1 files changed, 199 insertions, 0 deletions
diff --git a/src/video/sdl2_default_v.cpp b/src/video/sdl2_default_v.cpp
new file mode 100644
index 000000000..b8e769ede
--- /dev/null
+++ b/src/video/sdl2_default_v.cpp
@@ -0,0 +1,199 @@
+/*
+ * 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 sdl2_default_v.cpp Implementation of the default backend for SDL2 video driver. */
+
+#include "../stdafx.h"
+#include "../openttd.h"
+#include "../gfx_func.h"
+#include "../rev.h"
+#include "../blitter/factory.hpp"
+#include "../network/network.h"
+#include "../thread.h"
+#include "../progress.h"
+#include "../core/random_func.hpp"
+#include "../core/math_func.hpp"
+#include "../core/mem_func.hpp"
+#include "../core/geometry_func.hpp"
+#include "../fileio_func.h"
+#include "../framerate_type.h"
+#include "../window_func.h"
+#include "sdl2_default_v.h"
+#include <SDL.h>
+#include <mutex>
+#include <condition_variable>
+#ifdef __EMSCRIPTEN__
+#	include <emscripten.h>
+#	include <emscripten/html5.h>
+#endif
+
+#include "../safeguards.h"
+
+static FVideoDriver_SDL_Default iFVideoDriver_SDL_Default;
+
+static SDL_Surface *_sdl_surface;
+static SDL_Surface *_sdl_rgb_surface;
+static SDL_Surface *_sdl_real_surface;
+static SDL_Palette *_sdl_palette;
+
+void VideoDriver_SDL_Default::UpdatePalette()
+{
+	SDL_Color pal[256];
+
+	for (int i = 0; i != this->local_palette.count_dirty; i++) {
+		pal[i].r = this->local_palette.palette[this->local_palette.first_dirty + i].r;
+		pal[i].g = this->local_palette.palette[this->local_palette.first_dirty + i].g;
+		pal[i].b = this->local_palette.palette[this->local_palette.first_dirty + i].b;
+		pal[i].a = 0;
+	}
+
+	SDL_SetPaletteColors(_sdl_palette, pal, this->local_palette.first_dirty, this->local_palette.count_dirty);
+	SDL_SetSurfacePalette(_sdl_surface, _sdl_palette);
+}
+
+void VideoDriver_SDL_Default::MakePalette()
+{
+	if (_sdl_palette == nullptr) {
+		_sdl_palette = SDL_AllocPalette(256);
+		if (_sdl_palette == nullptr) usererror("SDL2: Couldn't allocate palette: %s", SDL_GetError());
+	}
+
+	_cur_palette.first_dirty = 0;
+	_cur_palette.count_dirty = 256;
+	this->local_palette = _cur_palette;
+	this->UpdatePalette();
+
+	if (_sdl_surface != _sdl_real_surface) {
+		/* When using a shadow surface, also set our palette on the real screen. This lets SDL
+		 * allocate as many 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_SetSurfacePalette(_sdl_real_surface, _sdl_palette);
+	}
+}
+
+void VideoDriver_SDL_Default::Paint()
+{
+	PerformanceMeasurer framerate(PFE_VIDEO);
+
+	if (IsEmptyRect(this->dirty_rect) && _cur_palette.count_dirty == 0) return;
+
+	if (_cur_palette.count_dirty != 0) {
+		Blitter *blitter = BlitterFactory::GetCurrentBlitter();
+
+		switch (blitter->UsePaletteAnimation()) {
+			case Blitter::PALETTE_ANIMATION_VIDEO_BACKEND:
+				this->UpdatePalette();
+				break;
+
+			case Blitter::PALETTE_ANIMATION_BLITTER: {
+				bool need_buf = _screen.dst_ptr == nullptr;
+				if (need_buf) _screen.dst_ptr = this->GetVideoPointer();
+				blitter->PaletteAnimate(this->local_palette);
+				if (need_buf) {
+					this->ReleaseVideoPointer();
+					_screen.dst_ptr = nullptr;
+				}
+				break;
+			}
+
+			case Blitter::PALETTE_ANIMATION_NONE:
+				break;
+
+			default:
+				NOT_REACHED();
+		}
+		_cur_palette.count_dirty = 0;
+	}
+
+	SDL_Rect r = { this->dirty_rect.left, this->dirty_rect.top, this->dirty_rect.right - this->dirty_rect.left, this->dirty_rect.bottom - this->dirty_rect.top };
+
+	if (_sdl_surface != _sdl_real_surface) {
+		SDL_BlitSurface(_sdl_surface, &r, _sdl_real_surface, &r);
+	}
+	SDL_UpdateWindowSurfaceRects(this->sdl_window, &r, 1);
+
+	this->dirty_rect = {};
+}
+
+void VideoDriver_SDL_Default::PaintThread()
+{
+	/* First tell the main thread we're started */
+	std::unique_lock<std::recursive_mutex> lock(*this->draw_mutex);
+	this->draw_signal->notify_one();
+
+	/* Now wait for the first thing to draw! */
+	this->draw_signal->wait(*this->draw_mutex);
+
+	while (this->draw_continue) {
+		/* Then just draw and wait till we stop */
+		this->Paint();
+		this->draw_signal->wait(lock);
+	}
+}
+
+bool VideoDriver_SDL_Default::AllocateBackingStore(int w, int h, bool force)
+{
+	int bpp = BlitterFactory::GetCurrentBlitter()->GetScreenDepth();
+
+	_sdl_real_surface = SDL_GetWindowSurface(this->sdl_window);
+	if (_sdl_real_surface == nullptr) usererror("SDL2: Couldn't get window surface: %s", SDL_GetError());
+
+	if (!force && w == _sdl_real_surface->w && h == _sdl_real_surface->h) return false;
+
+	/* Free any previously allocated rgb surface. */
+	if (_sdl_rgb_surface != nullptr) {
+		SDL_FreeSurface(_sdl_rgb_surface);
+		_sdl_rgb_surface = nullptr;
+	}
+
+	if (bpp == 8) {
+		_sdl_rgb_surface = SDL_CreateRGBSurface(0, w, h, 8, 0, 0, 0, 0);
+		if (_sdl_rgb_surface == nullptr) usererror("SDL2: Couldn't allocate shadow surface: %s", SDL_GetError());
+
+		_sdl_surface = _sdl_rgb_surface;
+	} else {
+		_sdl_surface = _sdl_real_surface;
+	}
+
+	/* X11 doesn't appreciate it if we invalidate areas outside the window
+	 * if shared memory is enabled (read: it crashes). So, as we might have
+	 * gotten smaller, reset our dirty rects. GameSizeChanged() a bit lower
+	 * will mark the whole screen dirty again anyway, but this time with the
+	 * new dimensions. */
+	this->dirty_rect = {};
+
+	_screen.width = _sdl_surface->w;
+	_screen.height = _sdl_surface->h;
+	_screen.pitch = _sdl_surface->pitch / (bpp / 8);
+	_screen.dst_ptr = this->GetVideoPointer();
+
+	this->MakePalette();
+
+	return true;
+}
+
+void *VideoDriver_SDL_Default::GetVideoPointer()
+{
+	return _sdl_surface->pixels;
+}