void trexskl_vsAmbGEN(float4 position	: POSITION,
	float3 normal : NORMAL,
	out float4 oPos: POSITION,
	uniform float4x4 wvpMat
)
{
	oPos = mul(wvpMat, position);
}

float4 trexskl_fpAmbGEN(float4 position	: POSITION,
	uniform float3 ambient,
	uniform float4 matAmb,
	uniform float4 matEmissive): COLOR0
{
	float4 retColor = max(matEmissive, float4(ambient, 1) * matAmb);
	return retColor;
}

void trexskl_vsLightGEN(float4 position	: POSITION,
	float3 normal : NORMAL,
	out float4 oPos : POSITION,
	out float3 oNorm : TEXCOORD0,
	out float3 oSpDir : TEXCOORD1,
	out float4 oWp : TEXCOORD2,
	uniform float4x4 wMat,
	uniform float4x4 witMat,
	uniform float4x4 wvpMat,
	uniform float4 spotlightDir)
{
	oWp = mul(wMat, position);
	oPos = mul(wvpMat, position);
	oNorm = normalize(mul((float3x3)witMat, normal));
	oSpDir = mul(wMat, spotlightDir).xyz;
}

float4 trexskl_fpLightGEN(float4 position	: POSITION,
	float3 norm : TEXCOORD0,
	float3 spDir : TEXCOORD1,
	float4 wp : TEXCOORD2,
	uniform float3 lightDif0,
	uniform float4 lightPos0,
	uniform float4 lightAtt0,
	uniform float3 lightSpec0,
	uniform float4 matDif,
	uniform float4 matSpec,
	uniform float matShininess,
	uniform float3 camPos,
	uniform float4 invSMSize,
	uniform float4 spotlightParams): COLOR0
{
	float3 ld0 = normalize(lightPos0.xyz - (lightPos0.w * wp.xyz));
	// attenuation
	half lightDist = length(lightPos0.xyz - wp.xyz) / lightAtt0.r;
	half la = 1;
	if(lightAtt0.a > 0.0)
	{
		half ila = lightDist * lightDist; // quadratic falloff
		la = 1.0 / (lightAtt0.g + lightAtt0.b * lightDist + lightAtt0.a * ila);
	}
	float3 normal = normalize(norm);
	float3 diffuse = max(dot(ld0, normal), 0);
	// calculate the spotlight effect
	float spot = (spotlightParams.x == 1 && spotlightParams.y == 0 && spotlightParams.z == 0 && spotlightParams.w == 1 ? 1 : // if so, then it's not a spot light
	   saturate((dot(ld0, normalize(-spDir)) - spotlightParams.y) / (spotlightParams.x - spotlightParams.y)));
	float3 camDir = normalize(camPos - wp.xyz);
	float3 halfVec = normalize(ld0 + camDir);
	float3 specular = pow(max(dot(normal, halfVec), 0), matShininess);
	float3 diffuseContrib = diffuse * lightDif0 * matDif.rgb;
	float3 specularContrib = specular * lightSpec0 * matSpec.rgb;
	float3 light0C = (diffuseContrib + specularContrib) * la * spot;
	float alpha = matDif.a;
	return float4(light0C, alpha);
}