed * 6.2831853)) * 0.035;
+	float2 uv = (screenCoords - 0.5 * screenSize) / safeScreenLength - offset - seedOffset;
 	float uvLength = length(uv);
 
 	float speed = spinRotation * spinEase * 0.2;
 	if (isRotate)
 		speed = time * speed;
-	speed += 302.2;
+	speed += 302.2 + seed * 6.2831853;
 
 	float newPixelAngle = atan2(uv.y, uv.x) + speed - spinEase * 20.0 * (spinAmount * uvLength + (1.0 - spinAmount));
 	float2 mid = (screenSize / safeScreenLength) * 0.5;
 	uv = float2(uvLength * cos(newPixelAngle) + mid.x, uvLength * sin(newPixelAngle) + mid.y) - mid;
 
 	uv *= 30.0;
-	speed = time * spinSpeed;
+	speed = (time + seed * 17.0) * spinSpeed;
 	float2 uv2 = float2(uv.x + uv.y, uv.x + uv.y);
 
 	for (int i = 0; i < 5; ++i)
@@ -42,6 +43,6 @@ float4 balatroSwirl(float2 screenSize, float2 screenCoords, float time)
 float4 shadeVideo(ShaderContext context)
 {
 	float2 screenSize = max(context.outputResolution, float2(1.0, 1.0));
-	float4 swirl = balatroSwirl(screenSize, context.uv * screenSize, context.time);
+	float4 swirl = balatroSwirl(screenSize, context.uv * screenSize, context.time, context.startupRandom);
 	return saturate(lerp(swirl, context.sourceColor, sourceMix));
 }

shaders/data-mosh/shader.slang

@@ -7,12 +7,14 @@ float4 shadeVideo(ShaderContext context)
 {
 	float2 blocks = max(blockCount, float2(1.0, 1.0));
 	float2 blockId = floor(context.uv * blocks);
-	float n = hash21(blockId + floor(context.time * 8.0));
+	float seed = context.startupRandom * 4096.0;
+	float frameSeed = floor(context.time * 8.0);
+	float n = hash21(blockId + float2(frameSeed + seed, frameSeed + seed * 0.17));
 	float historyFrame = floor(lerp(1.0, 7.0, n));
 
-	float rowNoise = hash21(float2(floor(context.uv.y * blocks.y), floor(context.time * 5.0)));
+	float rowNoise = hash21(float2(floor(context.uv.y * blocks.y) + seed * 0.37, floor(context.time * 5.0) + seed * 0.13));
 	float tear = (rowNoise * 2.0 - 1.0) * tearAmount * amount * 0.08;
-	float2 offset = float2(tear, (hash21(blockId + 19.0) * 2.0 - 1.0) * amount * 0.025);
+	float2 offset = float2(tear, (hash21(blockId + float2(19.0 + seed, 19.0 + seed * 0.31)) * 2.0 - 1.0) * amount * 0.025);
 	float2 moshedUv = clamp(context.uv + offset, 0.0, 1.0);
 
 	float4 previous = sampleTemporalHistory(int(historyFrame), moshedUv);

shaders/dvd-bounce/shader.slang

@@ -29,7 +29,8 @@ float4 shadeVideo(ShaderContext context)
 	float2 velocityPx = float2(
 		max(20.0, bounceSpeed * minDimension * 1.00),
 		max(24.0, bounceSpeed * minDimension * 0.77));
-	float2 motionPx = context.time * velocityPx;
+	float seed = context.startupRandom;
+	float2 motionPx = (float2(context.time, context.time) + float2(seed * 32.7, seed * 40.3)) * velocityPx;
 	float2 centerPx = minCenterPx + float2(
 		pingPong(motionPx.x, travelPx.x),
 		pingPong(motionPx.y, travelPx.y));
@@ -38,7 +39,7 @@ float4 shadeVideo(ShaderContext context)
 	int yHits = int(floor(motionPx.y / max(travelPx.y, 1.0)));
 	int totalHits = max(0, xHits + yHits);
 
