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         cp.ZIndex(10.0f);
  34         rp.ZIndex(20.0f);
  35         tp.ZIndex(30.0f);
  36 }
  37
  38 MasterState::~MasterState() noexcept {
  39 }
  40
  41
  42 void MasterState::OnResize(int w, int h) {
  43         assets.shaders.canvas.Activate();
  44         assets.shaders.canvas.Resize(float(w), float(h));
  45         assets.shaders.alpha_sprite.Activate();
  46         assets.shaders.alpha_sprite.SetVP(glm::mat4(1.0f), glm::ortho(0.0f, float(w), float(h), 0.0f, 1.0e4f, -1.0e4f));
  47
  48         cam.Aspect(float(w), float(h));
  49         assets.shaders.planet_surface.Activate();
  50         assets.shaders.planet_surface.SetVP(cam.View(), cam.Projection());
  51         assets.shaders.sun_surface.Activate();
  52         assets.shaders.sun_surface.SetVP(cam.View(), cam.Projection());
  53         assets.shaders.creature_skin.Activate();
  54         assets.shaders.creature_skin.SetVP(cam.View(), cam.Projection());
  55 }
  56
  57 void MasterState::OnUpdate(int dt) {
  58         remain += dt;
  59 #ifdef NDEBUG
  60         int max_tick = 10;
  61 #else
  62         // one tick per frame when debugging so pausing execution doesn't result in more ticks
  63         int max_tick = 1;
  64 #endif
  65         while (remain >= FrameMS() && max_tick > 0) {
  66                 Tick();
  67                 --max_tick;
  68         }
  69 }
  70
  71 void MasterState::Tick() {
  72         constexpr double dt = 0.01666666666666666666666666666666;
  73         if (!paused) {
  74                 sim.Tick(dt);
  75         }
  76         remain -= FrameMS();
  77         thirds = (thirds + 1) % 3;
  78
  79         double cam_diff = cam_tgt_dist - cam_dist;
  80         if (std::abs(cam_diff) > 0.001) {
  81                 cam_dist += cam_diff * 0.25;
  82         } else {
  83                 cam_dist = cam_tgt_dist;
  84         }
  85 }
  86
  87 int MasterState::FrameMS() const noexcept {
  88         return thirds == 0 ? 16 : 17;
  89 }
  90
  91
  92 void MasterState::OnKeyDown(const SDL_KeyboardEvent &e) {
  93         if (e.keysym.sym == SDLK_p) {
  94                 paused = !paused;
  95         } else if (e.keysym.sym == SDLK_F1) {
  96                 rp.Toggle();
  97         }
  98 }
  99
 100 void MasterState::OnMouseDown(const SDL_MouseButtonEvent &e) {
 101         if (e.button == SDL_BUTTON_RIGHT) {
 102                 SDL_SetRelativeMouseMode(SDL_TRUE);
 103                 cam_dragging = true;
 104         }
 105 }
 106
 107 void MasterState::OnMouseUp(const SDL_MouseButtonEvent &e) {
 108         if (e.button == SDL_BUTTON_LEFT) {
 109                 glm::dmat4 inverse(glm::inverse(cam.Projection() * cam.View()));
 110                 math::Ray ray(inverse * App().GetViewport().ShootPixel(e.x, e.y));
 111                 creature::Creature *closest = nullptr;
 112                 double closest_dist = 1.0e24;
 113                 for (creature::Creature *c : sim.LiveCreatures()) {
 114                         glm::dvec3 normal(0.0);
 115                         double dist = 0.0;
 116                         if (Intersect(ray, c->CollisionBox(), glm::dmat4(cam.Model(c->GetSituation().GetPlanet())) * c->CollisionTransform(), normal, dist)
 117                                 && dist < closest_dist) {
 118                                 closest = c;
 119                                 closest_dist = dist;
 120                         }
 121                 }
 122                 if (closest) {
 123                         cp.Show(*closest);
 124                 } else {
 125                         cp.Hide();
 126                 }
 127         } else if (e.button == SDL_BUTTON_RIGHT) {
 128                 SDL_SetRelativeMouseMode(SDL_FALSE);
 129                 cam_dragging = false;
 130         }
 131 }
 132
 133 void MasterState::OnMouseMotion(const SDL_MouseMotionEvent &e) {
 134         constexpr double pitch_scale = PI * 0.001;
 135         constexpr double yaw_scale = PI * 0.002;
 136         if (cam_dragging) {
 137                 cam_orient.x = glm::clamp(cam_orient.x + double(e.yrel) * pitch_scale, 0.0, PI * 0.499);
 138                 cam_orient.y = std::fmod(cam_orient.y + double(e.xrel) * yaw_scale, PI * 2.0);
 139         }
 140 }
 141
 142 void MasterState::OnMouseWheel(const SDL_MouseWheelEvent &e) {
 143         constexpr double roll_scale = PI * 0.0625;
 144         constexpr double zoom_scale = -1.0;
