openttd 1.4 rc1

--HG-- branch : openttd
2014-03-25 15:18:09 +04:00
commit 09818a1493
1569 changed files with 707338 additions and 0 deletions
@@ -0,0 +1,850 @@
+/* $Id: sdl_v.cpp 26351 2014-02-16 21:57:22Z frosch $ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD 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, version 2.
+ * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file sdl_v.cpp Implementation of the SDL video driver. */
+
+#ifdef WITH_SDL
+
+#include "../stdafx.h"
+#include "../openttd.h"
+#include "../gfx_func.h"
+#include "../sdl.h"
+#include "../rev.h"
+#include "../blitter/factory.hpp"
+#include "../network/network.h"
+#include "../thread/thread.h"
+#include "../progress.h"
+#include "../core/random_func.hpp"
+#include "../core/math_func.hpp"
+#include "../fileio_func.h"
+#include "sdl_v.h"
+#include <SDL.h>
+
+static FVideoDriver_SDL iFVideoDriver_SDL;
+
+static SDL_Surface *_sdl_screen;
+static SDL_Surface *_sdl_realscreen;
+static bool _all_modes;
+
+/** Whether the drawing is/may be done in a separate thread. */
+static bool _draw_threaded;
+/** Thread used to 'draw' to the screen, i.e. push data to the screen. */
+static ThreadObject *_draw_thread = NULL;
+/** Mutex to keep the access to the shared memory controlled. */
+static ThreadMutex *_draw_mutex = NULL;
+/** Should we keep continue drawing? */
+static volatile bool _draw_continue;
+static Palette _local_palette;
+
+#define MAX_DIRTY_RECTS 100
+static SDL_Rect _dirty_rects[MAX_DIRTY_RECTS];
+static int _num_dirty_rects;
+static int _use_hwpalette;
+static int _requested_hwpalette; /* Did we request a HWPALETTE for the current video mode? */
+
+void VideoDriver_SDL::MakeDirty(int left, int top, int width, int height)
+{
+	if (_num_dirty_rects < MAX_DIRTY_RECTS) {
+		_dirty_rects[_num_dirty_rects].x = left;
+		_dirty_rects[_num_dirty_rects].y = top;
+		_dirty_rects[_num_dirty_rects].w = width;
+		_dirty_rects[_num_dirty_rects].h = height;
+	}
+	_num_dirty_rects++;
+}
+
+static void UpdatePalette(bool init = false)
+{
+	SDL_Color pal[256];
+
+	for (int i = 0; i != _local_palette.count_dirty; i++) {
+		pal[i].r = _local_palette.palette[_local_palette.first_dirty + i].r;
+		pal[i].g = _local_palette.palette[_local_palette.first_dirty + i].g;
+		pal[i].b = _local_palette.palette[_local_palette.first_dirty + i].b;
+		pal[i].unused = 0;
+	}
+
+	SDL_CALL SDL_SetColors(_sdl_screen, pal, _local_palette.first_dirty, _local_palette.count_dirty);
+
+	if (_sdl_screen != _sdl_realscreen && init) {
+		/* When using a shadow surface, also set our palette on the real screen. This lets SDL
+		 * allocate as much colors (or approximations) as
+		 * possible, instead of using only the default SDL
+		 * palette. This allows us to get more colors exactly
+		 * right and might allow using better approximations for
+		 * other colors.
+		 *
+		 * Note that colors allocations are tried in-order, so
+		 * this favors colors further up into the palette. Also
+		 * note that if two colors from the same animation
+		 * sequence are approximated using the same color, that
+		 * animation will stop working.
+		 *
+		 * Since changing the system palette causes the colours
+		 * to change right away, and allocations might
+		 * drastically change, we can't use this for animation,
+		 * since that could cause weird coloring between the
+		 * palette change and the blitting below, so we only set
+		 * the real palette during initialisation.
+		 */
+		SDL_CALL SDL_SetColors(_sdl_realscreen, pal, _local_palette.first_dirty, _local_palette.count_dirty);
+	}
+
+	if (_sdl_screen != _sdl_realscreen && !init) {
+		/* We're not using real hardware palette, but are letting SDL
+		 * approximate the palette during shadow -> screen copy. To
+		 * change the palette, we need to recopy the entire screen.
+		 *
+		 * Note that this operation can slow down the rendering
+		 * considerably, especially since changing the shadow
+		 * palette will need the next blit to re-detect the
+		 * best mapping of shadow palette colors to real palette
+		 * colors from scratch.
