// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.

/*=============================================================================
	BasePassForForwardShadingCommon.usf: Base pass definitions used by both vertex and pixel shader
=============================================================================*/

#undef NEEDS_LIGHTMAP_COORDINATE

#define NEEDS_LIGHTMAP_COORDINATE		(LQ_TEXTURE_LIGHTMAP)
#define NEEDS_LIGHTMAP					(NEEDS_LIGHTMAP_COORDINATE)

#define USE_VERTEX_FOG					(!OUTPUT_GAMMA_SPACE)

#define PACK_INTERPOLANTS (USE_VERTEX_FOG && NUM_VF_PACKED_INTERPOLANTS > 0 && (ES2_PROFILE || ES3_1_PROFILE))
#define LANDSCAPE_BUG_WORKAROUND (IOS && IS_FORWARD_BASEPASS_VERTEX_SHADER && PACK_INTERPOLANTS)

#if METAL_PROFILE 
// @todo-rco: @todo metal: FIXME!
#define INTERP_TYPE float4
#else
#define INTERP_TYPE half4
#endif

struct FSharedForwardShadingBasePassInterpolants
{
#if USE_VERTEX_FOG && !PACK_INTERPOLANTS
	INTERP_TYPE VertexFog			: TEXCOORD7;
#endif
#if LANDSCAPE_BUG_WORKAROUND
	INTERP_TYPE DummyInterp		: DUMMY_INTERP;
#endif
	float4 PixelPosition	: TEXCOORD8; // xyz = world position, w = clip z

#if USE_WORLD_POSITION_EXCLUDING_SHADER_OFFSETS
	float3 PixelPositionExcludingWPO	: TEXCOORD9;
#endif
};

#define FForwardShadingBasePassInterpolantsVSToPS FSharedForwardShadingBasePassInterpolants