public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
{
if (Object.ReferenceEquals(value, null))
{
return(base.ConvertFrom(context, culture, value));
}
Type valueType = value.GetType();
if (valueType == typeof(string))
{
try {
string valueString = (string)value;
if (valueString == String.Empty)
{
return(null);
}
return(KhronosVersion.Parse(valueString));
} catch (Exception exception) {
throw new NotSupportedException("unable to parse the value", exception);
}
}
// Base implementation
return(base.ConvertFrom(context, culture, value));
}
/// <summary>
/// Query the extensions supported by current platform.
/// </summary>
/// <remarks>
/// An OpenGL context must be current on the calling thread.
/// </remarks>
public void Query()
{
LogComment("Query GL extensions.");
string glVersionString = GetString(StringName.Version);
if (glVersionString == null)
{
throw new InvalidOperationException("unable to determine OpenGL version");
}
KhronosVersion glVersion = KhronosVersion.Parse(glVersionString);
bool indexedExtensions = (glVersion.Major >= 3) && (Delegates.pglGetStringi != null);
if (indexedExtensions)
{
int extensionCount;
Get(GetPName.NumExtensions, out extensionCount);
List <string> extensions = new List <string>();
for (uint i = 0; i < (uint)extensionCount; i++)
{
extensions.Add(GetString(StringName.Extensions, i));
}
Query(glVersion, extensions.ToArray());
}
else
{
Query(glVersion, GetString(StringName.Extensions));
}
}
/// <summary>
/// Query the version of the current OpenGL context.
/// </summary>
/// <returns>
/// It returns the <see cref="KhronosVersion"/> specifying the actual version of the context current on this thread.
/// </returns>
/// <exception cref="InvalidOperationException">
/// Exception thrown if no GL context is current on the calling thread.
/// </exception>
public static KhronosVersion QueryContextVersion()
{
// Parse version string (effective for detecting Desktop and ES contextes)
KhronosVersion glversion = KhronosVersion.Parse(GetString(StringName.Version));
// Context profile
if (glversion.Api == KhronosVersion.ApiGl && glversion >= Version_320)
{
string glProfile;
int ctxProfile;
Get(CONTEXT_PROFILE_MASK, out ctxProfile);
if ((ctxProfile & CONTEXT_COMPATIBILITY_PROFILE_BIT) != 0)
{
glProfile = KhronosVersion.ProfileCompatibility;
}
else if ((ctxProfile & CONTEXT_CORE_PROFILE_BIT) != 0)
{
glProfile = KhronosVersion.ProfileCore;
}
else
{
glProfile = KhronosVersion.ProfileCompatibility;
}
return(new KhronosVersion(glversion, glProfile));
}
else
{
return(new KhronosVersion(glversion, KhronosVersion.ProfileCompatibility));
}
}
/// <summary>
/// Query the version of the current OpenGL context.
/// </summary>
/// <returns>
/// It returns the <see cref="KhronosVersion"/> specifying teh actual version of <paramref name="ctx"/>.
/// </returns>
internal static KhronosVersion QueryContextVersion()
{
IntPtr ctx = GetCurrentContext();
if (ctx == null)
{
throw new InvalidOperationException("no current context");
}
// Load minimal Gl functions for querying information
IGetProcAddress getProcAddress = GetProcAddress.GetProcAddressGL;
if (Egl.IsRequired == false)
{
Gl.BindAPIFunction(Gl.Version_100, "glGetError", getProcAddress);
Gl.BindAPIFunction(Gl.Version_100, "glGetString", getProcAddress);
}
else
{
Gl.BindAPIFunction(Gl.Version_320_ES, "glGetError", getProcAddress);
Gl.BindAPIFunction(Gl.Version_320_ES, "glGetString", getProcAddress);
}
// Parse version string (effective for detecting Desktop and ES contextes)
KhronosVersion glversion = KhronosVersion.Parse(Gl.GetString(StringName.Version));
// ATM do not support fancy context creation flags
return(glversion);
}
/// <summary>
/// Query the version of the current OpenGL context.
/// </summary>
/// <returns>
/// It returns the <see cref="KhronosVersion"/> specifying teh actual version of <paramref name="ctx"/>.