+		 */
+		SDL_CALL SDL_BlitSurface(_sdl_screen, NULL, _sdl_realscreen, NULL);
+		SDL_CALL SDL_UpdateRect(_sdl_realscreen, 0, 0, 0, 0);
+	}
+}
+
+static void InitPalette()
+{
+	_local_palette = _cur_palette;
+	_local_palette.first_dirty = 0;
+	_local_palette.count_dirty = 256;
+	UpdatePalette(true);
+}
+
+static void CheckPaletteAnim()
+{
+	if (_cur_palette.count_dirty != 0) {
+		Blitter *blitter = BlitterFactory::GetCurrentBlitter();
+
+		switch (blitter->UsePaletteAnimation()) {
+			case Blitter::PALETTE_ANIMATION_VIDEO_BACKEND:
+				UpdatePalette();
+				break;
+
+			case Blitter::PALETTE_ANIMATION_BLITTER:
+				blitter->PaletteAnimate(_local_palette);
+				break;
+
+			case Blitter::PALETTE_ANIMATION_NONE:
+				break;
+
+			default:
+				NOT_REACHED();
+		}
+		_cur_palette.count_dirty = 0;
+	}
+}
+
+static void DrawSurfaceToScreen()
+{
+	int n = _num_dirty_rects;
+	if (n == 0) return;
+
+	_num_dirty_rects = 0;
+	if (n > MAX_DIRTY_RECTS) {
+		if (_sdl_screen != _sdl_realscreen) {
+			SDL_CALL SDL_BlitSurface(_sdl_screen, NULL, _sdl_realscreen, NULL);
+		}
+		SDL_CALL SDL_UpdateRect(_sdl_realscreen, 0, 0, 0, 0);
+	} else {
+		if (_sdl_screen != _sdl_realscreen) {
+			for (int i = 0; i < n; i++) {
+				SDL_CALL SDL_BlitSurface(_sdl_screen, &_dirty_rects[i], _sdl_realscreen, &_dirty_rects[i]);
+			}
+		}
+		SDL_CALL SDL_UpdateRects(_sdl_realscreen, n, _dirty_rects);
+	}
+}
+
+static void DrawSurfaceToScreenThread(void *)
+{
+	/* First tell the main thread we're started */
+	_draw_mutex->BeginCritical();
+	_draw_mutex->SendSignal();
+
+	/* Now wait for the first thing to draw! */
+	_draw_mutex->WaitForSignal();
+
+	while (_draw_continue) {
+		CheckPaletteAnim();
+		/* Then just draw and wait till we stop */
+		DrawSurfaceToScreen();
+		_draw_mutex->WaitForSignal();
+	}
+
+	_draw_mutex->EndCritical();
+	_draw_thread->Exit();
+}
+
+static const Dimension _default_resolutions[] = {
+	{ 640,  480},
+	{ 800,  600},
+	{1024,  768},
+	{1152,  864},
+	{1280,  800},
+	{1280,  960},
+	{1280, 1024},
+	{1400, 1050},
+	{1600, 1200},
+	{1680, 1050},
+	{1920, 1200}
+};
+
+static void GetVideoModes()
+{
+	SDL_Rect **modes = SDL_CALL SDL_ListModes(NULL, SDL_SWSURFACE | SDL_FULLSCREEN);
+	if (modes == NULL) usererror("sdl: no modes available");
+
+	_all_modes = (SDL_CALL SDL_ListModes(NULL, SDL_SWSURFACE | (_fullscreen ? SDL_FULLSCREEN : 0)) == (void*)-1);
+	if (modes == (void*)-1) {
+		int n = 0;
+		for (uint i = 0; i < lengthof(_default_resolutions); i++) {
+			if (SDL_CALL SDL_VideoModeOK(_default_resolutions[i].width, _default_resolutions[i].height, 8, SDL_FULLSCREEN) != 0) {
+				_resolutions[n] = _default_resolutions[i];
+				if (++n == lengthof(_resolutions)) break;
+			}
+		}
+		_num_resolutions = n;
+	} else {
+		int n = 0;
+		for (int i = 0; modes[i]; i++) {
+			uint w = modes[i]->w;
+			uint h = modes[i]->h;
+			int j;
+			for (j = 0; j < n; j++) {
+				if (_resolutions[j].width == w && _resolutions[j].height == h) break;
+			}
+
+			if (j == n) {