-	float hue = frac(0.09 + float(totalHits) * 0.173);
+	float hue = frac(0.09 + seed * 0.71 + float(totalHits) * 0.173);
 	float3 badgeColor = hsvToRgb(float3(hue, 0.86, 1.0));
 	float3 glowColor = hsvToRgb(float3(frac(hue + 0.06), 0.72, 1.0));
 

shaders/ether/shader.slang

@@ -20,14 +20,15 @@ float4 shadeVideo(ShaderContext context)
 	float2 resolution = max(context.outputResolution, float2(1.0, 1.0));
 	float2 fragCoord = context.uv * resolution;
 	float2 p = fragCoord / resolution.y - offset;
-	float time = context.time * speed;
+	float seed = context.startupRandom;
+	float time = context.time * speed + seed * 41.0;
 
 	float3 color = float3(0.0, 0.0, 0.0);
 	float d = depth;
 
 	for (int i = 0; i <= 5; ++i)
 	{
-		float3 rayPosition = float3(0.0, 0.0, 5.0) + normalize(float3(p, -1.0)) * d;
+		float3 rayPosition = float3(seed * 0.7 - 0.35, 0.23 - seed * 0.46, 5.0) + normalize(float3(p, -1.0)) * d;
 		float rz = etherMap(rayPosition, time);
 		float f = clamp((rz - etherMap(rayPosition + float3(0.1, 0.1, 0.1), time)) * 0.5, -0.1, 1.0);
 		float3 light = baseColor.rgb + energyColor.rgb * 5.0 * f;

shaders/happy-accident/shader.slang

@@ -24,12 +24,13 @@ float4 shadeVideo(ShaderContext context)
 	float2 resolution = max(context.outputResolution, float2(1.0, 1.0));
 	float2 fragCoord = context.uv * resolution;
 	float2 normalizedCoord = (fragCoord - 0.5 * resolution) / resolution.y / max(scale, 0.001);
-	float time = context.time * speed;
+	float seed = context.startupRandom;
+	float time = context.time * speed + seed * 53.0;
 	float timeCos = cos(0.1 * time);
 	float3 direction = normalize(float3(normalizedCoord, 1.0));
-	float3 origin = float3(0.0, 0.0, time);
+	float3 origin = float3(seed * 0.4 - 0.2, 0.2 - seed * 0.4, time);
 
-	float z = happyNoise(fragCoord);
+	float z = happyNoise(fragCoord + seed * resolution.yx);
 	float distanceToSurface = 0.0;
 	float4 accumulated = float4(0.0, 0.0, 0.0, 0.0);
 	float clampedSteps = clamp(raySteps, 1.0, 77.0);

shaders/singularity/shader.slang

@@ -14,13 +14,14 @@ float4 shadeVideo(ShaderContext context)
 	float safeScale = max(scale, 0.001);
 	float safeRingRadius = max(ringRadius, 0.001);
 	float safeTightness = max(tightness, 0.001);
-	float time = context.time * speed;
+	float seed = context.startupRandom;
+	float time = context.time * speed + seed * 37.0;
 
 	float2 p = (fragCoord + fragCoord - resolution) / resolution.y / safeScale;
-	p -= center;
+	p -= center + float2(sin(seed * 6.2831853), cos(seed * 6.2831853)) * 0.035;
 
 	float iterator = 0.2;
-	float2 diagonal = float2(-1.0, 1.0);
+	float2 diagonal = normalize(float2(-1.0 + seed * 0.5, 1.0 - seed * 0.35));
 	float2 blackholeCenter = p - iterator * diagonal;
 	float gravity = iterator * strength / max(dot(blackholeCenter, blackholeCenter), 0.0001);
 	float2 skew = diagonal / (0.1 + gravity);

shaders/vhs/shader.slang

@@ -161,15 +161,16 @@ float3 blurVhs(float2 uv, float d, int sampleCount)
 float4 shadeVideo(ShaderContext context)
 {
 	float2 uv = context.uv;
-	float framecount = frac(context.time * wiggleSpeed / 7.0) * 7.0;
+	float time = context.time + context.startupRandom * 113.0;
+	float framecount = frac(time * wiggleSpeed / 7.0) * 7.0;
 	int sampleCount = int(clamp(blurSamples, 3.0, 15.0) + 0.5);
 
