Rewritten from scratch. Welocme nissy 2.0!

1 files changed, 200 insertions, 0 deletions

diff --git a/old/2021-05-26-before-restyle/transformations.c b/old/2021-05-26-before-restyle/transformations.c
new file mode 100644
index 0000000..c457f0c
--- /dev/null
+++ b/old/2021-05-26-before-restyle/transformations.c
@@ -0,0 +1,200 @@
+#include "transformations.h"
+
+int edge_slice(int e); /* Return slice (e=0, s=1, m=2) to which e belongs */
+Cube rotate_via_compose(Transformation r, Cube c, PieceFilter f);
+bool read_rtables_file();
+bool write_rtables_file();
+
+/* Values mod 3 to determine from which side to take the state to convert */
+int epose_source[NTRANS];  /* 0 = epose, 1 = eposs, 2 = eposm */
+int eposs_source[NTRANS];
+int eposm_source[NTRANS];
+int eofb_source[NTRANS];   /* 0 = eoud,  1 = eorl,  2 = eofb  */
+int eorl_source[NTRANS];
+int eoud_source[NTRANS];
+int coud_source[NTRANS];   /* 0 = coud,  1 = corl,  2 = cofb  */
+int cofb_source[NTRANS];
+int corl_source[NTRANS];
+
+/* Transition tables for rotations (n+1 is mirror) */
+uint16_t epose_rtable[NTRANS][factorial12/factorial8];
+uint16_t eposs_rtable[NTRANS][factorial12/factorial8];
+uint16_t eposm_rtable[NTRANS][factorial12/factorial8];
+uint16_t eo_rtable[NTRANS][pow2to11];
+uint16_t cp_rtable[NTRANS][factorial8];
+uint16_t co_rtable[NTRANS][pow3to7];
+uint16_t cpos_rtable[NTRANS][factorial6];
+
+/* Same for moves */
+uint16_t moves_rtable[NTRANS][NMOVES];
+
+NissMove rotation_niss[NTRANS][6];
+
+int edge_slice(int e) {
+  if (e == FR || e == FL || e == BL || e == BR)
+    return 0;
+  if (e == UR || e == UL || e == DR || e == DL)
+    return 1;
+  return 2;
+}
+
+Cube rotate_via_compose(Transformation r, Cube c, PieceFilter f) {
+  if (r != mirror) {
+    return apply_alg_filtered(rotation_niss[r], c, f);
+  } else {
+    static int zero12[12]     = {0,0,0,0,0,0,0,0,0,0,0,0},
+               zero8[12]      = {0,0,0,0,0,0,0,0},
+               mirror_ep[12]  = {UF,UR,UB,UL,DF,DR,DB,DL,FL,FR,BR,BL},
+               mirror_cp[8]   = {UFL, UFR, UBR, UBL, DFL, DFR, DBR, DBL},
+               mirror_cpos[6] =
+                 {U_center,D_center,L_center,R_center,F_center,B_center};
+    return move_via_arrays((CubeArray){
+      .ep   = mirror_ep, .eofb = zero12, .eorl = zero12, .eoud = zero12,
+      .cp   = mirror_cp, .coud = zero8,  .corl = zero8,  .cofb = zero8,
+      .cpos = mirror_cpos}, c, f);
+  }
+}
+
+bool read_rtables_file() {
+  FILE *ttf;
+  long unsigned int me[12] = { factorial12/factorial8, factorial12/factorial8,
+                   factorial12/factorial8, pow2to11, pow2to11, pow2to11,
+                   factorial8, pow3to7, pow3to7, pow3to7, factorial6, NMOVES };
+  if ((ttf = fopen("rtables", "rb")) != NULL) {
+    bool r = true;
+    for (int m = 0; m < NTRANS; m++) {
+      r = r && fread(epose_rtable[m], sizeof(uint16_t), me[0],  ttf) == me[0];
+      r = r && fread(eposs_rtable[m], sizeof(uint16_t), me[1],  ttf) == me[1];
