From 74352320b05a82b87fe0b7b91d8b075b582bc62c Mon Sep 17 00:00:00 2001
From: Joseph Walton-Rivers <joseph@walton-rivers.uk>
Date: Sat, 30 Apr 2022 19:45:22 +0100
Subject: [PATCH] add player input and camera tracking to rollball example
---
demo/demo/rollball.cpp | 76 +++++++++++++++++++---
demo/include/rollball.hpp | 3 +
fggl/phys/bullet/simulation.cpp | 99 ++++++++++++++++++++++++++---
include/fggl/ecs3/prototype/world.h | 14 +++-
include/fggl/phys/bullet/bullet.hpp | 5 +-
include/fggl/phys/bullet/types.hpp | 5 ++
include/fggl/phys/callbacks.hpp | 50 +++++++++++++++
include/fggl/phys/types.hpp | 7 ++
8 files changed, 238 insertions(+), 21 deletions(-)
create mode 100644 include/fggl/phys/callbacks.hpp
diff --git a/demo/demo/rollball.cpp b/demo/demo/rollball.cpp
index 24b50bf..4f81014 100644
--- a/demo/demo/rollball.cpp
+++ b/demo/demo/rollball.cpp
@@ -93,6 +93,7 @@ static void setupPrefabs(fggl::ecs3::World& world, Prefabs& prefabs) {
// player (cube because my sphere function doesn't exist yet
prefabs.player = world.create(true);
world.add<fggl::math::Transform>(prefabs.player);
+ world.add<fggl::phys::Dynamics>(prefabs.player);
world.add<fggl::phys::RigidBody>(prefabs.player);
fggl::data::StaticMesh meshComponent;
@@ -110,6 +111,8 @@ static void setupPrefabs(fggl::ecs3::World& world, Prefabs& prefabs) {
meshComponent.pipeline = "phong";
fggl::data::make_cube(meshComponent.mesh);
world.set<fggl::data::StaticMesh>(prefabs.collectable, &meshComponent);
+
+ auto* callbacks = world.add<fggl::phys::CollisionCallbacks>(prefabs.collectable);
}
}
@@ -136,7 +139,7 @@ static void setupCamera(fggl::ecs3::World& world) {
}
}
-static void setupEnvironment(fggl::ecs3::World& world, const Prefabs prefabs, fggl::math::vec2& size) {
+static fggl::ecs3::entity_t setupEnvironment(fggl::ecs3::World& world, const Prefabs prefabs, fggl::math::vec2& size) {
{
auto northWall = world.copy(prefabs.wallX);
auto* transform = world.get<fggl::math::Transform>(northWall);
@@ -167,17 +170,18 @@ static void setupEnvironment(fggl::ecs3::World& world, const Prefabs prefabs, fg
transform->origin({0.0f, -2.5f, 0.0f});
}
+ auto player = fggl::ecs3::NULL_ENTITY;
{
// player just starts off as the prefab dictates
- auto player = world.copy(prefabs.player);
+ player = world.copy(prefabs.player);
}
{
// collectables
std::array<fggl::math::vec3, 3> collectPos {{
- {-5.0f, 0.0f, 12.0f},
- {15.0f, 0.0f, 0.5f},
- {6.0f, 0.0f, -15.0f}
+ {-5.0f, -0.5f, 12.0f},
+ {15.0f, -0.5f, 0.5f},
+ {6.0f, -0.5f, -15.0f}
}};
// build the collectables
@@ -187,6 +191,8 @@ static void setupEnvironment(fggl::ecs3::World& world, const Prefabs prefabs, fg
transform->origin(pos);
}
}
+
+ return player;
}
enum camera_type { cam_free, cam_arcball };
@@ -209,9 +215,9 @@ static void process_camera(fggl::ecs3::World& ecs, const fggl::input::Input& inp
motion -= (forward * delta);
camTransform->origin( camTransform->origin() + motion );
- if ( cam_mode == cam_arcball || input.mouse.down( fggl::input::MouseButton::MIDDLE ) ) {
+ if ( input.mouse.down( fggl::input::MouseButton::MIDDLE ) ) {
fggl::input::process_arcball(ecs, input, cam);
- } else if ( cam_mode == cam_free ) {
+ } else {
fggl::input::process_freecam(ecs, input, cam);
}
fggl::input::process_edgescroll( ecs, input, cam );
@@ -233,12 +239,64 @@ namespace demo {
