Re-refactor
Let's keep this speed-optimized, even though we want to achieve high readability.
This commit is contained in:
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a9bd5ae144
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a451979501
@ -34,131 +34,114 @@
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#include <string.h>
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static int32_t get_row_count(int32_t const **array);
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static int32_t get_face_count(FACES const faces);
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static int32_t get_edge_count(FACES const faces);
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static double **parse_2d_array(char const * const obj_string,
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char *item);
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static FACES parse_face_array(char const * const obj_string);
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static bool assemble_obj_arrays(char const * const obj_string,
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VERTICES *obj_v_out,
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FACES *obj_f_out,
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uint32_t *vc_out,
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uint32_t *fc_out,
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uint32_t *ec_out);
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static void assemble_HE_stage1(VERTICES obj_v,
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HE_vert *vertices,
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int32_t *vc);
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uint32_t *vc);
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static void assemble_HE_stage2(FACES obj_f,
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HE_vert *vertices,
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HE_face *faces,
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HE_edge *edges,
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int32_t *fc,
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int32_t *ec);
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uint32_t *fc,
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uint32_t *ec);
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static void assemble_HE_stage3(HE_edge *edges,
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int32_t *ec,
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int32_t *dec);
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uint32_t *ec,
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uint32_t *dec);
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/**
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* Get the row count of the 2d array.
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*
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* @param array the 2 dimensional array
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* @return the row count
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*/
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static int32_t get_row_count(int32_t const **array)
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{
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uint32_t rc = 0;
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if (!array)
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return -1;
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while (array[rc])
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rc++;
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return rc;
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}
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/**
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* Get the amount of faces as they are in the
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* .obj file.
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*
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* @param faces the faces array
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* @return the count of faces, -1 on failure
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*/
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static int32_t get_face_count(FACES const faces)
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{
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if (!faces)
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return 0;
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return get_row_count((int32_t const**)faces);
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}
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/**
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* Get the amount of edges.
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*
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* @param faces the faces array which will be used
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* to calculate the amount of edges
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* @return the count of edges, -1 on failure
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*/
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static int32_t get_edge_count(FACES const faces)
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{
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uint32_t ec = 0;
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uint32_t fc;
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if (!faces)
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return -1;
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fc = get_face_count(faces);
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for (uint32_t i = 0; i < fc; i++)
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ec += faces[i][0];
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return ec;
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}
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/**
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* Parse a string which supposedly is a 2-dimensional
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* array in the .obj file, describing all faces, all vertices
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* and such. The parsing depends on the item string, such as "f"
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* or "v".
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* Parse the obj_string for obj related arrays such as
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* "f 1 4 3 2" or "v 0.3 0.2 -1.2" and fill the related
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* raw obj_* structures which are not yet HE_* structures.
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* This function is a blob to take advantage of subsequent
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* strtok_r calls which allow us to parse the whole string only
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* once.
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*
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* @param obj_string the string that is in obj format
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* @param item the item to look for, such as "f" or "v"
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* @return a newly allocated 2-dimensional array, NULL on failure
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* @param obj_v_out where to save the vertices, the rear
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* dimension will always have 3 elements for x,y,z [out]
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* @param obj_f_out where to save the faces, the rear dimension
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* will be terminated with a "0" [out]
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*/
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static double **parse_2d_array(char const * const obj_string,
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char *item)
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static bool assemble_obj_arrays(char const * const obj_string,
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VERTICES *obj_v_out,
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FACES *obj_f_out,
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uint32_t *vc_out,
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uint32_t *fc_out,
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uint32_t *ec_out)
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{
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uint32_t lc = 0;
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uint32_t vc = 0,
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fc = 0,
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ec = 0;
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char *string,
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*str_ptr_space = NULL, /* for strtok */
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*str_ptr_newline = NULL, /* for strtok */
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*str_tmp_ptr = NULL; /* for strtok */
