Added HLSL shaders for order independent transparency sample

data/shaders/hlsl/oit/geometry.frag

@@ -0,0 +1,56 @@
+// Copyright 2020 Sascha Willems
+
+#define MAX_FRAGMENT_COUNT 75
+
+struct VSOutput
+{
+	float4 Pos : SV_POSITION;
+};
+
+struct Node
+{
+    float4 color;
+    float depth;
+    uint next;
+};
+
+struct ObjectUBO
+{
+    float4x4 model;
+    float4 color;
+};
+
+cbuffer ubo : register(b1) { ObjectUBO objectUBO; }
+
+struct GeometrySBO
+{
+    uint count;
+    uint maxNodeCount;
+};
+// Binding 0 : Position storage buffer
+RWStructuredBuffer<GeometrySBO> geometrySBO : register(u2);
+
+RWTexture2D<uint> headIndexImage : register(u3);
+
+RWStructuredBuffer<Node> nodes : register(u4);
+
+[earlydepthstencil]
+void main(VSOutput input)
+{
+    // Increase the node count
+    uint nodeIdx;
+    InterlockedAdd(geometrySBO[0].count, 1, nodeIdx);
+
+    // Check LinkedListSBO is full
+    if (nodeIdx < geometrySBO[0].maxNodeCount)
+    {
+        // Exchange new head index and previous head index
+        uint prevHeadIdx;
+        InterlockedExchange(headIndexImage[uint2(input.Pos.xy)], nodeIdx, prevHeadIdx);
+
+        // Store node data
+        nodes[nodeIdx].color = objectUBO.color;
+        nodes[nodeIdx].depth = input.Pos.z;
+        nodes[nodeIdx].next = prevHeadIdx;
+    }
+}