/// </returns>
private static KhronosVersion QueryContextVersion()
{
IntPtr ctx = DeviceContext.GetCurrentContext();
if (ctx == null)
{
throw new InvalidOperationException("no current context");
}
// Load minimal Gl functions for querying information
IGetProcAddress getProcAddress = GetProcAddress.GetProcAddressGL;
if (Egl.IsRequired == false)
{
Gl.BindAPIFunction(Gl.Version_100, null, "glGetError", getProcAddress);
Gl.BindAPIFunction(Gl.Version_100, null, "glGetString", getProcAddress);
Gl.BindAPIFunction(Gl.Version_100, null, "glGetIntegerv", getProcAddress);
}
else
{
Gl.BindAPIFunction(Gl.Version_320_ES, null, "glGetError", getProcAddress);
Gl.BindAPIFunction(Gl.Version_320_ES, null, "glGetString", getProcAddress);
Gl.BindAPIFunction(Gl.Version_320_ES, null, "glGetIntegerv", getProcAddress);
}
// Parse version string (effective for detecting Desktop and ES contextes)
KhronosVersion glversion = KhronosVersion.Parse(Gl.GetString(StringName.Version));
// Context profile
if (glversion.Api == KhronosVersion.ApiGl && glversion >= Gl.Version_320)
{
string glProfile = null;
int ctxProfile = 0;
Gl.Get(Gl.CONTEXT_PROFILE_MASK, out ctxProfile);
if ((ctxProfile & Gl.CONTEXT_COMPATIBILITY_PROFILE_BIT) != 0)
{
glProfile = KhronosVersion.ProfileCompatibility;
}
else if ((ctxProfile & Gl.CONTEXT_CORE_PROFILE_BIT) != 0)
{
glProfile = KhronosVersion.ProfileCore;
}
else
{
glProfile = KhronosVersion.ProfileCompatibility;
}
return(new KhronosVersion(glversion, glProfile));
}
else
{
return(new KhronosVersion(glversion, KhronosVersion.ProfileCompatibility));
}
}
/// <summary>
/// Query the OpenGL version without binding the API.
/// </summary>
/// <param name="procLoadFunction">The function OpenGL functions will be loaded through (in this case glGetString only).</param>
/// <returns>
/// It returns the <see cref="KhronosVersion" /> specifying the actual version of the context current on this
/// thread.
/// </returns>
public static KhronosVersion QueryVersionExternal(Func <string, IntPtr> procLoadFunction)
{
IntPtr func = procLoadFunction("glGetString");
if (func == IntPtr.Zero)
{
return(null);
}
var getString = Marshal.GetDelegateForFunctionPointer <Delegates.glGetString>(func);
IntPtr ptr = getString((int)StringName.Version);
string str = NativeHelpers.StringFromPtr(ptr);
return(KhronosVersion.Parse(str));
}
/// <summary>
/// Bind the OpenGL delegates for the API corresponding to the current OpenGL context.
/// </summary>
/// <param name="procLoadFunction">The function OpenGL functions will be loaded through. Should be provided by your context creator.</param>
public static void BindAPI(Func <string, IntPtr> procLoadFunction)
{
// Set the function loading function.
KhronosApi.ProcLoadFunction = procLoadFunction;
// Get version.
BindAPI(QueryContextVersionCore(), CurrentExtensions);
// Query OpenGL informations
string glVersion = GetString(StringName.Version);
_CurrentVersion = KhronosVersion.Parse(glVersion);
// Query OpenGL extensions (current OpenGL implementation, CurrentCaps)
_CurrentExtensions = new Extensions();
_CurrentExtensions.Query();
// Query OpenGL limits
_CurrentLimits = Limits.Query(CurrentVersion, _CurrentExtensions);
// Obtain current OpenGL Shading Language version
string glslVersion = null;
switch (_CurrentVersion.Api)
{
case KhronosVersion.ApiGl:
if (_CurrentVersion >= Version_200 || _CurrentExtensions.ShadingLanguage100_ARB)
{
glslVersion = GetString(StringName.ShadingLanguageVersion);
}
break;
case KhronosVersion.ApiGles2:
glslVersion = GetString(StringName.ShadingLanguageVersion);
break;
}
if (glslVersion != null)
{
_CurrentShadingVersion = GlslVersion.Parse(glslVersion, _CurrentVersion.Api);
}
// Vendor/Render information
_Vendor = GetString(StringName.Vendor);
_Renderer = GetString(StringName.Renderer);
}
/// <summary>
/// Query the OpenGL version. Requires some information lookup functions to be bound.
