vertForwardBase-function.shader

struct VertexOutputForwardBase
{
	float4 pos							: SV_POSITION;
	float4 tex							: TEXCOORD0;
	half3 eyeVec 						: TEXCOORD1;
	half4 tangentToWorldAndParallax[3]	: TEXCOORD2;	// [3x3:tangentToWorld | 1x3:viewDirForParallax]
	half4 ambientOrLightmapUV			: TEXCOORD5;	// SH or Lightmap UV
	SHADOW_COORDS(6)
	UNITY_FOG_COORDS(7)

	// next ones would not fit into SM2.0 limits, but they are always for SM3.0+
	#if UNITY_SPECCUBE_BOX_PROJECTION
		float3 posWorld					: TEXCOORD8;
	#endif
};

VertexOutputForwardBase vertForwardBase (VertexInput v)
{
	VertexOutputForwardBase o;
	UNITY_INITIALIZE_OUTPUT(VertexOutputForwardBase, o);

	float4 posWorld = mul(_Object2World, v.vertex);
	#if UNITY_SPECCUBE_BOX_PROJECTION
		o.posWorld = posWorld.xyz;
	#endif
	o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
	o.tex = TexCoords(v);
	o.eyeVec = NormalizePerVertexNormal(posWorld.xyz - _WorldSpaceCameraPos);
	float3 normalWorld = UnityObjectToWorldNormal(v.normal);
	#ifdef _TANGENT_TO_WORLD
		float4 tangentWorld = float4(UnityObjectToWorldDir(v.tangent.xyz), v.tangent.w);

		float3x3 tangentToWorld = CreateTangentToWorldPerVertex(normalWorld, tangentWorld.xyz, tangentWorld.w);
		o.tangentToWorldAndParallax[0].xyz = tangentToWorld[0];
		o.tangentToWorldAndParallax[1].xyz = tangentToWorld[1];
		o.tangentToWorldAndParallax[2].xyz = tangentToWorld[2];
	#else
		o.tangentToWorldAndParallax[0].xyz = 0;
		o.tangentToWorldAndParallax[1].xyz = 0;
		o.tangentToWorldAndParallax[2].xyz = normalWorld;
	#endif
	//We need this for shadow receving
	TRANSFER_SHADOW(o);

	// Static lightmaps
	#ifndef LIGHTMAP_OFF
		o.ambientOrLightmapUV.xy = v.uv1.xy * unity_LightmapST.xy + unity_LightmapST.zw;
		o.ambientOrLightmapUV.zw = 0;
	// Sample light probe for Dynamic objects only (no static or dynamic lightmaps)
	#elif UNITY_SHOULD_SAMPLE_SH
		#if UNITY_SAMPLE_FULL_SH_PER_PIXEL
			o.ambientOrLightmapUV.rgb = 0;
		#elif (SHADER_TARGET < 30)
			o.ambientOrLightmapUV.rgb = ShadeSH9(half4(normalWorld, 1.0));
		#else
			// Optimization: L2 per-vertex, L0..L1 per-pixel
			o.ambientOrLightmapUV.rgb = ShadeSH3Order(half4(normalWorld, 1.0));
		#endif
		// Add approximated illumination from non-important point lights
		#ifdef VERTEXLIGHT_ON
			o.ambientOrLightmapUV.rgb += Shade4PointLights (
				unity_4LightPosX0, unity_4LightPosY0, unity_4LightPosZ0,
				unity_LightColor[0].rgb, unity_LightColor[1].rgb, unity_LightColor[2].rgb, unity_LightColor[3].rgb,
				unity_4LightAtten0, posWorld, normalWorld);
		#endif
	#endif

	#ifdef DYNAMICLIGHTMAP_ON
		o.ambientOrLightmapUV.zw = v.uv2.xy * unity_DynamicLightmapST.xy + unity_DynamicLightmapST.zw;
	#endif
	
	#ifdef _PARALLAXMAP
		TANGENT_SPACE_ROTATION;
		half3 viewDirForParallax = mul (rotation, ObjSpaceViewDir(v.vertex));
		o.tangentToWorldAndParallax[0].w = viewDirForParallax.x;
		o.tangentToWorldAndParallax[1].w = viewDirForParallax.y;
		o.tangentToWorldAndParallax[2].w = viewDirForParallax.z;
	#endif
	
	UNITY_TRANSFER_FOG(o,o.pos);
	return o;
}