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/* SPDX-License-Identifier: GPL-2.0-or-later
* Mode switching
* Copyright 1997-2001 Id Software, Inc.
* Copyright 1993-2011 Tim Riker
* Copyright 2012 Alex Fraser */
/** \file
* \ingroup GHOST
*/
#include "GHOST_DisplayManagerSDL.h"
#include "GHOST_SystemSDL.h"
#include "GHOST_WindowManager.h"
GHOST_DisplayManagerSDL::GHOST_DisplayManagerSDL(GHOST_SystemSDL *system)
: GHOST_DisplayManager(), m_system(system)
{
memset(&m_mode, 0, sizeof(m_mode));
}
GHOST_TSuccess GHOST_DisplayManagerSDL::getNumDisplays(uint8_t &numDisplays) const
{
numDisplays = SDL_GetNumVideoDisplays();
return GHOST_kSuccess;
}
GHOST_TSuccess GHOST_DisplayManagerSDL::getNumDisplaySettings(uint8_t display,
int32_t &numSettings) const
{
GHOST_ASSERT(display < 1, "Only single display systems are currently supported.\n");
numSettings = SDL_GetNumDisplayModes(display - 1);
return GHOST_kSuccess;
}
static void ghost_mode_from_sdl(GHOST_DisplaySetting &setting, SDL_DisplayMode *mode)
{
setting.xPixels = mode->w;
setting.yPixels = mode->h;
setting.bpp = SDL_BYTESPERPIXEL(mode->format) * 8;
/* Just guess the frequency :( */
setting.frequency = mode->refresh_rate ? mode->refresh_rate : 60;
}
static void ghost_mode_to_sdl(const GHOST_DisplaySetting &setting, SDL_DisplayMode *mode)
{
mode->w = setting.xPixels;
mode->h = setting.yPixels;
// setting.bpp = SDL_BYTESPERPIXEL(mode->format) * 8; ???
mode->refresh_rate = setting.frequency;
}
GHOST_TSuccess GHOST_DisplayManagerSDL::getDisplaySetting(uint8_t display,
int32_t index,
GHOST_DisplaySetting &setting) const
{
GHOST_ASSERT(display < 1, "Only single display systems are currently supported.\n");
SDL_DisplayMode mode;
SDL_GetDisplayMode(display, index, &mode);
ghost_mode_from_sdl(setting, &mode);
return GHOST_kSuccess;
}
GHOST_TSuccess GHOST_DisplayManagerSDL::getCurrentDisplaySetting(
uint8_t display, GHOST_DisplaySetting &setting) const
{
SDL_DisplayMode mode;
SDL_GetCurrentDisplayMode(display, &mode);
ghost_mode_from_sdl(setting, &mode);
return GHOST_kSuccess;
}
GHOST_TSuccess GHOST_DisplayManagerSDL::getCurrentDisplayModeSDL(SDL_DisplayMode &mode) const
{
mode = m_mode;
return GHOST_kSuccess;
}
GHOST_TSuccess GHOST_DisplayManagerSDL::setCurrentDisplaySetting(
uint8_t display, const GHOST_DisplaySetting &setting)
{
/*
* Mode switching code ported from Quake 2 version 3.21 and BZFLAG version 2.4.0:
* ftp://ftp.idsoftware.com/idstuff/source/q2source-3.21.zip
* See linux/gl_glx.c:GLimp_SetMode
* http://wiki.bzflag.org/BZFlag_Source
* See: `src/platform/SDLDisplay.cxx:SDLDisplay` and `createWindow`.
*/
SDL_DisplayMode mode;
const int num_modes = SDL_GetNumDisplayModes(display);
int best_fit, best_dist, dist, x, y;
best_dist = 9999999;
best_fit = -1;
if (num_modes == 0) {
/* Any mode is OK. */
ghost_mode_to_sdl(setting, &mode);
}
else {
for (int i = 0; i < num_modes; i++) {
SDL_GetDisplayMode(display, i, &mode);
if (setting.xPixels > mode.w || setting.yPixels > mode.h) {
continue;
}
x = setting.xPixels - mode.w;
y = setting.yPixels - mode.h;
dist = (x * x) + (y * y);
if (dist < best_dist) {
best_dist = dist;
best_fit = i;
}
}
if (best_fit == -1)
return GHOST_kFailure;
SDL_GetDisplayMode(display, best_fit, &mode);
}
m_mode = mode;
/* evil, SDL2 needs a window to adjust display modes */
GHOST_WindowSDL *win = (GHOST_WindowSDL *)m_system->getWindowManager()->getActiveWindow();
if (win) {
SDL_Window *sdl_win = win->getSDLWindow();
SDL_SetWindowDisplayMode(sdl_win, &mode);
SDL_ShowWindow(sdl_win);
SDL_SetWindowFullscreen(sdl_win, SDL_TRUE);
return GHOST_kSuccess;
}
else {
/* this is a problem for the BGE player :S, perhaps SDL2 will resolve at some point.
* we really need SDL_SetDisplayModeForDisplay() to become an API func! - campbell */
printf("no windows available, can't fullscreen\n");
/* do not fail, we will try again later when the window is created - wander */
return GHOST_kSuccess;
}
}
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