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/*
* Copyright 2010-2013 OpenXcom Developers.
*
* This file is part of OpenXcom.
*
* OpenXcom 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 3 of the License, or
* (at your option) any later version.
*
* OpenXcom 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 OpenXcom. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Screen.h"
#include <sstream>
#include <cmath>
#include <iomanip>
#include <limits.h>
#include "../lodepng.h"
#include "Exception.h"
#include "Surface.h"
#include "Logger.h"
#include "Action.h"
#include "Options.h"
#include "CrossPlatform.h"
#include "Zoom.h"
#include "OpenGL.h"
#include "Timer.h"
#include <SDL.h>
namespace OpenXcom
{
const int Screen::ORIGINAL_WIDTH = 320;
const int Screen::ORIGINAL_HEIGHT = 200;
/**
* Sets up all the internal display flags depending on
* the current video settings.
*/
void Screen::makeVideoFlags()
{
_flags = SDL_HWSURFACE|SDL_DOUBLEBUF|SDL_HWPALETTE;
if (Options::asyncBlit)
{
_flags |= SDL_ASYNCBLIT;
}
if (isOpenGLEnabled())
{
_flags = SDL_OPENGL;
SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
}
if (Options::allowResize)
{
_flags |= SDL_RESIZABLE;
}
// Handle window positioning
if (Options::windowedModePositionX != -1 || Options::windowedModePositionY != -1)
{
std::ostringstream ss;
ss << "SDL_VIDEO_WINDOW_POS=" << std::dec << Options::windowedModePositionX << "," << Options::windowedModePositionY;
SDL_putenv(const_cast<char*>(ss.str().c_str()));
SDL_putenv(const_cast<char*>("SDL_VIDEO_CENTERED="));
}
else if (Options::borderless)
{
SDL_putenv(const_cast<char*>("SDL_VIDEO_WINDOW_POS="));
SDL_putenv(const_cast<char*>("SDL_VIDEO_CENTERED=center"));
}
else
{
SDL_putenv(const_cast<char*>("SDL_VIDEO_WINDOW_POS="));
SDL_putenv(const_cast<char*>("SDL_VIDEO_CENTERED="));
}
// Handle display mode
if (Options::fullscreen)
{
_flags |= SDL_FULLSCREEN;
}
if (Options::borderless)
{
_flags |= SDL_NOFRAME;
SDL_putenv(const_cast<char*>("SDL_VIDEO_CENTERED=center"));
}
else
{
SDL_putenv(const_cast<char*>("SDL_VIDEO_CENTERED="));
}
_bpp = (isHQXEnabled() || isOpenGLEnabled()) ? 32 : 8;
_baseWidth = Options::baseXResolution;
_baseHeight = Options::baseYResolution;
}
/**
* Initializes a new display screen for the game to render contents to.
* The screen is set up based on the current options.
*/
Screen::Screen() : _baseWidth(ORIGINAL_WIDTH), _baseHeight(ORIGINAL_HEIGHT), _scaleX(1.0), _scaleY(1.0), _numColors(0), _firstColor(0), _pushPalette(false), _surface(0)
{
resetDisplay();
memset(deferredPalette, 0, 256*sizeof(SDL_Color));
}
/**
* Deletes the buffer from memory. The display screen itself
* is automatically freed once SDL shuts down.
*/
Screen::~Screen()
{
delete _surface;
}
/**
* Returns the screen's internal buffer surface. Any
* contents that need to be shown will be blitted to this.
* @return Pointer to the buffer surface.
*/
Surface *Screen::getSurface()
{
_pushPalette = true;
return _surface;
}
/**
* Handles screen key shortcuts.
* @param action Pointer to an action.
