void BLI_endian_switch_float_array(float *val, const int size)
{
if (size > 0) {
int i = size;
val = val + (size - 1);
while (i--) {
BLI_endian_switch_float(val--);
}
}
}
static bool meshcache_read_mdd_range_from_time(FILE *fp,
const int verts_tot,
const float time, const float UNUSED(fps),
float *r_frame,
const char **err_str)
{
MDDHead mdd_head;
int i;
float f_time, f_time_prev = FLT_MAX;
float frame;
if (meshcache_read_mdd_head(fp, verts_tot, &mdd_head, err_str) == false) {
return false;
}
for (i = 0; i < mdd_head.frame_tot; i++) {
fread(&f_time, sizeof(float), 1, fp);
#ifdef __LITTLE_ENDIAN__
BLI_endian_switch_float(&f_time);
#endif
if (f_time >= time) {
break;
}
f_time_prev = f_time;
}
if (i == mdd_head.frame_tot) {
frame = (float)(mdd_head.frame_tot - 1);
}
if (UNLIKELY(f_time_prev == FLT_MAX)) {
frame = 0.0f;
}
else {
const float range = f_time - f_time_prev;
if (range <= FRAME_SNAP_EPS) {
frame = (float)i;
}
else {
frame = (float)(i - 1) + ((time - f_time_prev) / range);
}
}
*r_frame = frame;
return true;
}
bool MOD_meshcache_read_mdd_index(FILE *fp,
float (*vertexCos)[3], const int verts_tot,
const int index, const float factor,
const char **err_str)
{
MDDHead mdd_head;
if (meshcache_read_mdd_head(fp, verts_tot, &mdd_head, err_str) == false) {
return false;
}
if (fseek(fp, mdd_head.frame_tot * sizeof(int), SEEK_CUR) != 0) {
*err_str = "Header seek failed";
return false;
}
if (fseek(fp, index * mdd_head.verts_tot * sizeof(float) * 3, SEEK_CUR) != 0) {
*err_str = "Failed to seek frame";
return false;
}
if (factor >= 1.0f) {
#if 1
float *vco = *vertexCos;
unsigned int i;
for (i = mdd_head.verts_tot; i != 0 ; i--, vco += 3) {
fread(vco, sizeof(float) * 3, 1, fp);
# ifdef __LITTLE_ENDIAN__
BLI_endian_switch_float(vco + 0);
BLI_endian_switch_float(vco + 1);
BLI_endian_switch_float(vco + 2);
# endif /* __LITTLE_ENDIAN__ */
}
#else
/* no blending */
if (!fread(vertexCos, sizeof(float) * 3, mdd_head.verts_tot, f)) {
*err_str = errno ? strerror(errno) : "Failed to read frame";
return false;
}
# ifdef __LITTLE_ENDIAN__
BLI_endian_switch_float_array(vertexCos[0], mdd_head.verts_tot * 3);
# endif
#endif
}
else {
const float ifactor = 1.0f - factor;
float *vco = *vertexCos;
unsigned int i;
for (i = mdd_head.verts_tot; i != 0 ; i--, vco += 3) {
float tvec[3];
fread(tvec, sizeof(float) * 3, 1, fp);
#ifdef __LITTLE_ENDIAN__
BLI_endian_switch_float(tvec + 0);
BLI_endian_switch_float(tvec + 1);
BLI_endian_switch_float(tvec + 2);
#endif
vco[0] = (vco[0] * ifactor) + (tvec[0] * factor);
vco[1] = (vco[1] * ifactor) + (tvec[1] * factor);
vco[2] = (vco[2] * ifactor) + (tvec[2] * factor);
}
}
return true;
}