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#include "mesh.h"
#define LINE_SIZE 1024
#define darray_push(darray, value) \
do { \
(darray) = darray_hold((darray), 1, sizeof(*(darray))); \
(darray)[darray_size(darray) - 1] = (value); \
} while (0)
#define DARRAY_RAW_DATA(darray) ((int*)(darray) - 2)
#define DARRAY_CAPACITY(darray) (DARRAY_RAW_DATA(darray)[0])
#define DARRAY_OCCUPIED(darray) (DARRAY_RAW_DATA(darray)[1])
int darray_size(void *darray) {
return darray != NULL ? DARRAY_OCCUPIED(darray) : 0;
}
void darray_free(void *darray) {
if (darray != NULL) {
free(DARRAY_RAW_DATA(darray));
}
}
#define UNUSED_VAR(x) ((void)(x))
void *darray_hold(void *darray, int count, int itemsize) {
assert(count > 0 && itemsize > 0);
if (darray == NULL) {
int raw_size = sizeof(int) * 2 + itemsize * count;
int *base = (int*)malloc(raw_size);
base[0] = count; /* capacity */
base[1] = count; /* occupied */
return base + 2;
}
else if (DARRAY_OCCUPIED(darray) + count <= DARRAY_CAPACITY(darray)) {
DARRAY_OCCUPIED(darray) += count;
return darray;
}
else {
int needed_size = DARRAY_OCCUPIED(darray) + count;
int double_curr = DARRAY_CAPACITY(darray) * 2;
int capacity = needed_size > double_curr ? needed_size : double_curr;
int occupied = needed_size;
int raw_size = sizeof(int) * 2 + itemsize * capacity;
int *base = (int*)realloc(DARRAY_RAW_DATA(darray), raw_size);
base[0] = capacity;
base[1] = occupied;
return base + 2;
}
}
Vec3 vec3_min(Vec3 a, Vec3 b) {
float x = min(a.x, b.x);
float y = min(a.y, b.y);
float z = min(a.z, b.z);
Vec3 r = { x, y, z };
return r;
}
Vec3 vec3_max(Vec3 a, Vec3 b) {
float x = max(a.x, b.x);
float y = max(a.y, b.y);
float z = max(a.z, b.z);
Vec3 r = { x, y, z };
return r;
}
static Mesh *build_mesh(
Vec3 *positions, Vec2 *texcoords, Vec3 *normals,
Vec4 *tangents, Vec4 *joints, Vec4 *weights,
int *position_indices, int *texcoord_indices, int *normal_indices) {
Vec3 bbox_min = { +1e6, +1e6, +1e6 };
Vec3 bbox_max = { -1e6, -1e6, -1e6 };
int num_indices = darray_size(position_indices);
int num_faces = num_indices / 3;
Mesh *mesh;
int i;
assert(num_faces > 0 && num_faces * 3 == num_indices);
assert(darray_size(position_indices) == num_indices);
assert(darray_size(texcoord_indices) == num_indices);
assert(darray_size(normal_indices) == num_indices);
mesh = (Mesh*)malloc(sizeof(Mesh));
mesh->triangles = ssrM_newvector(int, 3 * num_faces);
int nvert = DARRAY_OCCUPIED(positions);
Vert* vertices = ssrM_newvector(Vert, nvert);
for (i = 0; i < num_indices; i++) {
int position_index = position_indices[i];
int texcoord_index = texcoord_indices[i];
int normal_index = normal_indices[i];
assert(position_index >= 0 && position_index < darray_size(positions));
assert(texcoord_index >= 0 && texcoord_index < darray_size(texcoords));
assert(normal_index >= 0 && normal_index < darray_size(normals));
vertices[position_index].index = position_index;
vertices[position_index].position = positions[position_index];
vertices[position_index].texcoord = texcoords[texcoord_index];
vertices[position_index].normal = normals[normal_index];
if (tangents) {
int tangent_index = position_index;
ssr_assert(tangent_index >= 0 && tangent_index < darray_size(tangents));
vertices[position_index].tangent = tangents[tangent_index];
}
mesh->triangles[i] = position_index;
//bbox_min = vec3_min(bbox_min, vertices[i].position);
//bbox_max = vec3_max(bbox_max, vertices[i].position);
}
mesh->tris_count = num_faces;
mesh->verts_count = nvert;
mesh->vertices = vertices;
//mesh->center = vec3_div(vec3_add(bbox_min, bbox_max), 2);
return mesh;
}
Mesh* mesh_loadfromobj(const char *filename) {
Vec3 *positions = NULL;
Vec2 *texcoords = NULL;
Vec3 *normals = NULL;
Vec4 *tangents = NULL;
Vec4 *joints = NULL;
Vec4 *weights = NULL;
int *position_indices = NULL;
int *texcoord_indices = NULL;
int *normal_indices = NULL;
char line[LINE_SIZE];
Mesh *mesh;
FILE *file;
file = fopen(filename, "rb");
assert(file != NULL);
while (1) {
int items;
if (fgets(line, LINE_SIZE, file) == NULL) {
break;
}
else if (strncmp(line, "v ", 2) == 0) { /* position */
Vec3 position;
items = sscanf(line, "v %f %f %f",
&position.x, &position.y, &position.z);
assert(items == 3);
darray_push(positions, position);
}
else if (strncmp(line, "vt ", 3) == 0) { /* texcoord */
Vec2 texcoord;
items = sscanf(line, "vt %f %f",
&texcoord.x, &texcoord.y);
assert(items == 2);
darray_push(texcoords, texcoord);
}
else if (strncmp(line, "vn ", 3) == 0) { /* normal */
Vec3 normal;
items = sscanf(line, "vn %f %f %f",
&normal.x, &normal.y, &normal.z);
assert(items == 3);
darray_push(normals, normal);
}
else if (strncmp(line, "f ", 2) == 0) { /* face */
int i;
int pos_indices[3], uv_indices[3], n_indices[3];
items = sscanf(line, "f %d/%d/%d %d/%d/%d %d/%d/%d",
&pos_indices[0], &uv_indices[0], &n_indices[0],
&pos_indices[1], &uv_indices[1], &n_indices[1],
&pos_indices[2], &uv_indices[2], &n_indices[2]);
assert(items == 9);
for (i = 0; i < 3; i++) {
darray_push(position_indices, pos_indices[i] - 1);
darray_push(texcoord_indices, uv_indices[i] - 1);
darray_push(normal_indices, n_indices[i] - 1);
}
} else if (strncmp(line, "# ext.tangent ", 14) == 0) { /* tangent */
Vec4 tangent;
items = sscanf(line, "# ext.tangent %f %f %f %f",
&tangent.x, &tangent.y, &tangent.z, &tangent.w);
assert(items == 4);
darray_push(tangents, tangent);
}
}
fclose(file);
mesh = build_mesh(positions, texcoords, normals, tangents, joints, weights,
position_indices, texcoord_indices, normal_indices);
darray_free(positions);
darray_free(texcoords);
darray_free(normals);
darray_free(tangents);
darray_free(joints);
darray_free(weights);
darray_free(position_indices);
darray_free(texcoord_indices);
darray_free(normal_indices);
printf("%s: %d verts, %d tris\n", filename, mesh->verts_count, mesh->tris_count);
return mesh;
}
//
//
//Mesh* mesh_loadfromobj(const char* path) {
//}
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