104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
// This is public domain software and comes with
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// absolutely no warranty. Use of public domain software
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// may vary between counties, but in general you are free
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// to use and distribute this software for any purpose.
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// Example: OSG using EGL.
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// The comment block at the end of the source describes building OSG
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// for use with OpenGL 3.x.
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#include <osgViewer/Viewer>
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#include <osg/GraphicsContext>
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#include <osg/Camera>
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#include <osg/Viewport>
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#include <osg/StateSet>
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#include <osg/Program>
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#include <osg/Shader>
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osg::Geode* makeGeometry(float v)
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{
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osg::Geode* geode = new osg::Geode();
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osg::Geometry* geom = new osg::Geometry();
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osg::Vec3Array* verts = new osg::Vec3Array();
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verts->push_back(osg::Vec3(v - 1, 0, 0));
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verts->push_back(osg::Vec3(v + 1, 0, 0));
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verts->push_back(osg::Vec3(v, 0, 2));
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geom->setVertexArray(verts);
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geom->setUseVertexBufferObjects(true);
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osg::Vec4Array* colors = new osg::Vec4Array(osg::Array::BIND_OVERALL);
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colors->push_back(osg::Vec4(0, 0, 1, 1));
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geom->setColorArray(colors);
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geom->addPrimitiveSet(new osg::DrawArrays(GL_TRIANGLES, 0, 3));
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geode->addDrawable(geom);
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return geode;
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}
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int main( int argc, char** argv )
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{
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osg::ArgumentParser arguments( &argc, argv );
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osgViewer::Viewer viewer(arguments);
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viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded);
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osg::Geode* geode = makeGeometry(1.0);
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const std::string vertexSource =
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"#version 300 es\n"
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"void main() { \n"
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" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; \n"
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"} \n";
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osg::Shader* vShader = new osg::Shader(osg::Shader::VERTEX, vertexSource);
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const std::string fragmentSource =
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"#version 300 es\n"
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"precision mediump float;\n"
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"out vec4 color;\n"
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"void main() { \n"
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" color = vec4(0.5, 0.3, 0.3, 1.0);\n"
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"} \n";
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osg::Shader* fShader = new osg::Shader(osg::Shader::FRAGMENT, fragmentSource);
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osg::Program* program = new osg::Program;
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program->addShader(vShader);
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program->addShader(fShader);
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geode->getOrCreateStateSet()->setAttributeAndModes(program, osg::StateAttribute::ON | osg::StateAttribute::PROTECTED);
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osg::Group* root = new osg::Group();
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root->addChild(geode);
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#if 0
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// Create a Camera that uses the above OpenGL context.
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osg::Camera* cam = viewer.getCamera();
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// Must set perspective projection for fovy and aspect.
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cam->setProjectionMatrix( osg::Matrix::perspective( 30., (double)width/(double)height, 1., 100. ) );
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// Unlike OpenGL, OSG viewport does *not* default to window dimensions.
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cam->setViewport( new osg::Viewport( 0, 0, width, height ) );
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#endif
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viewer.setSceneData( root );
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return( viewer.run() );
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}
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/*
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Building OSG for OpenGLES3
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OSG currently support GLES3 on Windows. This comment block describes the
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necessary configuration steps.
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* Add Google Angle libraries and include folder to CMake
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CMake use FindEGL.cmake to find this. The library name of Google-Angle for Windows is "libEGL.dll.lib"
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* Enable the following CMake variable:
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OSG_GLES3_AVAILABLE
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* Disable the following CMake variables:
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OSG_GL1_AVAILABLE
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OSG_GL2_AVAILABLE
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OSG_GLES1_AVAILABLE
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OSG_GLES2_AVAILABLE
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*/
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