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(5.0)
  23 , cam_tgt_dist(5.0)
  24 , cam_orient(PI * 0.375, PI * 0.25, 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 #ifdef NDEBUG
  54         int max_tick = 10;
  55 #else
  56         // one tick per frame when debugging so pausing execution doesn't result in more ticks
  57         int max_tick = 1;
  58 #endif
  59         while (remain >= FrameMS() && max_tick > 0) {
  60                 Tick();
  61                 --max_tick;
  62         }
  63 }
  64
  65 void MasterState::Tick() {
  66         constexpr double dt = 0.01666666666666666666666666666666;
  67         if (!paused) {
  68                 sim.Tick(dt);
  69         }
  70         remain -= FrameMS();
  71         thirds = (thirds + 1) % 3;
  72
  73         double cam_diff = cam_tgt_dist - cam_dist;
  74         if (std::abs(cam_diff) > 0.001) {
  75                 cam_dist += cam_diff * 0.25;
  76         } else {
  77                 cam_dist = cam_tgt_dist;
  78         }
  79 }
  80
  81 int MasterState::FrameMS() const noexcept {
  82         return thirds == 0 ? 16 : 17;
  83 }
  84
  85
  86 void MasterState::OnKeyDown(const SDL_KeyboardEvent &e) {
  87         if (e.keysym.sym == SDLK_p) {
  88                 paused = !paused;
  89         }
  90 }
  91
  92 void MasterState::OnMouseDown(const SDL_MouseButtonEvent &e) {
  93         if (e.button == SDL_BUTTON_RIGHT) {
  94                 SDL_SetRelativeMouseMode(SDL_TRUE);
  95                 cam_dragging = true;
  96         }
  97 }
  98
  99 void MasterState::OnMouseUp(const SDL_MouseButtonEvent &e) {
 100         if (e.button == SDL_BUTTON_RIGHT) {
 101                 SDL_SetRelativeMouseMode(SDL_FALSE);
 102                 cam_dragging = false;
 103         }
 104 }
 105
 106 void MasterState::OnMouseMotion(const SDL_MouseMotionEvent &e) {
 107         constexpr double pitch_scale = PI * 0.001;
 108         constexpr double yaw_scale = PI * 0.002;
 109         if (cam_dragging) {
 110                 cam_orient.x = glm::clamp(cam_orient.x + double(e.yrel) * pitch_scale, 0.0, PI * 0.5);
 111                 cam_orient.y = std::fmod(cam_orient.y + double(e.xrel) * yaw_scale, PI * 2.0);
 112         }
 113 }
 114
 115 void MasterState::OnMouseWheel(const SDL_MouseWheelEvent &e) {
 116         constexpr double roll_scale = PI * 0.0625;
 117         constexpr double zoom_scale = -1.0;
 118         constexpr double zoom_base = 1.125;
 119         cam_orient.z = glm::clamp(cam_orient.z + double(e.x) * roll_scale, PI * -0.5, PI * 0.5);
 120         cam_tgt_dist = std::max(cp.GetCreature().Size() * 2.0, cam_tgt_dist * std::pow(zoom_base, double(e.y) * zoom_scale));
 121 }
 122
 123 void MasterState::OnRender(graphics::Viewport &viewport) {
 124         if (cp.Shown()) {
 125                 cam.Radial(cp.GetCreature(), cam_dist, cam_orient);
 126                 assets.shaders.planet_surface.Activate();
 127                 assets.shaders.planet_surface.SetV(cam.View());
 128                 assets.shaders.sun_surface.Activate();
 129                 assets.shaders.sun_surface.SetV(cam.View());
 130                 assets.shaders.creature_skin.Activate();
 131                 assets.shaders.creature_skin.SetV(cam.View());
 132         }
 133
 134         int num_lights = 0;
 135         for (auto sun : sim.Suns()) {
 136                 // TODO: source sun's light color and strength
 137                 glm::vec3 pos(cam.View() * cam.Model(*sun)[3]);
 138                 glm::vec3 col(1.0f, 1.0f, 1.0f);
 139                 float str = 1.0e6f;
 140                 assets.shaders.planet_surface.Activate();
 141                 assets.shaders.planet_surface.SetLight(num_lights, pos, col, str);
 142                 assets.shaders.creature_skin.Activate();
 143                 assets.shaders.creature_skin.SetLight(num_lights, pos, col, str);
 144                 ++num_lights;
 145                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 146                         break;
 147                 }
 148         }
 149         for (auto planet : sim.Planets()) {
 150                 // TODO: indirect light from planets, calculate strength and get color somehow
 151                 glm::vec3 pos(cam.View() * cam.Model(*planet)[3]);
 152                 glm::vec3 col(1.0f, 1.0f, 1.0f);
 153                 float str = 10.0f;
 154                 assets.shaders.planet_surface.Activate();
 155                 assets.shaders.planet_surface.SetLight(num_lights, pos, col, str);
 156                 assets.shaders.creature_skin.Activate();
 157                 assets.shaders.creature_skin.SetLight(num_lights, pos, col, str);
 158                 ++num_lights;
 159                 if (num_lights >= graphics::PlanetSurface::MAX_LIGHTS || num_lights >= graphics::CreatureSkin::MAX_LIGHTS) {
 160                         break;
 161                 }
 162         }
 163         assets.shaders.planet_surface.Activate();
 164         assets.shaders.planet_surface.SetNumLights(num_lights);
 165         assets.shaders.creature_skin.Activate();
 166         assets.shaders.creature_skin.SetNumLights(num_lights);
 167
 168         assets.shaders.planet_surface.Activate();
 169         assets.shaders.planet_surface.SetTexture(assets.textures.tiles);
 170         for (auto planet : sim.Planets()) {
 171                 assets.shaders.planet_surface.SetM(cam.Model(*planet));
 172                 planet->Draw(assets, viewport);
 173         }
 174
 175         assets.shaders.sun_surface.Activate();
 176         for (auto sun : sim.Suns()) {
 177                 double sun_radius = sun->Radius();
 178                 assets.shaders.sun_surface.SetM(
 179                         cam.Model(*sun) * glm::scale(glm::vec3(sun_radius, sun_radius, sun_radius)));
 180                 assets.shaders.sun_surface.SetLight(glm::vec3(1.0f, 1.0f, 1.0f), 1.0e6f);
 181                 assets.shaders.sun_surface.Draw();
 182         }
 183
 184         assets.shaders.creature_skin.Activate();
 185         assets.shaders.creature_skin.SetTexture(assets.textures.skins);
 186         // TODO: extend to nearby bodies as well
 187         for (auto c : cam.Reference().Creatures()) {
 188                 assets.shaders.creature_skin.SetM(cam.Model(cam.Reference()) * glm::mat4(c->LocalTransform()));
 189                 assets.shaders.creature_skin.SetBaseColor(c->BaseColor());
 190                 assets.shaders.creature_skin.SetHighlightColor(c->HighlightColor());
 191                 c->Draw(viewport);
 192         }
 193
 194         viewport.ClearDepth();
 195         cp.Draw(assets, viewport);
 196 }
 197
 198 }
 199 }