SIMD编程语言

float4 pixelfunction(
    output_vs IN, 
    uniform sampler2D texture : TEX0, 
    uniform sampler2D normals : TEX1, 
    uniform float3 light, 
    uniform float3 eye ) : COLOR
{
    float4 color    = tex2D( texture, IN.uv );
    float4 normal   = tex2D( normals, IN.uv ) * 2 - 1;

    float3 T = normalize(IN.T);
    float3 B = normalize(IN.B);

    float3 N = 
        normal.b * normalize(IN.normal) +
        normal.r * T +
        normal.g * B;

    float3 V = normalize(eye - IN.pos.xyz);
    float3 L = normalize(light - IN.pos);
    float3 H = normalize(L + V);

    float4 diffuse  = color * saturate( dot(N, L) );
    float4 specular = color * pow(saturate(dot(N, H)), 15);
    float falloff   = dot(L, normalize(light));

    return pow(falloff, 5) * (diffuse + specular);
}

在这种语言中,真正必备的东西是:

• 矢量运算(点、交叉、归一化、饱和、反射等)
• 支持自定义数据类型(结构)
• 动态分支会很好(对于循环,if语句)