QOpenGLShaderProgram: glProgramBinary() resulting in LINK_STATUS=FALSE not handled properly (QTBUG-66420)
pull in opensuse patch for now
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From 3bb3ee936f27e9749bf1a2c4bd5ded2f5167663f Mon Sep 17 00:00:00 2001
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From: Max Staudt <mstaudt@suse.de>
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Date: Mon, 12 Feb 2018 15:07:29 +0100
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Subject: [PATCH] opengl: Bail if cached shader fails to load
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References: boo#1080578, boo#1079465
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Signed-off-by: Max Staudt <mstaudt@suse.de>
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QOpenGLProgramBinaryCache::setProgramBinary() should check
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GL_LINK_STATUS after glProgramBinary(), but doesn't.
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In practice, this means that SDDM is a white screen, and KDE is just
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a gray task bar.
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So far, Qt tries to check this using its internal ::link() function.
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But in case the cached binary fails to load, Qt currently attempts to
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link the inexistent program, resulting in a zero-length, fixed
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pipeline shader.
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Checking this already in ::setProgramBinary() makes the call to
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::link() superfluous, so we remove that as well.
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Many thanks to Michal Srb and Fabian Vogt for hunting this down.
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This was truly a joint effort.
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Cc: Michal Srb <msrb@suse.com>
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Cc: Fabian Vogt <fvogt@suse.de>
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Signed-off-by: Max Staudt <mstaudt@suse.de>
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---
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src/gui/opengl/qopenglprogrambinarycache.cpp | 11 ++++++++++-
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src/gui/opengl/qopenglshaderprogram.cpp | 8 +-------
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2 files changed, 11 insertions(+), 8 deletions(-)
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diff --git a/src/gui/opengl/qopenglprogrambinarycache.cpp b/src/gui/opengl/qopenglprogrambinarycache.cpp
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index 06373e1113..f50878ab5c 100644
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--- a/src/gui/opengl/qopenglprogrambinarycache.cpp
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+++ b/src/gui/opengl/qopenglprogrambinarycache.cpp
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@@ -161,10 +161,19 @@ bool QOpenGLProgramBinaryCache::setProgramBinary(uint programId, uint blobFormat
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QOpenGLExtraFunctions *funcs = QOpenGLContext::currentContext()->extraFunctions();
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while (funcs->glGetError() != GL_NO_ERROR) { }
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funcs->glProgramBinary(programId, blobFormat, p, blobSize);
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+
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int err = funcs->glGetError();
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+ GLint link_status = 0;
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+ funcs->glGetProgramiv(programId, GL_LINK_STATUS, &link_status);
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+ if (link_status != GL_TRUE || err != GL_NO_ERROR) {
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+ qCDebug(DBG_SHADER_CACHE, "Program binary failed to load for program %u, size %d, format 0x%x, link_status = 0x%x, err = 0x%x",
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+ programId, blobSize, blobFormat, link_status, err);
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+ return false;
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+ }
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+
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qCDebug(DBG_SHADER_CACHE, "Program binary set for program %u, size %d, format 0x%x, err = 0x%x",
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programId, blobSize, blobFormat, err);
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- return err == 0;
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+ return true;
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}
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#ifdef Q_OS_UNIX
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diff --git a/src/gui/opengl/qopenglshaderprogram.cpp b/src/gui/opengl/qopenglshaderprogram.cpp
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index cc8af16bfe..3b82baccb3 100644
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--- a/src/gui/opengl/qopenglshaderprogram.cpp
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+++ b/src/gui/opengl/qopenglshaderprogram.cpp
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@@ -3824,13 +3824,7 @@ bool QOpenGLShaderProgramPrivate::linkBinary()
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bool needsCompile = true;
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if (binCache.load(cacheKey, q->programId())) {
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qCDebug(DBG_SHADER_CACHE, "Program binary received from cache");
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- linkBinaryRecursion = true;
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- bool ok = q->link();
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- linkBinaryRecursion = false;
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- if (ok)
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- needsCompile = false;
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- else
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- qCDebug(DBG_SHADER_CACHE, "Link failed after glProgramBinary");
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+ needsCompile = false;
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}
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bool needsSave = false;
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--
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2.13.6
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@ -51,7 +51,7 @@ BuildRequires: pkgconfig(libsystemd)
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Name: qt5-qtbase
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Summary: Qt5 - QtBase components
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Version: 5.10.1
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Release: 4%{?dist}
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Release: 5%{?dist}
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# See LGPL_EXCEPTIONS.txt, for exception details
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License: LGPLv2 with exceptions or GPLv3 with exceptions
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@ -109,6 +109,9 @@ Patch53: qtbase-fdo101667.patch
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# respect QMAKE_LFLAGS_RELEASE when building qmake
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Patch54: qtbase-qmake_LFLAGS.patch
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# https://bugreports.qt.io/browse/QTBUG-66420
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Patch55: https://bugreports.qt.io/secure/attachment/69873/opengl-Bail-if-cached-shader-fails-to-load.patch
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# drop -O3 and make -O2 by default
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Patch61: qt5-qtbase-cxxflag.patch
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@ -361,6 +364,7 @@ Qt5 libraries used for drawing widgets and OpenGL items.
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%patch52 -p1 -b .moc_macros
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%patch53 -p1 -b .fdo101667
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%patch54 -p1 -b .qmake_LFLAGS
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%patch55 -p1 -b .QTBUG-66420
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%patch61 -p1 -b .qt5-qtbase-cxxflag
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%patch64 -p1 -b .firebird
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%if 0%{?fedora} > 27
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@ -989,6 +993,9 @@ fi
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%changelog
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* Wed Feb 21 2018 Rex Dieter <rdieter@fedoraproject.org> - 5.10.1-5
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- QOpenGLShaderProgram: glProgramBinary() resulting in LINK_STATUS=FALSE not handled properly (QTBUG-66420)
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* Fri Feb 16 2018 Rex Dieter <rdieter@fedoraproject.org> - 5.10.1-4
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- use %%make_build, %%ldconfig
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- drop %%_licensedir hack
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