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用可编程渲染管线实现phone光照模型

2008-05-04 23:09 363 查看 
Ambient Lighting = Ca*[Ga + sum(Atti*Spoti*Lai)]

Where:

ParameterDefault valueTypeDescription
Ca(0,0,0,0)D3DCOLORVALUEMaterial ambient color
Ga(0,0,0,0)D3DCOLORVALUEGlobal ambient color
Atteni(0,0,0,0)D3DCOLORVALUELight attenuation of the ith light. See Attenuation and Spotlight Factor (Direct3D 9).
Spoti(0,0,0,0)D3DVECTORSpotlight factor of the ith light. See Attenuation and Spotlight Factor (Direct3D 9).
sumN/AN/ASum of the ambient light
Lai(0,0,0,0)D3DVECTORLight ambient color of the ith light
Diffuse Lighting = sum[Cd*Ld*(N.Ldir)*Atten*Spot]

ParameterDefault valueTypeDescription
sumN/AN/ASummation of each light's diffuse component.
Cd(0,0,0,0)D3DCOLORVALUEDiffuse color.
Ld(0,0,0,0)D3DCOLORVALUELight diffuse color.
NN/AD3DVECTORVertex normal
LdirN/AD3DVECTORDirection vector from object vertex to the light.
AttenN/AFLOATLight attenuation. See Attenuation and Spotlight Factor (Direct3D 9).
SpotN/AFLOATSpotlight factor. See Attenuation and Spotlight Factor (Direct3D 9).
Specular Lighting = Cs * sum[Ls * (N • H)P * Atten * Spot]
The following table identifies the variables, their types, and their ranges.

ParameterDefault valueTypeDescription
Cs(0,0,0,0)D3DCOLORVALUESpecular color.
sumN/AN/ASummation of each light's specular component.
NN/AD3DVECTORVertex normal.
HN/AD3DVECTORHalf way vector. See the section on the halfway vector.
P0.0FLOATSpecular reflection power. Range is 0 to +infinity
Ls(0,0,0,0)D3DCOLORVALUELight specular color.
AttenN/AFLOATLight attenuation value. See Attenuation and Spotlight Factor (Direct3D 9).
SpotN/AFLOATSpotlight factor. See Attenuation and Spotlight Factor (Direct3D 9).
float4x4 matViewProjection;
float4 Light_Position;
float4 Light_Attenuation;
float4 Light_Color;
float4 Ambient_Color;
float4 vViewPosition;
float alpha;

struct VS_INPUT
{
float4 Position : POSITION0;
float3 Normal : NORMAL0;
float2 Texcoord : TEXCOORD0;
};

struct VS_OUTPUT
{
float4 Position : POSITION0;
float2 Texcoord : TEXCOORD0;
float4 Color : COLOR0;
};

float4 PointLighting(float3 position, float3 normal
, float3 eyedir, float4 ambient
, float3 lightpos, float3 lightatt, float4 lightcolor)
{
float3 lightdir = normalize(position - lightpos);
float3 dis = distance(position, lightpos);
float disatt = saturate(1 / ( lightatt.x + lightatt.y * dis + lightatt.z * dis * dis ));
float angleatt = saturate(-lightdir * normal);
float3 reflectdir = normalize(reflect(lightdir, normal));
float specularatt = pow(saturate(reflectdir * eyedir), alpha);

return ambient + lightcolor * disatt * (angleatt + specularatt);
}

VS_OUTPUT vs_main( VS_INPUT Input )
{
VS_OUTPUT Output;

Output.Position = mul( Input.Position, matViewProjection );
Output.Texcoord = Input.Texcoord;
float3 eyedir = normalize(vViewPosition - Input.Position);
Output.Color = PointLighting(Input.Position, Input.Normal
, eyedir, Ambient_Color
, Light_Position, Light_Attenuation, Light_Color);

return( Output );

}

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