*/
void Screen::handle(Action *action)
{
if (Options::debug)
{
if (action->getDetails()->type == SDL_KEYDOWN && action->getDetails()->key.keysym.sym == SDLK_F8)
{
switch(Timer::gameSlowSpeed)
{
case 1: Timer::gameSlowSpeed = 5; break;
case 5: Timer::gameSlowSpeed = 15; break;
default: Timer::gameSlowSpeed = 1; break;
}
}
}
if (action->getDetails()->type == SDL_KEYDOWN && action->getDetails()->key.keysym.sym == SDLK_RETURN && (SDL_GetModState() & KMOD_ALT) != 0)
{
Options::fullscreen = !Options::fullscreen;
resetDisplay();
}
else if (action->getDetails()->type == SDL_KEYDOWN && action->getDetails()->key.keysym.sym == Options::keyScreenshot)
{
std::ostringstream ss;
int i = 0;
do
{
ss.str("");
ss << Options::getUserFolder() << "screen" << std::setfill('0') << std::setw(3) << i << ".png";
i++;
}
while (CrossPlatform::fileExists(ss.str()));
screenshot(ss.str());
return;
}
}
/**
* Renders the buffer's contents onto the screen, applying
* any necessary filters or conversions in the process.
* If the scaling factor is bigger than 1, the entire contents
* of the buffer are resized by that factor (eg. 2 = doubled)
* before being put on screen.
*/
void Screen::flip()
{
if (getWidth() != _baseWidth || getHeight() != _baseHeight || isOpenGLEnabled())
{
Zoom::flipWithZoom(_surface->getSurface(), _screen, _topBlackBand, _bottomBlackBand, _leftBlackBand, _rightBlackBand, &glOutput);
}
else
{
SDL_BlitSurface(_surface->getSurface(), 0, _screen, 0);
}
// perform any requested palette update
if (_pushPalette && _numColors && _screen->format->BitsPerPixel == 8)
{
if (_screen->format->BitsPerPixel == 8 && SDL_SetColors(_screen, &(deferredPalette[_firstColor]), _firstColor, _numColors) == 0)
{
Log(LOG_DEBUG) << "Display palette doesn't match requested palette";
}
_numColors = 0;
_pushPalette = false;
}
if (SDL_Flip(_screen) == -1)
{
throw Exception(SDL_GetError());
}
}
/**
* Clears all the contents out of the internal buffer.
*/
void Screen::clear()
{
_surface->clear();
}
/**
* Changes the 8bpp palette used to render the screen's contents.
* @param colors Pointer to the set of colors.
* @param firstcolor Offset of the first color to replace.
* @param ncolors Amount of colors to replace.
* @param immediately Apply palette changes immediately, otherwise wait for next blit.
*/
void Screen::setPalette(SDL_Color* colors, int firstcolor, int ncolors, bool immediately)
{
if (_numColors && (_numColors != ncolors) && (_firstColor != firstcolor))
{
// an initial palette setup has not been comitted to the screen yet
// just update it with whatever colors are being sent now
memmove(&(deferredPalette[firstcolor]), colors, sizeof(SDL_Color)*ncolors);
_numColors = 256; // all the use cases are just a full palette with 16-color follow-ups
_firstColor = 0;
} else
{
memmove(&(deferredPalette[firstcolor]), colors, sizeof(SDL_Color) * ncolors);
_numColors = ncolors;
_firstColor = firstcolor;
}
_surface->setPalette(colors, firstcolor, ncolors);
// defer actual update of screen until SDL_Flip()
if (immediately && _screen->format->BitsPerPixel == 8 && SDL_SetColors(_screen, colors, firstcolor, ncolors) == 0)
{
Log(LOG_DEBUG) << "Display palette doesn't match requested palette";
}
// Sanity check
/*
SDL_Color *newcolors = _screen->format->palette->colors;
for (int i = firstcolor, j = 0; i < firstcolor + ncolors; i++, j++)
{
Log(LOG_DEBUG) << (int)newcolors[i].r << " - " << (int)newcolors[i].g << " - " << (int)newcolors[i].b;
Log(LOG_DEBUG) << (int)colors[j].r << " + " << (int)colors[j].g << " + " << (int)colors[j].b;
if (newcolors[i].r != colors[j].r ||
newcolors[i].g != colors[j].g ||
newcolors[i].b != colors[j].b)
{
Log(LOG_ERROR) << "Display palette doesn't match requested palette";
break;
}
}
*/
}
/**
* Returns the screen's 8bpp palette.
