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magnum/src/Magnum/Platform/Sdl2Application.cpp

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/*
This file is part of Magnum.
Copyright © 2010, 2011, 2012, 2013, 2014
Vladimír Vondruš <mosra@centrum.cz>
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include "Sdl2Application.h"
#ifndef CORRADE_TARGET_EMSCRIPTEN
#include <tuple>
#else
#include <emscripten/emscripten.h>
#endif
#include "Magnum/Context.h"
#include "Magnum/Version.h"
#include "Magnum/Platform/ScreenedApplication.hpp"
namespace Magnum { namespace Platform {
namespace {
/*
* Fix up the modifiers -- we want >= operator to work properly on Shift,
* Ctrl, Alt, but SDL generates different event for left / right keys, thus
* (modifiers >= Shift) would pass only if both left and right were pressed,
* which is usually not what the developers wants.
*/
Sdl2Application::InputEvent::Modifiers fixedModifiers(Uint16 mod) {
Sdl2Application::InputEvent::Modifiers modifiers(static_cast<Sdl2Application::InputEvent::Modifier>(mod));
if(modifiers & Sdl2Application::InputEvent::Modifier::Shift) modifiers |= Sdl2Application::InputEvent::Modifier::Shift;
if(modifiers & Sdl2Application::InputEvent::Modifier::Ctrl) modifiers |= Sdl2Application::InputEvent::Modifier::Ctrl;
if(modifiers & Sdl2Application::InputEvent::Modifier::Alt) modifiers |= Sdl2Application::InputEvent::Modifier::Alt;
return modifiers;
}
}
#ifdef CORRADE_TARGET_EMSCRIPTEN
Sdl2Application* Sdl2Application::instance = nullptr;
void Sdl2Application::staticMainLoop() {
instance->mainLoop();
}
#endif
/** @todo Delegating constructor when support for GCC 4.6 is dropped */
Sdl2Application::Sdl2Application(const Arguments&, const Configuration& configuration): context(nullptr), flags(Flag::Redraw) {
initialize();
createContext(configuration);
}
#ifndef DOXYGEN_GENERATING_OUTPUT
Sdl2Application::Sdl2Application(const Arguments&): context(nullptr), flags(Flag::Redraw) {
initialize();
createContext();
}
#endif
Sdl2Application::Sdl2Application(const Arguments&, std::nullptr_t): context(nullptr), flags(Flag::Redraw) {
initialize();
}
void Sdl2Application::initialize() {
#ifdef CORRADE_TARGET_EMSCRIPTEN
CORRADE_ASSERT(!instance, "Platform::Sdl2Application::Sdl2Application(): the instance is already created", );
instance = this;
#endif
if(SDL_Init(SDL_INIT_VIDEO) < 0) {
Error() << "Cannot initialize SDL.";
std::exit(1);
}
}
void Sdl2Application::createContext() { createContext({}); }
void Sdl2Application::createContext(const Configuration& configuration) {
if(!tryCreateContext(configuration)) std::exit(1);
}
bool Sdl2Application::tryCreateContext(const Configuration& configuration) {
CORRADE_ASSERT(!context, "Platform::Sdl2Application::tryCreateContext(): context already created", false);
/* Enable double buffering and 24bt depth buffer */
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
/* Multisampling */
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, configuration.sampleCount() > 1 ? 1 : 0);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, configuration.sampleCount());
/* Flags: if not hidden, set as shown */
Uint32 windowFlags(configuration.windowFlags());
if(!(configuration.windowFlags() & Configuration::WindowFlag::Hidden)) windowFlags |= SDL_WINDOW_SHOWN;
/** @todo Remove when Emscripten has proper SDL2 support */
#ifndef CORRADE_TARGET_EMSCRIPTEN
/* Set context version, if requested */
if(configuration.version() != Version::None) {
Int major, minor;
std::tie(major, minor) = version(configuration.version());
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, major);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, minor);
#ifndef MAGNUM_TARGET_GLES
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, configuration.version() >= Version::GL310 ?
