10_添加环境光

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float4 NormalVector = float4(Normal, 1.0f);
float3 Intermediate0, Intermediate1, Intermediate2;

Intermediate0.x = dot(View.SkyIrradianceEnvironmentMap[0], NormalVector);
Intermediate0.y = dot(View.SkyIrradianceEnvironmentMap[1], NormalVector);
Intermediate0.z = dot(View.SkyIrradianceEnvironmentMap[2], NormalVector);

float4 vB = NormalVector.xyzz * NormalVector.yzzx;
Intermediate1.x = dot(View.SkyIrradianceEnvironmentMap[3], vB);
Intermediate1.y = dot(View.SkyIrradianceEnvironmentMap[4], vB);
Intermediate1.z = dot(View.SkyIrradianceEnvironmentMap[5], vB);

float vC = NormalVector.x * NormalVector.x - NormalVector.y * NormalVector.y;
Intermediate2 = View.SkyIrradianceEnvironmentMap[6].xyz * vC;

return max(0, Intermediate0 + Intermediate1 + Intermediate2);