quakeforge/libs/scene/transform.c

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/*
transform.c
General transform handling
Copyright (C) 2021 Bill Currke
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#define IMPLEMENT_TRANSFORM_Funcs
#include "QF/scene/hierarchy.h"
#include "QF/scene/scene.h"
#include "QF/scene/transform.h"
#include "scn_internal.h"
transform_t *
__transform_alloc (scene_t *scene)
{
scene_resources_t *res = scene->resources;
transform_t *transform = PR_RESNEW_NC (res->transforms);
transform->scene = scene;
transform->id = PR_RESINDEX (res->transforms, transform);
transform->hierarchy = 0;
transform->index = 0;
return transform;
}
transform_t *
Transform_New (scene_t *scene, transform_t *parent)
{
transform_t *transform = __transform_alloc (scene);
if (parent) {
transform->hierarchy = parent->hierarchy;
transform->index = Hierarchy_InsertHierarchy (parent->hierarchy, 0,
parent->index, 0);
} else {
transform->hierarchy = Hierarchy_New (scene, 1);
transform->index = 0;
}
transform->hierarchy->transform.a[transform->index] = transform;
Hierarchy_UpdateMatrices (transform->hierarchy);
return transform;
}
void
Transform_Delete (transform_t *transform)
{
if (transform->index != 0) {
// The transform is not the root, so pull it out of its current
// hierarchy so deleting it is easier
Transform_SetParent (transform, 0);
}
// Takes care of freeing the transforms
Hierarchy_Delete (transform->hierarchy);
}
transform_t *
Transform_NewNamed (scene_t *scene, transform_t *parent, const char *name)
{
transform_t *transform = Transform_New (scene, parent);
Transform_SetName (transform, name);
return transform;
}
void
Transform_SetParent (transform_t *transform, transform_t *parent)
{
if (parent) {
hierarchy_t *hierarchy = transform->hierarchy;
uint32_t index = transform->index;
Hierarchy_InsertHierarchy (parent->hierarchy, hierarchy,
parent->index, index);
Hierarchy_RemoveHierarchy (hierarchy, index);
if (!hierarchy->name.size) {
Hierarchy_Delete (hierarchy);
}
} else {
// null parent -> make transform root
if (!transform->index) {
// already root
return;
}
hierarchy_t *hierarchy = transform->hierarchy;
uint32_t index = transform->index;
hierarchy_t *new_hierarchy = Hierarchy_New (transform->scene, 0);
Hierarchy_InsertHierarchy (new_hierarchy, hierarchy, null_transform,
index);
Hierarchy_RemoveHierarchy (hierarchy, index);
}
}
void
Transform_SetName (transform_t *transform, const char *name)
{
hierarchy_t *h = transform->hierarchy;
//FIXME create a string pool (similar to qfcc's, or even move that to util)
if (h->name.a[transform->index]) {
free (h->name.a[transform->index]);
}
h->name.a[transform->index] = strdup (name);
}
void
Transform_SetTag (transform_t *transform, uint32_t tag)
{
hierarchy_t *h = transform->hierarchy;
h->tag.a[transform->index] = tag;
}
void
Transform_SetLocalPosition (transform_t *transform, vec4f_t position)
{
hierarchy_t *h = transform->hierarchy;
h->localMatrix.a[transform->index][3] = position;
h->modified.a[transform->index] = 1;
Hierarchy_UpdateMatrices (h);
}
void
Transform_SetLocalRotation (transform_t *transform, vec4f_t rotation)
{
hierarchy_t *h = transform->hierarchy;
vec4f_t scale = h->localScale.a[transform->index];
mat4f_t mat;
mat4fquat (mat, rotation);
h->localRotation.a[transform->index] = rotation;
h->localMatrix.a[transform->index][0] = mat[0] * scale[0];
h->localMatrix.a[transform->index][1] = mat[1] * scale[1];
h->localMatrix.a[transform->index][2] = mat[2] * scale[2];
h->modified.a[transform->index] = 1;
Hierarchy_UpdateMatrices (h);
}
void
Transform_SetLocalScale (transform_t *transform, vec4f_t scale)
{
hierarchy_t *h = transform->hierarchy;
vec4f_t rotation = h->localRotation.a[transform->index];
mat4f_t mat;
mat4fquat (mat, rotation);
h->localScale.a[transform->index] = scale;
h->localMatrix.a[transform->index][0] = mat[0] * scale[0];
h->localMatrix.a[transform->index][1] = mat[1] * scale[1];
h->localMatrix.a[transform->index][2] = mat[2] * scale[2];
h->modified.a[transform->index] = 1;
Hierarchy_UpdateMatrices (h);
}
void
Transform_SetWorldPosition (transform_t *transform, vec4f_t position)
{
if (transform->index) {
hierarchy_t *h = transform->hierarchy;
uint32_t parent = h->parentIndex.a[transform->index];
position = mvmulf (h->worldInverse.a[parent], position);
}
Transform_SetLocalPosition (transform, position);
}
void
Transform_SetWorldRotation (transform_t *transform, vec4f_t rotation)
{
if (transform->index) {
hierarchy_t *h = transform->hierarchy;
uint32_t parent = h->parentIndex.a[transform->index];
rotation = qmulf (qconjf (h->worldRotation.a[parent]), rotation);
}
Transform_SetLocalRotation (transform, rotation);
}
void
Transform_SetLocalTransform (transform_t *transform, vec4f_t scale,
vec4f_t rotation, vec4f_t position)
{
hierarchy_t *h = transform->hierarchy;
mat4f_t mat;
mat4fquat (mat, rotation);
position[3] = 1;
h->localRotation.a[transform->index] = rotation;
h->localScale.a[transform->index] = scale;
h->localMatrix.a[transform->index][0] = mat[0] * scale[0];
h->localMatrix.a[transform->index][1] = mat[1] * scale[1];
h->localMatrix.a[transform->index][2] = mat[2] * scale[2];
h->localMatrix.a[transform->index][3] = position;
h->modified.a[transform->index] = 1;
Hierarchy_UpdateMatrices (h);
}