feat: improve fps controller / add fog and ambient light to the scene

destrum/assets_src/shaders/mesh.frag

@@ -91,16 +91,17 @@ void main()
             diffuseColor, roughness, metallic, f0, shadow);
     }
 
-    // emissive
     vec3 emissiveColor = material.emissiveColor.rgb * sampleTexture2D(material.emissiveTex, samplerID, inUV).rgb;
     fragColor += emissiveColor;
 
-    // ambient, the specular part keeps metals from turning black without lights
     float NoV = clamp(dot(n, v), 0.0001, 1.0);
     vec3 ambientLight = pcs.sceneData.ambientColor * pcs.sceneData.ambientIntensity;
     vec3 ambientSpecular = envBRDFApprox(f0, roughness, NoV);
     fragColor += (diffuseColor + ambientSpecular) * ambientLight * ambientOcclusion;
 
+    float fogAmount = pcs.sceneData.fogDensity * length(cameraPos - fragPos);
+    fragColor = mix(pcs.sceneData.fogColor, fragColor, exp(-fogAmount * fogAmount));
+
     if (pcs.sceneData.debugLightHeatmap != 0) {
         fragColor = mix(fragColor, lightHeatmapColor(tileLightCount), 0.5);
     }

destrum/include/destrum/Components/Physics/Rigidbody.h

@@ -58,6 +58,9 @@ public:
     [[nodiscard]] bool AllowsSleep() const { return m_AllowSleep; }
     void SetAllowSleep(bool allowSleep) { m_AllowSleep = allowSleep; NotifyPhysicsChanged(); }
 
+    [[nodiscard]] bool FreezesRotation() const { return m_FreezeRotation; }
+    void SetFreezeRotation(bool freezeRotation) { m_FreezeRotation = freezeRotation; NotifyPhysicsChanged(); }
+
     [[nodiscard]] PhysicsWorld* GetPhysicsWorld() const { return m_World; }
 
 private:
@@ -72,4 +75,5 @@ private:
 
     bool m_UseGravity{true};
     bool m_AllowSleep{true};
+    bool m_FreezeRotation{false};
 };

destrum/include/destrum/Graphics/Pipelines/SkyboxPipeline.h

@@ -20,7 +20,7 @@ public:
     void init(GfxDevice& gfxDevice, RenderResources& resources, VkFormat drawImageFormat, VkFormat depthImageFormat);
     void cleanup(VkDevice device);
 
-    void draw(VkCommandBuffer cmd,  RenderResources& resources, const Camera& camera);
+    void draw(VkCommandBuffer cmd,  RenderResources& resources, const Camera& camera, float rotation);
 
     void setSkyboxImage(const ImageID skyboxId);
 
@@ -30,8 +30,6 @@ private:
     std::unique_ptr<Pipeline> pipeline;
     ImageID skyboxTextureId{NULL_IMAGE_ID};
 
-    glm::mat4 skyboxRotation{1.f};
-
     struct SkyboxPushConstants {
         glm::mat4  invViewProj;
         glm::vec4  skyboxRot[3];

destrum/include/destrum/Graphics/Renderer.h

@@ -34,6 +34,7 @@ public:
         float ambientIntensity;
         glm::vec3 fogColor;
         float fogDensity;
+        float skyboxRotation{0.0f}; // radians around the world up axis
     };
 
     explicit GameRenderer();

destrum/include/destrum/Physics/JoltPhysicsWorld.h

@@ -53,7 +53,8 @@ public:
     bool Raycast(const glm::vec3& origin,
                  const glm::vec3& direction,
                  float maxDistance,
-                 PhysicsRaycastHit& hit) const override;
+                 PhysicsRaycastHit& hit,
+                 PhysicsBodyHandle ignoreBody = {}) const override;
 
     std::vector<TriggerEvent> ConsumeTriggerEvents() override;
 

destrum/include/destrum/Physics/PhysicsTypes.h

@@ -115,6 +115,7 @@ struct PhysicsBodyDesc {
     float mass{1.0f};
     bool useGravity{true};
     bool allowSleep{true};
+    bool freezeRotation{false};
 };
 
 struct TriggerEvent {

destrum/include/destrum/Physics/PhysicsWorld.h

@@ -46,10 +46,12 @@ public:
     virtual void AddForce(PhysicsBodyHandle body, const glm::vec3& force) = 0;
     virtual void AddImpulse(PhysicsBodyHandle body, const glm::vec3& impulse) = 0;
 