+				_resolutions[j].width  = w;
+				_resolutions[j].height = h;
+				if (++n == lengthof(_resolutions)) break;
+			}
+		}
+		_num_resolutions = n;
+		SortResolutions(_num_resolutions);
+	}
+}
+
+static void GetAvailableVideoMode(uint *w, uint *h)
+{
+	/* All modes available? */
+	if (_all_modes || _num_resolutions == 0) return;
+
+	/* Is the wanted mode among the available modes? */
+	for (int i = 0; i != _num_resolutions; i++) {
+		if (*w == _resolutions[i].width && *h == _resolutions[i].height) return;
+	}
+
+	/* Use the closest possible resolution */
+	int best = 0;
+	uint delta = Delta(_resolutions[0].width, *w) * Delta(_resolutions[0].height, *h);
+	for (int i = 1; i != _num_resolutions; ++i) {
+		uint newdelta = Delta(_resolutions[i].width, *w) * Delta(_resolutions[i].height, *h);
+		if (newdelta < delta) {
+			best = i;
+			delta = newdelta;
+		}
+	}
+	*w = _resolutions[best].width;
+	*h = _resolutions[best].height;
+}
+
+#ifdef WIN32
+/* Let's redefine the LoadBMP macro with because we are dynamically
+ * loading SDL and need to 'SDL_CALL' all functions */
+#undef SDL_LoadBMP
+#define SDL_LoadBMP(file)	SDL_LoadBMP_RW(SDL_CALL SDL_RWFromFile(file, "rb"), 1)
+#endif
+
+bool VideoDriver_SDL::CreateMainSurface(uint w, uint h)
+{
+	SDL_Surface *newscreen, *icon;
+	char caption[50];
+	int bpp = BlitterFactory::GetCurrentBlitter()->GetScreenDepth();
+	bool want_hwpalette;
+
+	GetAvailableVideoMode(&w, &h);
+
+	DEBUG(driver, 1, "SDL: using mode %ux%ux%d", w, h, bpp);
+
+	if (bpp == 0) usererror("Can't use a blitter that blits 0 bpp for normal visuals");
+
+	char icon_path[MAX_PATH];
+	if (FioFindFullPath(icon_path, lengthof(icon_path), BASESET_DIR, "openttd.32.bmp") != NULL) {
+		/* Give the application an icon */
+		icon = SDL_CALL SDL_LoadBMP(icon_path);
+		if (icon != NULL) {
+			/* Get the colourkey, which will be magenta */
+			uint32 rgbmap = SDL_CALL SDL_MapRGB(icon->format, 255, 0, 255);
+
+			SDL_CALL SDL_SetColorKey(icon, SDL_SRCCOLORKEY, rgbmap);
+			SDL_CALL SDL_WM_SetIcon(icon, NULL);
+			SDL_CALL SDL_FreeSurface(icon);
+		}
+	}
+
+	if (_use_hwpalette == 2) {
+		/* Default is to autodetect when to use SDL_HWPALETTE.
+		 * In this case, SDL_HWPALETTE is only used for 8bpp
+		 * blitters in fullscreen.
+		 *
+		 * When using an 8bpp blitter on a 8bpp system in
+		 * windowed mode with SDL_HWPALETTE, OpenTTD will claim
+		 * the system palette, making all other applications
+		 * get the wrong colours. In this case, we're better of
+		 * trying to approximate the colors we need using system
+		 * colors, using a shadow surface (see below).
+		 *
+		 * On a 32bpp system, SDL_HWPALETTE is ignored, so it
+		 * doesn't matter what we do.
+		 *
+		 * When using a 32bpp blitter on a 8bpp system, setting
+		 * SDL_HWPALETTE messes up rendering (at least on X11),
+		 * so we don't do that. In this case, SDL takes care of
+		 * color approximation using its own shadow surface
+		 * (which we can't force in 8bpp on 8bpp mode,
+		 * unfortunately).
