用Shader实现标准光照模型

float4x4matViewProjection;

float3GlobalAmbient;

float3LightColor;

float3LightPosition;

float4EyePosition;

float3Ke;

float3Ka;

float3Kd;

float3Ks;

floatShininess;

voidvs_main(

infloat4InPosition:POSITION,

infloat3InNormal:NORMAL,

outfloat4OutPosition:POSITION,

outfloat4OutColor:COLOR0

)

{

OutPosition=mul(InPosition,matViewProjection);

float3P=InPosition.xyz;

float3N=InNormal;

//Computetheemissiveterm

float3Emissive=Ke;

//Computetheambientterm

float3Ambient=Ka*GlobalAmbient;

//Computethediffuseterm

float3L=normalize(LightPosition-P);

floatDiffuseLight=max(dot(N,L),0);

float3Diffuse=Kd*LightColor*DiffuseLight;

//Computethespecularterm

float3V=normalize(EyePosition-P);

float3H=normalize(L+V);

floatSpecularLight=pow(max(dot(N,H),0),Shininess);

if(DiffuseLight<=0)SpecularLight=0;

float3Specular=Ks*LightColor*SpecularLight;

OutColor.xyz=Emissive+Ambient+Diffuse+Specular;

OutColor.w=1;

}

float4ps_main(float4OutColor:COLOR0):COLOR0

{

return(OutColor);

}