+    // Triggers are never hit. ignoreBody is skipped too, e.g. so a character can cast from inside its own collider
     virtual bool Raycast(const glm::vec3& origin,
                          const glm::vec3& direction,
                          float maxDistance,
-                         PhysicsRaycastHit& hit) const = 0;
+                         PhysicsRaycastHit& hit,
+                         PhysicsBodyHandle ignoreBody = {}) const = 0;
 
     // Trigger events accumulated during the last Step().
     virtual std::vector<TriggerEvent> ConsumeTriggerEvents() { return {}; }

destrum/include/destrum/Physics/SimplePhysicsWorld.h

@@ -46,7 +46,8 @@ public:
     bool Raycast(const glm::vec3& origin,
                  const glm::vec3& direction,
                  float maxDistance,
-                 PhysicsRaycastHit& hit) const override;
+                 PhysicsRaycastHit& hit,
+                 PhysicsBodyHandle ignoreBody = {}) const override;
 
     void SyncKinematicBodiesToPhysics();
     void SyncDynamicBodiesToTransforms();

destrum/include/destrum/Scene/Scene.h

@@ -14,6 +14,18 @@
 
 class CameraComponent;
 class GameObject;
+
+
+struct SceneEnvironment {
+    glm::vec3 ambientColor{0.1f};
+    float ambientIntensity{0.5f};
+
+    glm::vec3 fogColor{0.5f};
+    float fogDensity{0.0f};
+
+    float skyboxRotationSpeed{0.01f};
+    float skyboxRotation{0.0f};
+};
 class SceneSerializer;
 class PhysicsWorld;
 
@@ -107,6 +119,9 @@ public:
 
     PhysicsSceneBridge& GetPhysics() { return m_Physics; }
 
+    [[nodiscard]] SceneEnvironment& GetEnvironment() { return m_Environment; }
+    [[nodiscard]] const SceneEnvironment& GetEnvironment() const { return m_Environment; }
+
     [[nodiscard]] CameraComponent* GetCurrentCamera() const;
     [[nodiscard]] std::vector<CameraComponent*> GetCameras() const;
     void SetCurrentCamera(const CameraComponent* camera);
@@ -134,6 +149,10 @@ private:
 
     ObjectId m_CurrentCameraId{InvalidObjectId};
 
+    SceneEnvironment m_Environment{};
+
+    void DrawSettingsImGui();
+
     std::function<void()> m_registerBindings;
     std::function<void()> m_unregisterBindings;
     bool m_bindingsUnloaded{false};

destrum/include/destrum/Util/DeltaTime.h

@@ -14,6 +14,10 @@ public:
     [[nodiscard]] double FixedDeltaTime() const;
     [[nodiscard]] double DeltaTime() const;
 
+    // How far the current frame is between the last two fixed steps (0..1), used to interpolate physics objects
+    [[nodiscard]] float FixedAlpha() const { return m_FixedAlpha; }
+    void SetFixedAlpha(float alpha) { m_FixedAlpha = alpha; }
+
     [[nodiscard]] std::chrono::nanoseconds SleepDuration() const;
 
     void Update();
@@ -25,6 +29,7 @@ private:
     static constexpr double m_FixedDeltaTime{1.0 / 60.0};
     static constexpr double FPS{60};
     double m_DeltaTime{};
+    float m_FixedAlpha{1.0f};
     std::chrono::high_resolution_clock::time_point m_PrevTime;
 };
 

