/// <summary>
/// Link delegates fields using import declarations.
/// </summary>
/// <param name="path">
/// A <see cref="String"/> that specifies the assembly file path containing the import functions.
/// </param>
/// <param name="functionContext">
/// A <see cref="FunctionContext"/> mapping a <see cref="MethodInfo"/> with the relative function name.
/// </param>
/// <param name="function">
/// A <see cref="FieldInfo"/> that specifies the underlying function field to be updated.
/// </param>
/// <param name="getAddress">
/// A <see cref="GetAddressDelegate"/> used for getting function pointers. This parameter is dependent on the currently running platform.
/// </param>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="path"/>, <paramref name="function"/> or <paramref name="getAddress"/> is null.
/// </exception>
private static void BindAPIFunction(string path, FunctionContext functionContext, FieldInfo function, GetAddressDelegate getAddress)
{
if (path == null)
{
throw new ArgumentNullException("path");
}
if (functionContext == null)
{
throw new ArgumentNullException("functionContext");
}
if (function == null)
{
throw new ArgumentNullException("function");
}
if (getAddress == null)
{
throw new ArgumentNullException("getAddress");
}
Attribute[] aliasOfAttributes = Attribute.GetCustomAttributes(function, typeof(AliasOfAttribute));
string importName = function.Name.Substring(1); // Delegate name always prefixes with 'p'
IntPtr importAddress = IntPtr.Zero;
// Manages aliases (load external symbol)
if (aliasOfAttributes.Length > 0)
{
for (int i = 0; i < aliasOfAttributes.Length; i++)
{
AliasOfAttribute aliasOfAttribute = (AliasOfAttribute)aliasOfAttributes[i];
if ((importAddress = getAddress(path, aliasOfAttribute.SymbolName)) != IntPtr.Zero)
{
break;
}
}
}
else
{
importAddress = getAddress(path, importName);
}
if (importAddress != IntPtr.Zero)
{
Delegate delegatePtr;
// Try to load external symbol
if ((delegatePtr = Marshal.GetDelegateForFunctionPointer(importAddress, function.FieldType)) == null)
{
MethodInfo methodInfo;
if (functionContext.Imports.TryGetValue(importName, out methodInfo) == true)
{
delegatePtr = Delegate.CreateDelegate(function.FieldType, methodInfo);
}
}
if (delegatePtr != null)
{
function.SetValue(null, delegatePtr);
}
}
else
{
function.SetValue(null, null); // Function not implemented
}
}
/// <summary>
/// Link delegates fields using import declarations.
/// </summary>
/// <param name="path">
/// A <see cref="String"/> that specifies the assembly file path containing the import functions.
/// </param>
/// <param name="getAddress">
/// A <see cref="GetAddressDelegate"/> used for getting function pointers. This parameter is dependent on the currently running platform.
/// </param>
/// <param name="functionContext">
/// A <see cref="FunctionContext"/> mapping a <see cref="MethodInfo"/> with the relative function name.
/// </param>
/// <param name="function">
/// A <see cref="FieldInfo"/> that specifies the underlying function field to be updated.
/// </param>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="path"/>, <paramref name="function"/> or <paramref name="getAddress"/> is null.
/// </exception>
private static void BindAPIFunction(string path, GetAddressDelegate getAddress, FunctionContext functionContext, FieldInfo function, KhronosVersion version, ExtensionsCollection extensions)
{
if (path == null)
{
throw new ArgumentNullException("path");
}
if (functionContext == null)
{
throw new ArgumentNullException("functionContext");
}
if (function == null)
{
throw new ArgumentNullException("function");
}
if (getAddress == null)
{
throw new ArgumentNullException("getAddress");
}
if (version != null || extensions != null)
{
if (IsCompatibleField(function, version, extensions) == false)
{
function.SetValue(null, null); // Function not supported: reset
return;
}
}
string importName = function.Name.Substring(1); // Delegate name always prefixes with 'p'
IntPtr importAddress = IntPtr.Zero;
// Load command address
importAddress = getAddress(path, importName);
// Manages aliases (load external symbol)
if (importAddress == IntPtr.Zero)
{
#if !NETCORE
Attribute[] aliasOfAttributes = Attribute.GetCustomAttributes(function, typeof(AliasOfAttribute));
#else
Attribute[] aliasOfAttributes = new List <Attribute>(function.GetCustomAttributes(typeof(AliasOfAttribute))).ToArray();
#endif
for (int i = 1 /* Skip base name */; i < aliasOfAttributes.Length; i++)
{
AliasOfAttribute aliasOfAttribute = (AliasOfAttribute)aliasOfAttributes[i];
if ((importAddress = getAddress(path, aliasOfAttribute.SymbolName)) != IntPtr.Zero)
{
break;
}
}
}
if (importAddress != IntPtr.Zero)
{
Delegate delegatePtr;
// Try to load external symbol
if ((delegatePtr = Marshal.GetDelegateForFunctionPointer(importAddress, function.FieldType)) == null)
{
MethodInfo methodInfo;
if (functionContext.Imports.TryGetValue(importName, out methodInfo) == true)
{
#if !NETCORE
delegatePtr = Delegate.CreateDelegate(function.FieldType, methodInfo);
#else
delegatePtr = methodInfo.CreateDelegate(function.FieldType);
#endif
}
}
if (delegatePtr != null)
{
function.SetValue(null, delegatePtr);
}
}
else
{
function.SetValue(null, null); // Function not implemented: reset
}
}