SDL_GL_CONTEXT_PROFILE_CORE : SDL_GL_CONTEXT_PROFILE_COMPATIBILITY);
#else
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
#endif
}
#ifdef MAGNUM_TARGET_GLES
else {
#ifdef MAGNUM_TARGET_GLES3
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
#elif defined(MAGNUM_TARGET_GLES2)
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
#else
#error Unsupported OpenGL ES version
#endif
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
}
/* On OS X we need to create 3.2 context, as the default (2.1) contains
compatibility features which are not implemented for newer GL versions
in Apple's GL drivers, thus we would be forever stuck on 2.1 without the
new features. In practice SDL fails to create 2.1 context on recent OS X
versions. */
#elif defined(__APPLE__)
else {
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
}
#endif
if(!(window = SDL_CreateWindow(configuration.title().data(),
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
configuration.size().x(), configuration.size().y(),
SDL_WINDOW_OPENGL|windowFlags)))
{
Error() << "Platform::Sdl2Application::tryCreateContext(): cannot create window:" << SDL_GetError();
return false;
}
/* Fall back to GL 2.1, if 3.2 context creation fails on OS X */
#ifdef __APPLE__
if(!(context = SDL_GL_CreateContext(window))){
Warning() << "Platform::Sdl2Application::tryCreateContext(): cannot create core context:" << SDL_GetError() << "(falling back to compatibility context)";
SDL_DestroyWindow(window);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_COMPATIBILITY);
if(!(window = SDL_CreateWindow(configuration.title().data(),
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
configuration.size().x(), configuration.size().y(),
SDL_WINDOW_OPENGL|flags)))
{
Error() << "Platform::Sdl2Application::tryCreateContext(): cannot create window:" << SDL_GetError();
return false;
}
if(!(context = SDL_GL_CreateContext(window))){
Error() << "Platform::Sdl2Application::tryCreateContext(): cannot create compatibility context:" << SDL_GetError();
SDL_DestroyWindow(window);
window = nullptr;
return false;
}
}
#else
if(!(context = SDL_GL_CreateContext(window))) {
Error() << "Platform::Sdl2Application::tryCreateContext(): cannot create context:" << SDL_GetError();
SDL_DestroyWindow(window);
window = nullptr;
return false;
}
#endif
#else
context = SDL_SetVideoMode(configuration.size().x(), configuration.size().y(), 24, SDL_OPENGL|SDL_HWSURFACE|SDL_DOUBLEBUF);
#endif
c = new Context;
return true;
}
void Sdl2Application::swapBuffers() {
#ifndef CORRADE_TARGET_EMSCRIPTEN
SDL_GL_SwapWindow(window);
#else
SDL_Flip(context);
#endif
}
Sdl2Application::~Sdl2Application() {
delete c;
#ifndef CORRADE_TARGET_EMSCRIPTEN
SDL_GL_DeleteContext(context);
SDL_DestroyWindow(window);
#else
SDL_FreeSurface(context);
CORRADE_INTERNAL_ASSERT(instance == this);
instance = nullptr;
#endif
SDL_Quit();
}
int Sdl2Application::exec() {
#ifndef CORRADE_TARGET_EMSCRIPTEN
while(!(flags & Flag::Exit)) mainLoop();
#else
emscripten_set_main_loop(staticMainLoop, 0, true);
#endif
return 0;
}
void Sdl2Application::exit() {
#ifndef CORRADE_TARGET_EMSCRIPTEN