destrum/include/destrum/Util/ImGuiUtils.h

@@ -24,6 +24,7 @@ namespace ImGuiUtils {
         const std::vector<std::shared_ptr<GameObject>>& pendingAdditions,
         ObjectId& selectedObjectId,
         const std::function<GameObject*()>& createGameObject,
+        const std::function<void()>& drawSceneSettings,
         bool* open = nullptr);
 }
 

destrum/src/App.cpp

@@ -1,3 +1,4 @@
+#include <algorithm>
 #include <chrono>
 #include <exception>
 #include <SDL_vulkan.h>
@@ -274,8 +275,7 @@ if (!isRunning) break;
             TracyPlot("Fixed Steps", static_cast<int64_t>(steps));
         }
 
-        const float alpha = accumulator / fixedDt;
-        (void)alpha;
+        Time::GetInstance().SetFixedAlpha(std::clamp(accumulator / fixedDt, 0.0f, 1.0f));
 
         {
             ZoneScopedN("Swapchain Resize Check");

destrum/src/Components/Physics/Rigidbody.cpp

@@ -106,7 +106,8 @@ nlohmann::json Rigidbody::Serialize() const {
         {"friction", m_Friction},
         {"restitution", m_Restitution},
         {"useGravity", m_UseGravity},
-        {"allowSleep", m_AllowSleep}
+        {"allowSleep", m_AllowSleep},
+        {"freezeRotation", m_FreezeRotation}
     };
 }
 
@@ -129,6 +130,9 @@ void Rigidbody::Deserialize(const nlohmann::json& data) {
     if (data.contains("allowSleep")) {
         m_AllowSleep = data.at("allowSleep").get<bool>();
     }
+    if (data.contains("freezeRotation")) {
+        m_FreezeRotation = data.at("freezeRotation").get<bool>();
+    }
 }
 
 void Rigidbody::ImGuiInspector() {
@@ -163,6 +167,11 @@ void Rigidbody::ImGuiInspector() {
         SetAllowSleep(allowSleep);
     }
 
+    bool freezeRotation = m_FreezeRotation;
+    if (ImGui::Checkbox("Freeze rotation", &freezeRotation)) {
+        SetFreezeRotation(freezeRotation);
+    }
+
     if (HasPhysicsBody()) {
         const glm::vec3 velocity = GetLinearVelocity();
         ImGui::Text(

destrum/src/Graphics/Pipelines/SkyboxPipeline.cpp

@@ -2,7 +2,6 @@
 
 #include <destrum/FS/AssetFS.h>
 #include <glm/glm.hpp>
-#include <destrum/Util/DeltaTime.h>
 
 #include "volk.h"
 #include "glm/ext/matrix_transform.hpp"
@@ -98,26 +97,20 @@ void SkyboxPipeline::cleanup(VkDevice device)
 void SkyboxPipeline::draw(
     VkCommandBuffer cmd,
     RenderResources& resources,
-    const Camera& camera)
+    const Camera& camera,
+    float rotation)
 {
     if (skyboxTextureId == NULL_IMAGE_ID) {
         return;
     }
 
-    const float rotationSpeed = 0.01f;
-
-    skyboxRotation = glm::rotate(
-        skyboxRotation,
-        rotationSpeed * static_cast<float>(Time::GetInstance().DeltaTime()),
-        glm::vec3(0.f, 1.f, 0.f));
-
     pipeline->bind(cmd);
 
     vkCmdSetPolygonModeEXT(cmd, VK_POLYGON_MODE_FILL);
 
     resources.bindBindlessDescSet(cmd, pipelineLayout);
 
-    const glm::mat3 r = glm::mat3(skyboxRotation);
+    const glm::mat3 r = glm::mat3(glm::rotate(glm::mat4{1.f}, rotation, glm::vec3(0.f, 1.f, 0.f)));
 
