From Wang Rui, "In the attached files I've added the Compute Shader support for OSG, as well as serializer updates and a new osgcomputeshaders example. My submission also include a setComputeGroups() function in Program for setting compute-shader work groups, and a bindToImageUnit() function in Texture for binding textures as image variables in shaders.

All code are tested on Windows 7 + NVIDIA GFX 570 with the latest GeForce 310.70 Driver (BETA), which could support OpenGL 4.3.

Compute shader information can be found at "http://www.opengl.org/registry/specs/ARB/compute_shader.txt"
"

src/osgWrappers/serializers/osg/Program.cpp

@@ -77,6 +77,30 @@ static bool writeShaders( osgDB::OutputStream& os, const osg::Program& attr )
     return true;
 }
 
+// _numGroupsX/Y/Z
+static bool checkComputeGroups( const osg::Program& attr )
+{
+    GLint numX = 0, numY = 0, numZ = 0;
+    attr.getComputeGroups( numX, numY, numZ );
+    return numX>0 && numY>0 && numZ>0;
+}
+
+static bool readComputeGroups( osgDB::InputStream& is, osg::Program& attr )
+{
+    GLint numX = 0, numY = 0, numZ = 0;
+    is >> numX >> numY >> numZ;
+    attr.setComputeGroups( numX, numY, numZ );
+    return true;
+}
+
+static bool writeComputeGroups( osgDB::OutputStream& os, const osg::Program& attr )
+{
+    GLint numX = 0, numY = 0, numZ = 0;
+    attr.getComputeGroups( numX, numY, numZ );
+    os << numX << numY << numZ << std::endl;
+    return true;
+}
+
 REGISTER_OBJECT_WRAPPER( Program,
                          new osg::Program,
                          osg::Program,
@@ -88,4 +112,8 @@ REGISTER_OBJECT_WRAPPER( Program,
     ADD_USER_SERIALIZER( GeometryVerticesOut );  // _geometryVerticesOut
     ADD_USER_SERIALIZER( GeometryInputType );  // _geometryInputType
     ADD_USER_SERIALIZER( GeometryOutputType );  // _geometryOutputType
+    {
+        UPDATE_TO_VERSION_SCOPED( 95 )
+        ADD_USER_SERIALIZER( ComputeGroups );  // _numGroupsX/Y/Z
+    }
 }