/// </summary>
/// <returns>The version of the current OpenGL context.</returns>
private static KhronosVersion QueryContextVersionInternal()
{
// Parse version string (effective for detecting Desktop and ES contextes)
string str = GetString(StringName.Version);
KhronosVersion glVersion = KhronosVersion.Parse(str);
// Vendor/Render information
CurrentVendor = GetString(StringName.Vendor);
CurrentRenderer = GetString(StringName.Renderer);
SoftwareRenderer = CurrentRenderer.Contains("llvmpipe");
// Context profile
if (glVersion.Api == KhronosVersion.API_GL && glVersion >= Version320)
{
string glProfile;
Get(CONTEXT_PROFILE_MASK, out int ctxProfile);
if ((ctxProfile & CONTEXT_COMPATIBILITY_PROFILE_BIT) != 0)
{
glProfile = KhronosVersion.PROFILE_COMPATIBILITY;
}
else if ((ctxProfile & CONTEXT_CORE_PROFILE_BIT) != 0)
{
glProfile = KhronosVersion.PROFILE_CORE;
}
else
{
glProfile = KhronosVersion.PROFILE_COMPATIBILITY;
}
return(new KhronosVersion(glVersion, glProfile));
}
else
{
string profile = KhronosVersion.PROFILE_COMPATIBILITY;
if (CurrentRenderer.Contains("WebGL"))
{
profile = KhronosVersion.PROFILE_WEBGL;
}
return(new KhronosVersion(glVersion, profile));
}
}
/// <summary>
/// Query the version of the current OpenGL context.
/// </summary>
/// <returns>
/// It returns the <see cref="KhronosVersion"/> specifying the actual version of the context current on this thread.
/// </returns>
/// <exception cref="InvalidOperationException">
/// Exception thrown if no GL context is current on the calling thread.
/// </exception>
public static KhronosVersion QueryContextVersion()
{
IntPtr ctx = DeviceContext.GetCurrentContext();
if (ctx == IntPtr.Zero)
{
throw new InvalidOperationException("no current context");
}
// Parse version string (effective for detecting Desktop and ES contextes)
KhronosVersion glversion = KhronosVersion.Parse(Gl.GetString(StringName.Version));
// Context profile
if (glversion.Api == KhronosVersion.ApiGl && glversion >= Gl.Version_320)
{
string glProfile = null;
int ctxProfile = 0;
Gl.Get(Gl.CONTEXT_PROFILE_MASK, out ctxProfile);
if ((ctxProfile & Gl.CONTEXT_COMPATIBILITY_PROFILE_BIT) != 0)
{
glProfile = KhronosVersion.ProfileCompatibility;
}
else if ((ctxProfile & Gl.CONTEXT_CORE_PROFILE_BIT) != 0)
{
glProfile = KhronosVersion.ProfileCore;
}
else
{
glProfile = KhronosVersion.ProfileCompatibility;
}
return(new KhronosVersion(glversion, glProfile));
}
else
{
return(new KhronosVersion(glversion, KhronosVersion.ProfileCompatibility));
}
}
/// <summary>
/// Query the version of the current OpenGL context.
/// </summary>
/// <returns>
/// It returns the <see cref="KhronosVersion" /> specifying the actual version of the context current on this thread.
/// </returns>
public static KhronosVersion QueryContextVersion()
{
BindAPIFunction <Gl>("glGetError", Version100, null);
BindAPIFunction <Gl>("glGetString", Version100, null);
BindAPIFunction <Gl>("glGetIntegerv", Version100, null);
// Parse version string (effective for detecting Desktop and ES contextes)
string str = GetString(StringName.Version);
KhronosVersion glVersion = KhronosVersion.Parse(str);
// Context profile
if (glVersion.Api == KhronosVersion.API_GL && glVersion >= Version320)
{
string glProfile;
Get(CONTEXT_PROFILE_MASK, out int ctxProfile);
if ((ctxProfile & CONTEXT_COMPATIBILITY_PROFILE_BIT) != 0)
{
glProfile = KhronosVersion.PROFILE_COMPATIBILITY;
}
else if ((ctxProfile & CONTEXT_CORE_PROFILE_BIT) != 0)
{
glProfile = KhronosVersion.PROFILE_CORE;
}
else
{
glProfile = KhronosVersion.PROFILE_COMPATIBILITY;
}
return(new KhronosVersion(glVersion, glProfile));
}
else
{
return(new KhronosVersion(glVersion, KhronosVersion.PROFILE_COMPATIBILITY));
}
}
public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
{
if (Object.ReferenceEquals(value, null))
{
return(base.ConvertFrom(context, culture, value));
}
Type valueType = value.GetType();
if (valueType == typeof(string))
{
string valueString = (string)value;
if (valueString == String.Empty)
{
return(null);
}
return(KhronosVersion.Parse(valueString));
}
// Base implementation
return(base.ConvertFrom(context, culture, value));
}
/// <summary>
/// Initialize OpenGL namespace static environment. This method shall be called before any other classes methods.