+      r = r && fread(eposm_rtable[m], sizeof(uint16_t), me[2],  ttf) == me[2];
+      r = r && fread(eo_rtable[m],    sizeof(uint16_t), me[3],  ttf) == me[3];
+      r = r && fread(cp_rtable[m],    sizeof(uint16_t), me[6],  ttf) == me[6];
+      r = r && fread(co_rtable[m],    sizeof(uint16_t), me[7],  ttf) == me[7];
+      r = r && fread(cpos_rtable[m],  sizeof(uint16_t), me[10], ttf) == me[10];
+      r = r && fread(moves_rtable[m], sizeof(uint16_t), me[11], ttf) == me[11];
+    }
+    fclose(ttf);
+    return r;
+  } else return false;
+}
+
+bool write_rtables_file() {
+  FILE *ttf;
+  long unsigned int me[12] = { factorial12/factorial8, factorial12/factorial8,
+                   factorial12/factorial8, pow2to11, pow2to11, pow2to11,
+                   factorial8, pow3to7, pow3to7, pow3to7, factorial6, NMOVES };
+  if ((ttf = fopen("rtables", "wb")) != NULL) {
+    bool r = true;
+    for (int m = 0; m < NTRANS; m++) {
+      r = r && fwrite(epose_rtable[m], sizeof(uint16_t), me[0], ttf) == me[0];
+      r = r && fwrite(eposs_rtable[m], sizeof(uint16_t), me[1], ttf) == me[1];
+      r = r && fwrite(eposm_rtable[m], sizeof(uint16_t), me[2], ttf) == me[2];
+      r = r && fwrite(eo_rtable[m],    sizeof(uint16_t), me[3], ttf) == me[3];
+      r = r && fwrite(cp_rtable[m],    sizeof(uint16_t), me[6], ttf) == me[6];
+      r = r && fwrite(co_rtable[m],    sizeof(uint16_t), me[7], ttf) == me[7];
+      r = r && fwrite(cpos_rtable[m],  sizeof(uint16_t), me[10],ttf) == me[10];
+      r = r && fwrite(moves_rtable[m], sizeof(uint16_t), me[11],ttf) == me[11];
+    }
+    fclose(ttf);
+    return r;
+  } else return false;
+}
+
+void init_transformations(bool read, bool write) {
+  /* Compute sources */
+  for (int i = 0; i < NTRANS; i++) {
+    Cube cube = {0};
+    if (i != mirror)
+      cube = apply_alg(rotation_algs[i], (Cube){0});
+    epose_source[i] = edge_slice(edge_at(cube, FR));
+    eposs_source[i] = edge_slice(edge_at(cube, UR));
+    eposm_source[i] = edge_slice(edge_at(cube, UF));
+    eofb_source[i]  = center_at(cube, F_center)/2;
+    eorl_source[i]  = center_at(cube, R_center)/2;
+    eoud_source[i]  = center_at(cube, U_center)/2;
+    coud_source[i]  = center_at(cube, U_center)/2;
+    cofb_source[i]  = center_at(cube, F_center)/2;
+    corl_source[i]  = center_at(cube, R_center)/2;
+  }
+
+  /*TODO: maybe move down*/
+  /* Compute rotation_niss array, necessary for rotate_via_compose */
+  for (int r = 0; r != mirror; r++) {
+    concat(rotation_algs[r], rotation_algs[r], rotation_niss[r]);
+    for (int i = len(rotation_algs[r]); rotation_niss[r][i].m != NULLMOVE; i++)
+      rotation_niss[r][i].inverse = true;
+  }
+
+  /* If I can read tables from file, I stop here */
+  if (read)
+    if (read_rtables_file())
+      return;
+  
+  /* Initialize tables */
+  for (int m = 0; m < NTRANS; m++) {
