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#include "BulletCollision/CollisionShapes/btSphereShape.h"
#include "BulletDynamics/ConstraintSolver/btPoint2PointConstraint.h"
#include "camera.hpp"
#include "ecs.hpp"
#include "math-helpers.hpp"
#include "physics.hpp"
#include "pk.h"
#include "vendor-glm-include.hpp"
PkeCamera NullCamera {};
CompInstance NullCameraInstance{};
PkeCamera *ActiveCamera = &NullCamera;
struct pke_camera_master {
pk_membucket *bkt;
pk_bkt_arr_t<PkeCamera> bktc_cameras{};
} cam_mstr;
btSphereShape CameraShape{1.f};
PkeCamera &PkeCamera_Register_Inner(PkeCamera &cam, CompInstance &inst, const InstPos &instPos) {
btVector3 gravity(0.f, 0.f, 0.f);
inst.comp_instance_flags |= COMPONENT_INSTANCE_FLAG_DO_NOT_SERIALIZE;
cam.phys.instHandle = inst.instanceHandle;
inst.physicsLayer = PhysicsCollision{0};
inst.physicsMask = PhysicsCollision{0};
btVector3 localInertia(0, 0, 0);
CameraShape.calculateLocalInertia(instPos.mass, localInertia);
inst.bt.motionState = pk_new<btDefaultMotionState>(MemBkt_Bullet);
new (inst.bt.motionState) btDefaultMotionState(instPos.posRot);
inst.bt.rigidBody = pk_new<btRigidBody>(MemBkt_Bullet);
new (inst.bt.rigidBody) btRigidBody(instPos.mass, inst.bt.motionState, &CameraShape, localInertia);
inst.bt.rigidBody->setLinearVelocity(btVector3(0,0,0));
inst.bt.rigidBody->setAngularVelocity(btVector3(0,0,0));
inst.bt.rigidBody->getCollisionShape()->setLocalScaling(instPos.scale);
BtDynamicsWorld->addRigidBody(inst.bt.rigidBody);
inst.bt.rigidBody->setGravity(gravity);
inst.bt.rigidBody->getBroadphaseProxy()->m_collisionFilterGroup = static_cast<PhysicsCollision_T>(inst.physicsLayer);
inst.bt.rigidBody->getBroadphaseProxy()->m_collisionFilterMask = static_cast<PhysicsCollision_T>(inst.physicsMask);
inst.bt.rigidBody->setUserPointer(reinterpret_cast<void *>(&inst));
return cam;
}
PkeCamera &PkeCamera_Register(pk_uuid uuid, const InstPos &instPos) {
CameraHandle cameraHandle{pk_bkt_arr_new_handle(&cam_mstr.bktc_cameras)};
CompInstance *inst;
auto &cam = cam_mstr.bktc_cameras[cameraHandle];
new (&cam) PkeCamera{};
cam.uuid = uuid;
ECS_CreateEntity(&cam, nullptr);
cam.camHandle = cameraHandle;
inst = ECS_CreateInstance(&cam, pk_uuid_zed, nullptr, nullptr);
return PkeCamera_Register_Inner(cam, *inst, instPos);
}
PkeCamera *PkeCamera_Get(CameraHandle cameraHandle) {
assert(cameraHandle != CameraHandle_MAX);
return &cam_mstr.bktc_cameras[cameraHandle];
}
PkeCamera *PkeCamera_Get(EntityHandle handle) {
using CamFindFn = pk_tmpln_2<bool, const PkeCamera*, const PkeCamera*, const void*, const void*>;
CamFindFn cam_find_cb{};
cam_find_cb.func = [handle](const PkeCamera *user_obj_data, const PkeCamera *arr_obj_data) {
(void)user_obj_data;
return arr_obj_data->handle == handle;
};
