private Vector2 GenerateRandomOffset()
{
Vector2 result = new Vector2(HaltonSeq.Get((sampleIndex & 0x3FF) + 1, 2) - 0.5f, HaltonSeq.Get((sampleIndex & 0x3FF) + 1, 3) - 0.5f);
if (++sampleIndex >= 8)
{
sampleIndex = 0;
}
return(result);
}
Vector2 GetRandomOffset()
{
// 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
);
return(offset);
}
public override void Render(PostProcessRenderContext context)
{
#if POSTFX_DEBUG_STATIC_GRAIN
// Chosen by a fair dice roll
float time = 4f;
float rndOffsetX = 0f;
float rndOffsetY = 0f;
#else
var time = Time.realtimeSinceStartup;
var rndOffsetX = HaltonSeq.Get(m_SampleIndex & 1023, 2);
var rndOffsetY = HaltonSeq.Get(m_SampleIndex & 1023, 3);
if (++m_SampleIndex >= k_SampleCount)
{
m_SampleIndex = 0;
}
#endif
// Generate the grain lut for the current frame first
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();
}
var sheet = context.propertySheets.Get(context.resources.shaders.grainBaker);
sheet.properties.Clear();
sheet.properties.SetFloat(ShaderIDs.Phase, time % 10f);
context.command.BeginSample("GrainLookup");
context.command.BlitFullscreenTriangle(BuiltinRenderTextureType.None, m_GrainLookupRT, sheet,
settings.colored.value ? 1 : 0);
context.command.EndSample("GrainLookup");
// Send everything to the uber shader
var uberSheet = context.uberSheet;
uberSheet.EnableKeyword("GRAIN");
uberSheet.properties.SetTexture(ShaderIDs.GrainTex, m_GrainLookupRT);
uberSheet.properties.SetVector(ShaderIDs.Grain_Params1,
new Vector2(settings.lumContrib.value, settings.intensity.value * 20f));
uberSheet.properties.SetVector(ShaderIDs.Grain_Params2,
new Vector4(context.width / (float)m_GrainLookupRT.width / settings.size.value,
context.height / (float)m_GrainLookupRT.height / settings.size.value, rndOffsetX, rndOffsetY));
}
Vector2 GenerateRandomOffset()
{
var offset = new Vector2(
HaltonSeq.Get(m_SampleIndex & 1023, 2),
HaltonSeq.Get(m_SampleIndex & 1023, 3)
);
if (++m_SampleIndex >= k_SampleCount)
{
m_SampleIndex = 0;
}
return(offset);
}
private 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((m_SampleIndex & 1023) + 1, 2) - 0.5f,
HaltonSeq.Get((m_SampleIndex & 1023) + 1, 3) - 0.5f
);
if (++m_SampleIndex >= k_SampleCount)
{
m_SampleIndex = 0;
}
return(offset);
}
