Add osgemscripten example
This commit is contained in:
Michael Kapelko
parent
0b5f45289d
commit
f992ec1440
60
examples/osgemscripten/CMakeLists.txt
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60
examples/osgemscripten/CMakeLists.txt
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CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0 FATAL_ERROR)
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# Path to OpenSceneGraph
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SET(OSG_DIR "${CMAKE_SOURCE_DIR}/../..")
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# Specify critical OpenSceneGraph build variables.
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SET(BUILD_OSG_APPLICATIONS NO CACHE BOOL "Do not build applications")
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SET(EGL_LIBRARY "GL" CACHE STRING "Suppress linkage error")
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SET(OSG_GL1_AVAILABLE OFF CACHE BOOL "Unavailable under Emscripten")
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SET(OSG_GL2_AVAILABLE OFF CACHE BOOL "Unavailable under Emscripten")
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SET(OSG_GLES2_AVAILABLE ON CACHE BOOL "GLES2 is what Emscripten uses")
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SET(DYNAMIC_OPENTHREADS OFF CACHE BOOL "Link OpenThreads statically")
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SET(DYNAMIC_OPENSCENEGRAPH OFF CACHE BOOL "Link OpenSceneGraph statically")
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# Reference SDL2 during build process.
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# We use SDL2 to do the following:
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# * OpenGL functions' address retrieval
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# * OpenGL graphics context creation
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SET(USE_SDL2 "-s USE_SDL=2")
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SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${USE_SDL2}" CACHE STRING "Use SDL2" FORCE)
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# Reference OpenSceneGraph includes and libraries.
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SET(OSG_SOURCE_DIR "${OSG_DIR}")
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SET(OSG_BUILD_DIR "${OSG_DIR}/build/Emscripten")
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INCLUDE_DIRECTORIES(${OSG_SOURCE_DIR}/include)
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INCLUDE_DIRECTORIES(${OSG_BUILD_DIR}/include)
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LINK_DIRECTORIES(${OSG_BUILD_DIR}/lib)
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# Build OpenSceneGraph if osgViewer library is missing.
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IF(EXISTS "${OSG_BUILD_DIR}/lib/libosgViewer.a")
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MESSAGE("Skip building OpenSceneGraph")
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ELSE()
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MESSAGE("Build OpenSceneGraph")
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FILE(MAKE_DIRECTORY ${OSG_BUILD_DIR})
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ADD_SUBDIRECTORY(${OSG_SOURCE_DIR} ${OSG_BUILD_DIR})
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ENDIF()
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# Build example.
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ADD_EXECUTABLE(osgemscripten osgemscripten.cpp)
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# Make Emscripten generate ready-to-open HTML page.
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SET(CMAKE_EXECUTABLE_SUFFIX ".html")
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# Make Emscripten preload the resource.
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SET_TARGET_PROPERTIES(osgemscripten PROPERTIES LINK_FLAGS "--preload-file box.osgt")
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# Copy the resource to the build directory.
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CONFIGURE_FILE(box.osgt box.osgt COPYONLY)
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# Libraries must be linked in the specified order.
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# Otherwise you may get unsatisified linker errors.
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TARGET_LINK_LIBRARIES(
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osgemscripten
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osgViewer
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osgDB
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# osgDB plugins start.
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osgdb_osg
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osgdb_serializers_osg
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# osgDB plugins end.
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osgGA
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osgText
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osgUtil
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osg
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OpenThreads
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)
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43
examples/osgemscripten/README.md
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43
examples/osgemscripten/README.md
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How to build osgemscripten example
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==================================
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### 1. Install Emscripten
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Download and install [Emscripten portable SDK](http://kripken.github.io/emscripten-site/docs/getting_started/downloads.html)
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### 2. Create build directory
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Run the following commands:
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`mkdir /path/to/build/dir`
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`cd /path/to/build/dir`
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### 3. Configure example
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Run the following command:
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`cmake -DCMAKE_TOOLCHAIN_FILE=/path/to/emsdk-portable/emscripten/<version>/cmake/Modules/Platform/Emscripten.cmake /path/to/OpenSceneGraph/examples/osgemscripten`
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This also configures OpenSceneGraph as a dependency
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### 3. Build example
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Run the following command:
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`make`
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This also builds OpenSceneGraph under `/path/to/OpenSceneGraph/build/Emscripten`
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if it has not yet been built.
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### 4. Launch example
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Firefox only: locate and open `osgemscripten.html` file.