     // rotation only, translation in the inverse makes the sky jitter far from the origin
     const glm::mat4 viewRotation = glm::mat4(glm::mat3(camera.GetViewMatrix()));

destrum/src/Graphics/Renderer.cpp

@@ -306,7 +306,7 @@ void GameRenderer::draw(VkCommandBuffer cmd, GfxDevice& gfxDevice, const Camera&
         TracyVkZone(gfxDevice.getTracyVkCtx(), cmd, "SkyboxPipeline::draw");
         vkutil::ScopedCmdLabel label(cmd, "SkyboxPipeline::draw", vkutil::labelColors::sky);
 
-        skyboxPipeline->draw(cmd, *resources, camera);
+        skyboxPipeline->draw(cmd, *resources, camera, sceneData.skyboxRotation);
     }
 
     {

destrum/src/Physics/JoltPhysicsWorld.cpp

@@ -7,6 +7,7 @@
 #include <Jolt/Core/JobSystemThreadPool.h>
 #include <Jolt/Core/TempAllocator.h>
 #include <Jolt/Physics/Body/BodyCreationSettings.h>
+#include <Jolt/Physics/Body/BodyFilter.h>
 #include <Jolt/Physics/Body/BodyInterface.h>
 #include <Jolt/Physics/Body/MotionType.h>
 #include <Jolt/Physics/Collision/BroadPhase/BroadPhaseLayer.h>
@@ -95,6 +96,29 @@ namespace
         }
     }
 
+    // Raycasts skip triggers and optionally one body (e.g. the caster's own collider)
+    class RaycastBodyFilter final : public BodyFilter
+    {
+    public:
+        explicit RaycastBodyFilter(const BodyID& ignoredBody)
+            : m_IgnoredBody(ignoredBody)
+        {
+        }
+
+        bool ShouldCollide(const BodyID& inBodyID) const override
+        {
+            return inBodyID != m_IgnoredBody;
+        }
+
+        bool ShouldCollideLocked(const Body& inBody) const override
+        {
+            return !inBody.IsSensor();
+        }
+
+    private:
+        BodyID m_IgnoredBody;
+    };
+
     namespace Layers
     {
         static constexpr ObjectLayer NON_MOVING = 0;
@@ -447,6 +471,10 @@ public:
         settings.mIsSensor = desc.shape.isTrigger;
         settings.mAllowSleeping = desc.allowSleep;
         settings.mGravityFactor = desc.useGravity ? 1.0f : 0.0f;
+        if (desc.freezeRotation)
+        {
+            settings.mAllowedDOFs = EAllowedDOFs::TranslationX | EAllowedDOFs::TranslationY | EAllowedDOFs::TranslationZ;
+        }
         settings.mUserData = reinterpret_cast<JPH::uint64>(desc.owner);
 
         if (desc.type == RigidbodyType::Dynamic)
@@ -631,7 +659,8 @@ public:
     bool Raycast(const glm::vec3& origin,
                  const glm::vec3& direction,
                  float maxDistance,
-                 PhysicsRaycastHit& hit) const
+                 PhysicsRaycastHit& hit,
+                 PhysicsBodyHandle ignoreBody) const
     {
         if (maxDistance <= 0.0f || glm::length2(direction) <= 0.0000001f)
         {
@@ -645,8 +674,12 @@ public:
             ToJoltVec3(directionNormalized * maxDistance)
         };
 
+        const BodyRecord* ignored = ignoreBody.IsValid() ? FindBody(ignoreBody) : nullptr;
+        const RaycastBodyFilter bodyFilter(ignored != nullptr ? ignored->bodyID : BodyID{});
+
         RayCastResult result{};
-        if (!m_PhysicsSystem.GetNarrowPhaseQuery().CastRay(ray, result))
+        if (!m_PhysicsSystem.GetNarrowPhaseQuery().CastRay(
+                ray, result, BroadPhaseLayerFilter{}, ObjectLayerFilter{}, bodyFilter))
         {
             return false;
         }
@@ -838,9 +871,10 @@ void JoltPhysicsWorld::AddImpulse(PhysicsBodyHandle body, const glm::vec3& impul
 bool JoltPhysicsWorld::Raycast(const glm::vec3& origin,
                                const glm::vec3& direction,
                                float maxDistance,
-                               PhysicsRaycastHit& hit) const
+                               PhysicsRaycastHit& hit,
+                               PhysicsBodyHandle ignoreBody) const
 {
-    return m_Impl->Raycast(origin, direction, maxDistance, hit);
+    return m_Impl->Raycast(origin, direction, maxDistance, hit, ignoreBody);
 }
 
