c++ - SDL 2.0.3 与 Ogre 1.9.0 和 IOS

Question

我正在尝试将 SDL 2.0.3 集成到 Ogre 1.9.0 中以进行窗口和事件处理，它在 Linux 下运行良好，但我在 IOS 7.1 下遇到问题。

我无法从 SDL 获取任何输入或窗口事件。我正在使用 wmInfo.info.uikit.window 获取句柄，然后将其传递给 Ogre。我唯一不确定的是我是否正确获取了 GL 上下文。当我用 Ogre SDL_APP_DIDENTERFOREGROUND 启动 SDL 时，我只能得到一个事件。我需要为 IOS 做些什么吗？

我非常感谢任何帮助，因为我遇到了上述问题。

我也在 OSX 和 IOS 7.1 模拟器下工作。以下是我对原始 Ogre iOS 模板所做的更改。

SDL 和 Ogre 初始化:

//SDL
if (SDL_Init(SDL_INIT_VIDEO) < 0)
{
    printf("Could not initialize SDL\n");
    return 1;
}
SDL_GL_SetAttribute(SDL_GL_CONTEXT_EGL, 1);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);

SDL_DisplayMode displayMode;
SDL_GetDesktopDisplayMode(0, &displayMode);

/* create window and renderer */
SDL_Window* window = SDL_CreateWindow(NULL, 0, 0, displayMode.w, displayMode.h,    SDL_WINDOW_OPENGL | SDL_WINDOW_FULLSCREEN | SDL_WINDOW_RESIZABLE);

SDL_GLContext glContext = SDL_GL_CreateContext(window);

SDL_SysWMinfo wmInfo;
SDL_VERSION(&wmInfo.version);
SDL_GetWindowWMInfo(window,&wmInfo);

m_pLog = Ogre::LogManager::getSingleton().createLog("OgreLogfile.log", true, true, false);
m_pLog->setDebugOutputEnabled(true);

String pluginsPath;
m_pRoot = new Ogre::Root(pluginsPath, Ogre::macBundlePath() + "/ogre.cfg");
m_StaticPluginLoader.load();

m_pRenderWnd = m_pRoot->initialise(false, wndTitle);

size_t winHandle = reinterpret_cast<size_t>(wmInfo.info.uikit.window);
size_t glHandle = reinterpret_cast<size_t>(glContext);

Ogre::NameValuePairList params;
params["externalWindowHandle"] = Ogre::StringConverter::toString((unsigned long)winHandle);
params["externalGLContext"] =   Ogre::StringConverter::toString((unsigned long)glHandle);
params["externalGLControl"] = String("True");

m_pRenderWnd = m_pRoot->createRenderWindow("", displayMode.w/2, displayMode.h/2, false,  &params);

我的主循环:

DemoApp demo;
demo.startDemo();

bool done = false;

SDL_Event event;

double mStartTime;
double mLastFrameTime;

while (!done)
{

  mStartTime = OgreFramework::getSingletonPtr()->m_pTimer->getMillisecondsCPU();
  OgreFramework::getSingletonPtr()->updateOgre(mLastFrameTime);
  OgreFramework::getSingletonPtr()->m_pRoot->renderOneFrame();
  mLastFrameTime = OgreFramework::getSingletonPtr()->m_pTimer->getMillisecondsCPU() - mStartTime;


    while (SDL_PollEvent(&event))
    {
        switch (event.type)
        {
            case SDL_FINGERMOTION:
                SDL_Log("Finger Motion");
                break;

            case SDL_FINGERDOWN:
                SDL_Log("Finger Down");
                break;

            case SDL_FINGERUP:
                SDL_Log("Finger Up");
                break;

            case SDL_QUIT:
                done = true;
                break;

            case SDL_APP_DIDENTERFOREGROUND:
                SDL_Log("SDL_APP_DIDENTERFOREGROUND");
                break;

            case SDL_APP_DIDENTERBACKGROUND:
                SDL_Log("SDL_APP_DIDENTERBACKGROUND");
                break;

