Angle Opengl Es 2.0 Emulation Libraries

[Henrietta Naughton]

Installa driver providing OpenGL 2.0 or higher, or, if this is not possible, make sure the ANGLE Open GL ES 2.0 emulation libraries (libraries (libEGL.dll, libGLESv2.dll andd3dcompiler_*dll) are available in the application executable's directory or in a location listed in PATH.

For context, I have just installed Windows on a new SSD and am trying to get the most recent graphics drivers installed for my FirePro W7100. I have installed these drivers before on my last hard drive with no issues, but now it's giving me this error: "Failed to create OpenGL context for format QSurfaceFormat.. This is most likely caused by not having the necessary graphics drivers installed. Install a driver providing OpenGL 2.0 or higher, or, if this is not possible, make sure the ANGLE Open GL ES 2.0 emulation libraries (libEGL.dll, libGLESv2.dll, and d3dcompiler_*.dll) are available in the application executable's directory or in a location listed in PATH." I haven't been able to find a solution. Any help on this? Thanks.

I am trying to experiment with the Qt library on Windows. On their downloads page, I notice that the binaries built using VS2012 are available in two forms, with and without OpenGL. What exactly is the difference between the two? In the OpenGL version, do they have some special API implemented using OpenGL or does all of Qt rendering depend on OpenGL? Also, is there a version of Qt that uses DirectX?

The non-opengl variant is using angle, and you need to have that installed alongside the DirectX SDK to get it working. Angle is an adapter between the directx and the opengles API. Only the latter is support directly by Qt, but unfortunately directx drivers tend to work better on Windows than the opengl(es) ones. There are no plans to support a directx backend inside Qt, so we leave with Google's Angle work in that regard.

As for providing some extra bit, there was a discussion about it recently on the mailing list, that this decision should not be build time, but more like run time. However, no one has stood up just yet to make that work. Hopefully, that will change soon. It is causing confusion for the end users just like, so do not feel alone. ;-)

Note that this has changed and as of Qt 5.5 the prebuilt binaries you can download from the Qt website are configured with the -opengl dynamic option. This is what @lpapp above was talking about. Qt defaults to choosing either native OpenGL drivers or ANGLE at run time now.

Bugle has partial support for OpenGL ES. The OpenGL ES 2.0 support has been tested using the AMD OpenGL ES Emulator 1.3, and both 1.1 and 2.0 support have been tested on an ARM Linux platform. OpenGL ES 1.0 support has not been tested and is probably broken. For OpenGL ES 1.x, only the Common (CM) profile is supported.

The testing shows that basic features work. These include tracing, and the debugger using breakpoints, examining state, and examining shaders. Texture and vertex buffer viewing does not currently work (due to limitations of the query mechanisms in OpenGL ES). Many of the filtersets do not work, either because they intrinsicly depend on features excluded from OpenGL ES, or because they have not yet been ported. The test suite is not supported.

It should be noted that when using an emulator that works on top of OpenGL, an alternative approach to debugging is to use bugle as a regular (desktop) OpenGL debugger. This will reveal data such as textures, VBOs and framebuffers. However, it cannot access the error checking that is done in the emulation layer. For example, an INVALID_ENUM error will not be caught by the debugger if it is generated entirely within the emulation layer.

The process for building is the same as described in Chapter 2, Installing Bugle. To indicate that OpenGL ES is desired, add either gltype=gles1cm or gltype=gles2 to the scons command line. There is no need to specify glwin, as it will automatically default to EGL.

You also need to ensure that your various paths are set correctly. The headers, libraries and DLLs for the OpenGL ES implementation need to be listed in CPATH, LIBRARY_PATH and PATH respectively, unless the compiler is already configured to find them.

Apart from the usual installation step, some extra setup is required on a Windows system when using OpenGL ES, due to the limitations of the dynamic linker. For OpenGL ES 2.0, create copies of the system libEGL.dll and libGLESv2.dll called bglEGL.dll and bglGLESv2.dll respectively. Then modify each of these files so that links to the other use the replacement name. This can be done as follows:

You should check that the new files are exactly the same size as the originals. Next, make sure that the versions of libEGL.dll and libGLESv2.dll installed by bugle are the first on the path, and that the renamed libraries you generated are also on the path.

Windows also has multiple function calling conventions, and different implementations of OpenGL ES (particularly for 1.x) make inconsistent choices. You can override the automatic choice by passing callapi=__stdcall or callapi=__cdecl to select the stdcall or cdecl calling convention. You should be able to determine the convention by examining GLES/glplatform.h or GLES2/gl2platform.h.

