Test of using glXGetProcAddress().
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Robert Osfield
parent
675be3efe1
commit
fd80861510
@ -18,6 +18,7 @@
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#include <osg/Shader>
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#include <osgUtil/Optimizer>
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class DrawMeshTasks : public osg::Drawable
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{
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public:
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@ -40,9 +41,17 @@ public:
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virtual void drawImplementation(osg::RenderInfo& renderInfo) const
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{
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const osg::GLExtensions* extensions = renderInfo.getState()->get<osg::GLExtensions>();
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if (extensions->isMeshShaderSupported && extensions->glDrawMeshTasksNV)
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void* (* my_glXGetProcAddress) (const GLchar *name);
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osg::setGLExtensionFuncPtr(my_glXGetProcAddress, "glXGetProcAddress", "glXGetProcAddressARB");
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void (GL_APIENTRY * my_glDrawMeshTasksNV) (GLuint first, GLuint count);
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osg::convertPointer(my_glDrawMeshTasksNV, my_glXGetProcAddress("glDrawMeshTasksNV"));
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if (extensions->isMeshShaderSupported && my_glDrawMeshTasksNV)
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{
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extensions->glDrawMeshTasksNV(first, count);
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my_glDrawMeshTasksNV(first, count);
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}
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else
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{
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@ -55,7 +64,6 @@ int main( int argc, char** argv )
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{
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osg::ArgumentParser arguments( &argc, argv );
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static const char* meshSource = \
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"#version 450 \n"
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"#extension GL_NV_mesh_shader : enable\n"
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@ -92,111 +100,14 @@ int main( int argc, char** argv )
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osg::ref_ptr<osg::Node> drawMesh = new DrawMeshTasks(0, 1);
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drawMesh->getOrCreateStateSet()->setAttribute( program.get() );
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const int width( 800 ), height( 450 );
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const std::string version( "4.6" );
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osg::ref_ptr< osg::GraphicsContext::Traits > traits = new osg::GraphicsContext::Traits();
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traits->x = 20; traits->y = 30;
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traits->width = width; traits->height = height;
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traits->windowDecoration = true;
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traits->doubleBuffer = true;
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traits->glContextVersion = version;
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traits->readDISPLAY();
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traits->setUndefinedScreenDetailsToDefaultScreen();
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osg::ref_ptr< osg::GraphicsContext > gc = osg::GraphicsContext::createGraphicsContext( traits.get() );
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if( !gc.valid() )
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{
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osg::notify( osg::FATAL ) << "Unable to create OpenGL v" << version << " context." << std::endl;
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return( 1 );
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}
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osgViewer::Viewer viewer;
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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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cam->setGraphicsContext( gc.get() );
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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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osgViewer::Viewer viewer(arguments);
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viewer.setSceneData( drawMesh );
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viewer.setLight( 0 );
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viewer.setLightingMode( osg::View::NO_LIGHT );
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// for non GL3/GL4 and non GLES2 platforms we need enable the osg_ uniforms that the shaders will use,
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// you don't need thse two lines on GL3/GL4 and GLES2 specific builds as these will be enable by default.
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gc->getState()->setUseModelViewAndProjectionUniforms(true);
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gc->getState()->setUseVertexAttributeAliasing(true);
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//gc->getState()->setUseModelViewAndProjectionUniforms(true);
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//gc->getState()->setUseVertexAttributeAliasing(true);
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return( viewer.run() );
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}
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/*
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Building OSG for OpenGL 3.x
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OSG currently support OpenGL 3.x on Windows. This comment block describes the
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necessary configuration steps.
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Get the draft gl3.h header file from OpenGL.org and put it in a folder called
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“GL3” somewhere on your hard drive. OSG includes this header as <GL3/gl3.h>. Get
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gl3.h from here:
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http://www.opengl.org/registry/
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Open the cmake-gui and load OSG's top-level CmakeLists.txt. You'll need to make
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several changes.
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* Add the path to <GL3/gl3.h> to the CMake compiler flags, CMAKE_CXX_FLAGS and
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CMAKE_CXX_FLAGS_DEBUG (for release and debug builds; others if you use other
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build configurations). The text to add should look something like this:
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/I “C:\GLHeader”
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The folder GLHeader should contain a subfolder GL3, which in turn contains
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gl3.h.
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* Enable the following CMake variable:
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OSG_GL3_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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OSG_GL_DISPLAYLISTS_AVAILABLE
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OSG_GL_FIXED_FUNCTION_AVAILABLE
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OSG_GL_MATRICES_AVAILABLE
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OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
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OSG_GL_VERTEX_FUNCS_AVAILABLE
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Create your project files in cmake-gui as usual, and build OSG as usual.
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If you have an external project that will depend on OSG built for OpenGL 3.x,
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you'll need to ensure your external project also uses the compiler include
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directives to find <GL3/gl3.h>.
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To verify your application is using a pure OpenGL 3.x context, set
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OSG_NOTIFY_LEVEL=INFO in the environment and check the console output. Context
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creation displays output such as the following:
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GL3: Attempting to create OpenGL3 context.
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GL3: version: 3.1
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GL3: context flags: 0
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GL3: profile: 0
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GL3: context created successfully.
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When your app begins rendering, it displays information about the actual context
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it is using:
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glVersion=3.1, isGlslSupported=YES, glslLanguageVersion=1.4
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--
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Under Linux the follow is sufficient to configure the OSG build for a GL3 core profile build:
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cmake . -DOSG_GL3_AVAILABLE=ON \
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-DOSG_GL1_AVAILABLE=OFF -DOSG_GL2_AVAILABLE=OFF -DOSG_GLES1_AVAILABLE=OFF -DOSG_GLES2_AVAILABLE=OFF \
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-DOSG_GL_DISPLAYLISTS_AVAILABLE=OFF -DOSG_GL_FIXED_FUNCTION_AVAILABLE=OFF -DOSG_GL_MATRICES_AVAILABLE=OFF \
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-DOSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE=OFF -DOSG_GL_VERTEX_FUNCS_AVAILABLE=OFF
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*/
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