src/app/states.cpp

   1 #include "MasterState.hpp"
   2
   3 #include "Application.hpp"
   4 #include "../creature/Creature.hpp"
   5 #include "../graphics/Viewport.hpp"
   6 #include "../math/const.hpp"
   7 #include "../world/Body.hpp"
   8 #include "../world/Planet.hpp"
   9 #include "../world/Simulation.hpp"
  10 #include "../world/Sun.hpp"
  11
  12 #include <glm/gtx/vector_angle.hpp>
  13 #include <glm/gtx/euler_angles.hpp>
  14 #include <glm/gtx/rotate_vector.hpp>
  15 #include <glm/gtx/transform.hpp>
  16
  17 #include <iostream>
  18 #include <glm/gtx/io.hpp>
  19
  20
  21 namespace blobs {
  22 namespace app {
  23
  24 MasterState::MasterState(Assets &assets, world::Simulation &sim) noexcept
  25 : State()
  26 , assets(assets)
  27 , sim(sim)
  28 , cam(sim.Root())
  29 , cam_pos(0.0, 0.0, 1.0)
  30 , cam_tgt_pos(0.0, 0.0, 1.0)
  31 , cam_focus(0.0)
  32 , cam_tgt_focus(0.0)
  33 , cam_up(0.0, 1.0, 0.0)
  34 , cam_tgt_up(0.0, 1.0, 0.0)
  35 , cam_dist(5.0)
  36 , cam_orient(PI * 0.375, PI * 0.25, 0.0)
  37 , cam_dragging(false)
  38 , shown_creature(nullptr)
  39 , shown_body(nullptr)
  40 , bp(assets)
  41 , cp(assets)
  42 , rp(sim)
  43 , tp(sim)
  44 , remain(0)
  45 , thirds(0)
  46 , paused(false) {
  47         bp.ZIndex(10.0f);
  48         cp.ZIndex(20.0f);
  49         rp.ZIndex(30.0f);
  50         tp.ZIndex(40.0f);
  51 }
  52
  53 MasterState::~MasterState() noexcept {
  54 }
  55
  56
  57 void MasterState::Show(creature::Creature &c) noexcept {
  58         cam.Reference(c.GetSituation().GetPlanet());
  59         cam.TrackOrientation(true);
  60         cam_orient.x = std::max(0.0, cam_orient.x);
  61         cp.Show(c);
  62         bp.Hide();
  63         tp.SetBody(c.GetSituation().GetPlanet());
  64         shown_creature = &c;
  65         shown_body = nullptr;
  66 }
  67
  68 void MasterState::Show(world::Body &b) noexcept {
  69         cam.Reference(b);
  70         cam.TrackOrientation(false);
  71         bp.Show(b);
  72         cp.Hide();
  73         tp.SetBody(b);
  74         shown_creature = nullptr;
  75         shown_body = &b;
  76 }
  77
  78
  79 void MasterState::OnResize(int w, int h) {
  80         assets.shaders.canvas.Activate();
  81         assets.shaders.canvas.Resize(float(w), float(h));
  82         assets.shaders.alpha_sprite.Activate();
  83         assets.shaders.alpha_sprite.SetVP(glm::mat4(1.0f), glm::ortho(0.0f, float(w), float(h), 0.0f, 1.0e4f, -1.0e4f));
  84
  85         cam.Aspect(float(w), float(h));
  86         assets.shaders.planet_surface.Activate();
  87         assets.shaders.planet_surface.SetVP(cam.View(), cam.Projection());
  88         assets.shaders.sun_surface.Activate();
  89         assets.shaders.sun_surface.SetVP(cam.View(), cam.Projection());
  90         assets.shaders.creature_skin.Activate();
  91         assets.shaders.creature_skin.SetVP(cam.View(), cam.Projection());
  92 }
  93
  94 void MasterState::OnUpdate(int dt) {
  95         remain += dt;
  96 #ifdef NDEBUG
  97         int max_tick = 10;
  98 #else
  99         // one tick per frame when debugging so pausing execution doesn't result in more ticks
 100         int max_tick = 1;
 101 #endif
 102         while (remain >= FrameMS() && max_tick > 0) {
 103                 Tick();
 104                 --max_tick;
 105         }
 106         if (max_tick == 0) {
 107                 // drop remaining
 108                 remain = 0;
 109         }
 110 }
 111
 112 void MasterState::Tick() {
 113         constexpr double dt = 0.01666666666666666666666666666666;
 114         if (!paused) {
 115                 sim.Tick(dt);
 116         }
 117         remain -= FrameMS();
 118         thirds = (thirds + 1) % 3;
 119
 120         // determine where camera should be
 121         double actual_dist = cam_dist;
 122         if (shown_creature) {
 123                 cam_tgt_focus = shown_creature->GetSituation().Position();
 124                 cam_tgt_up = glm::normalize(cam_tgt_focus);
 125                 actual_dist += shown_creature->Size();
 126         } else if (shown_body) {
 127                 cam_tgt_focus = glm::dvec3(0.0);
 128                 cam_tgt_up = glm::dvec3(0.0, 1.0, 0.0);
 129                 actual_dist += shown_body->Radius();
 130         }
 131
 132         glm::dvec3 dir(0.0, 0.0, -actual_dist);
