Hi, I try to make some experiments with OpenGL ES 2.0 on both windows and linux, and while I myself is searching for answers ( I think will resolve in coming days ), I will share few observations for anyone concerned.
I have following problem with latest development code. On windows using http://code.google.com/p/angleproject/ and https://github.com/fantasydr/sdl-gles and SDL viewer example I attempted to have OpenGL ES 2.0 with visual studio compiler ( I used recommended settings ) Cmake settings for OpenGL ES 2.0 OSG_GL1_AVAILABLE OFF OSG_GL2_AVAILABLE OFF OSG_GL3_AVAILABLE OFF OSG_GLES1_AVAILABLE OFF OSG_GLES2_AVAILABLE ON OPENGL_INCLUDE_DIR /pathtogles/include/ OPENGL_LIBRARY /pathtogles/lib/libGLESv2.so OPENGL_egl_LIBRARY /pathtoegllib/libEGL.so OSG_GL_DISPLAYLISTS_AVAILABLE OFF SG_GL_MATRICES_AVAILABLE OFF OSG_GL_VERTEX_FUNCS_AVAILABLE OFF OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE OFF OSG_GL_FIXED_FUNCTION_AVAILABLE OFF OSG_CPP_EXCEPTIONS_AVAILABLE OFF While mostly it works - it compiles and runs, it fails to compile build-in osg shaders ( though I checked to have D3Dcompiler_46.dll in bin folder otherwise http://code.google.com/p/angleproject/ will not work outside visual studio ), You might find my OpenGL ES/SDL cpp file in attachment. to check further problem I also compiled osg on linux with mesa es 2.0 support (on latest ubuntu ) with exact paths for opengl OPENGL_egl_LIBRARY /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1 OPENGL_gl_LIBRARY /usr/lib/x86_64-linux-gnu/mesa-egl/libGLESv2.so somehow I also get problems in release build I get from osgviewer with cow.osg the output reads GraphicsWindowX11::init() - eglInitialize() succeded eglMajorVersion=1 iMinorVersion=4 GraphicsWindowX11::init() - window created =1 Warning: TexGen::apply(State&) - not supported. Warning: Material::apply(State&) - not supported. Warning: TexGen::apply(State&) - not supported. and no cow is visible So does it mean that current opengl es implementation unusable? (I will bebug on linux tomorrow, because so far adding IF( NOT CMAKE_BUILD_TYPE ) SET( CMAKE_BUILD_TYPE Debug ) SET( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DDEBUG" ) ENDIF( NOT CMAKE_BUILD_TYPE ) to CMakeLists.txt causes problem with linker ( not sure it problem with CMakeLists.txt or with my actions - I'm not very quick when on linux ). Regards Sergey
/* OpenSceneGraph example, osgviewerSDL. * * 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 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. */ // (C) 2005 Mike Weiblen http://mew.cx/ released under the OSGPL. // Simple example using GLUT to create an OpenGL window and OSG for rendering. // Derived from osgGLUTsimple.cpp and osgkeyboardmouse.cpp #include <osgViewer/Viewer> #include <osgViewer/ViewerEventHandlers> #include <osgGA/TrackballManipulator> #include <osgDB/ReadFile> #include <osg/PositionAttitudeTransform> #include "SDL.h" #include <iostream> #include <osgText/Text> #include <osg/Geometry> osg::Node* createScene() { // create drawable geometry object osg::Geometry* pGeo = new osg::Geometry; // add 3 vertices creating a triangle osg::Vec3Array* pVerts = new osg::Vec3Array; pVerts->push_back( osg::Vec3( -1, 0, -1 ) ); pVerts->push_back( osg::Vec3( 1, 0, -1 ) ); pVerts->push_back( osg::Vec3( 0, 0, 1 ) ); pGeo->setVertexArray( pVerts ); // create a primitive set (add index numbers) osg::DrawElementsUInt* pPrimitiveSet = new osg::DrawElementsUInt( osg::PrimitiveSet::TRIANGLES, 0 ); pPrimitiveSet->push_back( 2 ); pPrimitiveSet->push_back( 1 ); pPrimitiveSet->push_back( 0 ); pGeo->addPrimitiveSet( pPrimitiveSet ); // create color array data (each corner of our triangle will have one color component) osg::Vec4Array* pColors = new osg::Vec4Array; pColors->push_back( osg::Vec4( 1.0f, 0.0f, 0.0f, 1.0f ) ); pColors->push_back( osg::Vec4( 0.0f, 1.0f, 0.0f, 1.0f ) ); pColors->push_back( osg::Vec4( 0.0f, 0.0f, 1.0f, 1.0f ) ); pGeo->setColorArray( pColors ); // make sure that our geometry is using one color per vertex