#include "stereokit.hlsli"

//--name = dofdev/backbox
//--color:color = 1, 1, 1, 1

float4       color;

struct vsIn {
	float4 pos  : SV_Position;
	float3 norm : NORMAL0;
	float4 col  : COLOR0;
};
struct psIn {
	float4 pos   : SV_POSITION;
	float4 color : COLOR0;
	uint view_id : SV_RenderTargetArrayIndex;
};

psIn vs(vsIn input, uint id : SV_InstanceID) {
	psIn o;
	o.view_id = id % sk_view_count;
	id        = id / sk_view_count;

	float3 world = mul(float4(input.pos.xyz, 1), sk_inst[id].world).xyz;
	o.pos        = mul(float4(world,         1), sk_viewproj[o.view_id]);

	float3 normal = normalize(mul(input.norm, (float3x3)sk_inst[id].world));


	float3 norm_shade = float3(0.5) + (normal * 0.5);
	// float3 norm_shade = float3(0.5) + (norm_color * 0.5);
  float3 view_dir = normalize(world - sk_camera_pos[o.view_id]);
  // o.color = norm_shaed * clamp(dot(o.normal, -view_dir), 0, 0.2);

  // rim lighting
  float rim = 1.0 - saturate(dot(normalize(view_dir), normal));
  o.color = float4(norm_shade * rim * rim * 0.2, 1);

	return o;
}
float4 ps(psIn input) : SV_TARGET {
	return input.color;
}