+		 */
+		want_hwpalette = (bpp == 8 && _fullscreen);
+	} else {
+		/* User specified a value manually */
+		want_hwpalette = _use_hwpalette;
+	}
+
+	if (want_hwpalette) DEBUG(driver, 1, "SDL: requesting hardware palete");
+
+	/* Free any previously allocated shadow surface */
+	if (_sdl_screen != NULL && _sdl_screen != _sdl_realscreen) SDL_CALL SDL_FreeSurface(_sdl_screen);
+
+	if (_sdl_realscreen != NULL) {
+		if (_requested_hwpalette != want_hwpalette) {
+			/* SDL (at least the X11 driver), reuses the
+			 * same window and palette settings when the bpp
+			 * (and a few flags) are the same. Since we need
+			 * to hwpalette value to change (in particular
+			 * when switching between fullscreen and
+			 * windowed), we restart the entire video
+			 * subsystem to force creating a new window.
+			 */
+			DEBUG(driver, 0, "SDL: Restarting SDL video subsystem, to force hwpalette change");
+			SDL_CALL SDL_QuitSubSystem(SDL_INIT_VIDEO);
+			SDL_CALL SDL_InitSubSystem(SDL_INIT_VIDEO);
+			ClaimMousePointer();
+			SetupKeyboard();
+		}
+	}
+	/* Remember if we wanted a hwpalette. We can't reliably query
+	 * SDL for the SDL_HWPALETTE flag, since it might get set even
+	 * though we didn't ask for it (when SDL creates a shadow
+	 * surface, for example). */
+	_requested_hwpalette = want_hwpalette;
+
+	/* DO NOT CHANGE TO HWSURFACE, IT DOES NOT WORK */
+	newscreen = SDL_CALL SDL_SetVideoMode(w, h, bpp, SDL_SWSURFACE | (want_hwpalette ? SDL_HWPALETTE : 0) | (_fullscreen ? SDL_FULLSCREEN : SDL_RESIZABLE));
+	if (newscreen == NULL) {
+		DEBUG(driver, 0, "SDL: Couldn't allocate a window to draw on");
+		return false;
+	}
+	_sdl_realscreen = newscreen;
+
+	if (bpp == 8 && (_sdl_realscreen->flags & SDL_HWPALETTE) != SDL_HWPALETTE) {
+		/* Using an 8bpp blitter, if we didn't get a hardware
+		 * palette (most likely because we didn't request one,
+		 * see above), we'll have to set up a shadow surface to
+		 * render on.
+		 *
+		 * Our palette will be applied to this shadow surface,
+		 * while the real screen surface will use the shared
+		 * system palette (which will partly contain our colors,
+		 * but most likely will not have enough free color cells
+		 * for all of our colors). SDL can use these two
+		 * palettes at blit time to approximate colors used in
+		 * the shadow surface using system colors automatically.
+		 *
+		 * Note that when using an 8bpp blitter on a 32bpp
+		 * system, SDL will create an internal shadow surface.
+		 * This shadow surface will have SDL_HWPALLETE set, so
+		 * we won't create a second shadow surface in this case.
+		 */
+		DEBUG(driver, 1, "SDL: using shadow surface");
+		newscreen = SDL_CALL SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, bpp, 0, 0, 0, 0);
+		if (newscreen == NULL) {
+			DEBUG(driver, 0, "SDL: Couldn't allocate a shadow surface to draw on");
+			return false;
+		}
+	}
+
+	/* Delay drawing for this cycle; the next cycle will redraw the whole screen */
+	_num_dirty_rects = 0;
+
+	_screen.width = newscreen->w;
+	_screen.height = newscreen->h;
+	_screen.pitch = newscreen->pitch / (bpp / 8);
+	_screen.dst_ptr = newscreen->pixels;
