love/src/modules/window/sdl/Window.cpp

/**
 * Copyright (c) 2006-2012 LOVE Development Team
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 **/

// STL
#include <iostream>

// SDL
#include <SDL.h>

// OpenGL
#include <SDL/SDL_opengl.h>

// LOVE
#include "common/config.h"
#include "Window.h"

namespace love
{
namespace window
{
namespace sdl
{

Window::Window()
	: windowTitle("")
	, created(false)
	, mouseVisible(true)
{
	// Window should be centered.
	SDL_putenv(const_cast<char *>("SDL_VIDEO_CENTERED=center"));

	if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0)
		throw Exception(SDL_GetError());
}

Window::~Window()
{
	SDL_QuitSubSystem(SDL_INIT_VIDEO);
}

Window::_currentMode::_currentMode()
	: width(800), height(600), fullscreen(false), vsync(true), fsaa(0)
{
}

bool Window::setWindow(int width, int height, bool fullscreen, bool vsync, int fsaa)
{
	bool mouseVisible = getMouseVisible();
	int keyrepeatDelay, keyrepeatInterval;
	SDL_GetKeyRepeat(&keyrepeatDelay, &keyrepeatInterval);

	// We need to restart the subsystem for two reasons:
	// 1) Special case for fullscreen -> windowed. Windows XP did not
	//    work well with "normal" display mode change in this case.
	//    The application window does leave fullscreen, but the desktop
	//    resolution does not revert to the correct one. Restarting the
	//    SDL video subsystem does the trick, though.
	// 2) Restart the event system (for whatever reason the event system
	//    started and stopped with SDL_INIT_VIDEO, see:
	//    http://sdl.beuc.net/sdl.wiki/Introduction_to_Events)
	//    because the mouse position will not be able to exceed
	//    the previous' video mode window size (i.e. alway
	//    love.mouse.getX() < 800 when switching from 800x600 to a
	//    higher resolution)
	SDL_QuitSubSystem(SDL_INIT_VIDEO);
	if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0)
	{
		std::cout << "Could not init SDL_VIDEO: " << SDL_GetError() << std::endl;
		return false;
	}

	// Set caption.
	setWindowTitle(windowTitle);
	setMouseVisible(mouseVisible);
	SDL_EnableKeyRepeat(keyrepeatDelay, keyrepeatInterval);

	// Set GL attributes
	SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
	SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, (vsync ? 1 : 0));
	SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 1);

	// FSAA
	if (fsaa > 0)
	{
		SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
		SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, fsaa);
	}

	// Fullscreen?
	Uint32 sdlflags = fullscreen ? (SDL_OPENGL | SDL_FULLSCREEN) : SDL_OPENGL;

	// Have SDL set the video mode.
	if (SDL_SetVideoMode(width, height, 32, sdlflags) == 0)
	{
		bool failed = true;
		if (fsaa > 0)
		{
			// FSAA might have failed, disable it and try again
			SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 0);
			failed = SDL_SetVideoMode(width, height, 32, sdlflags) == 0;
			if (failed)
			{
				// There might be no FSAA at all
				SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 0);
				failed = SDL_SetVideoMode(width, height, 32, sdlflags) == 0;
			}
		}
		if (failed)
		{
			std::cerr << "Could not set video mode: "  << SDL_GetError() << std::endl;
			return false;
		}
	}

	created = true;

	if (width == 0 || height == 0)
	{
		const SDL_VideoInfo *videoinfo = SDL_GetVideoInfo();
		width = videoinfo->current_w;
		height = videoinfo->current_h;
	}

	if (fsaa > 0)
		glEnable(GL_MULTISAMPLE);

	GLint buffers;
	GLint samples;

	glGetIntegerv(GL_SAMPLE_BUFFERS_ARB, &buffers);
	glGetIntegerv(GL_SAMPLES_ARB, &samples);

	// Don't fail because of this, but issue a warning.
	if ((!buffers && fsaa) || (samples != fsaa))
	{
		std::cerr << "Warning, quality setting failed! (Result: buffers: " << buffers << ", samples: " << samples << ")" << std::endl;
		fsaa = !buffers ? 0 : samples;
	}