 133         glm::dvec3 ref_dir(glm::normalize(glm::cross(cam_tgt_up, glm::dvec3(-cam_tgt_up.z, cam_tgt_up.x, cam_tgt_up.y))));
 134         dir =
 135                 glm::dmat3(ref_dir, cam_tgt_up, glm::cross(ref_dir, cam_tgt_up))
 136                 * glm::dmat3(glm::eulerAngleYX(-cam_orient.y, -cam_orient.x))
 137                 * dir;
 138         cam_tgt_up = glm::rotate(cam_tgt_up, cam_orient.z, glm::normalize(-dir));
 139         cam_tgt_pos = cam_tgt_focus - dir;
 140
 141         // approach target location
 142         glm::dvec3 cam_pos_diff(cam_tgt_pos - cam_pos);
 143         if (glm::length2(cam_pos_diff) > 0.000001) {
 144                 cam_pos += cam_pos_diff * 0.25;
 145         } else {
 146                 cam_pos = cam_tgt_pos;
 147         }
 148
 149         glm::dvec3 cam_focus_diff(cam_tgt_focus - cam_focus);
 150         if (glm::length2(cam_focus_diff) > 0.000001) {
 151                 cam_focus += cam_focus_diff * 0.25;
 152         } else {
 153                 cam_focus = cam_tgt_focus;
 154         }
 155
 156         double cam_up_diff = glm::angle(cam_up, cam_tgt_up);
 157         if (cam_up_diff > 0.001) {
 158                 cam_up = glm::rotate(cam_up, cam_up_diff * 0.25, glm::normalize(glm::cross(cam_up, cam_tgt_up)));
 159         } else {
 160                 cam_up = cam_tgt_up;
 161         }
 162 }
 163
 164 int MasterState::FrameMS() const noexcept {
 165         return thirds == 0 ? 16 : 17;
 166 }
 167
 168
 169 void MasterState::OnKeyDown(const SDL_KeyboardEvent &e) {
 170         if (e.keysym.sym == SDLK_p) {
 171                 paused = !paused;
 172         } else if (e.keysym.sym == SDLK_F1) {
 173                 rp.Toggle();
 174         }
 175 }
 176
 177 void MasterState::OnMouseDown(const SDL_MouseButtonEvent &e) {
 178         if (e.button == SDL_BUTTON_RIGHT) {
 179                 SDL_SetRelativeMouseMode(SDL_TRUE);
 180                 cam_dragging = true;
 181         }
 182 }
 183
 184 void MasterState::OnMouseUp(const SDL_MouseButtonEvent &e) {
 185         if (e.button == SDL_BUTTON_LEFT) {
 186                 glm::dmat4 inverse(glm::inverse(cam.Projection() * cam.View()));
 187                 math::Ray ray(inverse * App().GetViewport().ShootPixel(e.x, e.y));
 188
 189                 shown_creature = nullptr;
 190                 double closest_dist = std::numeric_limits<double>::infinity();
 191                 for (creature::Creature *c : sim.LiveCreatures()) {
 192                         glm::dvec3 normal(0.0);
 193                         double dist = 0.0;
 194                         if (Intersect(ray, c->CollisionBounds(), glm::dmat4(cam.Model(c->GetSituation().GetPlanet())) * c->CollisionTransform(), normal, dist)
 195                                 && dist < closest_dist) {
 196                                 shown_creature = c;
 197                                 closest_dist = dist;
 198                         }
 199                 }
 200
 201                 shown_body = nullptr;
 202                 for (world::Body *b : sim.Bodies()) {
 203                         glm::dvec3 normal(0.0);
 204                         double dist = 0.0;
 205                         if (Intersect(ray, glm::dmat4(cam.Model(*b)) * b->CollisionBounds(), normal, dist) && dist < closest_dist) {
 206                                 shown_creature = nullptr;
 207                                 shown_body = b;
 208                                 closest_dist = dist;
 209                         }
 210                 }
 211
 212                 if (shown_creature) {
 213                         Show(*shown_creature);
 214                 } else if (shown_body) {
 215                         Show(*shown_body);
 216                 } else {
 217                         cp.Hide();
 218                         bp.Hide();
 219                 }
 220         } else if (e.button == SDL_BUTTON_RIGHT) {
 221                 SDL_SetRelativeMouseMode(SDL_FALSE);
 222                 cam_dragging = false;
 223         }
 224 }
 225
 226 void MasterState::OnMouseMotion(const SDL_MouseMotionEvent &e) {
 227         constexpr double pitch_scale = PI * 0.001;
 228         constexpr double yaw_scale = PI * 0.002;
 229         if (cam_dragging) {
 230                 cam_orient.x = glm::clamp(cam_orient.x + double(e.yrel) * pitch_scale, shown_creature ? 0.0 : PI * -0.499, PI * 0.499);
