Vector2 GenerateRandomOffset()
{
var offset = new Vector2(
HaltonSeq.Get((sampleIndex & 1023) + 1, 2) - 0.5f,
HaltonSeq.Get((sampleIndex & 1023) + 1, 3) - 0.5f
);
if (++sampleIndex >= k_SampleCount)
{
sampleIndex = 0;
}
return(offset);
}
Vector2 GenerateRandomOffset()
{
// The variance between 0 and the actual halton sequence values reveals noticeable instability
// in Unity's shadow maps, so we avoid index 0.
var offset = new Vector2(
HaltonSeq.Get((sampleIndex & 1023) + 1, 2) - 0.5f,
HaltonSeq.Get((sampleIndex & 1023) + 1, 3) - 0.5f
);
if (++sampleIndex >= k_SampleCount)
{
sampleIndex = 0;
}
return(offset);
}
public override void Render(PostProcessRenderContext context)
{
float realtimeSinceStartup = Time.realtimeSinceStartup;
float z = HaltonSeq.Get(m_SampleIndex & 0x3FF, 2);
float w = HaltonSeq.Get(m_SampleIndex & 0x3FF, 3);
if (++m_SampleIndex >= 1024)
{
m_SampleIndex = 0;
}
if (m_GrainLookupRT == null || !m_GrainLookupRT.IsCreated())
{
RuntimeUtilities.Destroy(m_GrainLookupRT);
m_GrainLookupRT = new RenderTexture(128, 128, 0, GetLookupFormat())
{
filterMode = FilterMode.Bilinear,
wrapMode = TextureWrapMode.Repeat,
anisoLevel = 0,
name = "Grain Lookup Texture"
};
m_GrainLookupRT.Create();
}
PropertySheet propertySheet = context.propertySheets.Get(context.resources.shaders.grainBaker);
propertySheet.properties.Clear();
propertySheet.properties.SetFloat(ShaderIDs.Phase, realtimeSinceStartup % 10f);
context.command.BeginSample("GrainLookup");
context.command.BlitFullscreenTriangle(BuiltinRenderTextureType.None, m_GrainLookupRT, propertySheet, base.settings.colored.value ? 1 : 0);
context.command.EndSample("GrainLookup");
PropertySheet uberSheet = context.uberSheet;
uberSheet.EnableKeyword("GRAIN");
uberSheet.properties.SetTexture(ShaderIDs.GrainTex, m_GrainLookupRT);
uberSheet.properties.SetVector(ShaderIDs.Grain_Params1, new Vector2(base.settings.lumContrib.value, base.settings.intensity.value * 20f));
uberSheet.properties.SetVector(ShaderIDs.Grain_Params2, new Vector4((float)context.width / (float)m_GrainLookupRT.width / base.settings.size.value, (float)context.height / (float)m_GrainLookupRT.height / base.settings.size.value, z, w));
}