/* ResidualVM - A 3D game interpreter
 *
 * ResidualVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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.
 *
 */

#define FORBIDDEN_SYMBOL_EXCEPTION_putenv

#include "common/scummsys.h"

#if defined(SDL_BACKEND)

#include "backends/graphics/openglsdl/openglsdl-graphics.h"
#include "backends/events/sdl/sdl-events.h"
#include "backends/platform/sdl/sdl.h"
#include "common/config-manager.h"
#include "common/mutex.h"
#include "common/textconsole.h"
#include "common/translation.h"
#include "common/util.h"
#ifdef USE_RGB_COLOR
#include "common/list.h"
#endif
#include "graphics/font.h"
#include "graphics/fontman.h"
#include "graphics/scaler.h"
#include "graphics/surface.h"
#include "graphics/pixelbuffer.h"
#include "gui/EventRecorder.h"

#include "graphics/opengl/context.h"

OpenGLSdlGraphicsManager::OpenGLSdlGraphicsManager(SdlEventSource *sdlEventSource, SdlWindow *window)
	:
	ResVmSdlGraphicsManager(sdlEventSource, window),
#if SDL_VERSION_ATLEAST(2, 0, 0)
	_glContext(nullptr),
#endif
	_overlayscreen(0),
	_gameRect(),
	_frameBuffer(nullptr),
	_surfaceRenderer(nullptr) {
	ConfMan.registerDefault("antialiasing", 0);

	_sideTextures[0] = _sideTextures[1] = nullptr;

	// Don't start at zero so that the value is never the same as the surface graphics manager
	_screenChangeCount = 1 << (sizeof(int) * 8 - 2);
}

OpenGLSdlGraphicsManager::~OpenGLSdlGraphicsManager() {
	closeOverlay();
}

bool OpenGLSdlGraphicsManager::hasFeature(OSystem::Feature f) {
	return
		(f == OSystem::kFeatureFullscreenMode) ||
		(f == OSystem::kFeatureOpenGL) ||
		(f == OSystem::kFeatureAspectRatioCorrection);
}

void OpenGLSdlGraphicsManager::setupScreen(uint gameWidth, uint gameHeight, bool fullscreen, bool accel3d) {
	assert(accel3d);
	closeOverlay();

	_antialiasing = ConfMan.getInt("antialiasing");
	_fullscreen = fullscreen;
	_lockAspectRatio = ConfMan.getBool("aspect_ratio");

	bool engineSupportsArbitraryResolutions = g_engine && g_engine->hasFeature(Engine::kSupportsArbitraryResolutions);

	// Detecting if OpenGL framebuffers are available relies on spawning an offscreen window
	// thus it is only done when framebuffers may be used.
	bool framebufferSupported = fullscreen && detectFramebufferSupport();

	// Select how the game screen is going to be drawn
	GameRenderTarget gameRenderTarget = selectGameRenderTarget(_fullscreen, true, engineSupportsArbitraryResolutions,
	                                                           framebufferSupported, _lockAspectRatio);

	// Choose the effective window size or fullscreen mode
	uint effectiveWidth;
	uint effectiveHeight;
	if (_fullscreen && canUsePreferredResolution(gameRenderTarget, engineSupportsArbitraryResolutions)) {
		Common::Rect fullscreenResolution = getPreferredFullscreenResolution();
		effectiveWidth = fullscreenResolution.width();
		effectiveHeight = fullscreenResolution.height();
	} else {
		effectiveWidth = gameWidth;
		effectiveHeight = gameHeight;
	}

	// Compute the rectangle where to draw the game inside the effective screen
	_gameRect = computeGameRect(gameRenderTarget, gameWidth, gameHeight, effectiveWidth, effectiveHeight);

	if (!createScreen(effectiveWidth, effectiveHeight, gameRenderTarget)) {
		warning("Error: %s", SDL_GetError());
		g_system->quit();
	}

	int glflag;
	const GLubyte *str;

