Remove ANGLE

This marks the end of EGL and OpenGL ES support on Windows.

The concepts of -opengl dynamic, -opengl desktop, QT_OPENGL=software,
etc. remain unchanged, with the exception of the disapperance of
everything ANGLE related.

CMake builds now work identically to qmake on Windows: they default to
'dynamic' OpenGL on Windows, unless -DINPUT_opengl=desktop is specified.

On Windows, Qt 6 is expected to default to the "dynamic" OpenGL model by
default, just like Qt 5.15. This can be changed by switching to "desktop"
OpenGL, which will link to opengl32 (publicly, so other libs and applications
will do so as well) and disallows using another OpenGL DLL.

The "dynamic" mode is essential still because the fallback to a software
rasterizer, such as the opengl32sw.dll we ship with the Qt packages,
has to to work exactly like in Qt 5, the removal of ANGLE does not
change this concept in any way (except of course that the middle option
of using ANGLE is now gone)

When it comes to the windows plugin's OpenGL blacklist feature, it works
like before and accepts the ANGLE/D3D related keywords. They will
then be ignored. Similarly, requesting QT_OPENGL=angle is ignored (but
will show a warning).

The D3D11 and DXGI configure time tests are removed: Qt 5.14 already
depends on D3D 11.1 and DXGI 1.3 headers being available unconditionally
on Win32 (in QRhi's D3D11 backend). No need to test for these.

[ChangeLog][Windows] ANGLE is no longer included with Qt. Dynamic OpenGL
builds work like before but ANGLE is no longer an option. OpenGL proper
or an alternative opengl32 implementation are the two remaining options
now. Attempting to set QT_OPENGL=angle or Qt::AA_UseOpenGLES will have
no effect on Windows.

Fixes: QTBUG-79103
Change-Id: Ia404e0d07f3fe191b27434d863c81180112ecb3b
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

1 files changed, 0 insertions, 43 deletions

diff --git a/src/angle/README.qt b/src/angle/README.qt
deleted file mode 100644
index 2d484a0280..0000000000
--- a/src/angle/README.qt
+++ /dev/null
@@ -1,43 +0,0 @@
-This is the ANGLE project from:
-
-https://chromium.googlesource.com/angle/angle/+/master/README.md
-
-The upstream version used here can be found in:
-
-src/common/version.h
-
-This copy of the library has been modified with several patches
-that can be found in the 'patches' subdirectory.
-
-Updating ANGLE
--------------------------------------------------------------
-To update to a newer version of ANGLE, extract the archive
-directly into the 'src/3rdparty/angle' directory. ANGLE contains
-a .gitignore file that will overwrite the one in Qt, but this is
-not desirable so the ANGLE one should be discarded and the one in
-Qt should be kept. If there are new source/header files in ANGLE
-(git status -u) then they should be added to the relevant .pro
-file before committing.
-
-The patches in src/angle/patches should be applied on top.
-
-ANGLE ships with .def files for exporting functions in
-3rdparty/angle/src/libEGL/libEGL.def and
-3rdparty/angle/src/libGLESv2/libGLESv2.def.
-Since we build debug and release versions
-(libbEGL.dll/libEGLd.dll, respectively), debug versions of
-the .def files (libEGLd.def) must be created as copies
-with the LIBRARY name entry adapted.
-
-MinGW-w64 32-bit requires function exports in the .def files
-to be decorated. Modified versions of the .def files are created as
-<library>_mingw32.def. The decorated names of each function can be found
-using the nm command to list the symbols in libEGL.o and libGLESv2.o.
-
-Using a custom ANGLE
--------------------------------------------------------------
-Qt supports building a version of ANGLE other than the one that
-is contained in the source tree. To get Qt to build a different
-copy of ANGLE, you can set the ANGLE_DIR environment variable
-to point to the location of the custom ANGLE before building Qt.
-