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/transform.hpp>
  13
  14 #include <iostream>
  15 #include <glm/gtx/io.hpp>
  16
  17
  18 namespace blobs {
  19 namespace app {
  20
  21 MasterState::MasterState(Assets &assets, world::Simulation &sim) noexcept
  22 : State()
  23 , assets(assets)
  24 , sim(sim)
  25 , cam(sim.Root())
  26 , cam_dist(5.0)
  27 , cam_tgt_dist(5.0)
  28 , cam_orient(PI * 0.375, PI * 0.25, 0.0)
  29 , cam_dragging(false)
  30 , bp(assets)
  31 , cp(assets)
  32 , rp(sim)
  33 , tp(sim)
  34 , remain(0)
  35 , thirds(0)
  36 , paused(false) {
  37         bp.ZIndex(10.0f);
  38         cp.ZIndex(20.0f);
  39         rp.ZIndex(30.0f);
  40         tp.ZIndex(40.0f);
  41 }
  42
  43 MasterState::~MasterState() noexcept {
  44 }
  45
  46
  47 void MasterState::OnResize(int w, int h) {
  48         assets.shaders.canvas.Activate();
  49         assets.shaders.canvas.Resize(float(w), float(h));
  50         assets.shaders.alpha_sprite.Activate();
  51         assets.shaders.alpha_sprite.SetVP(glm::mat4(1.0f), glm::ortho(0.0f, float(w), float(h), 0.0f, 1.0e4f, -1.0e4f));
  52
  53         cam.Aspect(float(w), float(h));
  54         assets.shaders.planet_surface.Activate();
  55         assets.shaders.planet_surface.SetVP(cam.View(), cam.Projection());
  56         assets.shaders.sun_surface.Activate();
  57         assets.shaders.sun_surface.SetVP(cam.View(), cam.Projection());
  58         assets.shaders.creature_skin.Activate();
  59         assets.shaders.creature_skin.SetVP(cam.View(), cam.Projection());
  60 }
  61
  62 void MasterState::OnUpdate(int dt) {
  63         remain += dt;
  64 #ifdef NDEBUG
  65         int max_tick = 10;
  66 #else
  67         // one tick per frame when debugging so pausing execution doesn't result in more ticks
  68         int max_tick = 1;
  69 #endif
  70         while (remain >= FrameMS() && max_tick > 0) {
  71                 Tick();
  72                 --max_tick;
  73         }
  74 }
  75
  76 void MasterState::Tick() {
  77         constexpr double dt = 0.01666666666666666666666666666666;
  78         if (!paused) {
  79                 sim.Tick(dt);
  80         }
  81         remain -= FrameMS();
  82         thirds = (thirds + 1) % 3;
  83
  84         double cam_diff = cam_tgt_dist - cam_dist;
  85         if (std::abs(cam_diff) > 0.001) {
  86                 cam_dist += cam_diff * 0.25;
  87         } else {
  88                 cam_dist = cam_tgt_dist;
  89         }
  90 }
  91
  92 int MasterState::FrameMS() const noexcept {
  93         return thirds == 0 ? 16 : 17;
  94 }
  95
  96
  97 void MasterState::OnKeyDown(const SDL_KeyboardEvent &e) {
  98         if (e.keysym.sym == SDLK_p) {
  99                 paused = !paused;
 100         } else if (e.keysym.sym == SDLK_F1) {
 101                 rp.Toggle();
 102         }
 103 }
 104
 105 void MasterState::OnMouseDown(const SDL_MouseButtonEvent &e) {
 106         if (e.button == SDL_BUTTON_RIGHT) {
 107                 SDL_SetRelativeMouseMode(SDL_TRUE);
 108                 cam_dragging = true;
 109         }
 110 }
 111
 112 void MasterState::OnMouseUp(const SDL_MouseButtonEvent &e) {
 113         if (e.button == SDL_BUTTON_LEFT) {
 114                 glm::dmat4 inverse(glm::inverse(cam.Projection() * cam.View()));
 115                 math::Ray ray(inverse * App().GetViewport().ShootPixel(e.x, e.y));
 116
 117                 creature::Creature *closest_creature = nullptr;
 118                 double closest_dist = std::numeric_limits<double>::infinity();
 119                 for (creature::Creature *c : sim.LiveCreatures()) {
 120                         glm::dvec3 normal(0.0);
 121                         double dist = 0.0;
 122                         if (Intersect(ray, c->CollisionBounds(), glm::dmat4(cam.Model(c->GetSituation().GetPlanet())) * c->CollisionTransform(), normal, dist)
 123                                 && dist < closest_dist) {
 124                                 closest_creature = c;
 125                                 closest_dist = dist;
 126                         }
 127                 }
 128
 129                 world::Body *closest_body = nullptr;
 130                 for (world::Body *b : sim.Bodies()) {
 131                         glm::dvec3 normal(0.0);
 132                         double dist = 0.0;
 133                         if (Intersect(ray, glm::dmat4(cam.Model(*b)) * b->CollisionBounds(), normal, dist) && dist < closest_dist) {
 134                                 closest_creature = nullptr;
 135                                 closest_body = b;
 136                                 closest_dist = dist;
 137                         }
 138                 }
 139
 140                 if (closest_creature) {
 141                         cp.Show(*closest_creature);
 142                         bp.Hide();
 143                 } else if (closest_body) {
 144                         bp.Show(*closest_body);
 145                         cp.Hide();
 146                 } else {
 147                         cp.Hide();
 148                         bp.Hide();
 149                 }
 150         } else if (e.button == SDL_BUTTON_RIGHT) {
