#include <phong_lighting.cg>
#include <fragment_entry.cg>

DECLARE_TEXTURE(diffuseTexture0)
DECLARE_TEXTURE(diffuseTexture1)

SurfaceMaterial computeSurfaceMaterial(const FragmentParameters params)
{
	half4 diffuseTextureColor0 = (half4)tex2D(diffuseTexture0, params.texcoord0.xy);
	half4 diffuseTextureColor1 = (half4)tex2D(diffuseTexture1, params.texcoord1.xy);
	
	// selects texture depending on world normal steepness of height map
	half4 diffuseTextureColor = half4(diffuseTextureColor0*0.75 + diffuseTextureColor1*0.25);
	
	SurfaceMaterial mout;
	mout.diffuseColor       = diffuseTextureColor.rgb;
	mout.alpha              = diffuseTextureColor.a;
	mout.emissiveColor      = 0;
	mout.specularColor      = half3(0.2,0.2,0.2); // TODO: make this a constant parameter set by the material.
	mout.specularPower      = 16;
	mout.tangentSpaceNormal = half3(0,0,1);
	return mout;
}