Start working on Cluster;

Runtime/Shader/Includes/Common.hlsl

@@ -0,0 +1,31 @@
+#ifndef VOLUME_COMMON
+#define VOLUME_COMMON
+
+#define _MAX_CLUSTER_COUNT 16
+#define _DEPTH_STEP (1.0 / _MAX_CLUSTER_COUNT)
+
+float4 ComputePositionNDC(float4 positionCS, float projectionSign)
+{
+    float4 positionNDC = positionCS * 0.5f;
+    positionNDC.xy = float2(positionNDC.x, positionNDC.y * projectionSign) + positionNDC.w;
+    positionNDC.zw = positionCS.zw;
+    return positionNDC;
+}
+
+uint GetClusterIndex(float linearDepth)
+{
+    return (uint)clamp(floor(linearDepth / _DEPTH_STEP), 0.0, (float)_MAX_CLUSTER_COUNT - 1.0);
+}
+
+void GetClusterVolumeCount(uint clusterIndex, out uint count)
+{
+    // TODO
+}
+
+uint FetchVolumeIndex(uint clusterIndex, uint offset)
+{
+    // TODO
+    return 0;
+}
+
+#endif