	// Get the actual vsync status
	int real_vsync;
	SDL_GL_GetAttribute(SDL_GL_SWAP_CONTROL, &real_vsync);

	// Set the new display mode as the current display mode.
	currentMode.width = width;
	currentMode.height = height;
	currentMode.fsaa = fsaa;
	currentMode.fullscreen = fullscreen;
	currentMode.vsync = (real_vsync != 0);

	return true;
}

void Window::getWindow(int &width, int &height, bool &fullscreen, bool &vsync, int &fsaa)
{
	width = currentMode.width;
	height = currentMode.height;
	fullscreen = currentMode.fullscreen;
	vsync = currentMode.vsync;
	fsaa = currentMode.fsaa;
}

bool Window::checkWindowSize(int width, int height, bool fullscreen)
{
	Uint32 sdlflags = fullscreen ? (SDL_OPENGL | SDL_FULLSCREEN) : SDL_OPENGL;

	// Check if mode is supported
	int bpp = SDL_VideoModeOK(width, height, 32, sdlflags);

	return (bpp >= 16);
}

typedef Window::WindowSize WindowSize;

WindowSize **Window::getFullscreenSizes(int &n)
{
	SDL_Rect **modes = SDL_ListModes(0, SDL_OPENGL | SDL_FULLSCREEN);

	if (modes == (SDL_Rect **)0 || modes == (SDL_Rect **)-1)
	{
		n = 0;
		return NULL;
	}

	n = 0;
	for (int i = 0; modes[i]; i++)
		n++;

	WindowSize **sizes = new WindowSize*[n];

	for (int i = 0; i < n; i++)
	{
		sizes[i] = new WindowSize;
		sizes[i]->width = modes[i]->w;
		sizes[i]->height = modes[i]->h;
	}
	return sizes;
}

int Window::getWidth()
{
	return currentMode.width;
}

int Window::getHeight()
{
	return currentMode.height;
}

bool Window::isCreated()
{
	return created;
}

void Window::setWindowTitle(std::string &title)
{
	windowTitle = title;
	SDL_WM_SetCaption(windowTitle.c_str(), 0);
}

std::string Window::getWindowTitle()
{
	// not a reference
	// because we want this untouched
	// const std::string& might be an option
	return windowTitle;
}

bool Window::setIcon(love::image::ImageData *imgd)
{
	Uint32 rmask, gmask, bmask, amask;
#ifdef LOVE_BIG_ENDIAN
	rmask = 0xFF000000;
	gmask = 0x00FF0000;
	bmask = 0x0000FF00;
	amask = 0x000000FF;
#else
	rmask = 0x000000FF;
	gmask = 0x0000FF00;
	bmask = 0x00FF0000;
	amask = 0xFF000000;
#endif

	int w = static_cast<int>(imgd->getWidth());
	int h = static_cast<int>(imgd->getHeight());
	int pitch = static_cast<int>(imgd->getWidth() * 4);

	SDL_Surface *icon = SDL_CreateRGBSurfaceFrom(imgd->getData(), w, h, 32, pitch, rmask, gmask, bmask, amask);
	SDL_WM_SetIcon(icon, NULL);
	SDL_FreeSurface(icon);
	return true;
}

void Window::swapBuffers()
{
	SDL_GL_SwapBuffers();
}

bool Window::hasFocus()
{
	return (SDL_GetAppState() & SDL_APPINPUTFOCUS) != 0;
}

void Window::setMouseVisible(bool visible)
{
	SDL_ShowCursor(visible ? SDL_ENABLE : SDL_DISABLE);
}

bool Window::getMouseVisible()
{
	return (SDL_ShowCursor(SDL_QUERY) == SDL_ENABLE) ? true : false;
}

love::window::Window *Window::getSingleton()
{
	if (!singleton)
		singleton = new Window();
	else
		singleton->retain();

	return singleton;
}

const char *Window::getName() const
{
	return "love.window.sdl";
}

} // sdl
} // window
} // love