/// <summary>
/// Query the OpenGL implementation limits.
/// </summary>
/// <param name="version">
/// The <see cref="KhronosVersion"/> that specifies the GL version.
/// </param>
/// <param name="glExtensions">
/// A <see cref="Gl.Extensions"/> that specify the supported OpenGL extension by the current
/// implementation.
/// </param>
/// <returns>
/// It returns a <see cref="Gl.Limits"/> that specify the current OpenGL implementation limits.
/// </returns>
/// <remarks>
/// It is assumed to have a valid OpenGL context current on the calling thread.
/// </remarks>
public static Limits Query(KhronosVersion version, Extensions glExtensions)
{
if (glExtensions == null)
{
throw new ArgumentNullException("glExtensions");
}
LogComment("Query OpenGL implementation limits.");
Limits graphicsLimits = new Limits();
#if NETSTANDARD1_1 || NETSTANDARD1_4
IEnumerable <FieldInfo> graphicsLimitsFields = typeof(Limits).GetTypeInfo().DeclaredFields;
#else
IEnumerable <FieldInfo> graphicsLimitsFields = typeof(Limits).GetFields(BindingFlags.Public | BindingFlags.Instance);
#endif
foreach (FieldInfo field in graphicsLimitsFields)
{
#if NETSTANDARD1_1 || NETSTANDARD1_4 || NETCORE
LimitAttribute graphicsLimitAttribute = (LimitAttribute)field.GetCustomAttribute(typeof(LimitAttribute));
Attribute[] graphicsExtensionAttributes = new List <Attribute>(field.GetCustomAttributes(typeof(RequiredByFeatureAttribute))).ToArray();
#else
LimitAttribute graphicsLimitAttribute = (LimitAttribute)Attribute.GetCustomAttribute(field, typeof(LimitAttribute));
Attribute[] graphicsExtensionAttributes = Attribute.GetCustomAttributes(field, typeof(RequiredByFeatureAttribute));
#endif
MethodInfo getMethod;
if (graphicsLimitAttribute == null)
{
continue;
}
// Check extension support
if ((graphicsExtensionAttributes != null) && (graphicsExtensionAttributes.Length > 0))
{
bool supported = Array.Exists(graphicsExtensionAttributes, delegate(Attribute item) {
RequiredByFeatureAttribute featureAttribute = (RequiredByFeatureAttribute)item;
return(featureAttribute.IsSupported(version, glExtensions));
});
if (supported == false)
{
continue;
}
}
// Determine which method is used to get the OpenGL limit
#if NETSTANDARD1_1 || NETSTANDARD1_4
if (field.FieldType != typeof(String))
{
if (field.FieldType.IsArray == true)
{
getMethod = typeof(Gl).GetTypeInfo().GetDeclaredMethod("Get");
}
else
{
getMethod = typeof(Gl).GetTypeInfo().GetDeclaredMethod("Get");
}
}
else
{
getMethod = typeof(Gl).GetTypeInfo().GetDeclaredMethod("GetString");
}
#elif NETCORE
if (field.FieldType != typeof(String))
{
if (field.FieldType.IsArray == true)
{
getMethod = typeof(Gl).GetMethod("Get", new Type[] { typeof(Int32), field.FieldType });
}
else
{
getMethod = typeof(Gl).GetMethod("Get", new Type[] { typeof(Int32), field.FieldType.MakeByRefType() });
}
}
else
{
getMethod = typeof(Gl).GetMethod("GetString", new Type[] { typeof(Int32) });
}
#else
if (field.FieldType != typeof(String))
{
if (field.FieldType.IsArray == true)
{
getMethod = typeof(Gl).GetMethod("Get", BindingFlags.Public | BindingFlags.Static, null, new Type[] { typeof(Int32), field.FieldType }, null);
}
else
{
getMethod = typeof(Gl).GetMethod("Get", BindingFlags.Public | BindingFlags.Static, null, new Type[] { typeof(Int32), field.FieldType.MakeByRefType() }, null);
}
}
else
{
getMethod = typeof(Gl).GetMethod("GetString", BindingFlags.Public | BindingFlags.Static, null, new Type[] { typeof(Int32) }, null);
}
#endif
if (getMethod != null)
{
if (field.FieldType != typeof(String))
{
object obj;
if (field.FieldType.IsArray == false)
{
obj = Activator.CreateInstance(field.FieldType);
}
else
{
obj = Array.CreateInstance(field.FieldType.GetElementType(), (int)graphicsLimitAttribute.ArrayLength);
}
try {
object[] @params = new object[] { graphicsLimitAttribute.EnumValue, obj };
getMethod.Invoke(null, @params);
field.SetValue(graphicsLimits, @params[1]);
} catch (GlException) {
} catch (Exception) {
}
}
else
{
try {
string s = (string)getMethod.Invoke(null, new object[] { graphicsLimitAttribute.EnumValue });
field.SetValue(graphicsLimits, s);
} catch (GlException) {
} catch (Exception) {
}
}
}
else
{
throw new InvalidOperationException("GraphicsLimits field " + field.Name + " doesn't have a OpenGL compatible type");
}
}
return(graphicsLimits);
}
/// <summary>
/// Check whether commands implemented by the current driver have a corresponding extension declaring the
/// support of them.
/// </summary>
/// <typeparam name="T">
/// The type of the KhronosApi to inspect for commands.
