src/app/states.cpp

   1 #include "MasterState.hpp"
   2
   3 #include "../creature/Creature.hpp"
   4 #include "../graphics/Viewport.hpp"
   5 #include "../math/const.hpp"
   6 #include "../world/Body.hpp"
   7 #include "../world/Planet.hpp"
   8 #include "../world/Simulation.hpp"
   9 #include "../world/Sun.hpp"
  10
  11 #include <glm/gtx/transform.hpp>
  12
  13
  14 namespace blobs {
  15 namespace app {
  16
  17 MasterState::MasterState(Assets &assets, world::Simulation &sim) noexcept
  18 : State()
  19 , assets(assets)
  20 , sim(sim)
  21 , cam(sim.Root())
  22 , cam_dist(10.0)
  23 , cam_tgt_dist(10.0)
  24 , cam_orient(PI * 0.125, 0.0, 0.0)
  25 , cam_dragging(false)
  26 , cp(assets)
  27 , remain(0)
  28 , thirds(0)
  29 , paused(false) {
  30 }
  31
  32 MasterState::~MasterState() noexcept {
  33 }
  34
  35
  36 void MasterState::OnResize(int w, int h) {
  37         assets.shaders.canvas.Activate();
  38         assets.shaders.canvas.Resize(float(w), float(h));
  39         assets.shaders.alpha_sprite.Activate();
  40         assets.shaders.alpha_sprite.SetVP(glm::mat4(1.0f), glm::ortho(0.0f, float(w), float(h), 0.0f, 1.0e4f, -1.0e4f));
  41
  42         cam.Aspect(float(w), float(h));
  43         assets.shaders.planet_surface.Activate();
  44         assets.shaders.planet_surface.SetVP(cam.View(), cam.Projection());
  45         assets.shaders.sun_surface.Activate();
  46         assets.shaders.sun_surface.SetVP(cam.View(), cam.Projection());
  47         assets.shaders.creature_skin.Activate();
  48         assets.shaders.creature_skin.SetVP(cam.View(), cam.Projection());
  49 }
  50
  51 void MasterState::OnUpdate(int dt) {
  52         remain += dt;
  53         while (remain >= FrameMS()) {
  54                 Tick();
  55         }
  56 }
  57
  58 void MasterState::Tick() {
  59         constexpr double dt = 0.01666666666666666666666666666666;
  60         if (!paused) {
  61                 sim.Tick(dt);
  62         }
  63         remain -= FrameMS();
  64         thirds = (thirds + 1) % 3;
  65
  66         double cam_diff = cam_tgt_dist - cam_dist;
  67         if (std::abs(cam_diff) > 0.001) {
  68                 cam_dist += cam_diff * 0.25;
  69         } else {
  70                 cam_dist = cam_tgt_dist;
  71         }
  72 }
  73
  74 int MasterState::FrameMS() const noexcept {
  75         return thirds == 0 ? 16 : 17;
  76 }
  77
  78
  79 void MasterState::OnKeyDown(const SDL_KeyboardEvent &e) {
  80         if (e.keysym.sym == SDLK_p) {
  81                 paused = !paused;
  82         }
  83 }
  84
  85 void MasterState::OnMouseDown(const SDL_MouseButtonEvent &e) {
  86         if (e.button == SDL_BUTTON_RIGHT) {
  87                 SDL_SetRelativeMouseMode(SDL_TRUE);
  88                 cam_dragging = true;
  89         }
  90 }
  91
  92 void MasterState::OnMouseUp(const SDL_MouseButtonEvent &e) {
  93         if (e.button == SDL_BUTTON_RIGHT) {
  94                 SDL_SetRelativeMouseMode(SDL_FALSE);
  95                 cam_dragging = false;
  96         }
  97 }
  98
  99 void MasterState::OnMouseMotion(const SDL_MouseMotionEvent &e) {
 100         constexpr double pitch_scale = PI * 0.001;
 101         constexpr double yaw_scale = PI * 0.002;
 102         if (cam_dragging) {
 103                 cam_orient.x = glm::clamp(cam_orient.x + double(e.yrel) * pitch_scale, 0.0, PI * 0.5);
 104                 cam_orient.y = std::fmod(cam_orient.y + double(e.xrel) * yaw_scale, PI * 2.0);
 105         }
 106 }
 107
 108 void MasterState::OnMouseWheel(const SDL_MouseWheelEvent &e) {
 109         constexpr double roll_scale = PI * 0.0625;
 110         constexpr double zoom_scale = -1.0;
 111         constexpr double zoom_base = 1.125;
 112         cam_orient.z = glm::clamp(cam_orient.z + double(e.x) * roll_scale, PI * -0.5, PI * 0.5);
 113         cam_tgt_dist = std::max(1.0, cam_tgt_dist * std::pow(zoom_base, double(e.y) * zoom_scale));
