forked from AuroraMiddleware/gtk
af66faf604
This is for adding a EGL-based renderer which is done via the ANGLE project, which translate EGL calls to Direct3D 9/11. This is done as a possible solution to issue #105, especially for cases where the needed full GL extensions to map OpenGL to Direc3D is unavailable or unreliable, or when the OpenGL implementation from the graphics drivers are problematic. To enable this, do the following: -Build ANGLE and ensure the ANGLE libEGL.dll and libGLESv2.dll are available. A sufficiently-recent ANGLE is needed for things to work correctly--note that the copy of ANGLE that is included in qtbase-5.10.1 is sufficient. ANGLE is licensed under a BSD 3-clause license. Note also that Visual Studio 2013 or later is required to build ANGLE from QT-5.10.1, but the 2013-built ANGLE DLLs can work without without problems for GTK+ that is built with Visual Studio 2008 or later. -Build libepoxy on Windows with EGL support enabled. -Define GDK_WIN32_ENABLE_EGL when building gdk-win32.lib when building with Visual Studio, or pass in --enable-win32-gles during configure when building with MinGW/mingw-w64. -Prior to running GTK+ programs, the GDK_GL envvar needs to contain gles. Known issues: -Only OpenGL ES 3 is supported, ANGLE's ES 2 does not support the needed extensions, notably GL_OES_vertex_array_object, but its ES 3 support is sufficient. -There is no autodetection or fallback mechanism to enable using EGL/Angle automatically yet. There is no plans to do this in this commit. Thanks to LRN for pointing out that we should #include "win32/gdkwin32.h" instead of #include "gdkwin32.h" for gdkgl.c. LRN also did the autotools portion of this patch. Further notes about the autotools --enable-win32-gles option, fom LRN: This adds --enable-win32-gles option, which enables the code for GLES renderer. This commit also adds tests for WGL and EGL in epoxy. The absence of WGL is highly unlikely (it's enabled by default), but checking for EGL when GLES is enabled is necessary, as EGL is disabled in Windows builds of epoxy by default. |
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| win32 | ||
| Makefile-newvs.am | ||
| Makefile.am | ||
| Makefile.msvc-introspection | ||
| Makefile.msvcproj | ||