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
  15 namespace blobs {
  16 namespace app {
  17
  18 MasterState::MasterState(Assets &assets, world::Simulation &sim) noexcept
  19 : State()
  20 , assets(assets)
  21 , sim(sim)
  22 , cam(sim.Root())
  23 , cam_dist(5.0)
  24 , cam_tgt_dist(5.0)
  25 , cam_orient(PI * 0.375, PI * 0.25, 0.0)
  26 , cam_dragging(false)
  27 , cp(assets)
  28 , rp(sim)
  29 , tp(sim)
  30 , remain(0)
  31 , thirds(0)
  32 , paused(false) {
  33 }
  34
  35 MasterState::~MasterState() noexcept {
  36 }
  37
  38
  39 void MasterState::OnResize(int w, int h) {
  40         assets.shaders.canvas.Activate();
  41         assets.shaders.canvas.Resize(float(w), float(h));
  42         assets.shaders.alpha_sprite.Activate();
  43         assets.shaders.alpha_sprite.SetVP(glm::mat4(1.0f), glm::ortho(0.0f, float(w), float(h), 0.0f, 1.0e4f, -1.0e4f));
  44
  45         cam.Aspect(float(w), float(h));
  46         assets.shaders.planet_surface.Activate();
  47         assets.shaders.planet_surface.SetVP(cam.View(), cam.Projection());
  48         assets.shaders.sun_surface.Activate();
  49         assets.shaders.sun_surface.SetVP(cam.View(), cam.Projection());
  50         assets.shaders.creature_skin.Activate();
  51         assets.shaders.creature_skin.SetVP(cam.View(), cam.Projection());
  52 }
  53
  54 void MasterState::OnUpdate(int dt) {
  55         remain += dt;
  56 #ifdef NDEBUG
  57         int max_tick = 10;
  58 #else
  59         // one tick per frame when debugging so pausing execution doesn't result in more ticks
  60         int max_tick = 1;
  61 #endif
  62         while (remain >= FrameMS() && max_tick > 0) {
  63                 Tick();
  64                 --max_tick;
  65         }
  66 }
  67
  68 void MasterState::Tick() {
  69         constexpr double dt = 0.01666666666666666666666666666666;
  70         if (!paused) {
  71                 sim.Tick(dt);
  72         }
  73         remain -= FrameMS();
  74         thirds = (thirds + 1) % 3;
  75
  76         double cam_diff = cam_tgt_dist - cam_dist;
  77         if (std::abs(cam_diff) > 0.001) {
  78                 cam_dist += cam_diff * 0.25;
  79         } else {
  80                 cam_dist = cam_tgt_dist;
  81         }
  82 }
  83
  84 int MasterState::FrameMS() const noexcept {
  85         return thirds == 0 ? 16 : 17;
  86 }
  87
  88
  89 void MasterState::OnKeyDown(const SDL_KeyboardEvent &e) {
  90         if (e.keysym.sym == SDLK_p) {
  91                 paused = !paused;
  92         }
  93 }
  94
  95 void MasterState::OnMouseDown(const SDL_MouseButtonEvent &e) {
  96         if (e.button == SDL_BUTTON_RIGHT && cp.Shown()) {
  97                 SDL_SetRelativeMouseMode(SDL_TRUE);
  98                 cam_dragging = true;
  99         }
 100 }
 101
 102 void MasterState::OnMouseUp(const SDL_MouseButtonEvent &e) {
 103         if (e.button == SDL_BUTTON_LEFT) {
 104                 glm::dmat4 inverse(glm::inverse(cam.Projection() * cam.View()));
 105                 math::Ray ray(inverse * App().GetViewport().ShootPixel(e.x, e.y));
 106                 creature::Creature *closest = nullptr;
 107                 double closest_dist = 1.0e24;
 108                 for (creature::Creature *c : sim.LiveCreatures()) {
 109                         glm::dvec3 normal(0.0);
 110                         double dist = 0.0;
 111                         if (Intersect(ray, c->CollisionBox(), glm::dmat4(cam.Model(c->GetSituation().GetPlanet())) * c->CollisionTransform(), normal, dist)
 112                                 && dist < closest_dist) {
 113                                 closest = c;
 114                                 closest_dist = dist;
 115                         }
 116                 }
 117                 if (closest) {
 118                         cp.Show(*closest);
 119                 } else {
 120                         cp.Hide();
 121                 }
 122         } else if (e.button == SDL_BUTTON_RIGHT) {
 123                 SDL_SetRelativeMouseMode(SDL_FALSE);
 124                 cam_dragging = false;
 125         }
 126 }
 127
 128 void MasterState::OnMouseMotion(const SDL_MouseMotionEvent &e) {
 129         constexpr double pitch_scale = PI * 0.001;
 130         constexpr double yaw_scale = PI * 0.002;
 131         if (cam_dragging) {
 132                 cam_orient.x = glm::clamp(cam_orient.x + double(e.yrel) * pitch_scale, 0.0, PI * 0.499);
 133                 cam_orient.y = std::fmod(cam_orient.y + double(e.xrel) * yaw_scale, PI * 2.0);
