Soft shading using SSE2 SIMD technology purely in assembly language !!

 

 note: my 3D rendering software engine  in real time (Fast3D/2D) powered with SSE4

 // function returns the mixing of 2 3d vectors = (1-u)*a+u*b
 // function returns the mixing of 3 3d vector = (1-u-v)*a+u*b+v*c
// this application is useful for the smooth shading of the triangle

inline vec mix(float u,vec a,vec b) {
__asm {
            mov        eax, 03F800000h // 1.0f
            movd      xmm0,eax
            movss     xmm1,u
            subss      xmm0,xmm1 /// 1-u
            shufps     xmm0,xmm0,_MM_SHUFFLE(3, 0, 0, 0) // xmm0 =0,1-u,1-u,1-u
            shufps     xmm1,xmm1,_MM_SHUFFLE(3, 0, 0, 0) // xmm1 =0,u,u,u
            movaps   xmm2,a
            movaps   xmm3,b
            mulps      xmm0,xmm2 /// xmm0 = (1-u)*a
            mulps      xmm1,xmm3 /// xmm1 = u*b
            addps      xmm0,xmm1 // (1-u)*a+u*b
       }
}

// supports only SSE4.2
inline vec mix2(float u,float v,vec a,vec b,vec c)   {
......
}