source/gameview/renderer.cpp

   1 #include "renderer.h"
   2 #include <msp/game/entity.h>
   3 #include <msp/game/meshsource.h>
   4 #include <msp/game/stage.h>
   5 #include <msp/game/transform.h>
   6 #include <msp/gl/sequencebuilder.h>
   7 #include "meshrenderer.h"
   8
   9 using namespace std;
  10
  11 namespace Msp::GameView {
  12
  13 Renderer::Renderer(Game::Stage &s, GL::View &v):
  14         System(s),
  15         view(v),
  16         event_observer(s.get_event_bus())
  17 {
  18         event_observer.observe<Game::Events::EntityCreated>([this](auto &e){ entity_created(e); });
  19         event_observer.observe<Game::Events::EntityDestroyed>([this](auto &e){ entity_destroyed(e); });
  20         event_observer.observe<Game::Events::CameraChanged>([this](auto &e){ camera_changed(e); });
  21
  22         stage.iterate_objects<Game::Entity>([this](auto &e){ entity_created({ Game::Handle<Game::Entity>::from_object(&e) }); });
  23         if(Game::Handle<Game::Camera> ac = stage.get_active_camera())
  24                 camera_changed({ ac });
  25
  26         view.set_camera(&gl_camera);
  27 }
  28
  29 Renderer::~Renderer()
  30 { }
  31
  32 void Renderer::entity_created(const Game::Events::EntityCreated &event)
  33 {
  34         Game::Handle<Game::MeshSource> mesh_source = event.entity->get_component<Game::MeshSource>();
  35         Game::Handle<MeshRenderer> mesh_renderer = event.entity->get_component<MeshRenderer>();
  36         if(mesh_source && !mesh_renderer)
  37         {
  38                 auto i = lower_bound_member(entities, event.entity, &RenderedEntity::entity);
  39                 i = entities.emplace(i, event.entity, Game::Owned<MeshRenderer>(event.entity, mesh_source));
  40                 scene.add(i->mesh_renderer->get_instance());
  41         }
  42 }
  43
  44 void Renderer::entity_destroyed(const Game::Events::EntityDestroyed &event)
  45 {
  46         auto i = lower_bound_member(entities, event.entity, &RenderedEntity::entity);
  47         if(i!=entities.end() && i->entity==event.entity)
  48         {
  49                 scene.remove(i->mesh_renderer->get_instance());
  50                 entities.erase(i);
  51         }
  52 }
  53
  54 void Renderer::camera_changed(const Game::Events::CameraChanged &event)
  55 {
  56         active_camera = event.camera;
  57         if(event.camera)
  58         {
  59                 const string &seq_name = event.camera->get_sequence_name();
  60                 if(seq_name!=current_seq_name)
  61                 {
  62                         current_seq_name = seq_name;
  63                         GL::SequenceBuilder bld(stage.get_resources().get<GL::SequenceTemplate>(seq_name));
  64                         bld.set_renderable("content", scene);
  65                         sequence.reset(bld.build(view));
  66                         view.set_content(sequence.get());
  67                 }
  68         }
  69 }
  70
  71 void Renderer::tick(Time::TimeDelta)
  72 {
  73         if(active_camera)
  74         {
  75                 Game::Handle<Game::Transform> transform = active_camera->get_entity()->get_transform();
  76                 if(transform)
  77                         gl_camera.set_object_matrix(transform->get_world_matrix());
  78                 else
  79                         gl_camera.set_object_matrix(GL::Matrix());
  80                 if(active_camera->is_orthographic())
  81                 {
  82                         const LinAl::Vector<float, 2> &size = active_camera->get_size();
  83                         gl_camera.set_orthographic(size.x, size.y);
  84                 }
  85                 else
  86                         gl_camera.set_field_of_view(active_camera->get_fov_vertical());
  87                 gl_camera.set_depth_clip(active_camera->get_near_clip(), active_camera->get_far_clip());
  88         }
  89
  90         for(const RenderedEntity &e: entities)
  91                 e.mesh_renderer->update_matrix();
  92
  93         view.render();
  94 }
  95
  96 } // namespace Msp::GameView