	// apply atribute again for sure based on SDL docs
	SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);

	str = glGetString(GL_VENDOR);
	debug("INFO: OpenGL Vendor: %s", str);
	str = glGetString(GL_RENDERER);
	debug("INFO: OpenGL Renderer: %s", str);
	str = glGetString(GL_VERSION);
	debug("INFO: OpenGL Version: %s", str);
	SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &glflag);
	debug("INFO: OpenGL Red bits: %d", glflag);
	SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &glflag);
	debug("INFO: OpenGL Green bits: %d", glflag);
	SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &glflag);
	debug("INFO: OpenGL Blue bits: %d", glflag);
	SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &glflag);
	debug("INFO: OpenGL Alpha bits: %d", glflag);
	SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &glflag);
	debug("INFO: OpenGL Z buffer depth bits: %d", glflag);
	SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &glflag);
	debug("INFO: OpenGL Double Buffer: %d", glflag);
	SDL_GL_GetAttribute(SDL_GL_STENCIL_SIZE, &glflag);
	debug("INFO: OpenGL Stencil buffer bits: %d", glflag);

#ifdef USE_GLEW
	debug("INFO: GLEW Version: %s", glewGetString(GLEW_VERSION));
	GLenum err = glewInit();
	if (err != GLEW_OK) {
		warning("Error: %s", glewGetErrorString(err));
		g_system->quit();
	}
#endif

#ifdef USE_OPENGL_SHADERS
	debug("INFO: GLSL version: %s", glGetString(GL_SHADING_LANGUAGE_VERSION));
#endif

	initializeOpenGLContext();
	_surfaceRenderer = OpenGL::createBestSurfaceRenderer();

	uint32 rmask, gmask, bmask, amask;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
	rmask = 0x00001f00;
	gmask = 0x000007e0;
	bmask = 0x000000f8;
	amask = 0x00000000;
#else
	rmask = 0x0000f800;
	gmask = 0x000007e0;
	bmask = 0x0000001f;
	amask = 0x00000000;
#endif
	_overlayscreen = SDL_CreateRGBSurface(SDL_SWSURFACE, effectiveWidth, effectiveHeight, 16,
	                                      rmask, gmask, bmask, amask);
	_overlayFormat = Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0);

	if (!_overlayscreen) {
		warning("Error: %s", SDL_GetError());
		g_system->quit();
	}

	_overlayWidth = effectiveWidth;
	_overlayHeight = effectiveHeight;
	_screenFormat = _overlayFormat;

	_screenChangeCount++;

#if !defined(AMIGAOS)
	if (gameRenderTarget == kFramebuffer) {
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
		_frameBuffer = createFramebuffer(gameWidth, gameHeight);
		_frameBuffer->attach();
	}
#endif
}

bool OpenGLSdlGraphicsManager::detectFramebufferSupport() {
	bool framebufferSupported = false;
#if defined(USE_GLES2)
	// Framebuffers are always available with GLES2
	framebufferSupported = true;
#elif !defined(AMIGAOS)
	// Spawn a 32x32 window off-screen with a GL context to test if framebuffers are supported
#if SDL_VERSION_ATLEAST(2, 0, 0)
	SDL_Window *window = SDL_CreateWindow("", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 32, 32, SDL_WINDOW_OPENGL | SDL_WINDOW_HIDDEN);
	if (window) {
		SDL_GLContext glContext = SDL_GL_CreateContext(window);
		if (glContext) {
			initializeOpenGLContext();
			framebufferSupported = OpenGLContext.framebufferObjectSupported;
			SDL_GL_DeleteContext(glContext);
		}
		SDL_DestroyWindow(window);
	}
#else
	SDL_putenv(const_cast<char *>("SDL_VIDEO_WINDOW_POS=9000,9000"));
	SDL_SetVideoMode(32, 32, 0, SDL_OPENGL);
	SDL_putenv(const_cast<char *>("SDL_VIDEO_WINDOW_POS=center"));
	initializeOpenGLContext();
	framebufferSupported = OpenGLContext.framebufferObjectSupported;
#endif
#endif
	return framebufferSupported;
}