+	_sdl_screen = newscreen;
+
+	/* When in full screen, we will always have the mouse cursor
+	 * within the window, even though SDL does not give us the
+	 * appropriate event to know this. */
+	if (_fullscreen) _cursor.in_window = true;
+
+	Blitter *blitter = BlitterFactory::GetCurrentBlitter();
+	blitter->PostResize();
+
+	InitPalette();
+	switch (blitter->UsePaletteAnimation()) {
+		case Blitter::PALETTE_ANIMATION_NONE:
+		case Blitter::PALETTE_ANIMATION_VIDEO_BACKEND:
+			UpdatePalette();
+			break;
+
+		case Blitter::PALETTE_ANIMATION_BLITTER:
+			if (_video_driver != NULL) blitter->PaletteAnimate(_local_palette);
+			break;
+
+		default:
+			NOT_REACHED();
+	}
+
+	snprintf(caption, sizeof(caption), "OpenTTD %s", _openttd_revision);
+	SDL_CALL SDL_WM_SetCaption(caption, caption);
+
+	GameSizeChanged();
+
+	return true;
+}
+
+bool VideoDriver_SDL::ClaimMousePointer()
+{
+	SDL_CALL SDL_ShowCursor(0);
+	return true;
+}
+
+struct VkMapping {
+#if SDL_VERSION_ATLEAST(1, 3, 0)
+	SDL_Keycode vk_from;
+#else
+	uint16 vk_from;
+#endif
+	byte vk_count;
+	byte map_to;
+};
+
+#define AS(x, z) {x, 0, z}
+#define AM(x, y, z, w) {x, (byte)(y - x), z}
+
+static const VkMapping _vk_mapping[] = {
+	/* Pageup stuff + up/down */
+	AM(SDLK_PAGEUP, SDLK_PAGEDOWN, WKC_PAGEUP, WKC_PAGEDOWN),
+	AS(SDLK_UP,     WKC_UP),
+	AS(SDLK_DOWN,   WKC_DOWN),
+	AS(SDLK_LEFT,   WKC_LEFT),
+	AS(SDLK_RIGHT,  WKC_RIGHT),
+
+	AS(SDLK_HOME,   WKC_HOME),
+	AS(SDLK_END,    WKC_END),
+
+	AS(SDLK_INSERT, WKC_INSERT),
+	AS(SDLK_DELETE, WKC_DELETE),
+
+	/* Map letters & digits */
+	AM(SDLK_a, SDLK_z, 'A', 'Z'),
+	AM(SDLK_0, SDLK_9, '0', '9'),
+
+	AS(SDLK_ESCAPE,    WKC_ESC),
+	AS(SDLK_PAUSE,     WKC_PAUSE),
+	AS(SDLK_BACKSPACE, WKC_BACKSPACE),
+
+	AS(SDLK_SPACE,     WKC_SPACE),
+	AS(SDLK_RETURN,    WKC_RETURN),
+	AS(SDLK_TAB,       WKC_TAB),
+
+	/* Function keys */
+	AM(SDLK_F1, SDLK_F12, WKC_F1, WKC_F12),
+
+	/* Numeric part. */
+	AM(SDLK_KP0, SDLK_KP9, '0', '9'),
+	AS(SDLK_KP_DIVIDE,   WKC_NUM_DIV),
+	AS(SDLK_KP_MULTIPLY, WKC_NUM_MUL),
+	AS(SDLK_KP_MINUS,    WKC_NUM_MINUS),
+	AS(SDLK_KP_PLUS,     WKC_NUM_PLUS),
+	AS(SDLK_KP_ENTER,    WKC_NUM_ENTER),
+	AS(SDLK_KP_PERIOD,   WKC_NUM_DECIMAL),
+
+	/* Other non-letter keys */
+	AS(SDLK_SLASH,        WKC_SLASH),
+	AS(SDLK_SEMICOLON,    WKC_SEMICOLON),
+	AS(SDLK_EQUALS,       WKC_EQUALS),
+	AS(SDLK_LEFTBRACKET,  WKC_L_BRACKET),
+	AS(SDLK_BACKSLASH,    WKC_BACKSLASH),
+	AS(SDLK_RIGHTBRACKET, WKC_R_BRACKET),
+
+	AS(SDLK_QUOTE,   WKC_SINGLEQUOTE),
+	AS(SDLK_COMMA,   WKC_COMMA),
+	AS(SDLK_MINUS,   WKC_MINUS),
+	AS(SDLK_PERIOD,  WKC_PERIOD)
+};
+
+static uint ConvertSdlKeyIntoMy(SDL_keysym *sym, WChar *character)
+{
+	const VkMapping *map;
+	uint key = 0;
+
+	for (map = _vk_mapping; map != endof(_vk_mapping); ++map) {
+		if ((uint)(sym->sym - map->vk_from) <= map->vk_count) {
+			key = sym->sym - map->vk_from + map->map_to;
+			break;
+		}
+	}
+
+	/* check scancode for BACKQUOTE key, because we want the key left of "1", not anything else (on non-US keyboards) */
+#if defined(WIN32) || defined(__OS2__)
+	if (sym->scancode == 41) key = WKC_BACKQUOTE;
+#elif defined(__APPLE__)
