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#include <algorithm>
#include <cassert>
#include <cmath>
#include <functional>
#include <stdexcept>
#include <vector>
#include "../api/Camera.h"
#include "../api/ParticleEmitter.h"
#include "../api/Sprite.h"
#include "../api/Transform.h"
#include "../facade/SDLContext.h"
#include "../manager/ComponentManager.h"
#include "RenderSystem.h"
using namespace crepe;
using namespace std;
void RenderSystem::clear_screen() {
SDLContext & ctx = this->mediator.sdl_context;
ctx.clear_screen();
}
void RenderSystem::present_screen() {
SDLContext & ctx = this->mediator.sdl_context;
ctx.present_screen();
}
SDLContext::CameraValues RenderSystem::update_camera() {
ComponentManager & mgr = this->mediator.component_manager;
SDLContext & ctx = this->mediator.sdl_context;
RefVector<Camera> cameras = mgr.get_components_by_type<Camera>();
if (cameras.size() == 0) throw std::runtime_error("No cameras in current scene");
for (Camera & cam : cameras) {
if (!cam.active) continue;
const Transform & transform
= mgr.get_components_by_id<Transform>(cam.game_object_id).front().get();
SDLContext::CameraValues cam_val = ctx.set_camera(cam);
cam_val.cam_pos = transform.position + cam.data.postion_offset;
return cam_val;
}
throw std::runtime_error("No active cameras in current scene");
}
bool sorting_comparison(const Sprite & a, const Sprite & b) {
if (a.data.sorting_in_layer != b.data.sorting_in_layer)
return a.data.sorting_in_layer < b.data.sorting_in_layer;
if (a.data.order_in_layer != b.data.order_in_layer)
return a.data.order_in_layer < b.data.order_in_layer;
return false;
}
RefVector<Sprite> RenderSystem::sort(RefVector<Sprite> & objs) const {
RefVector<Sprite> sorted_objs(objs);
std::sort(sorted_objs.begin(), sorted_objs.end(), sorting_comparison);
return sorted_objs;
}
void RenderSystem::frame_update() {
this->clear_screen();
this->render();
this->present_screen();
}
bool RenderSystem::render_particle(const Sprite & sprite, const SDLContext::CameraValues & cam,
const double & scale) {
ComponentManager & mgr = this->mediator.component_manager;
SDLContext & ctx = this->mediator.sdl_context;
vector<reference_wrapper<ParticleEmitter>> emitters
= mgr.get_components_by_id<ParticleEmitter>(sprite.game_object_id);
bool rendering_particles = false;
for (const ParticleEmitter & em : emitters) {
if (&em.data.sprite != &sprite) continue;
rendering_particles = true;
if (!em.active) continue;
for (const Particle & p : em.data.particles) {
if (!p.active) continue;
ctx.draw(SDLContext::RenderContext{
.sprite = sprite,
.cam = cam,
.pos = p.position,
.angle = p.angle,
.scale = scale,
});
}
}
return rendering_particles;
}
void RenderSystem::render_normal(const Sprite & sprite, const SDLContext::CameraValues & cam,
const Transform & tm) {
SDLContext & ctx = this->mediator.sdl_context;
ctx.draw(SDLContext::RenderContext{
.sprite = sprite,
.cam = cam,
.pos = tm.position,
.angle = tm.rotation,
.scale = tm.scale,
});
}
void RenderSystem::render() {
ComponentManager & mgr = this->mediator.component_manager;
const SDLContext::CameraValues & cam = this->update_camera();
RefVector<Sprite> sprites = mgr.get_components_by_type<Sprite>();
RefVector<Sprite> sorted_sprites = this->sort(sprites);
for (const Sprite & sprite : sorted_sprites) {
if (!sprite.active) continue;
const Transform & transform
= mgr.get_components_by_id<Transform>(sprite.game_object_id).front().get();
bool rendered_particles = this->render_particle(sprite, cam, transform.scale);
if (rendered_particles) continue;
this->render_normal(sprite, cam, transform);
}
}
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