// create a 20x20 grid
fggl::math::vec2 size{40.0f, 40.0f};
- setupEnvironment(world(), prefabs, size);
+ player = setupEnvironment(world(), prefabs, size);
}
void RollBall::update() {
Game::update();
- process_camera(world(), input());
+ auto& input = this->input();
+
+ if ( input.keyboard.down(glfwGetKeyScancode(GLFW_KEY_F1))) {
+ process_camera(world(), input);
+ } else {
+ if ( player != fggl::ecs3::NULL_ENTITY ) {
+ auto &world = this->world();
+
+ const fggl::math::vec3 forward = fggl::math::FORWARD;
+ const fggl::math::vec3 right = fggl::math::RIGHT;
+ fggl::math::vec3 force = fggl::math::VEC3_ZERO;
+ bool moved = false;
+
+ if (input.keyboard.down(glfwGetKeyScancode(GLFW_KEY_W))) {
+ force += forward;
+ moved = true;
+ }
+
+ if (input.keyboard.down(glfwGetKeyScancode(GLFW_KEY_S))) {
+ force -= forward;
+ moved = true;
+ }
+
+ if (input.keyboard.down(glfwGetKeyScancode(GLFW_KEY_A))) {
+ force -= right;
+ moved = true;
+ }
+
+ if (input.keyboard.down(glfwGetKeyScancode(GLFW_KEY_D))) {
+ force += right;
+ moved = true;
+ }
+
+ // setup dynamic force
+ if ( moved ) {
+ float forceFactor = 3.0F;
+ force = glm::normalize(force) * forceFactor;
+ auto *dynamics = world.get<fggl::phys::Dynamics>(player);
+ dynamics->force += force;
+ }
+
+ {
+ auto cameras = world.findMatching<fggl::gfx::Camera>();
+ fggl::ecs3::entity_t cam = cameras[0];
+ auto *camComp = world.get<fggl::gfx::Camera>(cam);
+ camComp->target = world.get<fggl::math::Transform>(player)->origin();
+
+ auto *camTransform = world.get<fggl::math::Transform>(cam);
+ camTransform->origin( camComp->target - (fggl::math::FORWARD * 15.0F) + (fggl::math::UP * 15.0F) );
+ }
+
+ }
+ }
}
void RollBall::render(fggl::gfx::Graphics &gfx) {
diff --git a/demo/include/rollball.hpp b/demo/include/rollball.hpp
index 755c9fb..73821df 100644
--- a/demo/include/rollball.hpp
+++ b/demo/include/rollball.hpp
@@ -38,6 +38,9 @@ namespace demo {
void update() override;
void render(fggl::gfx::Graphics& gfx) override;
+
+ private:
+ fggl::ecs3::entity_t player = fggl::ecs3::NULL_ENTITY;
};
}
diff --git a/fggl/phys/bullet/simulation.cpp b/fggl/phys/bullet/simulation.cpp
index 381ac73..9e028e0 100644
--- a/fggl/phys/bullet/simulation.cpp
+++ b/fggl/phys/bullet/simulation.cpp
@@ -37,8 +37,24 @@ namespace fggl::phys::bullet {
void BulletPhysicsEngine::step() {
checkForPhys();
+
+ auto dynamicEnts = m_ecs->findMatching<phys::Dynamics>();
+ for (auto& ent : dynamicEnts) {
+ auto* dynamicComp = m_ecs->get<phys::Dynamics>(ent);
+ auto* bulletProxy = m_ecs->get<phys::bullet::BulletBody>(ent);
+ if ( bulletProxy == nullptr ) {
+ std::cerr << "entity has dynamics but isn't a physics object!" << std::endl;
+ continue;
+ }
+
+ const auto forceVec = dynamicComp->force;
+ bulletProxy->body->applyCentralForce( {forceVec.x, forceVec.y, forceVec.z} );
+ dynamicComp->force = math::VEC3_ZERO;
+ }
+
m_world->stepSimulation(60.0f);
syncToECS();
+ dealWithCollisions();
}
static void build_motation_state(math::Transform* myState, BulletBody* btState) {
@@ -107,19 +123,21 @@ namespace fggl::phys::bullet {
colShape,
localInt
);
- btComp->body = new btRigidBody(bodyCI);
+ auto* body = new btRigidBody(bodyCI);
+ body->setUserIndex(static_cast<int>(ent));
+
+ btComp->body = body;
if (!fgBody->isStatic()) {
