Moved shaders to new directory

shaders/hlsl/gears/gears.frag

@@ -0,0 +1,22 @@
+// Copyright 2020 Google LLC
+
+struct VSOutput
+{
+[[vk::location(0)]] float3 Normal : NORMAL0;
+[[vk::location(1)]] float3 Color : COLOR0;
+[[vk::location(2)]] float3 EyePos : POSITION0;
+[[vk::location(3)]] float3 LightVec : TEXCOORD2;
+};
+
+float4 main(VSOutput input) : SV_TARGET
+{
+  float3 Eye = normalize(-input.EyePos);
+  float3 Reflected = normalize(reflect(-input.LightVec, input.Normal));
+
+  float4 IAmbient = float4(0.2, 0.2, 0.2, 1.0);
+  float4 IDiffuse = float4(0.5, 0.5, 0.5, 0.5) * max(dot(input.Normal, input.LightVec), 0.0);
+  float specular = 0.25;
+  float4 ISpecular = float4(0.5, 0.5, 0.5, 1.0) * pow(max(dot(Reflected, Eye), 0.0), 0.8) * specular;
+
+  return float4((IAmbient + IDiffuse) * float4(input.Color, 1.0) + ISpecular);
+}