Ogre 1.10.x Test for Emscripten

Makefile

emsc:
	em++ ogre_test.cpp -I/usr/ogre/OgreMain/include/ -I/usr/ogre/build/include/ -I/usr/ogre/RenderSystems/GLES2/include/ -I/usr/ogre/PlugIns/OctreeSceneManager/include/ -I/usr/ogre/Components/RTShaderSystem/include/ -o ogre_test.bc -Werror
	em++ ogre_test.bc /usr/ogre/build_static/lib/libRenderSystem_GLES2Static.a /usr/ogre/build_static/lib/libPlugin_OctreeSceneManagerStatic.a /usr/ogre/build_static/lib/libOgreRTShaderSystemStatic.a /usr/ogre/build_static/lib/libOgreMainStatic.a -o ogre.html --preload-file assets/plugins.cfg --preload-file assets/media/models/ogrehead.mesh --preload-file assets/media/materials/scripts/Ogre.material --preload-file assets/media/materials/scripts/cool.frag --preload-file assets/media/materials/scripts/cool.vs

native:
	g++ -L/usr/lib/x86_64-linux-gnu/ -lfreeimage -lpthread -lX11 -lXt -lXmu -lXaw -lm -lGL -lGLU -lXrandr ogre_test.cpp -I/usr/ogre/OgreMain/include/ -I/usr/ogre/build/include/ -I/usr/ogre/RenderSystems/GL/include/ -I/usr/ogre/PlugIns/OctreeSceneManager/include/ -I/usr/ogre/Components/RTShaderSystem/include/ /usr/ogre/build_native/lib/libRenderSystem_GLStatic.a /usr/ogre/build_native/lib/libPlugin_OctreeSceneManagerStatic.a /usr/ogre/build_native/lib/libOgreRTShaderSystemStatic.a /usr/ogre/build_native/lib/libOgreMainStatic.a -o ogre.a -fpermissive

all: emsc

ogre_test.cpp

#include <Ogre.h>

#ifdef EMSCRIPTEN
    #include <OgreGLES2Plugin.h>
    #include <EGL/egl.h>    
#else
    #include <OgreGLPlugin.h>
#endif
#include <OgreOctreePlugin.h>
#include <OgreRTShaderSystem.h>

#include <stdio.h>

using namespace Ogre;

Root* root = 0;
RenderWindow *window = 0;

void render_loop_cb()
{
        window->update(false);
        window->swapBuffers();
        root->renderOneFrame();
        Ogre::WindowEventUtilities::messagePump();
}

int main()
{
    // create a ogre root, 
    root = new Root( "assets/plugins.cfg", "assets/ogre.cfg", "ogre.log" );

    // load and install plugins here manually, since we are using a static build of ogre
    // we need to be using GLES2 under emscripten
#ifdef EMSCRIPTEN
    Ogre::GLES2Plugin *mGLPlugin = new Ogre::GLES2Plugin();
#else
    Ogre::GLPlugin *mGLPlugin = new Ogre::GLPlugin();
#endif
    Ogre::OctreePlugin* mOCPlugin = new Ogre::OctreePlugin();

    mGLPlugin->install();
    mOCPlugin->install();

    // pick the first available render system
    RenderSystem *renderSystem;
    const RenderSystemList renderers = root->getAvailableRenderers();

    // early exit if we didn't get a render system
    if(renderers.empty())
    {
        printf("ERROR: No renderers are available.\n");
        return -1;
    }

    renderSystem = *(renderers.begin());
    Root::getSingleton().setRenderSystem(renderSystem);
    renderSystem->setConfigOption("Video Mode", "640 x 480");

    // the dependency tracking for emscripten seems to be missing
    // that we are using EGL unless we explicitly use egl-functions here
#ifdef EMSCRIPTEN
    printf( "fake-usage of egl: %X\n", (unsigned int) eglGetProcAddress("glClear") );
#endif

    // this method can only be called after a renderer has been selected with Root::setRenderSystem
    root->initialise(true, "Hello World!");

    // resource handling
    ResourceGroupManager::getSingleton().addResourceLocation( "assets/media/models", "FileSystem");
    ResourceGroupManager::getSingleton().addResourceLocation( "assets/media/materials/scripts", "FileSystem");
    ResourceGroupManager::getSingleton().initialiseAllResourceGroups();

    // scene management
    SceneManager *smgr = root->createSceneManager( ST_GENERIC, "DefaultSceneManager");
    smgr->setAmbientLight(Ogre::ColourValue(0.5f, 0.5f, 0.5f)); // set ambient light for the scene
 
    // Create an mesh entity and add it to the scene
    Ogre::Entity* ogreHead = smgr->createEntity("Head", "ogrehead.mesh");
    Ogre::SceneNode* headNode = smgr->getRootSceneNode()->createChildSceneNode("HeadNode");
    headNode->attachObject(ogreHead);
    headNode->translate( 0,0,-200.0f );
 
    // Create a Light attach it as a child to the mesh head
    Ogre::Light* light = smgr->createLight("MainLight");
    light->setType(Ogre::Light::LT_DIRECTIONAL);
    light->setDiffuseColour(ColourValue(0.5, 0.5, 0.5));
    light->setSpecularColour(ColourValue(0.5, 0.5, 0.5));
    light->setDirection(Ogre::Vector3(-1, 0.0, -1.0));
    headNode->attachObject( light );

    // setup a camera and viewport
    Camera *cam = smgr->createCamera("MainCamera");
    window = root->getAutoCreatedWindow();
    Viewport *vp = window->addViewport(cam);
    vp->setBackgroundColour(ColourValue(0.3, 0.6, 0.9));


    // enter the main render loop
    #ifdef EMSCRIPTEN 
        emscripten_set_main_loop( render_loop_cb, 0, 1 );
    #else
        while(1)
        {
            render_loop_cb();
        }
    #endif

    delete root;

    return 0;
}