 134         }
 135 }
 136
 137 void MasterState::OnMouseWheel(const SDL_MouseWheelEvent &e) {
 138         constexpr double roll_scale = PI * 0.0625;
 139         constexpr double zoom_scale = -1.0;
 140         constexpr double zoom_base = 1.125;
 141         cam_orient.z = glm::clamp(cam_orient.z + double(e.x) * roll_scale, PI * -0.5, PI * 0.5);
 142         cam_tgt_dist = std::max(cp.GetCreature().Size() * 2.0, cam_tgt_dist * std::pow(zoom_base, double(e.y) * zoom_scale));
 143 }
 144
 145 void MasterState::OnRender(graphics::Viewport &viewport) {
 146         if (cp.Shown()) {
 147                 cam.Radial(cp.GetCreature(), cam_dist, cam_orient);
 148                 assets.shaders.planet_surface.Activate();
 149                 assets.shaders.planet_surface.SetV(cam.View());
 150                 assets.shaders.sun_surface.Activate();
 151                 assets.shaders.sun_surface.SetV(cam.View());
 152                 assets.shaders.creature_skin.Activate();
 153                 assets.shaders.creature_skin.SetV(cam.View());
 154         }
 155
 156         int num_lights = 0;
 157         for (auto sun : sim.Suns()) {
 158                 // TODO: source sun's light color and strength
 159                 glm::vec3 pos(cam.View() * cam.Model(*sun)[3]);
 160                 glm::vec3 col(1.0f, 1.0f, 1.0f);
 161                 float str = 1.0e6f;
 162                 assets.shaders.planet_surface.Activate();
 163                 assets.shaders.planet_surface.SetLight(num_lights, pos, col, str);
 164                 assets.shaders.creature_skin.Activate();
 165                 assets.shaders.creature_skin.SetLight(num_lights, pos, col, str);
 166                 ++num_lights;
 167                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 168                         break;
 169                 }
 170         }
 171         for (auto planet : sim.Planets()) {
 172                 // TODO: indirect light from planets, calculate strength and get color somehow
 173                 glm::vec3 pos(cam.View() * cam.Model(*planet)[3]);
 174                 glm::vec3 col(1.0f, 1.0f, 1.0f);
 175                 float str = 10.0f;
 176                 assets.shaders.planet_surface.Activate();
 177                 assets.shaders.planet_surface.SetLight(num_lights, pos, col, str);
 178                 assets.shaders.creature_skin.Activate();
 179                 assets.shaders.creature_skin.SetLight(num_lights, pos, col, str);
 180                 ++num_lights;
 181                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 182                         break;
 183                 }
 184         }
 185         assets.shaders.planet_surface.Activate();
 186         assets.shaders.planet_surface.SetNumLights(num_lights);
 187         assets.shaders.creature_skin.Activate();
 188         assets.shaders.creature_skin.SetNumLights(num_lights);
 189
 190         assets.shaders.planet_surface.Activate();
 191         assets.shaders.planet_surface.SetTexture(assets.textures.tiles);
 192         for (auto planet : sim.Planets()) {
 193                 assets.shaders.planet_surface.SetM(cam.Model(*planet));
 194                 planet->Draw(assets, viewport);
 195         }
 196
 197         assets.shaders.sun_surface.Activate();
 198         for (auto sun : sim.Suns()) {
 199                 double sun_radius = sun->Radius();
 200                 assets.shaders.sun_surface.SetM(
 201                         cam.Model(*sun) * glm::scale(glm::vec3(sun_radius, sun_radius, sun_radius)));
 202                 assets.shaders.sun_surface.SetLight(glm::vec3(1.0f, 1.0f, 1.0f), 1.0e6f);
 203                 assets.shaders.sun_surface.Draw();
 204         }
 205
 206         assets.shaders.creature_skin.Activate();
 207         assets.shaders.creature_skin.SetTexture(assets.textures.skins);
 208         // TODO: extend to nearby bodies as well
 209         for (auto c : cam.Reference().Creatures()) {
 210                 assets.shaders.creature_skin.SetM(cam.Model(cam.Reference()) * glm::mat4(c->LocalTransform()));
 211                 assets.shaders.creature_skin.SetBaseColor(glm::vec3(c->BaseColor()));
 212                 assets.shaders.creature_skin.SetHighlightColor(glm::vec4(c->HighlightColor()));
 213                 c->Draw(viewport);
 214         }
 215
 216         viewport.ClearDepth();
 217         cp.Draw(viewport);
 218         rp.Draw(viewport);
 219         tp.Draw(viewport);
 220 }
 221
 222 }
 223 }