Graphics::PixelBuffer OpenGLSdlGraphicsManager::getScreenPixelBuffer() {
	error("Direct screen buffer access is not allowed when using OpenGL");
}

void OpenGLSdlGraphicsManager::initializeOpenGLContext() const {
	OpenGL::ContextType type;

#ifdef USE_GLES2
	type = OpenGL::kContextGLES2;
#else
	type = OpenGL::kContextGL;
#endif

	OpenGLContext.initialize(type);
}

OpenGLSdlGraphicsManager::OpenGLPixelFormat::OpenGLPixelFormat(uint screenBytesPerPixel, uint red, uint blue, uint green, uint alpha, int samples) :
		bytesPerPixel(screenBytesPerPixel),
		redSize(red),
		blueSize(blue),
		greenSize(green),
		alphaSize(alpha),
		multisampleSamples(samples) {

}

bool OpenGLSdlGraphicsManager::createScreen(uint effectiveWidth, uint effectiveHeight,
                                            GameRenderTarget gameRenderTarget) {
	// Build a list of OpenGL pixel formats usable by ResidualVM
	Common::Array<OpenGLPixelFormat> pixelFormats;
	if (_antialiasing > 0 && gameRenderTarget == kScreen) {
		// Don't enable screen level multisampling when rendering to a framebuffer
		pixelFormats.push_back(OpenGLPixelFormat(32, 8, 8, 8, 8, _antialiasing));
		pixelFormats.push_back(OpenGLPixelFormat(16, 5, 5, 5, 1, _antialiasing));
		pixelFormats.push_back(OpenGLPixelFormat(16, 5, 6, 5, 0, _antialiasing));
	}
	pixelFormats.push_back(OpenGLPixelFormat(32, 8, 8, 8, 8, 0));
	pixelFormats.push_back(OpenGLPixelFormat(16, 5, 5, 5, 1, 0));
	pixelFormats.push_back(OpenGLPixelFormat(16, 5, 6, 5, 0, 0));

	// Unfortunatly, SDL does not provide a list of valid pixel formats
	// for the current OpenGL implementation and hardware.
	// SDL may not be able to create a screen with the preferred pixel format.
	// Try all the pixel formats in the list until SDL returns a valid screen.
	Common::Array<OpenGLPixelFormat>::const_iterator it = pixelFormats.begin();
	for (; it != pixelFormats.end(); it++) {
		SDL_GL_SetAttribute(SDL_GL_RED_SIZE, it->redSize);
		SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, it->greenSize);
		SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, it->blueSize);
		SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, it->alphaSize);
		SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
		SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
		SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
		SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, it->multisampleSamples > 0);
		SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, it->multisampleSamples);
#if SDL_VERSION_ATLEAST(2, 0, 0)
#ifdef USE_GLES2
		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
		SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
#else
		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
		SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
		SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_COMPATIBILITY);
#endif
#endif

#if SDL_VERSION_ATLEAST(2, 0, 0)
		uint32 sdlflags = SDL_WINDOW_OPENGL;
		if (_fullscreen)
			sdlflags |= SDL_WINDOW_FULLSCREEN;

		if (_window->createWindow(effectiveWidth, effectiveHeight, sdlflags)) {
			_glContext = SDL_GL_CreateContext(_window->getSDLWindow());
			if (_glContext) {
				break;
			}
		}

		_window->destroyWindow();
#else
		uint32 sdlflags = SDL_OPENGL;
		if (_fullscreen)
			sdlflags |= SDL_FULLSCREEN;

		SDL_Surface *screen = SDL_SetVideoMode(effectiveWidth, effectiveHeight, it->bytesPerPixel, sdlflags);
		if (screen) {
			break;
		}
#endif
	}

