void GbufferV(  float4 position : POSITION,                float3 normal : NORMAL,                float2 texCoord : TEXCOORD0,				float3 tangent : TEXCOORD1,               out float4 oPosition : POSITION,			out float4 ObjPos : TEXCOORD4,			out float3 oNormal : TEXCOORD1,			out float3 oTangent : TEXCOORD2,            out float2 oTexCoord : TEXCOORD0,			 		uniform float4x4 ModelViewProj,        uniform float4x4 ModelToWorld,		uniform float4x4 ModelViewIT,		uniform float3 Sem,		uniform float3 eyePositionW )    {        	//Position Calculations	float4 pos = mul(ModelViewProj, position);	oPosition.xyzw = pos;		ObjPos.xyzw = mul( ModelToWorld, position);	oTexCoord = texCoord;	oNormal =  mul( (float3x3)ModelViewIT, normal );	oTangent = tangent;    	    }

float3x3 invert_3x3( float3x3 M ){	float D = determinant( M );			float3x3 T = transpose( M );		return float3x3(		cross( T[1], T[2] ),		cross( T[2], T[0] ),		cross( T[0], T[1] ) ) / D;	}float3x3 compute_tangent_frame( float3 N, float3 p, float2 uv ){	// Implemenataion with full matrix inverse	// straight from theory.    // get edge vectors of the pixel triangle    float3 dp1 = ddx( p );    float3 dp2 = ddy( p );    float2 duv1 = ddx( uv );    float2 duv2 = ddy( uv );    // solve the linear system    float3x3 M = float3x3( dp1, dp2, cross( dp1, dp2 ) );    float3x3 inverseM = invert_3x3( M );    float3 T = mul( inverseM, float3( duv1.x, duv2.x, 0 ) );    float3 B = mul( inverseM, float3( duv1.y, duv2.y, 0 ) );    // construct tangent frame     float maxLength = max( length(T), length(B) );    return float3x3( T / maxLength, B / maxLength, N );}float3 compress(float3 v){	return 0.5 * (v + 1.0);}float3 expand(float3 v){	return (2.0 * v) - 1.0;}struct fs_mrt{      float4 color0 : COLOR0;   float4 color1 : COLOR1;   float4 color2 : COLOR2;};fs_mrt GbufferF( float4 oPosition : TEXCOORD4,			     float2 oTexCoord : TEXCOORD0,			     float3 oNormal : TEXCOORD1,                 float3 Sem : TEXCOORD3,				 float3 oTangent : TEXCOORD2,				uniform sampler2D Textur, 		uniform sampler2D NormalMap,		uniform float4x4 ModelViewProj				)	{		fs_mrt OUT;		float3 Normal = oNormal;	    		float3 vnormal = tex2D(NormalMap, oTexCoord).xyz;		float4 diffuse = tex2D(Textur, oTexCoord);		float3 binormal = cross(oNormal, oTangent);				float3x3 TangentFrame = compute_tangent_frame( vnormal, oPosition.xyz, oTexCoord );				/*float3x3 rotMat= float3x3(oTangent,							binormal,							oNormal);*/				float3 snormal = mul( TangentFrame , vnormal );		OUT.color0 = float4( oPosition.xyz, Sem.x );		OUT.color1 = float4( snormal.xyz , Sem.y);		OUT.color2 = float4( diffuse.xyz , Sem.z );		return OUT;	}

void LightV( float4 position : POSITION,			float2 texcoord : TEXCOORD0,					out float4 oPosition : POSITION,		out float2 oTex : TEXCOORD0, 				uniform float4x4 ModelViewProj 		){	oPosition = mul(ModelViewProj, position);	oTex = texcoord;}

float3 expand(float3 v){	return (2.0 * v) - 1.0;}//Blinn-Phong Lighting model, uses RTs and light variables as input.//Note: Specular power causing black artifacts, commented out for now.void LightF(	float4 color : COLOR,			out float4 oColor : COLOR,		float2 texcoord : TEXCOORD0, 	uniform float3 lightColor,	uniform float3 lightPosition,	uniform float4 Ke,	uniform float4 Ka,	uniform float4 Kd,	uniform float4 Ks,	uniform float kC,	uniform float kL,	uniform float kQ,	uniform sampler2D pos,	uniform sampler2D nor,	uniform sampler2D dif,	uniform float3 eyeP	){	float4 ambient = float4( 0.0, 0.0, 0.0, 0.0);	float4 diffuse = float4( 0.0, 0.0, 0.0, 0.0);	float4 specular = float4( 0.0, 0.0, 0.0, 0.0);	//Sample the G-Buffer and Other Accumulation Buffer 	float4 position4 = tex2D(pos, texcoord);	float4 normal4 = tex2D(nor, texcoord);	float4 diffuse4 = tex2D(dif, texcoord);			float3 position3 = position4.xyz;	float3 normalS = normal4.xyz;//expand(normal4.xyz);	float3 normal3 = normalS;	float3 diffuse3 = diffuse4.xyz;	float3 sem = float3( position4.w , normal4.w, diffuse4.w);	float4 emission = sem.yyyy;	float4 shininess = sem.x;	float3 lightDir = float3(lightPosition.xyz - position3);	float d = length(lightDir);	lightDir = normalize(lightDir);		float attenuation = 1.0/(kC + kL * d + kQ *d *d);	float3 halfAngle = (lightDir + eyeP)/2.0;	float nDotLD = max(0.0, dot(lightDir, normal3 ) );	float nDotHA = max(0.0, dot(halfAngle, normal3 ) );	float spec_power;	if(nDotLD <= 0.0) {		spec_power = 0.0; }	else		spec_power = pow(nDotHA, shininess);	float4 LightColor = float4 (lightColor.xyz, 0.0f );	ambient = Ka;	diffuse = Kd * LightColor * nDotLD;// * attenuation; No attenuation for directional light.	specular = Ks * LightColor * spec_power * attenuation; //specular power still causing black artifacts	float4 colorr;	colorr= float4( diffuse3, 0.0);	oColor = (emission + ambient + diffuse) *colorr + specular;    	oColor = diffuse4; //for debugging purposes.