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