csgo/cstrike15_src/materialsystem/stdshaders/portalstaticoverlay_vs20.fxc

// STATIC: "MODEL"				"0..1"
// STATIC: "PORTALGHOSTOVERLAY"	"0..2"

// DYNAMIC: "SKINNING"		"0..1"

#include "common_vs_fxc.h"

static const bool g_bSkinning	= SKINNING ? true : false;
static const bool g_bModel		= MODEL ? true : false;

struct VS_INPUT
{
	float4 vPos							: POSITION;
	float3 vNormal						: NORMAL;

	#if ( PORTALGHOSTOVERLAY )
		float4 vGhostTintColor			: COLOR;
	#endif

	float4 vBoneWeights					: BLENDWEIGHT;
	float4 vBoneIndices					: BLENDINDICES;
	float2 vTexCoord					: TEXCOORD0;
};


struct VS_OUTPUT
{
	float4 vProjPos					: POSITION;
	float4 vColor					: COLOR;
	float2 vTexCoord1				: TEXCOORD0;
	float2 vTexCoord2				: TEXCOORD1; //just a copy of vTexCoord1, ps11 compatibility issue
	
#if !defined( _X360 ) && !defined( SHADER_MODEL_VS_3_0 )
	float fog						: FOG;
#endif
	
	float4 worldPos_projPosZ		: TEXCOORD7;		// Necessary for pixel fog
};


VS_OUTPUT main( VS_INPUT v )
{
	VS_OUTPUT o = ( VS_OUTPUT )0;

	#if ( PORTALGHOSTOVERLAY )
	{
		// Offset these by one unit so we can do a z-fail render and force it to be in front of the wall.
		// I don't want to modify the mesh since we're getting close to shipping. This ensures the offset
		// is isolated to the ghost render only and not the other portal render passes.
		v.vPos.xyz += v.vNormal.xyz;
	}
	#endif

	float3 worldPos;
	if( MODEL == 1 )
	{
		SkinPosition( 
				g_bSkinning, 
				v.vPos,
				v.vBoneWeights, v.vBoneIndices,
				worldPos );
	}
	else
	{
		worldPos = mul3x3( v.vPos.xyz, ( float3x3 )cModel[0] );
	}
	
	o.vProjPos = mul( float4( worldPos, 1 ), cViewProj );
	
#ifdef _PS3
	// Account for OpenGL's flipped y coordinate and expanded z range [-1,1] instead of [0,1]
	o.vProjPos.y = -o.vProjPos.y;
	o.vProjPos.z = 2.0f * o.vProjPos.z - o.vProjPos.w;
#endif // _PS3


	o.worldPos_projPosZ = float4( worldPos.xyz, o.vProjPos.z );
	o.vTexCoord1 = v.vTexCoord.xy;
	o.vTexCoord2 = v.vTexCoord.xy;
	
#if !defined( _X360 ) && !defined( SHADER_MODEL_VS_3_0 )
	o.fog = CalcFixedFunctionFog( worldPos, FOGTYPE_RANGE );
#endif

	o.vColor.rgba = float4( 1, 1, 1, 1 );

#if ( PORTALGHOSTOVERLAY )
	{
		#if ( PORTALGHOSTOVERLAY == 1 )
		{
			o.vColor.rgba = float4( v.vGhostTintColor.rgb, 1 );
		}
		#endif

		float3 vViewRayWs = worldPos.xyz - cEyePos.xyz;

		// If we're facing away, always be full strength
		float flDot = dot( v.vNormal.xyz, vViewRayWs.xyz );

		if ( flDot <= 0.0f )
		{
			// if we're facing towards the viewer, take distance into account

			float flDistSqr = dot( vViewRayWs.xyz, vViewRayWs.xyz );
			o.vColor.a = saturate( ( flDistSqr - ( 120.0f * 120.0f ) ) / ( ( 240.0f * 240.0f ) - ( 120.0f * 120.0f ) ) );	// Remap 120..240 distance to 0..1
		}	

		// Factor how "open" this portal is, but don't lerp in the visibility until the portal is 85% open...otherwise
		//    the colored oval becomes visible before the portal's firey border is fully open.
		o.vColor.a *= v.vGhostTintColor.a;
	}
#endif


	return o;
}