#include "gl_view.h"
#include "../app/core/game_engine.h"

#include <QOpenGLFramebufferObject>
#include <QOpenGLFramebufferObjectFormat>
#include <QQuickWindow>

GLView::GLView() { setMirrorVertically(true); }

QQuickFramebufferObject::Renderer *GLView::createRenderer() const {
  return new GLRenderer(m_engine);
}

QObject *GLView::engine() const { return m_engine; }

void GLView::setEngine(QObject *eng) {
  if (m_engine == eng)
    return;
  m_engine = qobject_cast<GameEngine *>(eng);
  emit engineChanged();
  update();
}

GLView::GLRenderer::GLRenderer(QPointer<GameEngine> engine)
    : m_engine(engine) {}

void GLView::GLRenderer::render() {
  if (!m_engine)
    return;
  m_engine->ensureInitialized();
  m_engine->update(1.0f / 60.0f);
  m_engine->render(m_size.width(), m_size.height());
  update();
}

QOpenGLFramebufferObject *
GLView::GLRenderer::createFramebufferObject(const QSize &size) {
  m_size = size;
  QOpenGLFramebufferObjectFormat fmt;
  fmt.setAttachment(QOpenGLFramebufferObject::Depth);
  fmt.setSamples(0);
  return new QOpenGLFramebufferObject(size, fmt);
}

void GLView::GLRenderer::synchronize(QQuickFramebufferObject *item) {
  auto *view = static_cast<GLView *>(item);
  m_engine = qobject_cast<GameEngine *>(view->engine());
}