 145         constexpr double zoom_base = 1.125;
 146         cam_orient.z = glm::clamp(cam_orient.z + double(e.x) * roll_scale, PI * -0.5, PI * 0.5);
 147         if (cp.Shown()) {
 148                 cam_tgt_dist = std::max(cp.GetCreature().Size() * 2.0, cam_tgt_dist * std::pow(zoom_base, double(e.y) * zoom_scale));
 149         } else {
 150                 cam_tgt_dist = std::max(1.0, cam_tgt_dist * std::pow(zoom_base, double(e.y) * zoom_scale));
 151         }
 152 }
 153
 154 void MasterState::OnRender(graphics::Viewport &viewport) {
 155         if (cp.Shown()) {
 156                 cam.Radial(cp.GetCreature(), cam_dist, cam_orient);
 157                 assets.shaders.planet_surface.Activate();
 158                 assets.shaders.planet_surface.SetV(cam.View());
 159                 assets.shaders.sun_surface.Activate();
 160                 assets.shaders.sun_surface.SetV(cam.View());
 161                 assets.shaders.creature_skin.Activate();
 162                 assets.shaders.creature_skin.SetV(cam.View());
 163         }
 164
 165         int num_lights = 0;
 166         for (auto sun : sim.Suns()) {
 167                 // TODO: source sun's light color and strength
 168                 glm::vec3 pos(cam.View() * cam.Model(*sun)[3]);
 169                 glm::vec3 col(1.0f, 1.0f, 1.0f);
 170                 float str = 1.0e6f;
 171                 assets.shaders.planet_surface.Activate();
 172                 assets.shaders.planet_surface.SetLight(num_lights, pos, col, str);
 173                 assets.shaders.creature_skin.Activate();
 174                 assets.shaders.creature_skin.SetLight(num_lights, pos, col, str);
 175                 ++num_lights;
 176                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 177                         break;
 178                 }
 179         }
 180         for (auto planet : sim.Planets()) {
 181                 // TODO: indirect light from planets, calculate strength and get color somehow
 182                 glm::vec3 pos(cam.View() * cam.Model(*planet)[3]);
 183                 glm::vec3 col(1.0f, 1.0f, 1.0f);
 184                 float str = 10.0f;
 185                 assets.shaders.planet_surface.Activate();
 186                 assets.shaders.planet_surface.SetLight(num_lights, pos, col, str);
 187                 assets.shaders.creature_skin.Activate();
 188                 assets.shaders.creature_skin.SetLight(num_lights, pos, col, str);
 189                 ++num_lights;
 190                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 191                         break;
 192                 }
 193         }
 194         assets.shaders.planet_surface.Activate();
 195         assets.shaders.planet_surface.SetNumLights(num_lights);
 196         assets.shaders.creature_skin.Activate();
 197         assets.shaders.creature_skin.SetNumLights(num_lights);
 198
 199         assets.shaders.planet_surface.Activate();
 200         assets.shaders.planet_surface.SetTexture(assets.textures.tiles);
 201         for (auto planet : sim.Planets()) {
 202                 assets.shaders.planet_surface.SetM(cam.Model(*planet));
 203                 planet->Draw(assets, viewport);
 204         }
 205
 206         assets.shaders.sun_surface.Activate();
 207         for (auto sun : sim.Suns()) {
 208                 double sun_radius = sun->Radius();
 209                 assets.shaders.sun_surface.SetM(
 210                         cam.Model(*sun) * glm::scale(glm::vec3(sun_radius, sun_radius, sun_radius)));
 211                 assets.shaders.sun_surface.SetLight(glm::vec3(1.0f, 1.0f, 1.0f), 1.0e6f);
 212                 assets.shaders.sun_surface.Draw();
 213         }
 214
 215         assets.shaders.creature_skin.Activate();
 216         assets.shaders.creature_skin.SetTexture(assets.textures.skins);
 217         // TODO: extend to nearby bodies as well
 218         for (auto c : cam.Reference().Creatures()) {
 219                 assets.shaders.creature_skin.SetM(cam.Model(cam.Reference()) * glm::mat4(c->LocalTransform()));
 220                 assets.shaders.creature_skin.SetBaseColor(glm::vec3(c->BaseColor()));
 221                 assets.shaders.creature_skin.SetHighlightColor(glm::vec4(c->HighlightColor()));
 222                 c->Draw(viewport);
 223         }
 224
 225         viewport.ClearDepth();
 226         cp.Draw(viewport);
 227         rp.Draw(viewport);
 228         tp.Draw(viewport);
 229 }
 230
 231 }
 232 }