pGeo->setColorBinding( osg::Geometry::BIND_PER_VERTEX ); // create geometry node that will contain all our drawables osg::Geode* pGeode = new osg::Geode; osg::StateSet* pStateSet = pGeode->getOrCreateStateSet(); pStateSet->setMode( GL_LIGHTING, osg::StateAttribute::OFF ); pGeode->addDrawable( pGeo ); return pGeode; } bool convertEvent(SDL_Event& event, osgGA::EventQueue& eventQueue) { switch (event.type) { case SDL_MOUSEMOTION: eventQueue.mouseMotion(event.motion.x, event.motion.y); return true; case SDL_MOUSEBUTTONDOWN: eventQueue.mouseButtonPress(event.button.x, event.button.y, event.button.button); return true; case SDL_MOUSEBUTTONUP: eventQueue.mouseButtonRelease(event.button.x, event.button.y, event.button.button); return true; case SDL_KEYUP: eventQueue.keyRelease( (osgGA::GUIEventAdapter::KeySymbol) event.key.keysym.unicode); return true; case SDL_KEYDOWN: eventQueue.keyPress( (osgGA::GUIEventAdapter::KeySymbol) event.key.keysym.unicode); return true; //case SDL_VIDEORESIZE: // eventQueue.windowResize(0, 0, event.resize.w, event.resize.h ); return true; default: break; } return false; } int main( int argc, char **argv ) { if (argc<2) { std::cout << argv[0] <<": requires filename argument." << std::endl; return 1; } // init SDL if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError()); exit(1); } atexit(SDL_Quit); 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 ); SDL_GL_SetAttribute(SDL_GL_CONTEXT_EGL, 1); SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2); SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0); SDL_GL_SetAttribute(SDL_GL_CONTEXT_EGL, 1); SDL_Window* window = SDL_CreateWindow("ContextWindow", 0, 0, 800, 600, SDL_WINDOW_OPENGL );//| SDL_WINDOW_FULLSCREEN // Create an OpenGL context associated with the window. SDL_GLContext glcontext = SDL_GL_CreateContext(window); // load the scene. osg::ref_ptr<osg::Node> loadedModel = createScene();//osgDB::readNodeFile(argv[1]); if (!loadedModel) { std::cout << argv[0] <<": No data loaded." << std::endl; return 1; } // Starting with SDL 1.2.10, passing in 0 will use the system's current resolution. unsigned int windowWidth = 0; unsigned int windowHeight = 0; // Passing in 0 for bitdepth also uses the system's current bitdepth. This works before 1.2.10 too. unsigned int bitDepth = 0; // If not linked to SDL 1.2.10+, then we must use hardcoded values /*const SDL_version* linked_version = SDL_Linked_Version(); if(linked_version->major == 1 && linked_version->minor == 2) { if(linked_version->patch < 10) { windowWidth = 1280; windowHeight = 1024; } }*/ // set up the surface to render to SDL_Surface* screen = SDL_GetWindowSurface(window); if ( screen == NULL ) { std::cerr<<"Unable to set "<<windowWidth<<"x"<<windowHeight<<" video: %s\n"<< SDL_GetError()<<std::endl; exit(1); } //SDL_EnableUNICODE(1); // If we used 0 to set the fields, query the values so we can pass it to osgViewer windowWidth = screen->w; windowHeight = screen->h; osgViewer::Viewer viewer; osg::ref_ptr<osgViewer::GraphicsWindowEmbedded> gw = viewer.setUpViewerAsEmbeddedInWindow(0,0,windowWidth,windowHeight); viewer.setSceneData(loadedModel.get()); viewer.setCameraManipulator(new osgGA::TrackballManipulator); viewer.addEventHandler(new osgViewer::StatsHandler); viewer.realize(); bool done = false; while( !done ) { SDL_Event event; while ( SDL_PollEvent(&event) ) { // pass the SDL event into the viewers event queue convertEvent(event, *(gw->getEventQueue())); switch (event.type) { /* case SDL_VIDEORESIZE: SDL_SetVideoMode(event.resize.w, event.resize.h, bitDepth, SDL_OPENGL | SDL_RESIZABLE); gw->resized(0, 0, event.resize.w, event.resize.h ); break;*/ case SDL_KEYUP: if (event.key.keysym.sym==SDLK_ESCAPE) done = true; /*if (event.key.keysym.sym=='f') { SDL_WM_ToggleFullScreen(screen); gw->resized(0, 0, screen->w, screen->h ); }*/ break; case SDL_QUIT: done = true; } } if (done) continue; // draw the new frame viewer.frame(); // Swap Buffers SDL_GL_SwapWindow(window); //SDL_GL_SwapBuffers(); } return 0; } /*EOF*/
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