+	if (sym->scancode == 10) key = WKC_BACKQUOTE;
+#elif defined(__MORPHOS__)
+	if (sym->scancode == 0)  key = WKC_BACKQUOTE;  // yes, that key is code '0' under MorphOS :)
+#elif defined(__BEOS__)
+	if (sym->scancode == 17) key = WKC_BACKQUOTE;
+#elif defined(__SVR4) && defined(__sun)
+	if (sym->scancode == 60) key = WKC_BACKQUOTE;
+	if (sym->scancode == 49) key = WKC_BACKSPACE;
+#elif defined(__sgi__)
+	if (sym->scancode == 22) key = WKC_BACKQUOTE;
+#else
+	if (sym->scancode == 49) key = WKC_BACKQUOTE;
+#endif
+
+	/* META are the command keys on mac */
+	if (sym->mod & KMOD_META)  key |= WKC_META;
+	if (sym->mod & KMOD_SHIFT) key |= WKC_SHIFT;
+	if (sym->mod & KMOD_CTRL)  key |= WKC_CTRL;
+	if (sym->mod & KMOD_ALT)   key |= WKC_ALT;
+
+	*character = sym->unicode;
+	return key;
+}
+
+int VideoDriver_SDL::PollEvent()
+{
+	SDL_Event ev;
+
+	if (!SDL_CALL SDL_PollEvent(&ev)) return -2;
+
+	switch (ev.type) {
+		case SDL_MOUSEMOTION:
+			if (_cursor.fix_at) {
+				int dx = ev.motion.x - _cursor.pos.x;
+				int dy = ev.motion.y - _cursor.pos.y;
+				if (dx != 0 || dy != 0) {
+					_cursor.delta.x = dx;
+					_cursor.delta.y = dy;
+					SDL_CALL SDL_WarpMouse(_cursor.pos.x, _cursor.pos.y);
+				}
+			} else {
+				_cursor.delta.x = ev.motion.x - _cursor.pos.x;
+				_cursor.delta.y = ev.motion.y - _cursor.pos.y;
+				_cursor.pos.x = ev.motion.x;
+				_cursor.pos.y = ev.motion.y;
+				_cursor.dirty = true;
+			}
+			HandleMouseEvents();
+			break;
+
+		case SDL_MOUSEBUTTONDOWN:
+			if (_rightclick_emulate && SDL_CALL SDL_GetModState() & KMOD_CTRL) {
+				ev.button.button = SDL_BUTTON_RIGHT;
+			}
+
+			switch (ev.button.button) {
+				case SDL_BUTTON_LEFT:
+					_left_button_down = true;
+					break;
+
+				case SDL_BUTTON_RIGHT:
+					_right_button_down = true;
+					_right_button_clicked = true;
+					break;
+
+				case SDL_BUTTON_WHEELUP:   _cursor.wheel--; break;
+				case SDL_BUTTON_WHEELDOWN: _cursor.wheel++; break;
+
+				default: break;
+			}
+			HandleMouseEvents();
+			break;
+
+		case SDL_MOUSEBUTTONUP:
+			if (_rightclick_emulate) {
+				_right_button_down = false;
+				_left_button_down = false;
+				_left_button_clicked = false;
+			} else if (ev.button.button == SDL_BUTTON_LEFT) {
+				_left_button_down = false;
+				_left_button_clicked = false;
+			} else if (ev.button.button == SDL_BUTTON_RIGHT) {
+				_right_button_down = false;
+			}
+			HandleMouseEvents();
+			break;
+
+		case SDL_ACTIVEEVENT:
+			if (!(ev.active.state & SDL_APPMOUSEFOCUS)) break;
+
+			if (ev.active.gain) { // mouse entered the window, enable cursor
+				_cursor.in_window = true;
+			} else {
+				UndrawMouseCursor(); // mouse left the window, undraw cursor
+				_cursor.in_window = false;
+			}
+			break;
+
+		case SDL_QUIT:
+			HandleExitGameRequest();
+			break;
+
+		case SDL_KEYDOWN: // Toggle full-screen on ALT + ENTER/F
+			if ((ev.key.keysym.mod & (KMOD_ALT | KMOD_META)) &&
+					(ev.key.keysym.sym == SDLK_RETURN || ev.key.keysym.sym == SDLK_f)) {
+				ToggleFullScreen(!_fullscreen);
+			} else {
+				WChar character;
+				uint keycode = ConvertSdlKeyIntoMy(&ev.key.keysym, &character);
