208 lines
7 KiB
C
208 lines
7 KiB
C
#include "defines.h"
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static void push_face(Universe *uni, Object3D *obj, int a, int b, int c, uint8_t wire) {
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Face *f = &uni->faces[uni->num_faces++];
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f->a = a; f->b = b; f->c = c;
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f->force_wire = wire;
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obj->num_faces++;
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}
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static Object3D *alloc_object(Universe *uni) {
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Object3D *obj = &uni->objects[uni->num_objects++];
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obj->vert_start = uni->num_verts;
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obj->face_start = uni->num_faces;
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obj->num_verts = 0;
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obj->num_faces = 0;
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obj->pos.x = obj->pos.y = obj->pos.z = 0;
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obj->base_pos.x = obj->base_pos.y = obj->base_pos.z = 0;
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mat3_identity(&obj->rot);
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return obj;
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}
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Object3D *add_sphere(Universe *uni, fixed x, fixed y, fixed z, fixed r, int det, uint8_t col, uint8_t wire) {
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int i, j, v_base, phi, th;
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Object3D *obj;
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Vector3 *v, *n;
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if (uni->num_objects >= MAX_OBJECTS) return NULL;
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if (uni->num_verts + (det + 1) * det > MAX_VERTEX) return NULL;
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if (uni->num_faces + det * det * 2 > MAX_FACES) return NULL;
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obj = alloc_object(uni);
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obj->color = col;
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v_base = uni->num_verts;
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for (j = 0; j <= det; j++) {
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phi = (j * 180 / det) % 360;
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for (i = 0; i < det; i++) {
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th = (i * 360 / det) % 360;
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v = &uni->verts[uni->num_verts];
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n = &uni->v_normals[uni->num_verts];
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n->x = f_mul(sintab[phi], costab[th]);
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n->y = costab[phi];
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n->z = f_mul(sintab[phi], sintab[th]);
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v->x = x + f_mul(r, n->x);
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v->y = y + f_mul(r, n->y);
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v->z = z + f_mul(r, n->z);
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uni->num_verts++; obj->num_verts++;
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}
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}
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for (j = 0; j < det; j++) {
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for (i = 0; i < det; i++) {
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int a = v_base + j * det + i;
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int b = v_base + j * det + (i + 1) % det;
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int c = v_base + (j + 1) * det + i;
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int d = v_base + (j + 1) * det + (i + 1) % det;
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push_face(uni, obj, a, b, c, wire);
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push_face(uni, obj, b, d, c, wire);
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}
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}
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return obj;
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}
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Object3D *add_cylinder(Universe *uni, fixed x, fixed y, fixed z, fixed r, fixed h, int det, uint8_t col, uint8_t wire) {
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int i, v_base, cap_bot_center, cap_bot_rim, cap_top_center, cap_top_rim, th;
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fixed half_h, s, cs;
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Object3D *obj;
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if (uni->num_objects >= MAX_OBJECTS) return NULL;
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if (uni->num_verts + 2 + 4 * det > MAX_VERTEX) return NULL;
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if (uni->num_faces + 4 * det > MAX_FACES) return NULL;
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obj = alloc_object(uni);
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obj->color = col;
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v_base = uni->num_verts;
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half_h = h / 2;
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/* --- Corps --- */
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for (i = 0; i < det; i++) {
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th = (i * 360 / det) % 360;
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s = sintab[th]; cs = costab[th];
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uni->v_normals[uni->num_verts].x = cs;
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uni->v_normals[uni->num_verts].y = 0;
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uni->v_normals[uni->num_verts].z = s;
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uni->verts[uni->num_verts].x = x + f_mul(r, cs);
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uni->verts[uni->num_verts].y = y - half_h;
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uni->verts[uni->num_verts].z = z + f_mul(r, s);
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uni->num_verts++; obj->num_verts++;
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uni->v_normals[uni->num_verts].x = cs;
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uni->v_normals[uni->num_verts].y = 0;
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uni->v_normals[uni->num_verts].z = s;
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uni->verts[uni->num_verts].x = x + f_mul(r, cs);
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uni->verts[uni->num_verts].y = y + half_h;
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uni->verts[uni->num_verts].z = z + f_mul(r, s);
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uni->num_verts++; obj->num_verts++;
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}
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for (i = 0; i < det; i++) {
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int a = v_base + (i * 2);
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int b = v_base + ((i * 2 + 2) % (det * 2));
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int cv = a + 1;
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int d = b + 1;
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push_face(uni, obj, a, cv, b, wire);
