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ui/egl-helpers: fix egl 1.5 display init

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Unfortunaly switching to getPlatformDisplayEXT isn't as easy as
implemented by 0ea1523fb6.  See the
longish comment for the complete story.

Cc: Frediano Ziglio <fziglio@redhat.com>
Suggested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1489997042-1824-1-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2017-03-20 09:04:02 +01:00
parent db6cd4c855
commit 8bce03e393
1 changed files with 52 additions and 6 deletions
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58
ui/egl-helpers.c
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@ -192,6 +192,56 @@ EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, Window win)
/* ---------------------------------------------------------------------- */
/*
* Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
*
* Create an EGLDisplay from a native display type. This is a little quirky
* for a few reasons.
*
* 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
* use, but have different function signatures in the third argument; this
* happens not to matter for us, at the moment, but it means epoxy won't alias
* them together.
*
* 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
* means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
* will crash.
*
* 3: You can't tell whether you have EGL 1.5 at this point, because
* eglQueryString(EGL_VERSION) is a property of the display, which we don't
* have yet. So you have to query for extensions no matter what. Fortunately
* epoxy_has_egl_extension _does_ let you query for client extensions, so
* we don't have to write our own extension string parsing.
*
* 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
* needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
* function pointer.
* We can workaround this (circular dependency) by probing for the EGL 1.5
* platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
* like mesa will be able to advertise these (even though it can do EGL 1.5).
*/
static EGLDisplay qemu_egl_get_display(void *native)
{
EGLDisplay dpy = EGL_NO_DISPLAY;
#ifdef EGL_MESA_platform_gbm
/* In practise any EGL 1.5 implementation would support the EXT extension */
if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
(void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
if (getPlatformDisplayEXT) {
dpy = getPlatformDisplayEXT(EGL_PLATFORM_GBM_MESA, native, NULL);
}
}
#endif
if (dpy == EGL_NO_DISPLAY) {
/* fallback */
dpy = eglGetDisplay(native);
}
return dpy;
}
int qemu_egl_init_dpy(EGLNativeDisplayType dpy, bool gles, bool debug)
{
static const EGLint conf_att_gl[] = {
@ -222,12 +272,8 @@ int qemu_egl_init_dpy(EGLNativeDisplayType dpy, bool gles, bool debug)
setenv("LIBGL_DEBUG", "verbose", true);
}
egl_dbg("eglGetDisplay (dpy %p) ...\n", dpy);
#ifdef EGL_MESA_platform_gbm
qemu_egl_display = eglGetPlatformDisplayEXT(EGL_PLATFORM_GBM_MESA, dpy, NULL);
#else
qemu_egl_display = eglGetDisplay(dpy);
#endif
egl_dbg("qemu_egl_get_display (dpy %p) ...\n", dpy);
qemu_egl_display = qemu_egl_get_display(dpy);
if (qemu_egl_display == EGL_NO_DISPLAY) {
error_report("egl: eglGetDisplay failed");
return -1;