src/imagefilters.h


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/*
Copyright (C) 2015 Aaron Suen <warr1024@gmail.com>

This program 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 Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#pragma once

#include "irrlichttypes_extrabloated.h"

/* Fill in RGB values for transparent pixels, to correct for odd colors
 * appearing at borders when blending.  This is because many PNG optimizers
 * like to discard RGB values of transparent pixels, but when blending then
 * with non-transparent neighbors, their RGB values will shpw up nonetheless.
 *
 * This function modifies the original image in-place.
 *
 * Parameter "threshold" is the alpha level below which pixels are considered
 * transparent.  Should be 127 for 3d where alpha is threshold, but 0 for
 * 2d where alpha is blended.
 */
void imageCleanTransparent(video::IImage *src, u32 threshold);

/* Scale a region of an image into another image, using nearest-neighbor with
 * anti-aliasing; treat pixels as crisp rectangles, but blend them at boundaries
 * to prevent non-integer scaling ratio artifacts.  Note that this may cause
 * some blending at the edges where pixels don't line up perfectly, but this
 * filter is designed to produce the most accurate results for both upscaling
 * and downscaling.
 */
void imageScaleNNAA(video::IImage *src, const core::rect<s32> &srcrect, video::IImage *dest);
/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>

This program 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 Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <IrrlichtDevice.h>
#include <irrlicht.h>
#include "fontengine.h"
#include "client.h"
#include "clouds.h"
#include "util/numeric.h"
#include "guiscalingfilter.h"
#include "hud.h"
#include "localplayer.h"
#include "camera.h"
#include "minimap.h"
#include "clientmap.h"
#include "renderingengine.h"
#include "render/core.h"
#include "render/factory.h"
#include "inputhandler.h"
#include "gettext.h"

#if !defined(_WIN32) && !defined(__APPLE__) && !defined(__ANDROID__) && \
		!defined(SERVER) && !defined(__HAIKU__)
#define XORG_USED
#endif
#ifdef XORG_USED
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#endif

RenderingEngine *RenderingEngine::s_singleton = nullptr;

RenderingEngine::RenderingEngine(IEventReceiver *receiver)
{
	sanity_check(!s_singleton);

	// Resolution selection
	bool fullscreen = g_settings->getBool("fullscreen");
	u16 screen_w = g_settings->getU16("screen_w");
	u16 screen_h = g_settings->getU16("screen_h");

	// bpp, fsaa, vsync
	bool vsync = g_settings->getBool("vsync");
	u16 bits = g_settings->getU16("fullscreen_bpp");
	u16 fsaa = g_settings->getU16("fsaa");

	// stereo buffer required for pageflip stereo
	bool stereo_buffer = g_settings->get("3d_mode") == "pageflip";

	// Determine driver
	video::E_DRIVER_TYPE driverType = video::EDT_OPENGL;
	const std::string &driverstring = g_settings->get("video_driver");
	std::vector<video::E_DRIVER_TYPE> drivers =
			RenderingEngine::getSupportedVideoDrivers();
	u32 i;
	for (i = 0; i != drivers.size(); i++) {
		if (!strcasecmp(driverstring.c_str(),
				    RenderingEngine::getVideoDriverName(drivers[i]))) {
			driverType = drivers[i];
			break;
		}
	}
	if (i == drivers.size()) {
		errorstream << "Invalid video_driver specified; "
			       "defaulting to opengl"
			    << std::endl;
	}

	SIrrlichtCreationParameters params = SIrrlichtCreationParameters();
	params.DriverType = driverType;
	params.WindowSize = core::dimension2d<u32>(screen_w, screen_h);
	params.Bits = bits;
	params.AntiAlias = fsaa;
	params.Fullscreen = fullscreen;
	params.Stencilbuffer = false;
	params.Stereobuffer = stereo_buffer;
	params.Vsync = vsync;
	params.EventReceiver = receiver;
	params.HighPrecisionFPU = g_settings->getBool("high_precision_fpu");
	params.ZBufferBits = 24;
#ifdef __ANDROID__
	// clang-format off
	params.PrivateData = porting::app_global;
	params.OGLES2ShaderPath = std::string(porting::path_user + DIR_DELIM + "media" +
		DIR_DELIM + "Shaders" + DIR_DELIM).c_str();
	// clang-format on
#endif

