// fragment shader that takes in a diffuse texture and some material parameters.

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

DECLARE_TEXTURE(diffuseTexture)

BEGIN_CBUFFER(cbMaterialDiffuse)
CONST_TYPE float4    diffuseColor;
CONST_TYPE float3    emissiveColor;
CONST_TYPE float3    specularColor;
CONST_TYPE float     specularPower;
END_CBUFFER(cbMaterialDiffuse)

SurfaceMaterial computeSurfaceMaterial(const FragmentParameters params)
{
	half4 diffuseTextureColor = (half4)tex2D(diffuseTexture, params.texcoord0.xy);

	SurfaceMaterial mout;
	mout.diffuseColor       = diffuseTextureColor.rgb * (half3)diffuseColor.rgb;
	mout.alpha              = diffuseTextureColor.a   * (half)diffuseColor.a;

	//float3 eyeToSurf = normalize(g_eyePosition-params.worldSpacePosition);

	//mout.emissiveColor      = 1-pow(saturate(dot(normalize(g_eyePosition-params.worldSpacePosition),2)), params.worldSpaceNormal);//emissiveColor * saturate(dot(-g_eyeDirection, params.worldSpaceNormal));
	mout.emissiveColor      = (half3)emissiveColor;

	mout.specularColor      = (half3)specularColor;
	mout.specularPower      = (half)specularPower;
	mout.tangentSpaceNormal = half3(0,0,1);

	return mout;
}