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All browsers:
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* go to the directory with `osgemscripten.html`
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* run `python -m SimpleHTTPServer 8080` from there
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* open `http://localhost:8080/osgemscripten.html` in any browser
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You should now see red cube in your web browser.
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857
examples/osgemscripten/box.osgt
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857
examples/osgemscripten/box.osgt
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#Ascii Scene
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#Version 92
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#Generator osgexport 0.13.0
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|
||||
0.16731 0.00000
|
||||
0.92198 0.00000
|
||||
0.99498 0.00000
|
||||
0.74911 0.00000
|
||||
1.00000 1.00000
|
||||
0.33368 0.50126
|
||||
}
|
||||
Indices FALSE
|
||||
Binding BIND_PER_VERTEX
|
||||
Normalize 0
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Matrix {
|
||||
1.00000 0.00000 0.00000 0.00000
|
||||
0.00000 1.00000 0.00000 0.00000
|
||||
0.00000 0.00000 1.00000 0.00000
|
||||
0.00000 0.00000 0.00000 1.00000
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
76
examples/osgemscripten/functions.h
Normal file
76
examples/osgemscripten/functions.h
Normal file
@ -0,0 +1,76 @@
|
||||
/* OpenSceneGraph example, osgemscripten.
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef OSGEMSCRIPTEN_FUNCTIONS_H
|
||||
#define OSGEMSCRIPTEN_FUNCTIONS_H
|
||||
|
||||
#include <osg/Notify>
|
||||
|
||||
// Convert NotifySeverity enum value to string.
|
||||
std::string logLevelToString(osg::NotifySeverity severity)
|
||||
{
|
||||
switch (severity)
|
||||
{
|
||||
case osg::DEBUG_FP:
|
||||
// Verbose.
|
||||
return "V";
|
||||
case osg::DEBUG_INFO:
|
||||
// Debug.
|
||||
return "D";
|
||||
case osg::NOTICE:
|
||||
case osg::INFO:
|
||||
// Info.
|
||||
return "I";
|
||||
case osg::WARN:
|
||||
// Warning.
|
||||
return "W";
|
||||
case osg::FATAL:
|
||||
case osg::ALWAYS:
|
||||
// Error.
|
||||
return "E";
|
||||
}
|
||||
}
|
||||
|
||||
#include <osg/Program>
|
||||
|
||||
// Fragment shader to display everything in red colour.
|
||||
static const char shaderFragment[] =
|
||||
"void main() { \n"
|
||||
" gl_FragColor = vec4(0.5, 0.3, 0.3, 1.0);\n"
|
||||
"} \n";
|
||||
// Geometry shader to pass geometry vertices to fragment shader.
|
||||
static const char shaderVertex[] =
|
||||
"void main() { \n"
|
||||
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; \n"
|
||||
"} \n";
|
||||
|
||||
osg::Program *createShaderProgram(
|
||||
const std::string &vertexShader,
|
||||
const std::string &fragmentShader)
|
||||
{
|
||||
// Load shaders.
|
||||
osg::Shader *vs = new osg::Shader(osg::Shader::VERTEX, vertexShader);
|
||||
osg::Shader *fs = new osg::Shader(osg::Shader::FRAGMENT, fragmentShader);
|
||||
// Compile shaders and compose shader program.
|
||||
osg::Program *prog = new osg::Program;
|
||||
prog->addShader(vs);
|
||||
prog->addShader(fs);
|
||||
return prog;
|
||||
}
|
||||
|
||||
#endif // OSGEMSCRIPTEN_FUNCTIONS_H
|
||||
84
examples/osgemscripten/osgemscripten.cpp
Normal file
84
examples/osgemscripten/osgemscripten.cpp
Normal file
@ -0,0 +1,84 @@
|
||||
/* OpenSceneGraph example, emscripten.
