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/*
* 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: {
blitter->PaletteAnimate(this->local_palette);
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 = {};
}
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;
}
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