 std::vector<TriggerEvent> JoltPhysicsWorld::ConsumeTriggerEvents()

destrum/src/Physics/PhysicsWorld.cpp

@@ -70,6 +70,7 @@ void PhysicsWorld::RegisterRigidbody(Rigidbody& rigidbody) {
     desc.mass = rigidbody.GetMass();
     desc.useGravity = rigidbody.UsesGravity();
     desc.allowSleep = rigidbody.AllowsSleep();
+    desc.freezeRotation = rigidbody.FreezesRotation();
     desc.material.friction = rigidbody.GetFriction();
     desc.material.restitution = rigidbody.GetRestitution();
 

destrum/src/Physics/SimplePhysicsWorld.cpp

@@ -165,7 +165,8 @@ void SimplePhysicsWorld::SyncDynamicBodiesToTransforms() {
 bool SimplePhysicsWorld::Raycast(const glm::vec3& origin,
                                  const glm::vec3& direction,
                                  float maxDistance,
-                                 PhysicsRaycastHit& hit) const {
+                                 PhysicsRaycastHit& hit,
+                                 PhysicsBodyHandle ignoreBody) const {
     if (maxDistance <= 0.0f) {
         return false;
     }
@@ -183,7 +184,9 @@ bool SimplePhysicsWorld::Raycast(const glm::vec3& origin,
     for (const BodyRecord& body : m_Bodies) {
         if (!body.alive || body.desc.shape.type == PhysicsShapeType::None ||
             !body.desc.owner || body.desc.owner->IsBeingDestroyed() ||
-            !body.desc.owner->IsActiveInHierarchy()) {
+            !body.desc.owner->IsActiveInHierarchy() ||
+            body.desc.shape.isTrigger ||
+            (ignoreBody.IsValid() && body.handle.id == ignoreBody.id)) {
             continue;
         }
 

destrum/src/Scene/Scene.cpp

@@ -4,6 +4,10 @@
 #include <destrum/Util/ImGuiUtils.h>
 
 #include <algorithm>
+#include <cmath>
+
+#include <glm/gtc/constants.hpp>
+#include <imgui.h>
 
 unsigned int Scene::m_idCounter = 0;
 
@@ -131,6 +135,32 @@ void Scene::Update(float dt) {
         }
     }
 
+    m_Environment.skyboxRotation = std::fmod(
+        m_Environment.skyboxRotation + m_Environment.skyboxRotationSpeed * dt,
+        glm::two_pi<float>());
+}
+
+void Scene::DrawSettingsImGui() {
+    SceneEnvironment& environment = m_Environment;
+
+    ImGui::SeparatorText("Ambient");
+    ImGui::ColorEdit3("Ambient color", &environment.ambientColor.x);
+    ImGui::DragFloat("Ambient intensity", &environment.ambientIntensity, 0.01f, 0.0f, 100.0f);
+
+    ImGui::SeparatorText("Fog");
+    ImGui::ColorEdit3("Fog color", &environment.fogColor.x, ImGuiColorEditFlags_HDR | ImGuiColorEditFlags_Float);
+    ImGui::DragFloat("Fog density", &environment.fogDensity, 0.001f, 0.0f, 1.0f, "%.4f");
+
+    ImGui::SeparatorText("Skybox");
+    float speedDegrees = glm::degrees(environment.skyboxRotationSpeed);
+    if (ImGui::DragFloat("Spin (deg/s)", &speedDegrees, 0.05f)) {
+        environment.skyboxRotationSpeed = glm::radians(speedDegrees);
+    }
+
+    float rotationDegrees = glm::degrees(environment.skyboxRotation);
+    if (ImGui::SliderFloat("Rotation (deg)", &rotationDegrees, -360.0f, 360.0f)) {
+        environment.skyboxRotation = glm::radians(rotationDegrees);
+    }
 }
 