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#include <emscripten.h>
|
||||
#include <SDL2/SDL.h>
|
||||
|
||||
#include "osgemscripten.h"
|
||||
|
||||
// We use app global variable in loop() function.
|
||||
Application *app = 0;
|
||||
|
||||
// Stand alone function that is called by Emscripten to run the app.
|
||||
void loop()
|
||||
{
|
||||
SDL_Event e;
|
||||
while (SDL_PollEvent(&e))
|
||||
{
|
||||
if (app)
|
||||
{
|
||||
app->handleEvent(e);
|
||||
}
|
||||
}
|
||||
if (app)
|
||||
{
|
||||
app->frame();
|
||||
}
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
// Make sure SDL is working.
|
||||
if (SDL_Init(SDL_INIT_VIDEO) < 0)
|
||||
{
|
||||
printf("OSGWeb. Could not init SDL: '%s'\n", SDL_GetError());
|
||||
return 1;
|
||||
}
|
||||
// Clean SDL up at exit.
|
||||
atexit(SDL_Quit);
|
||||
// Configure rendering context.
|
||||
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);
|
||||
// Create rendering window.
|
||||
int width = 800;
|
||||
int height = 600;
|
||||
SDL_Window* window =
|
||||
SDL_CreateWindow(
|
||||
"OSGWeb",
|
||||
SDL_WINDOWPOS_CENTERED,
|
||||
SDL_WINDOWPOS_CENTERED,
|
||||
width,
|
||||
height,
|
||||
SDL_WINDOW_OPENGL);
|
||||
if (!window)
|
||||
{
|
||||
printf("OSGWeb. Could not create window: '%s'\n", SDL_GetError());
|
||||
return 1;
|
||||
}
|
||||
SDL_GL_CreateContext(window);
|
||||
// Create application.
|
||||
app = new Application;
|
||||
app->setupWindow(width, height);
|
||||
app->loadScene("box.osgt");
|
||||
// Render asynchronously.
|
||||
emscripten_set_main_loop(loop, -1, 0);
|
||||
return 0;
|
||||
}
|
||||
180
examples/osgemscripten/osgemscripten.h
Normal file
180
examples/osgemscripten/osgemscripten.h
Normal file
@ -0,0 +1,180 @@
|
||||
/* OpenSceneGraph example, osgemscripten.
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef OSGEMSCRIPTEN_OSGEMSCRIPTEN_H
|
||||
#define OSGEMSCRIPTEN_OSGEMSCRIPTEN_H
|
||||
|
||||
#include "functions.h"
|
||||
|
||||
#include <osgDB/ReadFile>
|
||||
#include <osgViewer/Viewer>
|
||||
|
||||
#include <osgGA/TrackballManipulator>
|
||||
|
||||
// VBO setup visitor.
|
||||
#include <osg/Geode>
|
||||
#include <osg/Geometry>
|
||||
#include <osg/NodeVisitor>
|
||||
|
||||
// Initialize OSG plugins statically.
|
||||
USE_OSGPLUGIN(osg2)
|
||||
USE_SERIALIZER_WRAPPER_LIBRARY(osg)
|
||||
|
||||
// This class prints OpenSceneGraph notifications to console.
|
||||
class Logger : public osg::NotifyHandler
|
||||
{
|
||||
public:
|
||||
Logger() { }
|
||||
virtual ~Logger() { }
|
||||
|
||||
// Override NotifyHandler::notify() to receive OpenSceneGraph notifications.
|
||||
void notify(osg::NotifySeverity severity, const char *message)
|
||||
{
|
||||
printf("OSG/%s %s", logLevelToString(severity).c_str(), message);
|
||||
}
|
||||
};
|
||||
|
||||
// This class forces the use of VBO.
|
||||
class VBOSetupVisitor : public osg::NodeVisitor
|
||||
{
|
||||
public:
|
||||
VBOSetupVisitor() :
|
||||
osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) { }
|
||||
virtual void apply(osg::Geode &geode)
|
||||
{
|
||||
for (unsigned int i = 0; i < geode.getNumDrawables(); ++i)
|
||||
{
|
||||
osg::Geometry *geom =
|
||||
dynamic_cast<osg::Geometry*>(geode.getDrawable(i));
|
||||
if (geom)
|
||||
{
|
||||
geom->setUseVertexBufferObjects(true);
|
||||
}
|
||||
}
|
||||
NodeVisitor::apply(geode);
|
||||
}
|
||||
};
|
||||
|
||||
class Application
|
||||
{
|
||||
public:
|
||||
Application()
|
||||
{
|
||||
setupLogging();
|
||||
setupRendering();
|
||||
}
|
||||
~Application()
|
||||
{
|
||||
tearDownLogging();
|
||||
tearDownRendering();
|
||||
}
|
||||
|
||||
bool handleEvent(SDL_Event &e)
|
||||
{
|
||||
osgViewer::GraphicsWindow *gw =
|
||||
dynamic_cast<osgViewer::GraphicsWindow *>(
|
||||
mViewer->getCamera()->getGraphicsContext());
|
||||
if (!gw)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
osgGA::EventQueue &queue = *(gw->getEventQueue());
|
||||
switch (e.type)
|
||||
{
|
||||
case SDL_MOUSEMOTION:
|
||||
queue.mouseMotion(e.motion.x, e.motion.y);
|
||||
return true;
|
||||
case SDL_MOUSEBUTTONDOWN:
|
||||
queue.mouseButtonPress(e.button.x, e.button.y, e.button.button);
|
||||
printf("OSGWeb. Application. Mouse button down\n");
|
||||
return true;
|
||||
case SDL_MOUSEBUTTONUP:
|
||||
queue.mouseButtonRelease(e.button.x, e.button.y, e.button.button);
|
||||
printf("OSGWeb. Application. Mouse button up\n");
|
||||
return true;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
void loadScene(const std::string &fileName)
|
||||
{
|
||||
// Load scene.
