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/pbrbasic/pbr.vert

@@ -0,0 +1,39 @@
+// Copyright 2020 Google LLC
+
+struct VSInput
+{
+[[vk::location(0)]] float3 Pos : POSITION0;
+[[vk::location(1)]] float3 Normal : NORMAL0;
+};
+
+struct UBO
+{
+	float4x4 projection;
+	float4x4 model;
+	float4x4 view;
+	float3 camPos;
+};
+
+cbuffer ubo : register(b0) { UBO ubo; }
+
+struct VSOutput
+{
+	float4 Pos : SV_POSITION;
+[[vk::location(0)]] float3 WorldPos : POSITION0;
+[[vk::location(1)]] float3 Normal : NORMAL0;
+};
+
+struct PushConsts {
+	float3 objPos;
+};
+[[vk::push_constant]] PushConsts pushConsts;
+
+VSOutput main(VSInput input)
+{
+	VSOutput output = (VSOutput)0;
+	float3 locPos = mul(ubo.model, float4(input.Pos, 1.0)).xyz;
+	output.WorldPos = locPos + pushConsts.objPos;
+	output.Normal = mul((float3x3)ubo.model, input.Normal);
+	output.Pos = mul(ubo.projection, mul(ubo.view, float4(output.WorldPos, 1.0)));
+	return output;
+}