-	float d = 0.1 - round(frac(context.time / 3.0)) * 0.1;
+	float d = 0.1 - round(frac(time / 3.0)) * 0.1;
 	uv = jumpy(uv, framecount);
-	float s = 0.0001 * -d + 0.0001 * wiggle * sin(context.time * wiggleSpeed);
+	float s = 0.0001 * -d + 0.0001 * wiggle * sin(time * wiggleSpeed);
 	float e = min(0.30, pow(max(0.0, cos(uv.y * 4.0 + 0.3) - 0.75) * (s + 0.5), 3.0)) * 25.0;
 	float r = 250.0 * (2.0 * s);
-	uv.x += abs(r * pow(min(0.003, (-uv.y + (0.01 * frac(context.time / 5.0) * 5.0))) * 3.0, 2.0)) * wiggle;
+	uv.x += abs(r * pow(min(0.003, (-uv.y + (0.01 * frac(time / 5.0) * 5.0))) * 3.0, 2.0)) * wiggle;
 
 	d = 0.051 + abs(sin(s / 4.0));
 	float c = max(0.0001, 0.002 * d) * smear;
@@ -212,7 +213,7 @@ float4 shadeVideo(ShaderContext context)
 	color = lerp(color, bloomSource, bloomAmount * 0.18);
 	color += bloomSource * float3(1.0, 0.96, 0.92) * bloomMask * 0.24;
 
-	float3 speckle = animatedChromaGrain(context.uv, context.time, context.outputResolution, noiseSize);
+	float3 speckle = animatedChromaGrain(context.uv, time, context.outputResolution, noiseSize);
 	float luma = dot(color, float3(0.299, 0.587, 0.114));
 	float noiseMask = lerp(0.65, 1.0, 1.0 - saturate(luma));
 	float chunkiness = lerp(1.0, 2.4, saturate((noiseSize - 1.0) / 5.0));
@@ -221,7 +222,7 @@ float4 shadeVideo(ShaderContext context)
 	color.rg = lerp(color.rg, float2(color.r, color.g) + speckle.xy * noiseAmount * 0.2 * chunkiness, 0.35);
 	color.b = lerp(color.b, color.b + speckle.z * noiseAmount * 0.28 * chunkiness, 0.5);
 
-	float3 staticNoise = analogStatic(context.uv, context.time, context.outputResolution);
+	float3 staticNoise = analogStatic(context.uv, time, context.outputResolution);
 	float staticMask = lerp(0.45, 1.15, 1.0 - saturate(luma));
 	color += staticNoise * staticAmount * staticMask;
 	color = lerp(color, color + float3(staticNoise.r * 0.22, staticNoise.g * 0.08, -staticNoise.b * 0.08), saturate(staticAmount * 2.0));

shaders/video-cube/shader.json

@@ -36,7 +36,7 @@
       "id": "backgroundMix",
       "label": "Background Mix",
       "type": "float",
-      "default": 0.15,
+      "default": 0.0,
       "min": 0.0,
       "max": 1.0,
       "step": 0.01

shaders/video-cube/shader.slang

@@ -75,7 +75,7 @@ float4 shadeVideo(ShaderContext context)
 	float3 rayOrigin = float3(0.0, 0.0, 2.7);
 	float3 rayDirection = normalize(float3(centeredUv, -2.1));
 
-	float spin = context.time * spinSpeed;
+	float spin = context.time * spinSpeed + context.startupRandom * 6.2831853;
 	float yaw = spin;
 	float pitch = spin * 0.61 + 0.35;