/// </summary>
public static void Initialize()
{
if (_Initialized == true)
{
return; // Already initialized
}
_Initialized = true;
#if !NETSTANDARD1_1
// Optional initialization
string envGlInit = Environment.GetEnvironmentVariable("OPENGL_NET_INIT");
if (envGlInit != null && envGlInit == "NO")
{
return;
}
#endif
// Environment options
LogComment("OpenGL.Net is initializing");
// Loader function OS API GL API
// ------------------------------------------------------
// Supported platform: Windows
// wglGetProcAddress WGL GL
// wglGetProcAddress WGL GLES2+ (with WGL_create_context_es(2)?_profile_EXT)
// eglGetProcAddress EGL(Angle) GLES2+
// ------------------------------------------------------
// Supported platform: Linux
// glXGetProcAddress GLX GL
// glXGetProcAddress GLX GLES2+ (with GLX_create_context_es(2)?_profile_EXT)
// eglGetProcAddress EGL GLES2+
// ------------------------------------------------------
// Supported platform: Android
// eglGetProcAddress EGL GL
// eglGetProcAddress EGL GLES2+
try {
#if !MONODROID
// Determine whether use EGL as device context backend
if (Egl.IsAvailable)
{
switch (Platform.CurrentPlatformId)
{
case Platform.Id.Linux:
if (Glx.IsAvailable == false)
{
Egl.IsRequired = true;
}
break;
}
}
#endif
// Create native window for getting preliminary information on desktop systems
// This instance will be used for creating contexts without explictly specify a window
_NativeWindow = DeviceContext.CreateHiddenWindow();
// Create device context
using (DeviceContext windowDevice = DeviceContext.Create()) {
// Create basic OpenGL context
IntPtr renderContext = windowDevice.CreateSimpleContext();
if (renderContext == IntPtr.Zero)
{
throw new NotImplementedException("unable to create a simple context");
}
// Make contect current
if (windowDevice.MakeCurrent(renderContext) == false)
{
throw new InvalidOperationException("unable to make current", windowDevice.GetPlatformException());
}
#if !MONODROID
// Reload platform function pointers, if required
if (Egl.IsRequired == false)
{
switch (Platform.CurrentPlatformId)
{
case Platform.Id.WindowsNT:
Wgl.BindAPI();
break;
}
}
#endif
// Query OpenGL informations
string glVersion = GetString(StringName.Version);
_CurrentVersion = KhronosVersion.Parse(glVersion);
// Query OpenGL extensions (current OpenGL implementation, CurrentCaps)
_CurrentExtensions = new Extensions();
_CurrentExtensions.Query();
// Query platform extensions
windowDevice.QueryPlatformExtensions();
// Query OpenGL limits
_CurrentLimits = Limits.Query(Gl.CurrentVersion, _CurrentExtensions);
// Obtain current OpenGL Shading Language version
string glslVersion = null;
switch (_CurrentVersion.Api)
{
case KhronosVersion.ApiGl:
if (_CurrentVersion >= Version_200 || _CurrentExtensions.ShadingLanguage100_ARB)
{
glslVersion = GetString(StringName.ShadingLanguageVersion);
}
break;
case KhronosVersion.ApiGles2:
glslVersion = GetString(StringName.ShadingLanguageVersion);
break;
}
if (glslVersion != null)
{
_CurrentShadingVersion = GlslVersion.Parse(glslVersion, _CurrentVersion.Api);
}
// Vendor/Render information
_Vendor = GetString(StringName.Vendor);
_Renderer = GetString(StringName.Renderer);
if (EnvDebug || EnvExperimental)
{
Debug.Assert(CurrentVersion != null && CurrentExtensions != null);
CheckExtensionCommands <Gl>(CurrentVersion, CurrentExtensions, EnvExperimental);
}
// Before deletion, make uncurrent
windowDevice.MakeCurrent(IntPtr.Zero);
// Detroy context
if (windowDevice.DeleteContext(renderContext) == false)
{
throw new InvalidOperationException("unable to delete OpenGL context");
}
}
LogComment("OpenGL.Net has been initialized");
} catch (Exception excepton) {
_InitializationException = excepton;
LogComment("Unable to initialize OpenGL.Net: {0}", _InitializationException.ToString());
}
}
/// <summary>
/// Initialize OpenGL namespace static environment. This method shall be called before any other classes methods.