	// Display a warning if the effective pixel format is not the preferred one
	if (it != pixelFormats.begin() && it != pixelFormats.end()) {
		bool wantsAA = pixelFormats.front().multisampleSamples > 0;
		bool gotAA = it->multisampleSamples > 0;

		warning("Couldn't create a %d-bit visual%s, using to %d-bit%s instead",
		        pixelFormats.front().bytesPerPixel,
		        wantsAA && !gotAA ? " with AA" : "",
		        it->bytesPerPixel,
		        wantsAA && !gotAA ? " without AA" : "");
	}

	return it != pixelFormats.end();
}

#define BITMAP_TEXTURE_SIZE 256

void OpenGLSdlGraphicsManager::updateOverlayTextures() {
	if (!_overlayscreen)
		return;

	// remove if already exist
	for (uint i = 0; i < _overlayTextures.size(); i++) {
		delete _overlayTextures[i];
	}
	_overlayTextures.clear();

	Graphics::Surface overlaySurface;
	overlaySurface.w = _overlayscreen->w;
	overlaySurface.h = _overlayscreen->h;
	overlaySurface.pitch = _overlayscreen->pitch;
	overlaySurface.format = getOverlayFormat();
	overlaySurface.setPixels(_overlayscreen->pixels);

	for (int y = 0; y < _overlayHeight; y += BITMAP_TEXTURE_SIZE) {
		for (int x = 0; x < _overlayWidth; x += BITMAP_TEXTURE_SIZE) {
			int t_width = (x + BITMAP_TEXTURE_SIZE >= _overlayWidth) ? (_overlayWidth - x) : BITMAP_TEXTURE_SIZE;
			int t_height = (y + BITMAP_TEXTURE_SIZE >= _overlayHeight) ? (_overlayHeight - y) : BITMAP_TEXTURE_SIZE;

			Common::Rect textureArea = Common::Rect(t_width, t_height);
			textureArea.translate(x, y);

			const Graphics::Surface subSurface = overlaySurface.getSubArea(textureArea);
			_overlayTextures.push_back(new OpenGL::Texture(subSurface));
		}
	}
}

void OpenGLSdlGraphicsManager::drawOverlay() {
	if (!_overlayscreen)
		return;

	glViewport(0, 0, _overlayWidth, _overlayHeight);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);

	_surfaceRenderer->prepareState();

	int curTexIdx = 0;
	for (int y = 0; y < _overlayHeight; y += BITMAP_TEXTURE_SIZE) {
		for (int x = 0; x < _overlayWidth; x += BITMAP_TEXTURE_SIZE) {
			OpenGL::Texture *texture = _overlayTextures[curTexIdx];

			Common::Rect textureArea = Common::Rect(texture->getWidth(), texture->getHeight());
			textureArea.translate(x, y);

			Math::Vector2d topLeft = Math::Vector2d(textureArea.left / (float)_overlayWidth, textureArea.top / (float)_overlayHeight);
			Math::Vector2d bottomRight = Math::Vector2d(textureArea.right / (float)_overlayWidth, textureArea.bottom / (float)_overlayHeight);

			_surfaceRenderer->render(texture, Math::Rect2d(topLeft, bottomRight), true);

			curTexIdx++;
		}
	}

	_surfaceRenderer->restorePreviousState();
}

void OpenGLSdlGraphicsManager::drawSideTextures() {
	if (_fullscreen && _lockAspectRatio) {
		const Math::Vector2d nudge(1.0 / float(_overlayWidth), 0);
		if (_sideTextures[0] != nullptr) {
			float left = _gameRect.getBottomLeft().getX() - (float(_overlayHeight) / float(_sideTextures[0]->getHeight())) * _sideTextures[0]->getWidth() / float(_overlayWidth);
			Math::Rect2d leftRect(Math::Vector2d(left, 0.0), _gameRect.getBottomLeft() + nudge);
			_surfaceRenderer->render(_sideTextures[0], leftRect, true);
		}

		if (_sideTextures[1] != nullptr) {
			float right = _gameRect.getTopRight().getX() + (float(_overlayHeight) / float(_sideTextures[1]->getHeight())) * _sideTextures[1]->getWidth() / float(_overlayWidth);
			Math::Rect2d rightRect(_gameRect.getTopRight() - nudge, Math::Vector2d(right, 1.0));
			_surfaceRenderer->render(_sideTextures[1], rightRect, true);
		}
	}
}

