#include "qmapboxgl_renderer_frontend_p.hpp"

#include <mbgl/renderer/backend_scope.hpp>
#include <mbgl/renderer/renderer.hpp>

QMapboxGLRendererFrontend::QMapboxGLRendererFrontend(std::unique_ptr<mbgl::Renderer> renderer_, mbgl::RendererBackend& backend_, mbgl::View& view_)
    : renderer(std::move(renderer_))
    , backend(backend_)
    , view(view_) {
}

QMapboxGLRendererFrontend::~QMapboxGLRendererFrontend() = default;

void QMapboxGLRendererFrontend::reset() {
    if (renderer) {
        renderer.reset();
    }
}

void QMapboxGLRendererFrontend::update(std::shared_ptr<mbgl::UpdateParameters> updateParameters_) {
    updateParameters = updateParameters_;
    emit updated();
}

void QMapboxGLRendererFrontend::setObserver(mbgl::RendererObserver& observer_) {
    if (!renderer) return;
    
    renderer->setObserver(&observer_);
}

void QMapboxGLRendererFrontend::render() {
    if (!renderer || !updateParameters) return;
    
    // The OpenGL implementation automatically enables the OpenGL context for us.
    mbgl::BackendScope scope { backend, mbgl::BackendScope::ScopeType::Implicit };
    
    renderer->render(view, *updateParameters);
}