Added osg::ShaderBinary::readShaderBinaryFile(..) static method

include/osg/Shader

@@ -58,6 +58,10 @@ class OSG_EXPORT ShaderBinary : public osg::Object
         /** Get a const ptr to the shader binary data.*/
         const unsigned char* getData() const { return _data.empty() ? 0 : &(_data.front()); }
 
+        /** Read shader binary from file.
+          * Return the resulting Shader or 0 if no valid shader binary could be read.*/
+        static ShaderBinary* readShaderBinaryFile(const std::string& fileName);
+
     protected:
 
         typedef std::vector<unsigned char> Data;
@@ -132,7 +136,7 @@ class OSG_EXPORT Shader : public osg::Object
 
 
         /** Read shader source from file and then constructor shader of specified type.
-          * Return the resulting Shader or 0 if no valid shader source code be read.*/
+          * Return the resulting Shader or 0 if no valid shader source could be read.*/
         static Shader* readShaderFile( Type type, const std::string& fileName );
 
         /** Load the Shader's source code text from a file. */

src/osg/Shader.cpp

@@ -63,6 +63,25 @@ void ShaderBinary::assign(unsigned int size, const unsigned char* data)
     }
 }
 
+ShaderBinary* ShaderBinary::readShaderBinaryFile(const std::string& fileName)
+{
+    std::ifstream fin;
+    fin.open(fileName.c_str(), std::ios::binary);
+    if (!fin) return 0;
+
+    fin.seekg(0, std::ios::end);
+    int length = fin.tellg();
+    if (length==0) return 0;
+
+    osg::ref_ptr<ShaderBinary> shaderBinary = new osg::ShaderBinary;
+    shaderBinary->allocate(length);
+    fin.seekg(0, std::ios::beg);
+    fin.read(reinterpret_cast<char*>(shaderBinary->getData()), length);
+    fin.close();
+
+    return shaderBinary.release();
+}
+
 ///////////////////////////////////////////////////////////////////////////
 // static cache of glShaders flagged for deletion, which will actually
 // be deleted in the correct GL context.