Add shaders re-implemented in HLSL

These were written against the shaders at revision eddd724e7.
There have been changes made since then, which will need to be mirrored.

See `data/hlsl/README.md` for the current status of each sample.

data/hlsl/displacement/base.frag

@@ -0,0 +1,26 @@
+// Copyright 2020 Google LLC
+
+Texture2D textureColorMap : register(t2);
+SamplerState samplerColorMap : register(s2);
+
+struct DSOutput
+{
+[[vk::location(0)]] float3 Normal : NORMAL0;
+[[vk::location(1)]] float2 UV : TEXCOORD0;
+[[vk::location(2)]] float3 EyePos : POSITION0;
+[[vk::location(3)]] float3 LightVec : TEXCOORD2;
+};
+
+float4 main(DSOutput input) : SV_TARGET
+{
+	float3 N = normalize(input.Normal);
+	float3 L = normalize(float3(1.0, 1.0, 1.0));
+
+	float3 Eye = normalize(-input.EyePos);
+	float3 Reflected = normalize(reflect(-input.LightVec, input.Normal));
+
+	float4 IAmbient = float4(0.0, 0.0, 0.0, 1.0);
+	float4 IDiffuse = float4(1.0, 1.0, 1.0, 1.0) * max(dot(input.Normal, input.LightVec), 0.0);
+
+	return float4((IAmbient + IDiffuse) * float4(textureColorMap.Sample(samplerColorMap, input.UV).rgb, 1.0));
+}