+				HandleKeypress(keycode, character);
+			}
+			break;
+
+		case SDL_VIDEORESIZE: {
+			int w = max(ev.resize.w, 64);
+			int h = max(ev.resize.h, 64);
+			CreateMainSurface(w, h);
+			break;
+		}
+		case SDL_VIDEOEXPOSE: {
+			/* Force a redraw of the entire screen. Note
+			 * that SDL 1.2 seems to do this automatically
+			 * in most cases, but 1.3 / 2.0 does not. */
+		        _num_dirty_rects = MAX_DIRTY_RECTS + 1;
+			break;
+		}
+	}
+	return -1;
+}
+
+const char *VideoDriver_SDL::Start(const char * const *parm)
+{
+	char buf[30];
+	_use_hwpalette = GetDriverParamInt(parm, "hw_palette", 2);
+
+	const char *s = SdlOpen(SDL_INIT_VIDEO);
+	if (s != NULL) return s;
+
+	GetVideoModes();
+	if (!CreateMainSurface(_cur_resolution.width, _cur_resolution.height)) {
+		return SDL_CALL SDL_GetError();
+	}
+
+	SDL_CALL SDL_VideoDriverName(buf, sizeof buf);
+	DEBUG(driver, 1, "SDL: using driver '%s'", buf);
+
+	MarkWholeScreenDirty();
+	SetupKeyboard();
+
+	_draw_threaded = GetDriverParam(parm, "no_threads") == NULL && GetDriverParam(parm, "no_thread") == NULL;
+
+	return NULL;
+}
+
+void VideoDriver_SDL::SetupKeyboard()
+{
+	SDL_CALL SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);
+	SDL_CALL SDL_EnableUNICODE(1);
+}
+
+void VideoDriver_SDL::Stop()
+{
+	SdlClose(SDL_INIT_VIDEO);
+}
+
+void VideoDriver_SDL::MainLoop()
+{
+	uint32 cur_ticks = SDL_CALL SDL_GetTicks();
+	uint32 last_cur_ticks = cur_ticks;
+	uint32 next_tick = cur_ticks + MILLISECONDS_PER_TICK;
+	uint32 mod;
+	int numkeys;
+	Uint8 *keys;
+
+	CheckPaletteAnim();
+
+	if (_draw_threaded) {
+		/* Initialise the mutex first, because that's the thing we *need*
+		 * directly in the newly created thread. */
+		_draw_mutex = ThreadMutex::New();
+		if (_draw_mutex == NULL) {
+			_draw_threaded = false;
+		} else {
+			_draw_mutex->BeginCritical();
+			_draw_continue = true;
+
+			_draw_threaded = ThreadObject::New(&DrawSurfaceToScreenThread, NULL, &_draw_thread);
+
+			/* Free the mutex if we won't be able to use it. */
+			if (!_draw_threaded) {
+				_draw_mutex->EndCritical();
+				delete _draw_mutex;
+				_draw_mutex = NULL;
+			} else {
+				/* Wait till the draw mutex has started itself. */
+				_draw_mutex->WaitForSignal();
+			}
+		}
+	}
+
+	DEBUG(driver, 1, "SDL: using %sthreads", _draw_threaded ? "" : "no ");
+
+	for (;;) {
+		uint32 prev_cur_ticks = cur_ticks; // to check for wrapping
+		InteractiveRandom(); // randomness
+
+		while (PollEvent() == -1) {}
+		if (_exit_game) break;
+
+		mod = SDL_CALL SDL_GetModState();
+#if SDL_VERSION_ATLEAST(1, 3, 0)
+		keys = SDL_CALL SDL_GetKeyboardState(&numkeys);
+#else
+		keys = SDL_CALL SDL_GetKeyState(&numkeys);
+#endif
+#if defined(_DEBUG)
+		if (_shift_pressed)
+#else
+		/* Speedup when pressing tab, except when using ALT+TAB
+		 * to switch to another application */
+#if SDL_VERSION_ATLEAST(1, 3, 0)
+		if (keys[SDL_SCANCODE_TAB] && (mod & KMOD_ALT) == 0)
+#else
+		if (keys[SDLK_TAB] && (mod & KMOD_ALT) == 0)
+#endif /* SDL_VERSION_ATLEAST(1, 3, 0) */
+#endif /* defined(_DEBUG) */
+		{
+			if (!_networking && _game_mode != GM_MENU) _fast_forward |= 2;