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double **arr = NULL;
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VERTICES obj_v = NULL;
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FACES obj_f = NULL;
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if (!obj_string || !item)
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return NULL;
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if (!obj_string || !obj_v_out || !obj_f_out)
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return false;
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/* avoid side effects */
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string = malloc(sizeof(char) * strlen(obj_string) + 1);
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strcpy(string, obj_string);
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/* start parsing the string line by line */
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str_tmp_ptr = strtok_r(string, "\n", &str_ptr_newline);
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while (str_tmp_ptr && *str_tmp_ptr) {
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/* parse word by word */
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str_tmp_ptr = strtok_r(str_tmp_ptr, " ", &str_ptr_space);
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if (!strcmp(str_tmp_ptr, item)) {
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/*
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* VERTICES
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*/
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if (!strcmp(str_tmp_ptr, "v")) {
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char *myint = NULL;
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uint8_t i = 1;
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uint8_t i = 0;
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REALLOC(arr, sizeof(double*) * (lc + 2));
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arr[lc] = NULL;
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REALLOC(obj_v, sizeof(*obj_v) * (vc + 2));
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obj_v[vc] = NULL;
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while ((myint = strtok_r(NULL, " ", &str_ptr_space))) {
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i++;
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REALLOC(arr[lc],
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sizeof(double**) * (i + 1));
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arr[lc][i - 1] = atof(myint);
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REALLOC(obj_v[vc],
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sizeof(**obj_v) * (i + 1));
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obj_v[vc][i - 1] = atof(myint);
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if (i > 3)
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ABORT("Malformed vertice exceeds 3 dimensions!\n");
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}
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arr[lc][0] = i - 1; /* save length at first position */
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lc++;
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arr[lc] = NULL; /* trailing NULL pointer */
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vc++;
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obj_v[vc] = NULL; /* trailing NULL pointer */
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/*
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* FACES
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*/
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} else if (!strcmp(str_tmp_ptr, "f")) {
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char *myint = NULL;
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uint8_t i = 0;
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REALLOC(obj_f, sizeof(*obj_f) * (fc + 2));
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obj_f[fc] = NULL;
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while ((myint = strtok_r(NULL, " ", &str_ptr_space))) {
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i++;
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ec++;
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REALLOC(obj_f[fc],
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sizeof(**obj_f) * (i + 1));
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obj_f[fc][i - 1] = atoi(myint);
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obj_f[fc][i] = 0; /* so we can iterate over it more easily */
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}
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fc++;
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obj_f[fc] = NULL; /* trailing NULL pointer */
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}
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str_tmp_ptr = strtok_r(NULL, "\n", &str_ptr_newline);
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@ -166,61 +149,13 @@ static double **parse_2d_array(char const * const obj_string,
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free(string);
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return arr;
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}
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*obj_v_out = obj_v;
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*obj_f_out = obj_f;
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*vc_out = vc;
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*fc_out = fc;
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*ec_out = ec;
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/**
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* Parses the face arrays. Since these contain slashes, such as
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* "f 1/4/3 8/4/4 9/8/3" we cannot use parse_2d_array() since
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* we need extra logic.
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*
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* @param obj_string the string that is in obj format
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* @return a newly allocated FACES array, NULL on failure
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*/
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static FACES parse_face_array(char const * const obj_string)
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{
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uint32_t lc = 0;
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char *string,
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*str_ptr_space = NULL, /* for strtok */
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*str_ptr_newline = NULL, /* for strtok */
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*str_tmp_ptr = NULL; /* for strtok */
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FACES arr = NULL;
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if (!obj_string)
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return NULL;
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string = malloc(sizeof(char) * strlen(obj_string) + 1);
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strcpy(string, obj_string);
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str_tmp_ptr = strtok_r(string, "\n", &str_ptr_newline);
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while (str_tmp_ptr && *str_tmp_ptr) {
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str_tmp_ptr = strtok_r(str_tmp_ptr, " ", &str_ptr_space);
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if (!strcmp(str_tmp_ptr, "f")) {
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char *myint = NULL;
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uint8_t i = 1;
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REALLOC(arr, sizeof(uint32_t*) * (lc + 2));
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arr[lc] = NULL;
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while ((myint = strtok_r(NULL, " ", &str_ptr_space))) {
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i++;
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REALLOC(arr[lc],
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sizeof(uint32_t**) * (i + 1));
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arr[lc][i - 1] = atoi(myint);
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}
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arr[lc][0] = i - 1; /* save length at first position */
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lc++;
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arr[lc] = NULL; /* trailing NULL pointer */
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}
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str_tmp_ptr = strtok_r(NULL, "\n", &str_ptr_newline);
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}
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free(string);
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return arr;
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return true;