 114 }
 115
 116 void MasterState::OnRender(graphics::Viewport &viewport) {
 117         if (cp.Shown()) {
 118                 cam.Radial(cp.GetCreature(), cam_dist, cam_orient);
 119                 assets.shaders.planet_surface.Activate();
 120                 assets.shaders.planet_surface.SetV(cam.View());
 121                 assets.shaders.sun_surface.Activate();
 122                 assets.shaders.sun_surface.SetV(cam.View());
 123                 assets.shaders.creature_skin.Activate();
 124                 assets.shaders.creature_skin.SetV(cam.View());
 125         }
 126
 127         int num_lights = 0;
 128         for (auto sun : sim.Suns()) {
 129                 // TODO: source sun's light color and strength
 130                 glm::vec3 pos(cam.View() * cam.Model(*sun)[3]);
 131                 glm::vec3 col(1.0f, 1.0f, 1.0f);
 132                 float str = 1.0e6f;
 133                 assets.shaders.planet_surface.Activate();
 134                 assets.shaders.planet_surface.SetLight(num_lights, pos, col, str);
 135                 assets.shaders.creature_skin.Activate();
 136                 assets.shaders.creature_skin.SetLight(num_lights, pos, col, str);
 137                 ++num_lights;
 138                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 139                         break;
 140                 }
 141         }
 142         for (auto planet : sim.Planets()) {
 143                 // TODO: indirect light from planets, calculate strength and get color somehow
 144                 glm::vec3 pos(cam.View() * cam.Model(*planet)[3]);
 145                 glm::vec3 col(1.0f, 1.0f, 1.0f);
 146                 float str = 10.0f;
 147                 assets.shaders.planet_surface.Activate();
 148                 assets.shaders.planet_surface.SetLight(num_lights, pos, col, str);
 149                 assets.shaders.creature_skin.Activate();
 150                 assets.shaders.creature_skin.SetLight(num_lights, pos, col, str);
 151                 ++num_lights;
 152                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 153                         break;
 154                 }
 155         }
 156         assets.shaders.planet_surface.Activate();
 157         assets.shaders.planet_surface.SetNumLights(num_lights);
 158         assets.shaders.creature_skin.Activate();
 159         assets.shaders.creature_skin.SetNumLights(num_lights);
 160
 161         assets.shaders.planet_surface.Activate();
 162         assets.shaders.planet_surface.SetTexture(assets.textures.tiles);
 163         for (auto planet : sim.Planets()) {
 164                 assets.shaders.planet_surface.SetM(cam.Model(*planet));
 165                 planet->Draw(assets, viewport);
 166         }
 167
 168         assets.shaders.sun_surface.Activate();
 169         for (auto sun : sim.Suns()) {
 170                 double sun_radius = sun->Radius();
 171                 assets.shaders.sun_surface.SetM(
 172                         cam.Model(*sun) * glm::scale(glm::vec3(sun_radius, sun_radius, sun_radius)));
 173                 assets.shaders.sun_surface.SetLight(glm::vec3(1.0f, 1.0f, 1.0f), 1.0e6f);
 174                 assets.shaders.sun_surface.Draw();
 175         }
 176
 177         assets.shaders.creature_skin.Activate();
 178         assets.shaders.creature_skin.SetTexture(assets.textures.skins);
 179         // TODO: extend to nearby bodies as well
 180         for (auto c : cam.Reference().Creatures()) {
 181                 assets.shaders.creature_skin.SetM(cam.Model(cam.Reference()) * glm::mat4(c->LocalTransform()));
 182                 assets.shaders.creature_skin.SetBaseColor(c->BaseColor());
 183                 assets.shaders.creature_skin.SetHighlightColor(c->HighlightColor());
 184                 c->Draw(viewport);
 185         }
 186
 187         viewport.ClearDepth();
 188         cp.Draw(assets, viewport);
 189 }
 190
 191 }
 192 }