 151                 SDL_SetRelativeMouseMode(SDL_FALSE);
 152                 cam_dragging = false;
 153         }
 154 }
 155
 156 void MasterState::OnMouseMotion(const SDL_MouseMotionEvent &e) {
 157         constexpr double pitch_scale = PI * 0.001;
 158         constexpr double yaw_scale = PI * 0.002;
 159         if (cam_dragging) {
 160                 cam_orient.x = glm::clamp(cam_orient.x + double(e.yrel) * pitch_scale, 0.0, PI * 0.499);
 161                 cam_orient.y = std::fmod(cam_orient.y + double(e.xrel) * yaw_scale, PI * 2.0);
 162         }
 163 }
 164
 165 void MasterState::OnMouseWheel(const SDL_MouseWheelEvent &e) {
 166         constexpr double roll_scale = PI * 0.0625;
 167         constexpr double zoom_scale = -1.0;
 168         constexpr double zoom_base = 1.125;
 169         cam_orient.z = glm::clamp(cam_orient.z + double(e.x) * roll_scale, PI * -0.5, PI * 0.5);
 170         if (cp.Shown()) {
 171                 cam_tgt_dist = std::max(cp.GetCreature().Size() * 2.0, cam_tgt_dist * std::pow(zoom_base, double(e.y) * zoom_scale));
 172         } else {
 173                 cam_tgt_dist = std::max(1.0, cam_tgt_dist * std::pow(zoom_base, double(e.y) * zoom_scale));
 174         }
 175 }
 176
 177 void MasterState::OnRender(graphics::Viewport &viewport) {
 178         if (cp.Shown()) {
 179                 cam.Radial(cp.GetCreature(), cam_dist, cam_orient);
 180                 assets.shaders.planet_surface.Activate();
 181                 assets.shaders.planet_surface.SetV(cam.View());
 182                 assets.shaders.sun_surface.Activate();
 183                 assets.shaders.sun_surface.SetV(cam.View());
 184                 assets.shaders.creature_skin.Activate();
 185                 assets.shaders.creature_skin.SetV(cam.View());
 186         }
 187
 188         int num_lights = 0;
 189         for (auto sun : sim.Suns()) {
 190                 // TODO: source sun's light color and strength
 191                 glm::vec3 pos(cam.View() * cam.Model(*sun)[3]);
 192                 glm::vec3 col(1.0f, 1.0f, 1.0f);
 193                 float str = 1.0e6f;
 194                 assets.shaders.planet_surface.Activate();
 195                 assets.shaders.planet_surface.SetLight(num_lights, pos, col, str);
 196                 assets.shaders.creature_skin.Activate();
 197                 assets.shaders.creature_skin.SetLight(num_lights, pos, col, str);
 198                 ++num_lights;
 199                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 200                         break;
 201                 }
 202         }
 203         for (auto planet : sim.Planets()) {
 204                 // TODO: indirect light from planets, calculate strength and get color somehow
 205                 glm::vec3 pos(cam.View() * cam.Model(*planet)[3]);
 206                 glm::vec3 col(1.0f, 1.0f, 1.0f);
 207                 float str = 10.0f;
 208                 assets.shaders.planet_surface.Activate();
 209                 assets.shaders.planet_surface.SetLight(num_lights, pos, col, str);
 210                 assets.shaders.creature_skin.Activate();
 211                 assets.shaders.creature_skin.SetLight(num_lights, pos, col, str);
 212                 ++num_lights;
 213                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 214                         break;
 215                 }
 216         }
 217         assets.shaders.planet_surface.Activate();
 218         assets.shaders.planet_surface.SetNumLights(num_lights);
 219         assets.shaders.creature_skin.Activate();
 220         assets.shaders.creature_skin.SetNumLights(num_lights);
 221
 222         assets.shaders.planet_surface.Activate();
 223         assets.shaders.planet_surface.SetTexture(assets.textures.tiles);
 224         for (auto planet : sim.Planets()) {
 225                 assets.shaders.planet_surface.SetM(cam.Model(*planet));
 226                 planet->Draw(assets, viewport);
 227         }
 228
 229         assets.shaders.sun_surface.Activate();
 230         for (auto sun : sim.Suns()) {
 231                 double sun_radius = sun->Radius();
 232                 assets.shaders.sun_surface.SetM(
 233                         cam.Model(*sun) * glm::scale(glm::vec3(sun_radius, sun_radius, sun_radius)));
 234                 assets.shaders.sun_surface.SetLight(glm::vec3(1.0f, 1.0f, 1.0f), 1.0e6f);
 235                 assets.shaders.sun_surface.Draw();
 236         }
 237
 238         assets.shaders.creature_skin.Activate();
 239         assets.shaders.creature_skin.SetTexture(assets.textures.skins);
 240         // TODO: extend to nearby bodies as well
 241         for (auto c : cam.Reference().Creatures()) {
 242                 assets.shaders.creature_skin.SetM(cam.Model(cam.Reference()) * glm::mat4(c->LocalTransform()));
 243                 assets.shaders.creature_skin.SetBaseColor(glm::vec3(c->BaseColor()));
 244                 assets.shaders.creature_skin.SetHighlightColor(glm::vec4(c->HighlightColor()));
 245                 c->Draw(viewport);
 246         }
 247
 248         viewport.ClearDepth();
 249         bp.Draw(viewport);
 250         cp.Draw(viewport);
 251         rp.Draw(viewport);
 252         tp.Draw(viewport);
 253 }
 254
 255 }
 256 }