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);
}
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
float time = Time.realtimeSinceStartup;
float rndOffsetX = HaltonSeq.Get(m_SampleIndex & 1023, 2);
float 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(Uniforms._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(Uniforms._GrainTex, m_GrainLookupRT);
uberSheet.properties.SetVector(Uniforms._Grain_Params1, new Vector2(settings.lumContrib.value, settings.intensity.value * 20f));
uberSheet.properties.SetVector(Uniforms._Grain_Params2, new Vector4((float)context.width / (float)m_GrainLookupRT.width / settings.size.value, (float)context.height / (float)m_GrainLookupRT.height / settings.size.value, rndOffsetX, rndOffsetY));
}
