#pragma once
// Our hooks into SceneWindow.dll's scene code, installed once, the first time an engine is made. Each replaces where
// IMVU's code calls a function (an entry of an exported vtable, or a call instruction's target), after checking it
// calls the function expected, with ours, which calls IMVU's: nothing else is changed, and nothing is if a check
// fails (an unexpected SceneWindow.dll: the hooks' features are then off, and the client runs as it would without).
//
// - SceneViewer::step (the IFrameListener vtable): the client's tick, 30 times a second (SceneWindow.dll's runApp
//   calls stepFrame, which steps each scene viewer). Recorded, for the frame pacer and for drawing between ticks.
// - ModelInstance::render's call to updateCalSkeleton, which poses the model before it's drawn: between ticks, the
//   model is posed at the time between them (its animations' times moved on by the fraction of a frame since the
//   tick; Cal3D poses between keyframes) and crossfading animations' weights partway to the next tick's, then its
//   animations are put back as they were.
// - ModelInstance::render's call to ParticleSystem::render: between ticks, particles drawn moved on by their velocity
//   times the time since the tick (as the particle library moves them at each tick), then put back.
// - CameraController::getCameraTransform (its exported vtable): between ticks, the camera where its easing toward its
//   target has brought it since the tick.

#include <cstdint>

namespace t5de::scene_hooks {

void install();

// Whether the hooks are installed.
[[nodiscard]] bool installed();

// When a scene viewer last stepped (QueryPerformanceCounter), or 0 if none has.
[[nodiscard]] std::int64_t lastStep();

} // namespace t5de::scene_hooks