#ifndef AMIGAOS
OpenGL::FrameBuffer *OpenGLSdlGraphicsManager::createFramebuffer(uint width, uint height) {
#if !defined(USE_GLES2)
	if (_antialiasing && OpenGLContext.framebufferObjectMultisampleSupported) {
		return new OpenGL::MultiSampleFrameBuffer(width, height, _antialiasing);
	} else
#endif
	{
		return new OpenGL::FrameBuffer(width, height);
	}
}
#endif // AMIGAOS

void OpenGLSdlGraphicsManager::updateScreen() {
	if (_frameBuffer) {
		_frameBuffer->detach();
		glViewport(0, 0, _overlayWidth, _overlayHeight);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
		_surfaceRenderer->prepareState();
		drawSideTextures();
		_surfaceRenderer->render(_frameBuffer, _gameRect);
		_surfaceRenderer->restorePreviousState();
	}

	if (_overlayVisible) {
		if (_overlayDirty) {
			updateOverlayTextures();
		}

		drawOverlay();
	}

#if SDL_VERSION_ATLEAST(2, 0, 0)
	SDL_GL_SwapWindow(_window->getSDLWindow());
#else
	SDL_GL_SwapBuffers();
#endif

	if (_frameBuffer) {
		_frameBuffer->attach();
	}
}

int16 OpenGLSdlGraphicsManager::getHeight() {
	// ResidualVM specific
	if (_frameBuffer)
		return _frameBuffer->getHeight();
	else
		return _overlayHeight;
}

int16 OpenGLSdlGraphicsManager::getWidth() {
	// ResidualVM specific
	if (_frameBuffer)
		return _frameBuffer->getWidth();
	else
		return _overlayWidth;
}

#pragma mark -
#pragma mark --- Overlays ---
#pragma mark -

void OpenGLSdlGraphicsManager::clearOverlay() {
	if (!_overlayscreen)
		return;

	if (!_overlayVisible)
		return;

	SDL_Surface *tmp = SDL_CreateRGBSurface(SDL_SWSURFACE, _overlayWidth, _overlayHeight,
			_overlayscreen->format->BytesPerPixel * 8,
			_overlayscreen->format->Rmask, _overlayscreen->format->Gmask,
			_overlayscreen->format->Bmask, _overlayscreen->format->Amask);

	SDL_LockSurface(tmp);
	SDL_LockSurface(_overlayscreen);

	glReadPixels(0, 0, _overlayWidth, _overlayHeight, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, tmp->pixels);

	// Flip pixels vertically
	byte *src = (byte *)tmp->pixels;
	byte *buf = (byte *)_overlayscreen->pixels + (_overlayHeight - 1) * _overlayscreen->pitch;
	int h = _overlayHeight;
	do {
		memcpy(buf, src, _overlayWidth * _overlayscreen->format->BytesPerPixel);
		src += tmp->pitch;
		buf -= _overlayscreen->pitch;
	} while (--h);

	SDL_UnlockSurface(_overlayscreen);
	SDL_UnlockSurface(tmp);

	SDL_FreeSurface(tmp);

	_overlayDirty = true;
}

void OpenGLSdlGraphicsManager::setSideTextures(Graphics::Surface *left, Graphics::Surface *right) {
	delete _sideTextures[0];
	_sideTextures[0] = nullptr;
	delete _sideTextures[1];
	_sideTextures[1] = nullptr;
	if (left) {
		_sideTextures[0] = new OpenGL::Texture(*left);
	}
	if (right) {
		_sideTextures[1] = new OpenGL::Texture(*right);
	}
}

void OpenGLSdlGraphicsManager::grabOverlay(void *buf, int pitch) {
	if (_overlayscreen == NULL)
		return;

	if (SDL_LockSurface(_overlayscreen) == -1)
		error("SDL_LockSurface failed: %s", SDL_GetError());

	byte *src = (byte *)_overlayscreen->pixels;
	byte *dst = (byte *)buf;
	int h = _overlayHeight;
	do {
		memcpy(dst, src, _overlayWidth * _overlayscreen->format->BytesPerPixel);
		src += _overlayscreen->pitch;
		dst += pitch;
	} while (--h);