Behavior matches other platforms more closely. This reduces the size of a self-contained application package considerably.Letting Qt Core utilize the ICU libraries however has following advantages: ICUFrom Qt 5.3 and onwards, configure does not link Qt Core against ICU libraries anymore by default. See Secure Sockets Layer (SSL) Classes for instructions on building Qt with SSL support. ANGLE: This library converts OpenGL ES 2.0 API calls to DirectX 11 or DirectX 9 calls (depending on availability), removing the need to install graphics drivers on the target machines.Support for Secure Sockets Layer (SSL) communication is provided by the OpenSSL Toolkit, which must be obtained separately.

If MSVC is used, the DirectX SDK will be provided by the Windows SDK. ANGLE implements the OpenGL ES 2.0 API on top of DirectX 11 or DirectX 9.ANGLE requires that the DirectX SDK is installed when building Qt. Qt includes a version of the ANGLE project which is included from the Windows Qt installers. The default driver from Windows is OpenGL 1.1. QCollator::setNumericMode() does work consistently on all Windows versions.To explicitly enable the use of ICU in Qt Core, pass -icu to configure:For Qt Quick 2 to work, a graphics driver that provides OpenGL 2.1 or higher is required. QLocale::toUpper(), QLocale::toLower() always use case conversion rules specific to the locale.

For these cases, the environment variable QT_ANGLE_PLATFORM (introduced in Qt 5.4) can be used to control the render backend. However, some graphics cards may not fully support it. DirectX 11 is usually preferable. For MinGW builds, you have to install the DirectX SDK provided by Microsoft.ANGLE chooses the render backend depending on availability.

This fallback will be completely transparent to the application, and will allow Qt Quick or other OpenGL code to function by translating to Direct3D. When a given environment fails to provide a proper OpenGL 2.0 implementation, it will fall back automatically to ANGLE. It allows robust application deployment. It is strongly recommended to use it also in custom builds, especially for Qt binaries that are deployed alongside applications.Note: Combining -opengl dynamic with -static is also possible, but be aware that ANGLE will not be statically linked into the applications in this case, it will still be built as a shared library.This configuration is the most flexible because no dependencies or assumptions are hardcoded about the OpenGL implementation during build time. To use OpenGL, pass the command line options -opengl desktop to the configure script.Note: As of Qt 5.5 this is the configuration used by the official, pre-built binary packages of Qt.

By default, Qt will determine whether the system's opengl32.dll provides OpenGL 2 functions. Instead, the appropriate library is chosen at runtime. Additionally, pure software-based OpenGL implementations may be available as additional fallbacks in the future, allowing running Qt Quick applications without a GPU.When configured with -opengl dynamic, neither Qt nor the applications built using qmake will link to the opengl32 (standard desktop OpenGL) or QtANGLE libraries. On other machines, where there is sufficient OpenGL support, the normal desktop OpenGL drivers will be used.

Instead, applications are expected to use the OpenGL functions via the QOpenGLFunctions class. Qt::AA_UseSoftwareOpenGL Equivalent to setting QT_OPENGL to software.When a certain configuration is requested explicitly, no checks are done at application startup, that is, the system-provided opengl32.dll will not be examined.The dynamic loading has a significant impact on applications that contain native OpenGL calls: they may fail to link since qmake no longer automatically adds opengl32.lib or libGLESv2.lib. Qt::AA_UseOpenGLES Equivalent to setting QT_OPENGL to angle. Qt::AA_UseDesktopOpenGL Equivalent to setting QT_OPENGL to desktop. See below for details.The loading mechanism can be configured through the QT_OPENGL environment variable and the following application attributes: In case the ANGLE libraries are missing or initialization fails for some reason, an additional fallback is attempted by trying to load opengl32sw.dll.

The default name is opengl32sw.dll. The result is, from the application's perspective, equivalent to the -opengl desktop build configuration of Qt.Qt::AA_UseSoftwareOpenGL is special in the sense that it will try to load an OpenGL implementation with a non-standard name. Pro project files: LIBS += opengl32.lib (Visual Studio) or LIBS += -lopengl32 ( MinGW). Additionally, if they wish to, such applications are free to make direct OpenGL function calls by adding opengl32.lib to their. When these attributes are set, no other OpenGL implementations are considered.

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