#include <math.h>#include <stdlib.h>#include <stdint.h>#include "patchwerk.h"#include "core.h" struct arith_n {    pw_cable *a;    pw_cable *b;    pw_cable *out;}; static void add_compute(pw_node *node){    int blksize;    int n;    struct arith_n *arith;     blksize = pw_node_blksize(node);     arith = (struct arith_n *)pw_node_get_data(node);     for (n = 0; n < blksize; n++) {        PWFLT a, b, out;         a = pw_cable_get(arith->a, n);        b = pw_cable_get(arith->b, n);        out = a + b;         pw_cable_set(arith->out, n, out);    }} static void mul_compute(pw_node *node){    int blksize;    int n;    struct arith_n *arith;     blksize = pw_node_blksize(node);     arith = (struct arith_n *)pw_node_get_data(node);     for (n = 0; n < blksize; n++) {        PWFLT a, b, out;         a = pw_cable_get(arith->a, n);        b = pw_cable_get(arith->b, n);        out = a * b;         pw_cable_set(arith->out, n, out);    }} static void destroy(pw_node *node){    pw_patch *patch;    int rc;    void *ud;    rc = pw_node_get_patch(node, &patch);    if (rc != PW_OK) return;    pw_node_cables_free(node);    ud = pw_node_get_data(node);    pw_memory_free(patch, &ud);} static int node_arith(sk_core *core, pw_function compute){    pw_patch *patch;    pw_node *node;    int rc;    sk_param a;    sk_param b;    void *ud;    struct arith_n *arith;     rc = sk_param_get(core, &b);    SK_ERROR_CHECK(rc);    rc = sk_param_get(core, &a);    SK_ERROR_CHECK(rc);     patch = sk_core_patch(core);     rc = pw_memory_alloc(patch, sizeof(struct arith_n), &ud);    SK_PW_ERROR_CHECK(rc);    arith = (struct arith_n *)ud;     rc = pw_patch_new_node(patch, &node);    SK_PW_ERROR_CHECK(rc);     rc = pw_node_cables_alloc(node, 3);    SK_PW_ERROR_CHECK(rc);     pw_node_set_block(node, 2);     pw_node_get_cable(node, 0, &arith->a);    pw_node_get_cable(node, 1, &arith->b);    pw_node_get_cable(node, 2, &arith->out);     pw_node_set_data(node, arith);    pw_node_set_compute(node, compute);    pw_node_set_destroy(node, destroy);     sk_param_set(core, node, &a, 0);    sk_param_set(core, node, &b, 1);    sk_param_out(core, node, 2);    return 0;} int sk_node_add(sk_core *core){    return node_arith(core, add_compute);} int sk_node_mul(sk_core *core){    return node_arith(core, mul_compute);} /* TODO: mul, sub, div */