pk_bkt_arr_handle cam_handle = pk_bkt_arr_find_first_handle(&cam_mstr.bktc_cameras, &CamFindFn::invoke, &cam_find_cb, NULL);
if (cam_handle == CameraHandle_MAX) {
return nullptr;
}
return &cam_mstr.bktc_cameras[cam_handle];
}
void PkeCamera_TargetInstance(CameraHandle cameraHandle, CompInstance *inst) {
assert(cameraHandle != CameraHandle_MAX);
auto &cam = cam_mstr.bktc_cameras[cameraHandle];
CompInstance *selfInstance = ECS_GetInstance(cam.phys.instHandle);
if (cam.phys.constraint != nullptr && cam.phys.constraint != CAFE_BABE(btTypedConstraint)) {
PkeCamera_UntargetInstance(cameraHandle);
}
btVector3 cameraOffset(0.f, -10.f, -10.f);
btTransform trfm;
btQuaternion bQuatRot;
inst->bt.motionState->getWorldTransform(trfm);
glm::vec3 gPos;
BulletToGlm(trfm.getOrigin(), gPos);
if (gPos != glm::vec3(0, 0, 0)) {
gPos = glm::normalize(-gPos);
}
glm::quat gQuatRot = glm::quatLookAt(-gPos, glm::vec3(0, -1, 0));
GlmToBullet(gQuatRot, bQuatRot);
trfm.setOrigin(trfm.getOrigin() + cameraOffset);
trfm.setRotation(bQuatRot);
cam.phys.target_inst_uuid = inst->uuid;
cam.phys.target_inst_handle = inst->instanceHandle;
selfInstance->bt.motionState->setWorldTransform(trfm);
selfInstance->bt.rigidBody->setWorldTransform(trfm);
selfInstance->bt.rigidBody->setLinearVelocity(btVector3(0,0,0));
selfInstance->bt.rigidBody->setAngularVelocity(btVector3(0,0,0));
selfInstance->bt.rigidBody->activate();
assert(cam.phys.constraint == nullptr || cam.phys.constraint == CAFE_BABE(btTypedConstraint));
/* 2025-01-14 JCB
* This was throwing bullet3 errors, so I've decided to split the work.
* This commit completes the 'targeting' task, where a camera tracks a target.
* This may or may not make a good starting point for the 'following' task.
*
cam.phys.constraint = pk_new<btTypedConstraint>(MemBkt_Bullet);
new (cam.phys.constraint) btPoint2PointConstraint(*selfInstance->bt.rigidBody, *inst->bt.rigidBody, btVector3(0.f, -1.f, -1.f), cameraOffset);
BtDynamicsWorld->addConstraint(cam.phys.constraint);
*/
cam.view = PKE_CAMERA_VIEW_TARGET;
cam.stale = PKE_CAMERA_STALE_POSROT;
}
void PkeCamera_UntargetInstance(CameraHandle cameraHandle) {
assert(cameraHandle != CameraHandle_MAX);
auto &cam = cam_mstr.bktc_cameras[cameraHandle];
BtDynamicsWorld->removeConstraint(cam.phys.constraint);
pk_delete<btTypedConstraint>(cam.phys.constraint, MemBkt_Bullet);
cam.phys.constraint = CAFE_BABE(btTypedConstraint);
cam.stale = PKE_CAMERA_STALE_POSROT;
}
void PkeCamera_SetPrimary(CameraHandle cameraHandle) {
bool b;
pk_iter_t<PkeCamera> iter_cam{};
assert(cameraHandle != CameraHandle_MAX);
b = pk_bkt_arr_iter_begin(&cam_mstr.bktc_cameras, &iter_cam);
while (b == true) {
// TODO 2025-05-28 JCB
// There was some speculative scene filtering happening here.
// I removed it because it was comparing entity parents and I don't
// think that is accurate.