	m_device = createDeviceEx(params);
	driver = m_device->getVideoDriver();

	s_singleton = this;
}

RenderingEngine::~RenderingEngine()
{
	core.reset();
	m_device->drop();
	s_singleton = nullptr;
}

v2u32 RenderingEngine::getWindowSize() const
{
	if (core)
		return core->getVirtualSize();
	return m_device->getVideoDriver()->getScreenSize();
}

void RenderingEngine::setResizable(bool resize)
{
	m_device->setResizable(resize);
}

bool RenderingEngine::print_video_modes()
{
	IrrlichtDevice *nulldevice;

	bool vsync = g_settings->getBool("vsync");
	u16 fsaa = g_settings->getU16("fsaa");
	MyEventReceiver *receiver = new MyEventReceiver();

	SIrrlichtCreationParameters params = SIrrlichtCreationParameters();
	params.DriverType = video::EDT_NULL;
	params.WindowSize = core::dimension2d<u32>(640, 480);
	params.Bits = 24;
	params.AntiAlias = fsaa;
	params.Fullscreen = false;
	params.Stencilbuffer = false;
	params.Vsync = vsync;
	params.EventReceiver = receiver;
	params.HighPrecisionFPU = g_settings->getBool("high_precision_fpu");

	nulldevice = createDeviceEx(params);

	if (!nulldevice) {
		delete receiver;
		return false;
	}

	std::cout << _("Available video modes (WxHxD):") << std::endl;

	video::IVideoModeList *videomode_list = nulldevice->getVideoModeList();

	if (videomode_list != NULL) {
		s32 videomode_count = videomode_list->getVideoModeCount();
		core::dimension2d<u32> videomode_res;
		s32 videomode_depth;
		for (s32 i = 0; i < videomode_count; ++i) {
			videomode_res = videomode_list->getVideoModeResolution(i);
			videomode_depth = videomode_list->getVideoModeDepth(i);
			std::cout << videomode_res.Width << "x" << videomode_res.Height
				  << "x" << videomode_depth << std::endl;
		}

		std::cout << _("Active video mode (WxHxD):") << std::endl;
		videomode_res = videomode_list->getDesktopResolution();
		videomode_depth = videomode_list->getDesktopDepth();
		std::cout << videomode_res.Width << "x" << videomode_res.Height << "x"
			  << videomode_depth << std::endl;
	}

	nulldevice->drop();
	delete receiver;

	return videomode_list != NULL;
}

void RenderingEngine::setXorgClassHint(
		const video::SExposedVideoData &video_data, const std::string &name)
{
#ifdef XORG_USED
	if (video_data.OpenGLLinux.X11Display == NULL)
		return;

	XClassHint *classhint = XAllocClassHint();
	classhint->res_name = (char *)name.c_str();
	classhint->res_class = (char *)name.c_str();

	XSetClassHint((Display *)video_data.OpenGLLinux.X11Display,
			video_data.OpenGLLinux.X11Window, classhint);
	XFree(classhint);
#endif
}

bool RenderingEngine::setWindowIcon()
{
#if defined(XORG_USED)
#if RUN_IN_PLACE
	return setXorgWindowIconFromPath(
			porting::path_share + "/misc/" PROJECT_NAME "-xorg-icon-128.png");
#else
	// We have semi-support for reading in-place data if we are
	// compiled with RUN_IN_PLACE. Don't break with this and
	// also try the path_share location.
	return setXorgWindowIconFromPath(
			       ICON_DIR "/hicolor/128x128/apps/" PROJECT_NAME ".png") ||
	       setXorgWindowIconFromPath(porting::path_share + "/misc/" PROJECT_NAME
							       "-xorg-icon-128.png");
#endif
#elif defined(_WIN32)
	const video::SExposedVideoData exposedData = driver->getExposedVideoData();
	HWND hWnd; // Window handle

	switch (driver->getDriverType()) {
	case video::EDT_DIRECT3D8: