From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35583) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1csWGK-0007tR-PP for qemu-devel@nongnu.org; Mon, 27 Mar 2017 11:08:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1csWGH-0000Az-KW for qemu-devel@nongnu.org; Mon, 27 Mar 2017 11:08:52 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48023) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1csWGH-0000AH-C0 for qemu-devel@nongnu.org; Mon, 27 Mar 2017 11:08:49 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 050E375EAB for ; Mon, 27 Mar 2017 15:08:48 +0000 (UTC) From: Gerd Hoffmann Date: Mon, 27 Mar 2017 15:28:36 +0200 Message-Id: <1490621317-25483-5-git-send-email-kraxel@redhat.com> In-Reply-To: <1490621317-25483-1-git-send-email-kraxel@redhat.com> References: <1490621317-25483-1-git-send-email-kraxel@redhat.com> Subject: [Qemu-devel] [PULL for-2.9 4/5] ui/egl-helpers: fix egl 1.5 display init List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Gerd Hoffmann , Frediano Ziglio Unfortunaly switching to getPlatformDisplayEXT isn't as easy as implemented by 0ea1523fb6703aa0dcd65e66b59e96fec028e60a. See the longish comment for the complete story. Cc: Frediano Ziglio Suggested-by: Hans de Goede Signed-off-by: Gerd Hoffmann Message-id: 1489997042-1824-1-git-send-email-kraxel@redhat.com --- ui/egl-helpers.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 52 insertions(+), 6 deletions(-) diff --git a/ui/egl-helpers.c b/ui/egl-helpers.c index 584dd1b..b7b6b2e 100644 --- a/ui/egl-helpers.c +++ b/ui/egl-helpers.c @@ -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; -- 1.8.3.1