- // FIXME this is for testing, needs to be removed
- btComp->body->setRestitution(0.5f);
- btComp->body->setRollingFriction(0.0f);
+ body->setRestitution(0.5f);
+ body->setRollingFriction(0.0f);
}
- m_world->addRigidBody(btComp->body);
- if ( !fgBody->isStatic() ) {
- btComp->body->applyTorque({50.0f, 0.5f, 0.5f});
- btComp->body->applyImpulse({5.0f, 0.5f, 0.5f}, {0.0f, 0.0f, 0.0f});
+ if ( fgBody->type == BodyType::KINEMATIC ) {
+ body->setCollisionFlags( body->getCollisionFlags() | btCollisionObject::CF_KINEMATIC_OBJECT );
}
+
+ m_world->addRigidBody(btComp->body );
}
}
@@ -165,4 +183,69 @@ namespace fggl::phys::bullet {
delete m_config.collisionConfiguration;
}
+ static void handleCollisionCallbacks(ecs3::World* world, ecs3::entity_t owner, ecs3::entity_t other) {
+ auto* callbacks = world->tryGet<CollisionCallbacks>(owner);
+ if ( callbacks == nullptr ) {
+ return;
+ }
+
+ auto* cache = world->tryGet<CollisionCache>(owner);
+ if ( cache != nullptr ) {
+ auto itr = cache->collisions.find(other);
+ if ( itr == cache->collisions.end() ) {
+ if ( callbacks->onEnter != nullptr ) {
+ callbacks->onEnter(other);
+ }
+ cache->collisions.insert( other );
+ } else {
+ if ( callbacks->onStay != nullptr ) {
+ callbacks->onStay(other);
+ }
+ }
+ }
+ }
+
+ void BulletPhysicsEngine::dealWithCollisions() {
+ // flush collision caches
+ auto caches = m_ecs->findMatching<CollisionCache>();
+ for( auto& ent : caches) {
+ auto* cache = m_ecs->get<CollisionCache>(ent);
+ std::swap(cache->collisions, cache->lastFrame);
+ cache->collisions.clear();
+ }
+
+ // deal with the number of manifolds
+ const auto numManifolds = m_config.dispatcher->getNumManifolds();
+ for ( int i=0; i< numManifolds; ++i) {
+ auto* contactManifold = m_config.dispatcher->getManifoldByIndexInternal(i);
+
+ const auto* body0 = contactManifold->getBody0();
+ const auto* body1 = contactManifold->getBody1();
+
+ handleCollisionCallbacks(m_ecs, body0->getUserIndex(), body1->getUserIndex());
+ handleCollisionCallbacks(m_ecs, body1->getUserIndex(), body0->getUserIndex());
+
+ std::cerr << "contact: " << body0->getUserIndex() << " on " << body1->getUserIndex() << std::endl;
+ }
+
+ // note conacts that have ended
+ for( auto& ent : caches) {
+ auto* cache = m_ecs->get<CollisionCache>(ent);
+
+ // if we don't have an exit callback, it's pointless checking the cache
+ auto* callbacks = m_ecs->tryGet<CollisionCallbacks>(ent);
+ if ( callbacks == nullptr || callbacks->onExit == nullptr){
+ continue;
+ }
+
+ // check if a collision has ended
+ for (const auto& other : cache->lastFrame) {
+ auto itr = cache->collisions.find(other);
+ if (itr == cache->collisions.end()) {
+ callbacks->onExit(other);
+ }
+ }
+ }
+ }
+
} // namespace fggl::phys::bullet
\ No newline at end of file
diff --git a/include/fggl/ecs3/prototype/world.h b/include/fggl/ecs3/prototype/world.h
index 75969c3..7b63348 100644
--- a/include/fggl/ecs3/prototype/world.h
+++ b/include/fggl/ecs3/prototype/world.h
@@ -205,13 +205,12 @@ namespace fggl::ecs3::prototype {
}
template<typename C>
- C *get(entity_t entity_id) const {
+ C* tryGet(entity_t entity_id) const {
try {
- auto &entity = m_entities.at(entity_id);
+ const auto &entity = m_entities.at(entity_id);
try {
return entity.get<C>();
} catch ( std::out_of_range& e ) {
