camera controls

[blobs.git] / src / app / states.cpp

diff --git a/src/app/states.cpp b/src/app/states.cpp
index b1a20db92a50740934dfac6849065940c84e4ab6..cfac2fa8450565d4ccf5b4403f3c3ce4e9cb385d 100644 (file)
--- a/src/app/states.cpp
+++ b/src/app/states.cpp
@@ -2,6 +2,7 @@
 
 #include "../creature/Creature.hpp"
 #include "../graphics/Viewport.hpp"
+#include "../math/const.hpp"
 #include "../world/Body.hpp"
 #include "../world/Planet.hpp"
 #include "../world/Simulation.hpp"
@@ -18,6 +19,10 @@ MasterState::MasterState(Assets &assets, world::Simulation &sim) noexcept
 , assets(assets)
 , sim(sim)
 , cam(sim.Root())
+, cam_dist(10.0)
+, cam_tgt_dist(10.0)
+, cam_orient(PI * 0.125, 0.0, 0.0)
+, cam_dragging(false)
 , cp(assets)
 , remain(0)
 , thirds(0)
@@ -51,11 +56,19 @@ void MasterState::OnUpdate(int dt) {
 }
 
 void MasterState::Tick() {
+       constexpr double dt = 0.01666666666666666666666666666666;
        if (!paused) {
-               sim.Tick();
+               sim.Tick(dt);
        }
        remain -= FrameMS();
        thirds = (thirds + 1) % 3;
+
+       double cam_diff = cam_tgt_dist - cam_dist;
+       if (std::abs(cam_diff) > 0.001) {
+               cam_dist += cam_diff * 0.25;
+       } else {
+               cam_dist = cam_tgt_dist;
+       }
 }
 
 int MasterState::FrameMS() const noexcept {
@@ -69,9 +82,40 @@ void MasterState::OnKeyDown(const SDL_KeyboardEvent &e) {
        }
 }
 
+void MasterState::OnMouseDown(const SDL_MouseButtonEvent &e) {
+       if (e.button == SDL_BUTTON_RIGHT) {
+               SDL_SetRelativeMouseMode(SDL_TRUE);
+               cam_dragging = true;
+       }
+}
+
+void MasterState::OnMouseUp(const SDL_MouseButtonEvent &e) {
+       if (e.button == SDL_BUTTON_RIGHT) {
+               SDL_SetRelativeMouseMode(SDL_FALSE);
+               cam_dragging = false;
+       }
+}
+
+void MasterState::OnMouseMotion(const SDL_MouseMotionEvent &e) {
+       constexpr double pitch_scale = PI * 0.001;
+       constexpr double yaw_scale = PI * 0.002;
+       if (cam_dragging) {
+               cam_orient.x = glm::clamp(cam_orient.x + double(e.yrel) * pitch_scale, 0.0, PI * 0.5);
+               cam_orient.y = std::fmod(cam_orient.y + double(e.xrel) * yaw_scale, PI * 2.0);
+       }
+}
+
+void MasterState::OnMouseWheel(const SDL_MouseWheelEvent &e) {
+       constexpr double roll_scale = PI * 0.0625;
+       constexpr double zoom_scale = -1.0;
+       constexpr double zoom_base = 1.125;
+       cam_orient.z = glm::clamp(cam_orient.z + double(e.x) * roll_scale, PI * -0.5, PI * 0.5);
+       cam_tgt_dist = std::max(1.0, cam_tgt_dist * std::pow(zoom_base, double(e.y) * zoom_scale));
+}
+
 void MasterState::OnRender(graphics::Viewport &viewport) {
        if (cp.Shown()) {
-               cam.TopDown(cp.GetCreature(), 10.0f);
+               cam.Radial(cp.GetCreature(), cam_dist, cam_orient);
                assets.shaders.planet_surface.Activate();
                assets.shaders.planet_surface.SetV(cam.View());
                assets.shaders.sun_surface.Activate();