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push_face(uni, obj, cv, d, b, wire);
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}
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/* --- Fond bas --- */
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cap_bot_center = uni->num_verts;
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uni->v_normals[uni->num_verts].x = 0;
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uni->v_normals[uni->num_verts].y = -int_to_f(1);
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uni->v_normals[uni->num_verts].z = 0;
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uni->verts[uni->num_verts].x = x;
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uni->verts[uni->num_verts].y = y - half_h;
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uni->verts[uni->num_verts].z = z;
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uni->num_verts++; obj->num_verts++;
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cap_bot_rim = uni->num_verts;
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for (i = 0; i < det; i++) {
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th = (i * 360 / det) % 360;
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s = sintab[th]; cs = costab[th];
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uni->v_normals[uni->num_verts].x = 0;
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uni->v_normals[uni->num_verts].y = -int_to_f(1);
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uni->v_normals[uni->num_verts].z = 0;
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uni->verts[uni->num_verts].x = x + f_mul(r, cs);
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uni->verts[uni->num_verts].y = y - half_h;
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uni->verts[uni->num_verts].z = z + f_mul(r, s);
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uni->num_verts++; obj->num_verts++;
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}
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for (i = 0; i < det; i++)
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push_face(uni, obj, cap_bot_center, cap_bot_rim + i, cap_bot_rim + (i + 1) % det, wire);
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/* --- Fond haut --- */
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cap_top_center = uni->num_verts;
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uni->v_normals[uni->num_verts].x = 0;
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uni->v_normals[uni->num_verts].y = int_to_f(1);
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uni->v_normals[uni->num_verts].z = 0;
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uni->verts[uni->num_verts].x = x;
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uni->verts[uni->num_verts].y = y + half_h;
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uni->verts[uni->num_verts].z = z;
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uni->num_verts++; obj->num_verts++;
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cap_top_rim = uni->num_verts;
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for (i = 0; i < det; i++) {
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th = (i * 360 / det) % 360;
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s = sintab[th]; cs = costab[th];
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uni->v_normals[uni->num_verts].x = 0;
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uni->v_normals[uni->num_verts].y = int_to_f(1);
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uni->v_normals[uni->num_verts].z = 0;
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uni->verts[uni->num_verts].x = x + f_mul(r, cs);
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uni->verts[uni->num_verts].y = y + half_h;
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uni->verts[uni->num_verts].z = z + f_mul(r, s);
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uni->num_verts++; obj->num_verts++;
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}
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for (i = 0; i < det; i++)
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push_face(uni, obj, cap_top_center, cap_top_rim + (i + 1) % det, cap_top_rim + i, wire);
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return obj;
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}
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/* --- I/O sur Mesh dynamique (non utilisé dans le pipeline principal) --- */
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void save_mesh(Mesh *m, const char *fn) {
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FILE *f = fopen(fn, "wb");
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if (!f) return;
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fwrite(&m->num_verts, sizeof(int), 1, f);
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fwrite(&m->num_faces, sizeof(int), 1, f);
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fwrite(m->verts, sizeof(Vector3), m->num_verts, f);
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fwrite(m->v_normals,sizeof(Vector3), m->num_verts, f);
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fwrite(m->faces, sizeof(Face), m->num_faces, f);
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fclose(f);
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}
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Mesh *load_mesh(const char *fname) {
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Mesh *m;
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FILE *f = fopen(fname, "rb");
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if (!f) return NULL;
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m = (Mesh*)malloc(sizeof(Mesh));
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if (!m) return NULL;
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fread(&m->num_verts, sizeof(int), 1, f);
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fread(&m->num_faces, sizeof(int), 1, f);
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m->verts = (Vector3*)malloc(sizeof(Vector3) * m->num_verts);
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m->v_normals = (Vector3*)malloc(sizeof(Vector3) * m->num_verts);
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m->faces = (Face*) malloc(sizeof(Face) * m->num_faces);
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if (!m->verts || !m->v_normals || !m->faces) {
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free(m->verts); free(m->v_normals); free(m->faces); free(m);
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fclose(f);
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return NULL;
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}
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fread(m->verts, sizeof(Vector3), m->num_verts, f);
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fread(m->v_normals, sizeof(Vector3), m->num_verts, f);
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fread(m->faces, sizeof(Face), m->num_faces, f);
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fclose(f);
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return m;
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}
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void free_mesh(Mesh *m) {
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if (!m) return;
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free(m->verts);
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free(m->v_normals);
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free(m->faces);
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free(m);
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}
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