- std::cerr << "entity " << entity_id << " does not have component "<< C::name << std::endl;
return nullptr;
}
} catch ( std::out_of_range& e) {
@@ -220,6 +219,15 @@ namespace fggl::ecs3::prototype {
}
}
+ template<typename C>
+ C *get(entity_t entity_id) const {
+ C* ptr = tryGet<C>(entity_id);
+ if (ptr == nullptr) {
+ std::cerr << "entity " << entity_id << " does not have component "<< C::name << std::endl;
+ }
+ return ptr;
+ }
+
template<typename C>
void remove(entity_t entity_id) {
try {
diff --git a/include/fggl/phys/bullet/bullet.hpp b/include/fggl/phys/bullet/bullet.hpp
index d377796..b50326c 100644
--- a/include/fggl/phys/bullet/bullet.hpp
+++ b/include/fggl/phys/bullet/bullet.hpp
@@ -48,8 +48,11 @@ namespace fggl::phys::bullet {
return "phys::Bullet3";
}
- void onLoad(ecs3::ModuleManager &manager, ecs3::TypeRegistry &types) override {
+ void onLoad(ecs3::ModuleManager & /*manager*/, ecs3::TypeRegistry &types) override {
// dependencies
+ types.make<phys::CollisionCallbacks>();
+ types.make<phys::CollisionCache>();
+
types.make<phys::RigidBody>();
types.make<phys::Dynamics>();
diff --git a/include/fggl/phys/bullet/types.hpp b/include/fggl/phys/bullet/types.hpp
index 31d9a94..f06b858 100644
--- a/include/fggl/phys/bullet/types.hpp
+++ b/include/fggl/phys/bullet/types.hpp
@@ -75,6 +75,11 @@ namespace fggl::phys::bullet {
* Sync the bullet world state back to the ECS.
*/
void syncToECS();
+
+ /**
+ * Deal with physics collisions
+ */
+ void dealWithCollisions();
};
} // namespace fggl::phys::bullet
diff --git a/include/fggl/phys/callbacks.hpp b/include/fggl/phys/callbacks.hpp
new file mode 100644
index 0000000..cc14483
--- /dev/null
+++ b/include/fggl/phys/callbacks.hpp
@@ -0,0 +1,50 @@
+/*
+ * ${license.title}
+ * Copyright (C) 2022 ${license.owner}
+ * ${license.mailto}
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+//
+// Created by webpigeon on 30/04/22.
+//
+
+#ifndef FGGL_PHYS_CALLBACKS_HPP
+#define FGGL_PHYS_CALLBACKS_HPP
+
+#include <functional>
+#include <unordered_set>
+
+namespace fggl::phys {
+
+ using CollisionCB = std::function<void(ecs3::entity_t)>;
+
+ struct CollisionCallbacks {
+ constexpr static const char* name = "phys::Callbacks";
+ CollisionCB onEnter = nullptr;
+ CollisionCB onExit = nullptr;
+ CollisionCB onStay = nullptr;
+ };
+
+ struct CollisionCache {
+ constexpr static const char* name = "phys::Cache";
+ std::unordered_set<ecs3::entity_t> collisions;
+ std::unordered_set<ecs3::entity_t> lastFrame;
+ };
+
+} // namespace fggl::phys
+
+#endif //FGGL_PHYS_CALLBACKS_HPP
diff --git a/include/fggl/phys/types.hpp b/include/fggl/phys/types.hpp
index 4f06ade..3b15ec6 100644
--- a/include/fggl/phys/types.hpp
+++ b/include/fggl/phys/types.hpp
@@ -25,6 +25,8 @@
#ifndef FGGL_PHYS_TYPES_HPP
#define FGGL_PHYS_TYPES_HPP
+#include "fggl/phys/callbacks.hpp"
+
namespace fggl::phys {
constexpr float MASS_STATIC = 0.0F;
constexpr float MASS_DEFAULT = 1.0F;
@@ -52,10 +54,15 @@ namespace fggl::phys {
explicit inline Sphere(float rad) : PhyShape(ShapeType::SPHERE), radius(rad) {}
};
+ enum class BodyType {
+ STATIC, KINEMATIC, DYNAMIC
+ };
+
struct RigidBody {
constexpr static const char* name = "phys::Body";
float mass = MASS_DEFAULT;
PhyShape* shape = nullptr;
+ BodyType type = BodyType::DYNAMIC;
[[nodiscard]]
inline bool isStatic() const {
--
GitLab