Effects file XNA Riemer

struct VertexToPixel
{
    float4 Position   	: POSITION;
    float4 Color		: COLOR0;
    float LightingFactor: TEXCOORD0;
    float2 TextureCoords: TEXCOORD1;
};

struct PixelToFrame
{
    float4 Color : COLOR0;
};

//------- Constants --------
float4x4 xView;
float4x4 xProjection;
float4x4 xWorld;
float3 xLightDirection;
float xAmbient;
bool xEnableLighting;

//------- Texture Samplers --------

Texture xTexture;
sampler TextureSampler = sampler_state { texture = <xTexture>; magfilter = LINEAR; minfilter = LINEAR; mipfilter=LINEAR; AddressU = Clamp; AddressV = Clamp;};

//------- Technique: Colored --------

VertexToPixel ColoredVS( float4 inPos : POSITION, float3 inNormal: NORMAL, float4 inColor: COLOR)
{
	VertexToPixel Output = (VertexToPixel)0;
	float4x4 preViewProjection = mul (xView, xProjection);
	float4x4 preWorldViewProjection = mul (xWorld, preViewProjection);

	Output.Position = mul(inPos, preWorldViewProjection);
	Output.Color = inColor;

	float3 Normal = normalize(mul(normalize(inNormal), xWorld));
	Output.LightingFactor = 1;
	if (xEnableLighting)
		Output.LightingFactor = dot(Normal, -xLightDirection);

	return Output;
}

PixelToFrame ColoredPS(VertexToPixel PSIn)
{
	PixelToFrame Output = (PixelToFrame)0;

	Output.Color = PSIn.Color;
	Output.Color.rgb *= saturate(PSIn.LightingFactor) + xAmbient;

	return Output;
}

technique Colored
{
	pass Pass0
	{
		VertexShader = compile vs_2_0 ColoredVS();
		PixelShader  = compile ps_2_0 ColoredPS();
	}
}

//------- Technique: Textured --------

VertexToPixel TexturedVS( float4 inPos : POSITION, float3 inNormal: NORMAL, float2 inTexCoords: TEXCOORD0)
{
	VertexToPixel Output = (VertexToPixel)0;
	float4x4 preViewProjection = mul (xView, xProjection);
	float4x4 preWorldViewProjection = mul (xWorld, preViewProjection);

	Output.Position = mul(inPos, preWorldViewProjection);
	Output.TextureCoords = inTexCoords;

	float3 Normal = normalize(mul(normalize(inNormal), xWorld));
	Output.LightingFactor = 1;
	if (xEnableLighting)
		Output.LightingFactor = dot(Normal, -xLightDirection);

	return Output;
}

PixelToFrame TexturedPS(VertexToPixel PSIn)
{
	PixelToFrame Output = (PixelToFrame)0;

	Output.Color = tex2D(TextureSampler, PSIn.TextureCoords);
	Output.Color.rgb *= saturate(PSIn.LightingFactor) + xAmbient;

	return Output;
}

technique Textured
{
	pass Pass0
	{
		VertexShader = compile vs_2_0 TexturedVS();
		PixelShader  = compile ps_2_0 TexturedPS();
	}
}