	SDL_UnlockSurface(_overlayscreen);
}

void OpenGLSdlGraphicsManager::copyRectToOverlay(const void *buf, int pitch, int x, int y, int w, int h) {
	if (_overlayscreen == NULL)
		return;

	const byte *src = (const byte *)buf;

	// Clip the coordinates
	if (x < 0) {
		w += x;
		src -= x * _overlayscreen->format->BytesPerPixel;
		x = 0;
	}

	if (y < 0) {
		h += y;
		src -= y * pitch;
		y = 0;
	}

	if (w > _overlayWidth - x) {
		w = _overlayWidth - x;
	}

	if (h > _overlayHeight - y) {
		h = _overlayHeight - y;
	}

	if (w <= 0 || h <= 0)
		return;

	if (SDL_LockSurface(_overlayscreen) == -1)
		error("SDL_LockSurface failed: %s", SDL_GetError());

	byte *dst = (byte *)_overlayscreen->pixels + y * _overlayscreen->pitch + x * _overlayscreen->format->BytesPerPixel;
	do {
		memcpy(dst, src, w * _overlayscreen->format->BytesPerPixel);
		dst += _overlayscreen->pitch;
		src += pitch;
	} while (--h);

	SDL_UnlockSurface(_overlayscreen);
}

void OpenGLSdlGraphicsManager::closeOverlay() {
	delete _sideTextures[0];
	delete _sideTextures[1];
	_sideTextures[0] = _sideTextures[1] = nullptr;

	if (_overlayscreen) {
		SDL_FreeSurface(_overlayscreen);
		_overlayscreen = nullptr;
	}

	delete _surfaceRenderer;
	_surfaceRenderer = nullptr;

	for (uint i = 0; i < _overlayTextures.size(); i++) {
		delete _overlayTextures[i];
	}
	_overlayTextures.clear();

	delete _frameBuffer;
	_frameBuffer = nullptr;

	OpenGL::Context::destroy();

#if SDL_VERSION_ATLEAST(2, 0, 0)
	deinitializeRenderer();
#endif
}

void OpenGLSdlGraphicsManager::warpMouse(int x, int y) {
	//ResidualVM specific
	if (_frameBuffer) {
		// Scale from game coordinates to screen coordinates
		x = (x * _gameRect.getWidth() * _overlayWidth) / _frameBuffer->getWidth();
		y = (y * _gameRect.getHeight() * _overlayHeight) / _frameBuffer->getHeight();

		x += _gameRect.getTopLeft().getX() * _overlayWidth;
		y += _gameRect.getTopLeft().getY() * _overlayHeight;
	}

	_window->warpMouseInWindow(x, y);
}

void OpenGLSdlGraphicsManager::transformMouseCoordinates(Common::Point &point) {
	if (_overlayVisible || !_frameBuffer)
		return;

	// Scale from screen coordinates to game coordinates
	point.x -= _gameRect.getTopLeft().getX() * _overlayWidth;
	point.y -= _gameRect.getTopLeft().getY() * _overlayHeight;

	point.x = (point.x * _frameBuffer->getWidth())  / (_gameRect.getWidth() * _overlayWidth);
	point.y = (point.y * _frameBuffer->getHeight()) / (_gameRect.getHeight() * _overlayHeight);

	// Make sure we only supply valid coordinates.
	point.x = CLIP<int16>(point.x, 0, _frameBuffer->getWidth() - 1);
	point.y = CLIP<int16>(point.y, 0, _frameBuffer->getHeight() - 1);
}

#if SDL_VERSION_ATLEAST(2, 0, 0)
void OpenGLSdlGraphicsManager::deinitializeRenderer() {
	SDL_GL_DeleteContext(_glContext);
	_glContext = nullptr;

	_window->destroyWindow();
}
#endif // SDL_VERSION_ATLEAST(2, 0, 0)

#endif