/// </typeparam>
/// <param name="version">
/// The <see cref="KhronosVersion"/> currently implemented by the current context on this thread.
/// </param>
/// <param name="extensions">
/// The <see cref="ExtensionsCollection"/> that specifies the extensions supported by the driver.
/// </param>
protected static void CheckExtensionCommands <T>(KhronosVersion version, ExtensionsCollection extensions, bool enableExtensions) where T : KhronosApi
{
if (version == null)
{
throw new ArgumentNullException("version");
}
if (extensions == null)
{
throw new ArgumentNullException("extensions");
}
#if !NETCORE
Type apiType = typeof(T);
FunctionContext functionContext = GetFunctionContext(apiType);
Debug.Assert(functionContext != null);
if (functionContext == null)
{
throw new InvalidOperationException("unrecognized API type");
}
LogComment("Checking commands for {0}", version);
Dictionary <string, List <Type> > hiddenVersions = new Dictionary <string, List <Type> >();
Dictionary <string, bool> hiddenExtensions = new Dictionary <string, bool>();
foreach (FieldInfo fi in functionContext.Delegates)
{
Delegate fiDelegateType = (Delegate)fi.GetValue(null);
string commandName = fi.Name.Substring(3);
bool commandDefined = fiDelegateType != null;
bool supportedByFeature = false;
Type delegateType = fi.DeclaringType.GetNestedType(fi.Name.Substring(1), BindingFlags.Public | BindingFlags.NonPublic);
IEnumerable <object> requiredByFeatureAttributes = delegateType.GetCustomAttributes(typeof(RequiredByFeatureAttribute), false);
foreach (RequiredByFeatureAttribute requiredByFeatureAttribute in requiredByFeatureAttributes)
{
supportedByFeature |= requiredByFeatureAttribute.IsSupported(version, extensions);
}
// Find the underlying extension
RequiredByFeatureAttribute hiddenVersionAttrib = null;
RequiredByFeatureAttribute hiddenExtensionAttrib = null;
foreach (RequiredByFeatureAttribute requiredByFeatureAttribute in requiredByFeatureAttributes)
{
if (requiredByFeatureAttribute.IsSupportedApi(version.Api) == false)
{
// Version attribute
if (hiddenVersionAttrib == null)
{
hiddenVersionAttrib = requiredByFeatureAttribute;
}
}
else
{
// Extension attribute
if (hiddenExtensionAttrib == null)
{
hiddenExtensionAttrib = requiredByFeatureAttribute;
}
}
}
if (commandDefined != supportedByFeature)
{
#if DEBUG_VERBOSE
string supportString = "any feature";
if (hiddenVersionAttrib != null)
{
supportString = hiddenVersionAttrib.FeatureName;
if (hiddenExtensionAttrib != null)
{
supportString += " or ";
}
}
if (hiddenExtensionAttrib != null)
{
if (hiddenVersionAttrib == null)
{
supportString = String.Empty;
}
supportString += hiddenExtensionAttrib.FeatureName;
}
#endif
if (commandDefined)
{
#if DEBUG_VERBOSE
LogComment("The command {0} is defined, but {1} support is not advertised.", commandName, supportString);
#endif
if (hiddenVersionAttrib != null && hiddenExtensionAttrib == null)
{
List <Type> versionDelegates = new List <Type>();
if (hiddenVersions.TryGetValue(hiddenVersionAttrib.FeatureName, out versionDelegates) == false)
{
hiddenVersions.Add(hiddenVersionAttrib.FeatureName, versionDelegates = new List <Type>());
}
versionDelegates.Add(delegateType);
}
if (hiddenExtensionAttrib != null)
{
// Eventually leave to false for incomplete extensions
if (hiddenExtensions.ContainsKey(hiddenExtensionAttrib.FeatureName) == false)
{
hiddenExtensions.Add(hiddenExtensionAttrib.FeatureName, true);
}
}
}
else
{
#if DEBUG_VERBOSE
LogComment("The command {0} is not defined, but required by some feature.", commandName);
#endif
}
}
// Partial extensions are not supported
if (hiddenExtensionAttrib != null && commandDefined == false && hiddenExtensions.ContainsKey(hiddenExtensionAttrib.FeatureName))
{
hiddenExtensions[hiddenExtensionAttrib.FeatureName] = false;
}
}
if (hiddenExtensions.Count > 0)
{
LogComment("Found {0} experimental extensions:", hiddenExtensions.Count);
foreach (KeyValuePair <string, bool> hiddenExtension in hiddenExtensions)
{
LogComment("- {0}: {1}", hiddenExtension.Key, hiddenExtension.Value ? "experimental" : "experimental (partial, unsupported)");
}
}
if (hiddenVersions.Count > 0)
{
LogComment("Found {0} experimental version commands:", hiddenVersions.Count);
foreach (KeyValuePair <string, List <Type> > hiddenVersion in hiddenVersions)
{
LogComment("- {0}", hiddenVersion.Key);
foreach (Type delegateType in hiddenVersion.Value)
{
LogComment(" > {0}", delegateType.Name);
}
}
}
if (enableExtensions)
{
bool sync = false;
foreach (KeyValuePair <string, bool> hiddenExtension in hiddenExtensions)
{
if (hiddenExtension.Value == false)
{
continue; // Do not enable partial extension
}
extensions.EnableExtension(hiddenExtension.Key);
sync = true;
}
if (sync)
{
extensions.SyncMembers(version);
}
}
#endif
}
