#include <tessellation_entry.cg>

//--------------------------------------------------------------------------------------
// Textures
//--------------------------------------------------------------------------------------
DECLARE_TEXTURE_3D(displacementTexture)

//--------------------------------------------------------------------------------------
// Functions
//--------------------------------------------------------------------------------------

void computeOffsetAndNormal(in float3 localPos, in float3 faceNormal, in float3 baryCoords,
                            inout float3 vOffset, inout float3 vNormal)
{
	// There is a slight discrepancy between procedural and textured
	// noise, easily fixed by a constant multiplier
	static const float multiplier = .35;
	float4 texOffset = displacementTexture.SampleLevel(displacementTextureSamplerState, localPos * g_tessUVScale.x, 0);
	vOffset = texOffset.xyz * multiplier;

	// TODO: use iNoiseNormal
	vNormal = faceNormal;
}