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         declare_dependency<Game::Transform>(READ_FRESH);
  19         declare_dependency<Game::Camera>(READ_FRESH);
  20         declare_dependency<MeshRenderer>(WRITE);
  21
  22         event_observer.observe<Game::Events::EntityCreated>([this](auto &e){ entity_created(e); });
  23         event_observer.observe<Game::Events::EntityDestroyed>([this](auto &e){ entity_destroyed(e); });
  24         event_observer.observe<Game::Events::CameraChanged>([this](auto &e){ camera_changed(e); });
  25
  26         stage.synthesize_initial_events(event_observer);
  27
  28         view.set_camera(&gl_camera);
  29 }
  30
  31 Renderer::~Renderer()
  32 { }
  33
  34 void Renderer::entity_created(const Game::Events::EntityCreated &event)
  35 {
  36         Game::Handle<Game::MeshSource> mesh_source = event.entity->get_component<Game::MeshSource>();
  37         Game::Handle<MeshRenderer> mesh_renderer = event.entity->get_component<MeshRenderer>();
  38         if(mesh_source && !mesh_renderer)
  39         {
  40                 auto i = lower_bound_member(entities, event.entity, &RenderedEntity::entity);
  41                 i = entities.emplace(i, event.entity, Game::Owned<MeshRenderer>(event.entity, mesh_source));
  42                 scene.add(i->mesh_renderer->get_instance());
  43         }
  44 }
  45
  46 void Renderer::entity_destroyed(const Game::Events::EntityDestroyed &event)
  47 {
  48         auto i = lower_bound_member(entities, event.entity, &RenderedEntity::entity);
  49         if(i!=entities.end() && i->entity==event.entity)
  50         {
  51                 scene.remove(i->mesh_renderer->get_instance());
  52                 entities.erase(i);
  53         }
  54 }
  55
  56 void Renderer::camera_changed(const Game::Events::CameraChanged &event)
  57 {
  58         active_camera = event.camera;
  59         if(event.camera)
  60         {
  61                 const string &seq_name = event.camera->get_sequence_name();
  62                 if(seq_name!=current_seq_name)
  63                 {
  64                         current_seq_name = seq_name;
  65                         GL::SequenceBuilder bld(stage.get_resources().get<GL::SequenceTemplate>(seq_name));
  66                         bld.set_renderable("content", scene);
  67                         sequence.reset(bld.build(view));
  68                         view.set_content(sequence.get());
  69                 }
  70         }
  71 }
  72
  73 void Renderer::tick(Time::TimeDelta)
  74 {
  75         if(active_camera)
  76         {
  77                 Game::Handle<Game::Transform> transform = active_camera->get_entity()->get_transform();
  78                 if(transform)
  79                         gl_camera.set_object_matrix(transform->get_world_matrix());
  80                 else
  81                         gl_camera.set_object_matrix(GL::Matrix());
  82                 if(active_camera->is_orthographic())
  83                 {
  84                         const LinAl::Vector<float, 2> &size = active_camera->get_size();
  85                         gl_camera.set_orthographic(size.x, size.y);
  86                 }
  87                 else
  88                         gl_camera.set_field_of_view(active_camera->get_fov_vertical());
  89                 gl_camera.set_depth_clip(active_camera->get_near_clip(), active_camera->get_far_clip());
  90         }
  91
  92         for(const RenderedEntity &e: entities)
  93                 e.mesh_renderer->update_matrix();
  94
  95         view.render();
  96 }
  97
  98 } // namespace Msp::GameView