/// </summary>
public static void Initialize()
{
if (_Initialized == true)
{
return; // Already initialized
}
_Initialized = true;
// Before linking procedures, append ANGLE directory in path
string assemblyPath = GetAssemblyLocation();
string anglePath = null;
switch (Platform.CurrentPlatformId)
{
case Platform.Id.WindowsNT:
if (assemblyPath != null)
{
#if DEBUG
if (IntPtr.Size == 8)
{
anglePath = Path.Combine(assemblyPath, @"ANGLE\winrt10d\x64");
}
else
{
anglePath = Path.Combine(assemblyPath, @"ANGLE\winrt10d\x86");
}
#else
if (IntPtr.Size == 8)
{
anglePath = Path.Combine(assemblyPath, @"ANGLE\winrt10\x64");
}
else
{
anglePath = Path.Combine(assemblyPath, @"ANGLE\winrt10\x86");
}
#endif
}
break;
case Platform.Id.Linux:
// Note: on RPi libEGL.so depends on libGLESv2.so, so it's required to pre-load the shared library
// Note: maybe a configurable and generic method for pre-loading assemblies may be introduced
GetProcAddressLinux.GetLibraryHandle("libGLESv2.so", false);
break;
}
// Include ANGLE path, if any
#if NETSTANDARD1_1
if (anglePath != String.Empty)
{
OpenGL.GetProcAddressOS.AddLibraryDirectory(Path.Combine(assemblyPath, anglePath));
}
#else
if (anglePath != null && Directory.Exists(anglePath))
{
OpenGL.GetProcAddressOS.AddLibraryDirectory(Path.Combine(assemblyPath, anglePath));
}
#endif
// Load procedures
BindAPI();
if (IsAvailable == false)
{
return;
}
#if DEBUG
string envEglInit = Environment.GetEnvironmentVariable("EGL_INIT");
if (envEglInit != null && envEglInit == "NO")
{
return;
}
#endif
// Platform initialization
EglEventArgs args = new EglEventArgs();
RaiseEglInitializing(args);
// Get EGL information
IntPtr eglDisplay = Egl.GetDisplay(args.Display);
try {
if (Initialize(eglDisplay, null, null) == false)
{
throw new InvalidOperationException("unable to initialize EGL");
}
// Query EGL version
string eglVersionString = QueryString(eglDisplay, VERSION);
_CurrentVersion = KhronosVersion.Parse(eglVersionString, KhronosVersion.ApiEgl);
// Query EGL vendor
_Vendor = QueryString(eglDisplay, VENDOR);
// Client APIs
List <string> clientApis = new List <string>();
if (_CurrentVersion >= Version_120)
{
string clientApisString = QueryString(eglDisplay, CLIENT_APIS);
string[] clientApiTokens = System.Text.RegularExpressions.Regex.Split(clientApisString, " ");
foreach (string api in DeviceContextEGL.ConvertApiNames(clientApiTokens))
{
clientApis.Add(api);
}
}
_AvailableApis = clientApis.ToArray();
// Null device context for querying extensions
using (DeviceContextEGL deviceContext = new DeviceContextEGL(args.Display, IntPtr.Zero)) {
_CurrentExtensions = new Extensions();
_CurrentExtensions.Query(deviceContext);
}
} finally {
Terminate(eglDisplay);
}
}
/// <summary>
/// Initialize OpenGL namespace static environment. This method shall be called before any other classes methods.
