/*  PCSX2 - PS2 Emulator for PCs
 *  Copyright (C) 2002-2021  PCSX2 Dev Team
 *
 *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU Lesser General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with PCSX2.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#include "common/PrecompiledHeader.h"
#include "common/Console.h"

#include "ContextEGLWayland.h"

#include <dlfcn.h>

namespace GL
{
	static const char* WAYLAND_EGL_MODNAME = "libwayland-egl.so.1";

	ContextEGLWayland::ContextEGLWayland(const WindowInfo& wi)
		: ContextEGL(wi)
	{
	}

	ContextEGLWayland::~ContextEGLWayland()
	{
		if (m_wl_window)
			m_wl_egl_window_destroy(m_wl_window);
		if (m_wl_module)
			dlclose(m_wl_module);
	}

	std::unique_ptr<Context> ContextEGLWayland::Create(const WindowInfo& wi, const Version* versions_to_try,
		size_t num_versions_to_try)
	{
		std::unique_ptr<ContextEGLWayland> context = std::make_unique<ContextEGLWayland>(wi);
		if (!context->LoadModule() || !context->Initialize(versions_to_try, num_versions_to_try))
			return nullptr;

		return context;
	}

	std::unique_ptr<Context> ContextEGLWayland::CreateSharedContext(const WindowInfo& wi)
	{
		std::unique_ptr<ContextEGLWayland> context = std::make_unique<ContextEGLWayland>(wi);
		context->m_display = m_display;

		if (!context->LoadModule() || !context->CreateContextAndSurface(m_version, m_context, false))
			return nullptr;

		return context;
	}

	void ContextEGLWayland::ResizeSurface(u32 new_surface_width, u32 new_surface_height)
	{
		if (m_wl_window)
			m_wl_egl_window_resize(m_wl_window, new_surface_width, new_surface_height, 0, 0);

		ContextEGL::ResizeSurface(new_surface_width, new_surface_height);
	}

	EGLNativeWindowType ContextEGLWayland::GetNativeWindow(EGLConfig config)
	{
		if (m_wl_window)
		{
			m_wl_egl_window_destroy(m_wl_window);
			m_wl_window = nullptr;
		}

		m_wl_window =
			m_wl_egl_window_create(static_cast<wl_surface*>(m_wi.window_handle), m_wi.surface_width, m_wi.surface_height);
		if (!m_wl_window)
			return {};

		return reinterpret_cast<EGLNativeWindowType>(m_wl_window);
	}

	bool ContextEGLWayland::LoadModule()
	{
		m_wl_module = dlopen(WAYLAND_EGL_MODNAME, RTLD_NOW | RTLD_GLOBAL);
		if (!m_wl_module)
		{
			Console.Error("Failed to load %s.", WAYLAND_EGL_MODNAME);
			return false;
		}

		m_wl_egl_window_create = reinterpret_cast<decltype(m_wl_egl_window_create)>(dlsym(m_wl_module, "wl_egl_window_create"));
		m_wl_egl_window_destroy = reinterpret_cast<decltype(m_wl_egl_window_destroy)>(dlsym(m_wl_module, "wl_egl_window_destroy"));
		m_wl_egl_window_resize = reinterpret_cast<decltype(m_wl_egl_window_resize)>(dlsym(m_wl_module, "wl_egl_window_resize"));
		if (!m_wl_egl_window_create || !m_wl_egl_window_destroy || !m_wl_egl_window_resize)
		{
			Console.Error("Failed to load one or more functions from %s.", WAYLAND_EGL_MODNAME);
			return false;
		}

		return true;
	}
} // namespace GL