//
// Created by 14727 on 2022/11/19.
//

#include "NurbsBasis.cuh"

__device__ void d_basisFunction1(float *N_Texture, const float *knots, float u, int degree, int d_knotsCnt) {
    int m = d_knotsCnt - 1;
    for (int p = 0; p <= degree; p++) {
        for (int i = 0; i + p <= m - 1; i++) {
            if (p == 0) {
                if ((u > knots[i] || d_floatEqual1(u, knots[i])) && (u < knots[i + 1])
                    ||
                    d_floatEqual1(u, knots[i + 1]) && d_floatEqual1(u, knots[m])) {
                    N_Texture[p * m + i] = 1.0;
                } else {
                    N_Texture[p * m + i] = 0.0;
                }
            } else {
                float Nip_1 = N_Texture[(p - 1) * m + i];
                float Ni1p_1 = N_Texture[(p - 1) * m + i + 1];
                float left = d_floatEqual1(knots[i + p], knots[i]) ? 0 : (u - knots[i]) * Nip_1 /
                                                                        (knots[i + p] - knots[i]);
                float right = d_floatEqual1(knots[i + p + 1], knots[i + 1]) ? 0 : (knots[i + p + 1] - u) * Ni1p_1 /
                                                                                 (knots[i + p + 1] - knots[i + 1]);
                N_Texture[p * m + i] = left + right;
            }
        }
    }
}

__device__ bool d_floatEqual1(float a, float b) {
    return abs(a - b) < 0.00001;
}

void NurbsBasis::myPrint11(int a, int b) {
        printf("In NurbsBasis %d!!!\n", a * b);
}