 void Scene::FixedUpdate(float dt) {
@@ -200,6 +230,7 @@ void Scene::RenderImgui(bool* open) {
         m_pendingAdditions,
         m_SelectedObjectId,
         [this] { return CreateGameObject("GameObject"); },
+        [this] { DrawSettingsImGui(); },
         open);
 }
 

destrum/src/Serialization/SceneSerializer.cpp

@@ -300,6 +300,15 @@ bool SceneSerializer::Save(Scene& scene, const std::filesystem::path& path) {
     if (scene.m_CurrentCameraId != InvalidObjectId) {
         root["currentCamera"] = scene.m_CurrentCameraId;
     }
+    const SceneEnvironment& environment = scene.GetEnvironment();
+    root["environment"] = {
+        {"ambientColor", {environment.ambientColor.x, environment.ambientColor.y, environment.ambientColor.z}},
+        {"ambientIntensity", environment.ambientIntensity},
+        {"fogColor", {environment.fogColor.x, environment.fogColor.y, environment.fogColor.z}},
+        {"fogDensity", environment.fogDensity},
+        {"skyboxRotationSpeed", environment.skyboxRotationSpeed},
+        {"skyboxRotation", environment.skyboxRotation},
+    };
 
     for (const auto& objectPtr : scene.GetObjects()) {
         if (!objectPtr || objectPtr->IsBeingDestroyed()) {
@@ -573,6 +582,23 @@ bool SceneSerializer::ConstructScene(Scene& scene, LoadResult& result,
         scene.m_name = root.at("name").get<std::string>();
     }
     scene.m_CurrentCameraId = root.value("currentCamera", InvalidObjectId);
+    scene.m_Environment = SceneEnvironment{};
+    if (root.contains("environment") && root.at("environment").is_object()) {
+        const auto& data = root.at("environment");
+        SceneEnvironment& environment = scene.m_Environment;
+        const auto readColor = [&data](const char* key, glm::vec3& color) {
+            if (data.contains(key) && data.at(key).is_array() && data.at(key).size() == 3) {
+                const auto& value = data.at(key);
+                color = {value.at(0).get<float>(), value.at(1).get<float>(), value.at(2).get<float>()};
+            }
+        };
+        readColor("ambientColor", environment.ambientColor);
+        environment.ambientIntensity = data.value("ambientIntensity", environment.ambientIntensity);
+        readColor("fogColor", environment.fogColor);
+        environment.fogDensity = data.value("fogDensity", environment.fogDensity);
+        environment.skyboxRotationSpeed = data.value("skyboxRotationSpeed", environment.skyboxRotationSpeed);
+        environment.skyboxRotation = data.value("skyboxRotation", environment.skyboxRotation);
+    }
 
     if (progressCallback) progressCallback(0.9f);
 

destrum/src/Util/ImGuiUtils.cpp

@@ -125,6 +125,7 @@ namespace ImGuiUtils {
         const std::vector<std::shared_ptr<GameObject>>& pendingAdditions,
         ObjectId& selectedObjectId,
         const std::function<GameObject*()>& createGameObject,
+        const std::function<void()>& drawSceneSettings,
         bool* open) {
         RegisterEngineComponents();
 
@@ -176,6 +177,9 @@ namespace ImGuiUtils {
                 }
             }
         }
+        if (drawSceneSettings && ImGui::CollapsingHeader("Scene Settings")) {
+            drawSceneSettings();
+        }
         ImGui::Separator();
 
         const float availableWidth = ImGui::GetContentRegionAvail().x;