random float

runtime/templates/shader_wrapper.slang.in

@@ -13,6 +13,7 @@ struct ShaderContext
 	float time;
 	float utcTimeSeconds;
 	float utcOffsetSeconds;
+	float startupRandom;
 	float frameCount;
 	float mixAmount;
 	float bypass;
@@ -27,6 +28,7 @@ cbuffer GlobalParams
 	float2 gOutputResolution;
 	float gUtcTimeSeconds;
 	float gUtcOffsetSeconds;
+	float gStartupRandom;
 	float gFrameCount;
 	float gMixAmount;
 	float gBypass;
@@ -86,6 +88,7 @@ float4 fragmentMain(FragmentInput input) : SV_Target
 	context.time = gTime;
 	context.utcTimeSeconds = gUtcTimeSeconds;
 	context.utcOffsetSeconds = gUtcOffsetSeconds;
+	context.startupRandom = gStartupRandom;
 	context.frameCount = gFrameCount;
 	context.mixAmount = gMixAmount;
 	context.bypass = gBypass;