+		} else if (_fast_forward & 2) {
+			_fast_forward = 0;
+		}
+
+		cur_ticks = SDL_CALL SDL_GetTicks();
+		if (cur_ticks >= next_tick || (_fast_forward && !_pause_mode) || cur_ticks < prev_cur_ticks) {
+			_realtime_tick += cur_ticks - last_cur_ticks;
+			last_cur_ticks = cur_ticks;
+			next_tick = cur_ticks + MILLISECONDS_PER_TICK;
+
+			bool old_ctrl_pressed = _ctrl_pressed;
+
+			_ctrl_pressed  = !!(mod & KMOD_CTRL);
+			_shift_pressed = !!(mod & KMOD_SHIFT);
+
+			/* determine which directional keys are down */
+			_dirkeys =
+#if SDL_VERSION_ATLEAST(1, 3, 0)
+				(keys[SDL_SCANCODE_LEFT]  ? 1 : 0) |
+				(keys[SDL_SCANCODE_UP]    ? 2 : 0) |
+				(keys[SDL_SCANCODE_RIGHT] ? 4 : 0) |
+				(keys[SDL_SCANCODE_DOWN]  ? 8 : 0);
+#else
+				(keys[SDLK_LEFT]  ? 1 : 0) |
+				(keys[SDLK_UP]    ? 2 : 0) |
+				(keys[SDLK_RIGHT] ? 4 : 0) |
+				(keys[SDLK_DOWN]  ? 8 : 0);
+#endif
+			if (old_ctrl_pressed != _ctrl_pressed) HandleCtrlChanged();
+
+			/* The gameloop is the part that can run asynchronously. The rest
+			 * except sleeping can't. */
+			if (_draw_mutex != NULL) _draw_mutex->EndCritical();
+
+			GameLoop();
+
+			if (_draw_mutex != NULL) _draw_mutex->BeginCritical();
+
+			UpdateWindows();
+			_local_palette = _cur_palette;
+		} else {
+			/* Release the thread while sleeping */
+			if (_draw_mutex != NULL) _draw_mutex->EndCritical();
+			CSleep(1);
+			if (_draw_mutex != NULL) _draw_mutex->BeginCritical();
+
+			NetworkDrawChatMessage();
+			DrawMouseCursor();
+		}
+
+		/* End of the critical part. */
+		if (_draw_mutex != NULL && !HasModalProgress()) {
+			_draw_mutex->SendSignal();
+		} else {
+			/* Oh, we didn't have threads, then just draw unthreaded */
+			CheckPaletteAnim();
+			DrawSurfaceToScreen();
+		}
+	}
+
+	if (_draw_mutex != NULL) {
+		_draw_continue = false;
+		/* Sending signal if there is no thread blocked
+		 * is very valid and results in noop */
+		_draw_mutex->SendSignal();
+		_draw_mutex->EndCritical();
+		_draw_thread->Join();
+
+		delete _draw_mutex;
+		delete _draw_thread;
+
+		_draw_mutex = NULL;
+		_draw_thread = NULL;
+	}
+}
+
+bool VideoDriver_SDL::ChangeResolution(int w, int h)
+{
+	if (_draw_mutex != NULL) _draw_mutex->BeginCritical(true);
+	bool ret = CreateMainSurface(w, h);
+	if (_draw_mutex != NULL) _draw_mutex->EndCritical(true);
+	return ret;
+}
+
+bool VideoDriver_SDL::ToggleFullscreen(bool fullscreen)
+{
+	if (_draw_mutex != NULL) _draw_mutex->BeginCritical(true);
+	_fullscreen = fullscreen;
+	GetVideoModes(); // get the list of available video modes
+	bool ret = _num_resolutions != 0 && CreateMainSurface(_cur_resolution.width, _cur_resolution.height);
+
+	if (!ret) {
+		/* switching resolution failed, put back full_screen to original status */
+		_fullscreen ^= true;
+	}
+
+	if (_draw_mutex != NULL) _draw_mutex->EndCritical(true);
+	return ret;
+}
+
+bool VideoDriver_SDL::AfterBlitterChange()
+{
+	if (_draw_mutex != NULL) _draw_mutex->BeginCritical(true);
+	bool ret = CreateMainSurface(_screen.width, _screen.height);
+	if (_draw_mutex != NULL) _draw_mutex->EndCritical(true);
+	return ret;
+}
+
+#endif /* WITH_SDL */