/// </summary>
public static void Initialize()
{
if (_Initialized == true)
{
return; // Already initialized
}
_Initialized = true;
// Before linking procedures, append ANGLE directory in path
string assemblyPath = Path.GetDirectoryName(Assembly.GetAssembly(typeof(Egl)).Location);
string anglePath = null;
switch (Platform.CurrentPlatformId)
{
case Platform.Id.WindowsNT:
#if DEBUG
if (IntPtr.Size == 8)
{
anglePath = Path.Combine(assemblyPath, @"ANGLE\winrt10d\x64");
}
else
{
anglePath = Path.Combine(assemblyPath, @"ANGLE\winrt10d\x86");
}
#else
if (IntPtr.Size == 8)
{
anglePath = Path.Combine(assemblyPath, @"ANGLE\winrt10\x64");
}
else
{
anglePath = Path.Combine(assemblyPath, @"ANGLE\winrt10\x86");
}
#endif
break;
case Platform.Id.Linux:
// Note: on RPi libEGL.so depends on libGLESv2.so, so it's required to pre-load the shared library
GetProcAddressX11.GetLibraryHandle("libGLESv2.so", false);
break;
}
// Include ANGLE path, if any
if (anglePath != null && Directory.Exists(anglePath))
{
OpenGL.GetProcAddress.GetProcAddressOS.AddLibraryDirectory(Path.Combine(assemblyPath, anglePath));
}
// Load procedures
string platformLibrary = GetPlatformLibrary();
try {
LogComment("Querying EGL from {0}", platformLibrary);
BindAPI <Egl>(platformLibrary, OpenGL.GetProcAddress.GetProcAddressOS);
LogComment("EGL availability: {0}", IsAvailable);
} catch (Exception exception) {
/* Fail-safe (it may fail due Egl access) */
LogComment("EGL not available:\n{0}", exception.ToString());
}
if (IsAvailable == false)
{
return;
}
#if DEBUG
string envEglInit = Environment.GetEnvironmentVariable("EGL_INIT");
if (envEglInit != null && envEglInit == "NO")
{
return;
}
#endif
// Platform initialization
EglEventArgs args = new EglEventArgs();
RaiseEglInitializing(args);
// Get EGL information
IntPtr eglDisplay = Egl.GetDisplay(args.Display);
try {
if (Initialize(eglDisplay, null, null) == false)
{
throw new InvalidOperationException("unable to initialize EGL");
}
// Query EGL version
string eglVersionString = QueryString(eglDisplay, VERSION);
_CurrentVersion = KhronosVersion.Parse(eglVersionString, KhronosVersion.ApiEgl);
// Query EGL vendor
_Vendor = QueryString(eglDisplay, VENDOR);
// Client APIs
if (_CurrentVersion >= Version_120)
{
string clientApisString = QueryString(eglDisplay, CLIENT_APIS);
_AvailableApis = System.Text.RegularExpressions.Regex.Split(clientApisString, " ");
}
} finally {
Terminate(eglDisplay);
}
}
/// <summary>
/// Initialize OpenGL namespace static environment. This method shall be called before any other classes methods.
/// </summary>
public static void Initialize()
{
if (_Initialized == true)
{
return; // Already initialized
}
_Initialized = true;
#if DEBUG
string envGlInit = Environment.GetEnvironmentVariable("GL_INIT");
if (envGlInit != null && envGlInit == "NO")
{
return;
}
#endif
LogComment("OpenGL.Net is initializing");
// Loader function OS API GL API
// ------------------------------------------------------
// Supported platform: Windows
// wglGetProcAddress WGL GL
// wglGetProcAddress WGL GLES2+ (with WGL_create_context_es(2)?_profile_EXT)
// eglGetProcAddress EGL(Angle) GLES2+
// ------------------------------------------------------
// Supported platform: Linux
// glXGetProcAddress GLX GL
// glXGetProcAddress GLX GLES2+ (with GLX_create_context_es(2)?_profile_EXT)
// ------------------------------------------------------
// Supported platform: Android
// eglGetProcAddress EGL GL
// eglGetProcAddress EGL GLES2+
try {
// Create native window for getting preliminary information on desktop systems
// This instance will be used for creating contexts without explictly specify a window
_NativeWindow = DeviceContext.CreateHiddenWindow();
// Create device context
using (DeviceContext windowDevice = DeviceContext.Create()) {
// Create basic OpenGL context
IntPtr renderContext = windowDevice.CreateSimpleContext();
if (renderContext == IntPtr.Zero)
{