* @return Pointer to the palette's colors.
*/
SDL_Color *Screen::getPalette() const
{
return (SDL_Color*)deferredPalette;
}
/**
* Returns the width of the screen.
* @return Width in pixels.
*/
int Screen::getWidth() const
{
return _screen->w;
}
/**
* Returns the height of the screen.
* @return Height in pixels
*/
int Screen::getHeight() const
{
return _screen->h;
}
/**
* Resets the screen surfaces based on the current display options,
* as they don't automatically take effect.
*/
void Screen::resetDisplay(bool resetVideo)
{
int width = Options::displayWidth;
int height = Options::displayHeight;
makeVideoFlags();
if (!_surface || (_surface &&
(_surface->getSurface()->format->BitsPerPixel != _bpp ||
_surface->getSurface()->w != _baseWidth ||
_surface->getSurface()->h != _baseHeight))) // don't reallocate _surface if not necessary, it's a waste of CPU cycles
{
if (_surface) delete _surface;
_surface = new Surface(_baseWidth, _baseHeight, 0, 0, Screen::isHQXEnabled() ? 32 : 8); // only HQX needs 32bpp for this surface; the OpenGL class has its own 32bpp buffer
if (_surface->getSurface()->format->BitsPerPixel == 8) _surface->setPalette(deferredPalette);
}
SDL_SetColorKey(_surface->getSurface(), 0, 0); // turn off color key!
if (resetVideo)
{
Log(LOG_INFO) << "Attempting to set display to " << width << "x" << height << "x" << _bpp << "...";
_screen = SDL_SetVideoMode(width, height, _bpp, _flags);
if (_screen == 0)
{
Log(LOG_ERROR) << SDL_GetError();
Log(LOG_INFO) << "Attempting to set display to default resolution...";
_screen = SDL_SetVideoMode(640, 400, _bpp, _flags);
if (_screen == 0)
{
throw Exception(SDL_GetError());
}
}
}
Options::displayWidth = getWidth();
Options::displayHeight = getHeight();
_scaleX = getWidth() / (double)_baseWidth;
_scaleY = getHeight() / (double)_baseHeight;
bool cursorInBlackBands;
if (!Options::keepAspectRatio)
{
cursorInBlackBands = false;
}
else if (Options::fullscreen)
{
cursorInBlackBands = Options::cursorInBlackBandsInFullscreen;
}
else if (!Options::borderless)
{
cursorInBlackBands = Options::cursorInBlackBandsInWindow;
}
else
{
cursorInBlackBands = Options::cursorInBlackBandsInBorderlessWindow;
}
if (_scaleX > _scaleY && Options::keepAspectRatio)
{
int targetWidth = floor(_scaleY * (double)_baseWidth);
_topBlackBand = _bottomBlackBand = 0;
_leftBlackBand = (getWidth() - targetWidth) / 2;
if (_leftBlackBand < 0)
{
_leftBlackBand = 0;
}
_rightBlackBand = getWidth() - targetWidth - _leftBlackBand;
_cursorTopBlackBand = 0;
if (cursorInBlackBands)
{
_scaleX = _scaleY;
_cursorLeftBlackBand = _leftBlackBand;
}
else
{
_cursorLeftBlackBand = 0;
}
}
else if (_scaleY > _scaleX && Options::keepAspectRatio)
{
int targetHeight = floor(_scaleX * (double)_baseHeight);
_topBlackBand = (getHeight() - targetHeight) / 2;
if (_topBlackBand < 0)
{
_topBlackBand = 0;
}
_bottomBlackBand = getHeight() - targetHeight - _topBlackBand;
_leftBlackBand = _rightBlackBand = 0;
_cursorLeftBlackBand = 0;
if (cursorInBlackBands)
{
_scaleY = _scaleX;
_cursorTopBlackBand = _topBlackBand;
}
else
{
_cursorTopBlackBand = 0;
}
}
else
{
_topBlackBand = _bottomBlackBand = _leftBlackBand = _rightBlackBand = _cursorTopBlackBand = _cursorLeftBlackBand = 0;
}
if (isOpenGLEnabled())
{
#ifndef __NO_OPENGL
glOutput.init(_baseWidth, _baseHeight);
glOutput.linear = Options::useOpenGLSmoothing; // setting from shader file will override this, though
glOutput.set_shader(CrossPlatform::getDataFile(Options::useOpenGLShader).c_str());
glOutput.setVSync(Options::vSyncForOpenGL);
OpenGL::checkErrors = Options::checkOpenGLErrors;
#endif
}
if (resetVideo)
{
Log(LOG_INFO) << "Display set to " << getWidth() << "x" << getHeight() << "x" << (int)_screen->format->BitsPerPixel << ".";
if (_screen->format->BitsPerPixel == 8)
{
setPalette(getPalette());
}
}
}
/**
* Returns the screen's X scale.