|
||||
osg::Node *scene = osgDB::readNodeFile(fileName);
|
||||
if (!scene)
|
||||
{
|
||||
printf("Could not load scene\n");
|
||||
return;
|
||||
}
|
||||
// Use VBO and EBO instead of display lists. CRITICAL for Emscripten
|
||||
// to skip FULL_ES2 emulation flag.
|
||||
VBOSetupVisitor vbo;
|
||||
scene->accept(vbo);
|
||||
// Load shaders.
|
||||
osg::Program *prog = createShaderProgram(shaderVertex, shaderFragment);
|
||||
// Apply shaders.
|
||||
scene->getOrCreateStateSet()->setAttribute(prog);
|
||||
// Set scene.
|
||||
mViewer->setSceneData(scene);
|
||||
}
|
||||
void setupWindow(int width, int height)
|
||||
{
|
||||
mViewer->setUpViewerAsEmbeddedInWindow(0, 0, width, height);
|
||||
}
|
||||
void frame()
|
||||
{
|
||||
mViewer->frame();
|
||||
}
|
||||
|
||||
private:
|
||||
void setupLogging()
|
||||
{
|
||||
// Create custom logger.
|
||||
mLogger = new Logger;
|
||||
// Provide the logger to OpenSceneGraph.
|
||||
osg::setNotifyHandler(mLogger);
|
||||
// Only accept notifications of Info level or higher
|
||||
// like warnings and errors.
|
||||
osg::setNotifyLevel(osg::INFO);
|
||||
}
|
||||
void setupRendering()
|
||||
{
|
||||
// Create OpenSceneGraph viewer.
|
||||
mViewer = new osgViewer::Viewer;
|
||||
// Use single thread: CRITICAL for Emscripten.
|
||||
mViewer->setThreadingModel(osgViewer::ViewerBase::SingleThreaded);
|
||||
// Create manipulator: CRITICAL for Emscripten.
|
||||
mViewer->setCameraManipulator(new osgGA::TrackballManipulator);
|
||||
}
|
||||
void tearDownLogging()
|
||||
{
|
||||
// Remove the logger from OpenSceneGraph.
|
||||
// This also destroys the logger: no need to deallocate it manually.
|
||||
osg::setNotifyHandler(0);
|
||||
}
|
||||
void tearDownRendering()
|
||||
{
|
||||
delete mViewer;
|
||||
}
|
||||
|
||||
private:
|
||||
Logger *mLogger;
|
||||
osgViewer::Viewer *mViewer;
|
||||
};
|
||||
|
||||
#endif // OSGEMSCRIPTEN_OSGEMSCRIPTEN_H
|
||||
@ -47,6 +47,9 @@
|
||||
#else
|
||||
#include <dlfcn.h>
|
||||
#endif
|
||||
#elif defined(__EMSCRIPTEN__)
|
||||
// Emscripten ships SDL, which we use to get OpenGL function addresses.
|
||||
#include <SDL2/SDL.h>
|
||||
#else
|
||||
#include <dlfcn.h>
|
||||
#endif
|
||||
@ -407,6 +410,10 @@ OSG_INIT_SINGLETON_PROXY(GLExtensionDisableStringInitializationProxy, osg::getGL
|
||||
|
||||
return dlsym(RTLD_DEFAULT, funcName);
|
||||
|
||||
#elif defined(__EMSCRIPTEN__)
|
||||
// Use SDL to get OpenGL function address for Emscripten.
|
||||
return SDL_GL_GetProcAddress(funcName);
|
||||
|
||||
#else // all other unixes
|
||||
|
||||
return dlsym(0, funcName);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user