flags |= Flag::Exit;
#else
emscripten_cancel_main_loop();
#endif
}
void Sdl2Application::mainLoop() {
SDL_Event event;
while(SDL_PollEvent(&event)) {
switch(event.type) {
case SDL_WINDOWEVENT:
switch(event.window.event) {
case SDL_WINDOWEVENT_RESIZED:
viewportEvent({event.window.data1, event.window.data2});
flags |= Flag::Redraw;
break;
case SDL_WINDOWEVENT_EXPOSED:
flags |= Flag::Redraw;
break;
} break;
case SDL_KEYDOWN:
case SDL_KEYUP: {
KeyEvent e(static_cast<KeyEvent::Key>(event.key.keysym.sym), fixedModifiers(event.key.keysym.mod));
event.type == SDL_KEYDOWN ? keyPressEvent(e) : keyReleaseEvent(e);
} break;
case SDL_MOUSEBUTTONDOWN:
case SDL_MOUSEBUTTONUP: {
MouseEvent e(static_cast<MouseEvent::Button>(event.button.button), {event.button.x, event.button.y});
event.type == SDL_MOUSEBUTTONDOWN ? mousePressEvent(e) : mouseReleaseEvent(e);
} break;
case SDL_MOUSEWHEEL:
if(event.wheel.y != 0) {
MouseEvent e(event.wheel.y < 0 ? MouseEvent::Button::WheelUp : MouseEvent::Button::WheelDown, {event.wheel.x, event.wheel.y});
mousePressEvent(e);
} break;
case SDL_MOUSEMOTION: {
MouseMoveEvent e({event.motion.x, event.motion.y}, {event.motion.xrel, event.motion.yrel}, static_cast<MouseMoveEvent::Button>(event.motion.state));
mouseMoveEvent(e);
break;
}
case SDL_QUIT:
#ifndef CORRADE_TARGET_EMSCRIPTEN
flags |= Flag::Exit;
#else
emscripten_cancel_main_loop();
#endif
return;
}
}
if(flags & Flag::Redraw) {
flags &= ~Flag::Redraw;
drawEvent();
return;
}
#ifndef CORRADE_TARGET_EMSCRIPTEN
SDL_WaitEvent(nullptr);
#endif
}
void Sdl2Application::setMouseLocked(bool enabled) {
/** @todo Implement this in Emscripten */
#ifndef CORRADE_TARGET_EMSCRIPTEN
SDL_SetWindowGrab(window, enabled ? SDL_TRUE : SDL_FALSE);
SDL_SetRelativeMouseMode(enabled ? SDL_TRUE : SDL_FALSE);
#else
CORRADE_ASSERT(false, "Sdl2Application::setMouseLocked(): not implemented", );
static_cast<void>(enabled);
#endif
}
void Sdl2Application::viewportEvent(const Vector2i&) {}
void Sdl2Application::keyPressEvent(KeyEvent&) {}
void Sdl2Application::keyReleaseEvent(KeyEvent&) {}
void Sdl2Application::mousePressEvent(MouseEvent&) {}
void Sdl2Application::mouseReleaseEvent(MouseEvent&) {}
void Sdl2Application::mouseMoveEvent(MouseMoveEvent&) {}
Sdl2Application::Configuration::Configuration():
#ifndef CORRADE_TARGET_EMSCRIPTEN
_title("Magnum SDL2 Application"),
#endif
_size(800, 600), _windowFlags(WindowFlag::Resizable), _sampleCount(0)
#ifndef CORRADE_TARGET_EMSCRIPTEN
, _version(Version::None)
#endif
{}
Sdl2Application::Configuration::~Configuration() = default;
Sdl2Application::InputEvent::Modifiers Sdl2Application::MouseEvent::modifiers() {
if(modifiersLoaded) return _modifiers;
modifiersLoaded = true;
return _modifiers = fixedModifiers(Uint16(SDL_GetModState()));
}
Sdl2Application::InputEvent::Modifiers Sdl2Application::MouseMoveEvent::modifiers() {
if(modifiersLoaded) return _modifiers;
modifiersLoaded = true;
return _modifiers = fixedModifiers(Uint16(SDL_GetModState()));
}
template class BasicScreen<Sdl2Application>;
template class BasicScreenedApplication<Sdl2Application>;
}}