+    int eparr[12] = {0,0,0,0,0,0,0,0,0,0,0,0}, cparr[8] = {0,0,0,0,0,0,0,0};
+    CubeArray epcp = { .ep = eparr, .cp = cparr };
+    cube_to_arrays(apply_alg(rotation_algs[m], (Cube){0}), &epcp,
+                  (PieceFilter){.epose=true,.eposs=true,.eposm=true,.cp=true});
+    for (uint16_t i = 0; i < factorial12/factorial8; i++) {
+      Cube c[3] = { admissible_ep((Cube){ .epose = i}, pf_e),
+                    admissible_ep((Cube){ .eposs = i}, pf_s),
+                    admissible_ep((Cube){ .eposm = i}, pf_m) };
+      epose_rtable[m][i]=rotate_via_compose(m,c[epose_source[m]],pf_ep).epose;
+      eposs_rtable[m][i]=rotate_via_compose(m,c[eposs_source[m]],pf_ep).eposs;
+      eposm_rtable[m][i]=rotate_via_compose(m,c[eposm_source[m]],pf_ep).eposm;
+    }
+    for (uint16_t i = 0; i < pow2to11; i++ ) {
+      int eoarr[12];
+      int_to_sum_zero_array(i, 2, 12, eoarr);
+      apply_permutation(eparr, eoarr, 12);
+      eo_rtable[m][i] = digit_array_to_int(eoarr, 11, 2);
+    }
+    for (uint16_t i = 0; i < pow3to7; i++) {
+      int coarr[12];
+      int_to_sum_zero_array(i, 3, 8, coarr);
+      apply_permutation(cparr, coarr, 8);
+      co_rtable[m][i] = digit_array_to_int(coarr, 7, 3);
+    }
+    for (uint16_t i = 0; i < factorial8; i++)
+      cp_rtable[m][i] = rotate_via_compose(m, (Cube){.cp=i}, pf_cp).cp;
+    for (uint16_t i = 0; i < factorial6; i++)
+      cpos_rtable[m][i] = rotate_via_compose(m, (Cube){.cpos=i}, pf_cpos).cpos;
+    for (Move i = 0; i < NMOVES; i++) {
+      Cube aux = transform_cube(m, move_cube(i, (Cube){0}));
+      for (Move move = 0; move < NMOVES; move++)
+        if (is_solved(move_cube(inverse[move], aux)))
+          moves_rtable[m][i] = move;
+    }
+  }
+
+  if (write)
+    if (!write_rtables_file())
+      printf("Error in writing rtables: file not writable\n");
+}
+
+Cube transform_cube(Transformation t, Cube cube) {
+  Cube transformed = {0};
+
+  uint16_t aux_epos[3] = { cube.epose, cube.eposs, cube.eposm },
+           aux_eo[3]   = { cube.eoud,  cube.eorl,  cube.eofb  },
+           aux_co[3]   = { cube.coud,  cube.corl,  cube.cofb  };
+
+  transformed.epose = epose_rtable[t][aux_epos[epose_source[t]]];
+  transformed.eposs = eposs_rtable[t][aux_epos[eposs_source[t]]];
+  transformed.eposm = eposm_rtable[t][aux_epos[eposm_source[t]]];
+  transformed.eofb  = eo_rtable[t][aux_eo[eofb_source[t]]];
+  transformed.eorl  = eo_rtable[t][aux_eo[eorl_source[t]]];
+  transformed.eoud  = eo_rtable[t][aux_eo[eoud_source[t]]];
+  transformed.coud  = co_rtable[t][aux_co[coud_source[t]]];
+  transformed.corl  = co_rtable[t][aux_co[corl_source[t]]];
+  transformed.cofb  = co_rtable[t][aux_co[cofb_source[t]]];
+  transformed.cp    = cp_rtable[t][cube.cp];
+  transformed.cpos  = cpos_rtable[t][cube.cpos];
+
+  return transformed;
+}
+
+void transform_alg(Transformation t, NissMove *alg) {
+  for (int i = 0; alg[i].m; i++)
+    alg[i].m = moves_rtable[t][alg[i].m];
+}