#include "stereokit.hlsli"

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

float4       color;

struct vsIn {
	float4 pos  : SV_Position;
	float3 norm : NORMAL0;
};
struct psIn {
	float4 pos   : SV_POSITION;
	float3 col_pos : TEXCOORD0;
	float4 color : COLOR0;
	uint view_id : SV_RenderTargetArrayIndex;
};

float f_inv(float x) {
	if (x >= 0.04045) {
		return pow((x + 0.055)/(1 + 0.055), 2.4);
	}
	
	return x / 12.92;
}

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]);
	o.col_pos    = input.pos.xyz + float3(0.5, 0.5, 0.5);

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

	o.color = color * sk_inst[id].color;
	return o;
}

float4 ps(psIn input) : SV_TARGET {
	// pos to color
	float3 col = float3(input.col_pos);
	
	// linear to sRGB
	return float4(f_inv(col.r), f_inv(col.g), f_inv(col.b), 1);
}