 231                 cam_orient.y = std::fmod(cam_orient.y + double(e.xrel) * yaw_scale, PI * 2.0);
 232         }
 233 }
 234
 235 void MasterState::OnMouseWheel(const SDL_MouseWheelEvent &e) {
 236         constexpr double roll_scale = PI * 0.0625;
 237         constexpr double zoom_scale = -1.0;
 238         constexpr double zoom_base = 1.125;
 239         cam_orient.z = glm::clamp(cam_orient.z + double(e.x) * roll_scale, PI * -0.5, PI * 0.5);
 240         cam_dist = std::max(0.125, cam_dist * std::pow(zoom_base, double(e.y) * zoom_scale));
 241 }
 242
 243 void MasterState::OnRender(graphics::Viewport &viewport) {
 244         cam.LookAt(cam_pos, cam_focus, cam_up);
 245         assets.shaders.planet_surface.Activate();
 246         assets.shaders.planet_surface.SetV(cam.View());
 247         assets.shaders.sun_surface.Activate();
 248         assets.shaders.sun_surface.SetV(cam.View());
 249         assets.shaders.creature_skin.Activate();
 250         assets.shaders.creature_skin.SetV(cam.View());
 251
 252         int num_lights = 0;
 253         for (auto sun : sim.Suns()) {
 254                 glm::vec3 pos(cam.View() * cam.Model(*sun)[3]);
 255                 assets.shaders.planet_surface.Activate();
 256                 assets.shaders.planet_surface.SetLight(num_lights, pos, glm::vec3(sun->Color()), float(sun->Luminosity()));
 257                 assets.shaders.creature_skin.Activate();
 258                 assets.shaders.creature_skin.SetLight(num_lights, pos, glm::vec3(sun->Color()), float(sun->Luminosity()));
 259                 ++num_lights;
 260                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 261                         break;
 262                 }
 263         }
 264         for (auto planet : sim.Planets()) {
 265                 // TODO: indirect light from planets, calculate strength and get color somehow
 266                 glm::vec3 pos(cam.View() * cam.Model(*planet)[3]);
 267                 glm::vec3 col(1.0f, 1.0f, 1.0f);
 268                 float str = 10.0f;
 269                 assets.shaders.planet_surface.Activate();
 270                 assets.shaders.planet_surface.SetLight(num_lights, pos, col, str);
 271                 assets.shaders.creature_skin.Activate();
 272                 assets.shaders.creature_skin.SetLight(num_lights, pos, col, str);
 273                 ++num_lights;
 274                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 275                         break;
 276                 }
 277         }
 278         assets.shaders.planet_surface.Activate();
 279         assets.shaders.planet_surface.SetNumLights(num_lights);
 280         assets.shaders.creature_skin.Activate();
 281         assets.shaders.creature_skin.SetNumLights(num_lights);
 282
 283         assets.shaders.planet_surface.Activate();
 284         assets.shaders.planet_surface.SetTexture(assets.textures.tiles);
 285         for (auto planet : sim.Planets()) {
 286                 assets.shaders.planet_surface.SetM(cam.Model(*planet));
 287                 planet->Draw(assets, viewport);
 288         }
 289
 290         assets.shaders.sun_surface.Activate();
 291         for (auto sun : sim.Suns()) {
 292                 double sun_radius = sun->Radius();
 293                 assets.shaders.sun_surface.SetM(
 294                         cam.Model(*sun) * glm::scale(glm::vec3(sun_radius, sun_radius, sun_radius)));
 295                 assets.shaders.sun_surface.SetLight(glm::vec3(sun->Color()), float(sun->Luminosity()));
 296                 assets.shaders.sun_surface.Draw();
 297         }
 298
 299         assets.shaders.creature_skin.Activate();
 300         assets.shaders.creature_skin.SetTexture(assets.textures.skins);
 301         // TODO: extend to nearby bodies as well
 302         for (auto c : cam.Reference().Creatures()) {
 303                 assets.shaders.creature_skin.SetM(cam.Model(cam.Reference()) * glm::mat4(c->LocalTransform()));
 304                 assets.shaders.creature_skin.SetBaseColor(glm::vec3(c->BaseColor()));
 305                 assets.shaders.creature_skin.SetHighlightColor(glm::vec4(c->HighlightColor()));
 306                 c->Draw(viewport);
 307         }
 308
 309         viewport.ClearDepth();
 310         bp.Draw(viewport);
 311         cp.Draw(viewport);
 312         rp.Draw(viewport);
 313         tp.Draw(viewport);
 314 }
 315
 316 }
 317 }