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}
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/**
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@ -238,11 +173,11 @@ static FACES parse_face_array(char const * const obj_string)
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*/
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static void assemble_HE_stage1(VERTICES obj_v,
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HE_vert *vertices,
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int32_t *vc)
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uint32_t *vc)
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{
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uint8_t const xpos = 1;
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uint8_t const ypos = 2;
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uint8_t const zpos = 3;
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uint8_t const xpos = 0;
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uint8_t const ypos = 1;
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uint8_t const zpos = 2;
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int8_t const default_col = -1;
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*vc = 0;
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@ -250,10 +185,6 @@ static void assemble_HE_stage1(VERTICES obj_v,
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while (obj_v[*vc]) {
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vector *tmp_vec;
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if (obj_v[*vc][0] > 3)
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ABORT("Failure in parse_obj(),\n"
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"malformed vertice, exceeds 3 dimensions!\n");
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tmp_vec = malloc(sizeof(vector));
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CHECK_PTR_VAL(tmp_vec);
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@ -299,18 +230,17 @@ static void assemble_HE_stage2(FACES obj_f,
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HE_vert *vertices,
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HE_face *faces,
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HE_edge *edges,
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int32_t *fc,
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int32_t *ec)
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uint32_t *fc,
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uint32_t *ec)
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{
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*ec = 0;
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/* create HE_edges and real HE_faces */
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for (uint32_t i = 0; i < (uint32_t)(*fc); i++) { /* for all faces */
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uint32_t j = 0;
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/* for all vertices of the face */
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for (uint32_t j = 0; j < (uint32_t)obj_f[i][0]; j++) {
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uint32_t obj_f_pos = j + 1; /* first pos is reserved for length */
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while (obj_f[i][j]) {
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uint32_t fv_arr_id =
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obj_f[i][obj_f_pos] - 1; /* fv_id starts at 1 */
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obj_f[i][j] - 1; /* fv_id starts at 1 */
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edges[*ec].vert = &(vertices[fv_arr_id]);
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edges[*ec].face = &(faces[i]);
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@ -334,7 +264,7 @@ static void assemble_HE_stage2(FACES obj_f,
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edges[*ec].vert->edge_array[*eac] = &(edges[*ec - 1]);
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(*eac)++;
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if (obj_f_pos == (uint32_t)obj_f[i][0]) { /* no vertice left */
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if (!obj_f[i][j + 1]) { /* no vertice left */
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uint32_t *eac;
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/* connect last edge to first edge */
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edges[*ec].next = &(edges[*ec - j]);
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@ -350,6 +280,7 @@ static void assemble_HE_stage2(FACES obj_f,
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}
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(*ec)++;
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j++;
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}
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faces[i].edge = &(edges[*ec - 1]); /* "last" edge */
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@ -367,8 +298,8 @@ static void assemble_HE_stage2(FACES obj_f,
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* @param dec the dummy edges count
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*/
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static void assemble_HE_stage3(HE_edge *edges,
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int32_t *ec,
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int32_t *dec)
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uint32_t *ec,
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uint32_t *dec)
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{
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/* find pairs */
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for (uint32_t i = 0; i < (uint32_t)(*ec); i++) { /* for all edges */
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@ -435,11 +366,12 @@ static void assemble_HE_stage3(HE_edge *edges,
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*/
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HE_obj *parse_obj(char const * const obj_string)
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{
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int32_t vc = 0, /* vertices count */
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uint32_t vc = 0, /* vertices count */
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fc = 0, /* face count */
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ec = 0, /* edge count */
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dec = 0; /* dummy edge count */
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char *string = NULL;
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char *string = NULL,
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*str_ptr;
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HE_vert *vertices = NULL;
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HE_edge *edges = NULL;
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HE_face *faces = NULL;
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@ -453,18 +385,19 @@ HE_obj *parse_obj(char const * const obj_string)
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string = malloc(sizeof(char) * strlen(obj_string) + 1);
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strcpy(string, obj_string);
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str_ptr = string;
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obj_v = parse_2d_array(string, "v");
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/* obj_vt = parse_2d_array(obj_string, "vt"); */
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obj_f = parse_face_array(string);
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if (!assemble_obj_arrays(string, &obj_v, &obj_f, &vc, &fc, &ec))
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return NULL;
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if ((ec = get_edge_count(obj_f)) == -1)
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ABORT("Invalid edge count!\n");
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if ((fc = get_face_count(obj_f)) == -1)
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ABORT("Invalid face count!\n");
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/* if ((ec = get_edge_count(obj_f)) == -1) */
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/* ABORT("Invalid edge count!\n"); */
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/* if ((fc = get_face_count(obj_f)) == -1) */
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/* ABORT("Invalid face count!\n"); */
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vertices = malloc(sizeof(HE_vert) *
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get_row_count((int32_t const**)obj_v) + 1);
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(vc + 1));
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CHECK_PTR_VAL(vertices);
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faces = (HE_face*) malloc(sizeof(HE_face) * fc);
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CHECK_PTR_VAL(faces);
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