188 lines
4.4 KiB
C
188 lines
4.4 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include "types.h"
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/* Returns EOF on when reading end of file. */
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int
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read_line(FILE *f, char *buf, size_t n)
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{
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char c;
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size_t byte_count = 0;
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while ((c = fgetc(f)) != '\n') {
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if (c == EOF) {
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buf++;
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*buf = '\0';
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return EOF;
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}
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else if (byte_count == n) {
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break;
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}
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else {
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*buf = c;
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buf++;
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byte_count++;
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}
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}
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*buf = '\0';
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return 0;
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}
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vec3 *
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read_vertices(char *path, uint32_t *vertex_num_out)
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{
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FILE *in = fopen(path, "r");
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vec3 *vertex_out = malloc(sizeof(vec3));
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*vertex_num_out = 0;
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#define BUFSIZE 256
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char buf[BUFSIZE];
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int status;
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do {
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memset(buf, 0, BUFSIZE);
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status = read_line(in, buf, BUFSIZE);
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if (buf[0] == 'v' && buf[1] == ' ') {
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/* ugly imperative garbage, look away */
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vec3 v;
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#define VERTBUFSIZE 32
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char vertbuf[VERTBUFSIZE];
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size_t i, start = 2;
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for (i = start; buf[i] != ' '; i++) {
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vertbuf[i-start] = buf[i];
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}
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vertbuf[i] = '\0';
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v.x = atof(vertbuf);
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memset(vertbuf, 0, VERTBUFSIZE);
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i++;
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start = i;
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for (; buf[i] != ' '; i++) {
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vertbuf[i-start] = buf[i];
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}
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vertbuf[i] = '\0';
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v.y = atof(vertbuf);
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memset(vertbuf, 0, VERTBUFSIZE);
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i++;
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start = i;
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for (; buf[i] != '\0'; i++) {
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vertbuf[i-start] = buf[i];
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}
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vertbuf[i] = '\0';
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v.z = atof(vertbuf);
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/* put the new vertex into the array */
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*vertex_num_out += 1;
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vertex_out = realloc(vertex_out, sizeof(vec3) * (*vertex_num_out));
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vertex_out[*vertex_num_out - 1] = v;
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}
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} while(status != EOF);
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fclose(in);
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return vertex_out;
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}
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uint32_t *
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read_indices(char *path, uint32_t *index_num_out)
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{
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FILE *in = fopen(path, "r");
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uint32_t *index_out = malloc(sizeof(uint32_t));
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*index_num_out = 0;
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#define BUFSIZE 256
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char buf[BUFSIZE];
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int status;
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do {
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memset(buf, 0, BUFSIZE);
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status = read_line(in, buf, BUFSIZE);
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if (buf[0] == 'f' && buf[1] == ' ') {
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#define INDEXBUFSIZE 32
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char indexbuf[INDEXBUFSIZE] = {0};
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size_t i, start = 2;
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for (i = start; buf[i] != '/'; i++) {
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indexbuf[i-start] = buf[i];
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}
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indexbuf[i] = '\0';
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uint32_t a = atoi(indexbuf);
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for (; buf[i] != ' '; i++);
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i++;
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memset(indexbuf, 0, INDEXBUFSIZE);
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start = i;
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for (; buf[i] != '/'; i++) {
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indexbuf[i-start] = buf[i];
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}
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indexbuf[i] = '\0';
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uint32_t b = atoi(indexbuf);
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for (; buf[i] != ' '; i++);
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i++;
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memset(indexbuf, 0, INDEXBUFSIZE);
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start = i;
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for (; buf[i] != '/'; i++) {
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indexbuf[i-start] = buf[i];
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}
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indexbuf[i] = '\0';
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uint32_t c = atoi(indexbuf);
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/* put the new index into the array */
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*index_num_out += 3;
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index_out = realloc(index_out, sizeof(uint32_t) * (*index_num_out));
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index_out[*index_num_out - 3] = a-1;
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index_out[*index_num_out - 2] = b-1;
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index_out[*index_num_out - 1] = c-1;
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}
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} while(status != EOF);
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fclose(in);
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return index_out;
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}
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int
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main(int argc, char *argv[])
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{
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if (argc != 3) {
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fprintf(stderr, "usage: serialize in.obj out.mod");
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exit(1);
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}
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/* convert obj to mod */
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uint32_t vertices_num;
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uint32_t indices_num;
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vec3 *vertices = read_vertices(argv[1], &vertices_num);
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uint32_t *indices = read_indices(argv[1], &indices_num);
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/* serialize the data */
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FILE *f = fopen(argv[2], "w");
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fwrite(&vertices_num, 4, 1, f);
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for (size_t i = 0; i < vertices_num; i++) {
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fwrite(&vertices[i].x, 8, 1, f);
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fwrite(&vertices[i].y, 8, 1, f);
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fwrite(&vertices[i].z, 8, 1, f);
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}
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fwrite(&indices_num, 4, 1, f);
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for (size_t i = 0; i < indices_num; i++) {
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fwrite(&indices[i], 4, 1, f);
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}
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fclose(f);
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free(vertices);
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free(indices);
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}
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