// Instead, should be a per-viewport or per-world check?
iter_cam->isPrimary = iter_cam->camHandle == cameraHandle;
b = pk_bkt_arr_iter_increment(&cam_mstr.bktc_cameras, &iter_cam);
}
}
pk_bkt_arr &PkeCamera_GetPkBktArr() {
return cam_mstr.bktc_cameras;
}
void PkeCamera_Init() {
cam_mstr.bkt = pk_mem_bucket_create("pk_bkt_arr cam", 1024 * 1024, PK_MEMBUCKET_FLAG_NONE);
new (&cam_mstr.bktc_cameras) pk_bkt_arr_t<PkeCamera>{ pk_bkt_arr_handle_MAX_constexpr, cam_mstr.bkt, cam_mstr.bkt };
NullCamera.type = PKE_CAMERA_TYPE_ORTHOGONAL;
NullCamera.view = PKE_CAMERA_VIEW_TARGET;
NullCamera.stale = PKE_CAMERA_STALE_ALL;
InstPos instPos{
.posRot = {},
.scale = btVector3(1.f, 1.f, 1.f),
.mass = 1.f,
};
PkeCamera_Register_Inner(NullCamera, NullCameraInstance, instPos);
}
void PkeCamera_Teardown() {
BtDynamicsWorld->removeRigidBody(NullCameraInstance.bt.rigidBody);
pk_delete<btDefaultMotionState>(NullCameraInstance.bt.motionState, MemBkt_Bullet);
pk_delete<btRigidBody>(NullCameraInstance.bt.rigidBody, MemBkt_Bullet);
NullCameraInstance.bt.motionState = CAFE_BABE(btDefaultMotionState);
NullCameraInstance.bt.rigidBody = CAFE_BABE(btRigidBody);
pk_bkt_arr_teardown(&cam_mstr.bktc_cameras);
pk_mem_bucket_destroy(cam_mstr.bkt);
}
void PkeCamera_Tick(double delta) {
/* 2024-01-16 - JCB - This seems excessive to loop through every camera and do this.
* I think this could be simplified, but it might be premature optimization.
* Why we're looping all:
* - To avoid any weird scenarios where the active camera is changed and
* 1 frame the camera is in the wrong position.
* - To prevent various 'saves' that save camera positions from saving bad positional data
* It might be possible to handle these two scenarios explicitly, or it
* could be that removing pos and rot from the camera would make this unnecessary?
* See the camera serializer for more.
*/
(void)delta;
CompInstance *inst;
pk_iter_t<PkeCamera> iter_cam{};
bool b;
b = pk_bkt_arr_iter_begin(&cam_mstr.bktc_cameras, &iter_cam);
while (b == true) {
inst = ECS_GetInstance(iter_cam->phys.instHandle);
if (iter_cam->isMarkedForRemoval == true) {
if (ActiveCamera == iter_cam.data) {
ActiveCamera = &NullCamera;
}
if (iter_cam->phys.constraint != nullptr && iter_cam->phys.constraint != CAFE_BABE(btTypedConstraint)) {
// reminder: this is not currently handled by ECS
BtDynamicsWorld->removeConstraint(iter_cam->phys.constraint);
pk_delete<btTypedConstraint>(iter_cam->phys.constraint, MemBkt_Bullet);
}
if (inst != nullptr) {
if (inst->bt.rigidBody != nullptr) {
BtDynamicsWorld->removeRigidBody(inst->bt.rigidBody);
pk_delete<btRigidBody>(inst->bt.rigidBody, MemBkt_Bullet);
}
if (inst->bt.motionState != nullptr) {
pk_delete<btDefaultMotionState>(inst->bt.motionState, MemBkt_Bullet);
}
}
pk_bkt_arr_free_handle(&cam_mstr.bktc_cameras, iter_cam->camHandle);
new (iter_cam.data) PkeCamera{};
b = pk_bkt_arr_iter_increment(&cam_mstr.bktc_cameras, &iter_cam);
continue;
}
assert(inst != nullptr);
if (inst->isNeedingUpdated == true) {
iter_cam->stale = iter_cam->stale | PKE_CAMERA_STALE_POSROT;
inst->isNeedingUpdated = false;
}
if (iter_cam->phys.target_inst_uuid == pk_uuid_zed) {
b = pk_bkt_arr_iter_increment(&cam_mstr.bktc_cameras, &iter_cam);
continue;
}
iter_cam->stale = iter_cam->stale | PKE_CAMERA_STALE_POSROT;
b = pk_bkt_arr_iter_increment(&cam_mstr.bktc_cameras, &iter_cam);
};
}
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