throw new NotImplementedException("unable to create a simple context");
}
// Make contect current
if (windowDevice.MakeCurrent(renderContext) == false)
{
throw new InvalidOperationException("unable to make current", windowDevice.GetPlatformException());
}
// Query OpenGL informations
string glVersion = GetString(StringName.Version);
_CurrentVersion = KhronosVersion.Parse(glVersion);
// Obtain current OpenGL Shading Language version
switch (_CurrentVersion.Api)
{
case KhronosVersion.ApiGl:
case KhronosVersion.ApiGles2:
string glslVersion = GetString(StringName.ShadingLanguageVersion);
_CurrentShadingVersion = GlslVersion.Parse(glslVersion);
break;
}
// Vendor/Render information
_Vendor = GetString(StringName.Vendor);
_Renderer = GetString(StringName.Renderer);
// Query OpenGL extensions (current OpenGL implementation, CurrentCaps)
_CurrentExtensions = new Extensions();
_CurrentExtensions.Query();
// Query OpenGL limits
_CurrentLimits = Limits.Query(_CurrentExtensions);
// Query platform extensions
windowDevice.QueryPlatformExtensions();
// Before deletion, make uncurrent
windowDevice.MakeCurrent(IntPtr.Zero);
// Detroy context
if (windowDevice.DeleteContext(renderContext) == false)
{
throw new InvalidOperationException("unable to delete OpenGL context");
}
}
LogComment("OpenGL.Net has been initialized");
} catch (Exception excepton) {
LogComment("Unable to initialize OpenGL.Net: {0}", excepton.ToString());
}
}
/// <summary>
/// Static constructor.
/// </summary>
static Gl()
{
// Cache imports & delegates
_Delegates = GetDelegateList(typeof(Gl));
_ImportMap = GetImportMap(typeof(Gl));
// Load procedures (OpenGL desktop by default) @todo Really necessary?
LoadProcDelegates(_ImportMap, _Delegates);
// Create common hidden window
_HiddenWindow = new System.Windows.Forms.Form();
// Create device context
_HiddenWindowDevice = DeviceContextFactory.Create(_HiddenWindow);
_HiddenWindowDevice.IncRef();
// Create basic OpenGL context
IntPtr renderContext;
if (_HiddenWindowDevice is WindowsDeviceContext)
{
renderContext = CreateWinSimpleContext(_HiddenWindowDevice);
}
else if (_HiddenWindowDevice is XServerDeviceContext)
{
renderContext = CreateX11SimpleContext(_HiddenWindowDevice);
}
else if (_HiddenWindowDevice is NativeDeviceContext)
{
renderContext = CreateEglSimpleContext(_HiddenWindowDevice);
}
else
{
throw new NotImplementedException(String.Format("{0} is not a supported device context", _HiddenWindowDevice.GetType()));
}
// Query OpenGL informations
if (_HiddenWindowDevice.MakeCurrent(renderContext) == false)
{
throw new InvalidOperationException("unable to make current");
}
// Obtain current OpenGL implementation
string glVersion = Gl.GetString(StringName.Version);
_CurrentVersion = KhronosVersion.Parse(glVersion);
// Obtain current OpenGL Shading Language version
string glslVersion = Gl.GetString(StringName.ShadingLanguageVersion);
_CurrentShadingVersion = GlslVersion.Parse(glslVersion);
// Query OpenGL extensions (current OpenGL implementation, CurrentCaps)
_CurrentExtensions = new Extensions();
_CurrentExtensions.Query();
// Query OpenGL limits
_CurrentLimits = Limits.Query(_CurrentExtensions);
if (_HiddenWindowDevice is WindowsDeviceContext)
{
Wgl._CurrentExtensions = new Wgl.Extensions();
Wgl._CurrentExtensions.Query((WindowsDeviceContext)_HiddenWindowDevice);
}
else if (_HiddenWindowDevice is XServerDeviceContext)
{
Glx._CurrentExtensions = new Glx.Extensions();
Glx._CurrentExtensions.Query((XServerDeviceContext)_HiddenWindowDevice);
}
else if (_HiddenWindowDevice is NativeDeviceContext)
{
Egl._CurrentExtensions = new Egl.Extensions();
Egl._CurrentExtensions.Query((NativeDeviceContext)_HiddenWindowDevice);
}
// Before deletion, make uncurrent
_HiddenWindowDevice.MakeCurrent(IntPtr.Zero);
// Detroy context
if (_HiddenWindowDevice.DeleteContext(renderContext) == false)
{
throw new InvalidOperationException("unable to delete OpenGL context");
}
}