            case SDL_APP_LOWMEMORY:
                SDL_Log("SDL_APP_LOWMEMORY");
                break;

            case SDL_APP_TERMINATING:
                SDL_Log("SDL_APP_TERMINATING");
                break;

            case SDL_APP_WILLENTERBACKGROUND:
                SDL_Log("SDL_APP_WILLENTERBACKGROUND");
                break;

            case SDL_APP_WILLENTERFOREGROUND:
                SDL_Log("SDL_APP_WILLENTERFOREGROUND");
                break;

            case SDL_WINDOWEVENT:
            {
                switch (event.window.event)
                {

                    case SDL_WINDOWEVENT_RESIZED:
                    {
                        SDL_Log("Window %d resized to %dx%d", event.window.windowID, event.window.data1, event.window.data2);

                        break;
                    }
                }
            }
        }
    }

Answer 1

我意识到这个问题已经有几年了，但我遇到了同样的问题，我希望我的解决方案对其他人有用。

问题是您正在用 Ogre 的 UIView (OgreEAGL2View) 替换 SDL 的 UIView (SDL_uikitview)，因此您将不再接收任何触摸输入或通过 SDL_uikitviewcontroller 或 SDL_uikitview 实现的任何功能。这种替换发生在 GLES2 RenderSystem 内部(特别是在 OgreEAGL2Window.mm 中)

我自己解决这个问题的方法是创建我自己的 UIViewController 和 UIView，然后将该 View 置于 SDL 的 View 之后。然后您可以从 SDL 的 View 接收触摸输入，同时渲染到 Ogre 的 View 中。这将需要创建一个 Objective-C 编译单元，代码看起来像这样:

#include "OgreEAGL2View.h"
#import <UIKit/UIWindow.h>
#import <UIKit/UIDevice.h>
// other includes

// call this from your C++ framework
// pass it your startup params
void setupMyiOSViews(Ogre::NameValuePairList &params)
{
    // grab the UIWindow (you must have called SDL_createwindow before calling this)
    SDL_SysWMinfo wmInfo;
    SDL_Window *sdlWindow;
    SDL_VERSION(&wmInfo.version);
    SDL_GetWindowWMInfo(sdlWindow, &wmInfo);
    UIWindow *w = wmInfo.info.uikit.window;

    // get a rectangle with the screen dimensions
    CGRect rect = [[UIScreen mainScreen] applicationFrame];
    // instantiate a view controller of Ogre's subclass of UIViewController
    EAGL2ViewController *myViewController = [[EAGL2ViewController alloc] init];
    // instantiate a view of Ogre's subclass of UIView
    EAGL2View *myView = [[EAGL2View alloc] initWithFrame:rect];
    // make sure it's not transparent
    myView.opaque = YES;
    // attach the view to the viewcontroller
    myViewController.view = myView;
    // add the view to the current window
    [w addSubview:myView];
    // put the view *behind* the SDL view
    [w sendSubviewToBack:myView];

    // add the window, viewcontroller, and view to the proper parameters
    // UIWindow maps to param: externalWindowHandle
    // UIViewController maps to param: externalViewControllerHandle
    // UIView maps to param: externalViewHandle
    Ogre::String str_w = Ogre::StringConverter::toString((unsigned long)w);
    Ogre::String str_vc = Ogre::StringConverter::toString((unsigned long)myViewController);
    Ogre::String str_v = Ogre::StringConverter::toString((unsigned long)myView);

    params["externalWindowHandle"] = str_w;
    params["externalViewControllerHandle"] = str_vc;
    params["externalViewHandle"] = str_v;

    Ogre::LogManager::getSingleton().logMessage("externalWindowHandle: " + str_w);
    Ogre::LogManager::getSingleton().logMessage("externalViewControllerHandle: " + str_vc);
    Ogre::LogManager::getSingleton().logMessage("externalViewHandle: " + str_v);

// now pass params into Ogre::Root::createRenderWindow
}

请注意，甚至不需要使用 SDL 创建上下文。 Ogre 现在将渲染到它自己的 View 和 View Controller 中