* @return Scale factor.
*/
double Screen::getXScale() const
{
return _scaleX;
}
/**
* Returns the screen's Y scale.
* @return Scale factor.
*/
double Screen::getYScale() const
{
return _scaleY;
}
/**
* Returns the screen's top black forbidden to cursor band's height.
* @return Height in pixel.
*/
int Screen::getCursorTopBlackBand() const
{
return _cursorTopBlackBand;
}
/**
* Returns the screen's left black forbidden to cursor band's width.
* @return Width in pixel.
*/
int Screen::getCursorLeftBlackBand() const
{
return _cursorLeftBlackBand;
}
/**
* Saves a screenshot of the screen's contents.
* @param filename Filename of the PNG file.
*/
void Screen::screenshot(const std::string &filename) const
{
SDL_Surface *screenshot = SDL_AllocSurface(0, getWidth() - getWidth()%4, getHeight(), 24, 0xff, 0xff00, 0xff0000, 0);
if (isOpenGLEnabled())
{
#ifndef __NO_OPENGL
GLenum format = GL_RGB;
for (int y = 0; y < getHeight(); ++y)
{
glReadPixels(0, getHeight()-(y+1), getWidth() - getWidth()%4, 1, format, GL_UNSIGNED_BYTE, ((Uint8*)screenshot->pixels) + y*screenshot->pitch);
}
glErrorCheck();
#endif
}
else
{
SDL_BlitSurface(_screen, 0, screenshot, 0);
}
unsigned error = lodepng::encode(filename, (const unsigned char *)(screenshot->pixels), getWidth() - getWidth()%4, getHeight(), LCT_RGB);
if (error)
{
Log(LOG_ERROR) << "Saving to PNG failed: " << lodepng_error_text(error);
}
SDL_FreeSurface(screenshot);
}
/** Check whether useHQXFilter is set in Options and a compatible resolution
* has been selected.
*/
bool Screen::isHQXEnabled()
{
int w = Options::displayWidth;
int h = Options::displayHeight;
int baseW = Options::baseXResolution;
int baseH = Options::baseYResolution;
if (Options::useHQXFilter && (
(w == baseW * 2 && h == baseH * 2) ||
(w == baseW * 3 && h == baseH * 3) ||
(w == baseW * 4 && h == baseH * 4)))
{
return true;
}
return false;
}
/**
* Check if openGl is enabled.
* @return if it is enabled.
*/
bool Screen::isOpenGLEnabled()
{
#ifdef __NO_OPENGL
return false;
#else
return Options::useOpenGL;
#endif
}
/**
* Gets the Horizontal offset from the mid-point of the screen, in pixels.
* @return the horizontal offset.
*/
int Screen::getDX()
{
return (_baseWidth - ORIGINAL_WIDTH) / 2;
}
/**
* Gets the Vertical offset from the mid-point of the screen, in pixels.
* @return the vertical offset.
*/
int Screen::getDY()
{
return (_baseHeight - ORIGINAL_HEIGHT) / 2;
}
}