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missed adding patch from prior commit

This commit is contained in:
Rex Dieter 2018-02-21 09:20:05 -06:00
parent 6dda2b9da8
commit 17fe6a9d45
1 changed files with 79 additions and 0 deletions
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opengl-Bail-if-cached-shader-fails-to-load.patch Normal file
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@ -0,0 +1,79 @@
From 3bb3ee936f27e9749bf1a2c4bd5ded2f5167663f Mon Sep 17 00:00:00 2001
From: Max Staudt <mstaudt@suse.de>
Date: Mon, 12 Feb 2018 15:07:29 +0100
Subject: [PATCH] opengl: Bail if cached shader fails to load
References: boo#1080578, boo#1079465
Signed-off-by: Max Staudt <mstaudt@suse.de>
QOpenGLProgramBinaryCache::setProgramBinary() should check
GL_LINK_STATUS after glProgramBinary(), but doesn't.
In practice, this means that SDDM is a white screen, and KDE is just
a gray task bar.
So far, Qt tries to check this using its internal ::link() function.
But in case the cached binary fails to load, Qt currently attempts to
link the inexistent program, resulting in a zero-length, fixed
pipeline shader.
Checking this already in ::setProgramBinary() makes the call to
::link() superfluous, so we remove that as well.
Many thanks to Michal Srb and Fabian Vogt for hunting this down.
This was truly a joint effort.
Cc: Michal Srb <msrb@suse.com>
Cc: Fabian Vogt <fvogt@suse.de>
Signed-off-by: Max Staudt <mstaudt@suse.de>
---
src/gui/opengl/qopenglprogrambinarycache.cpp | 11 ++++++++++-
src/gui/opengl/qopenglshaderprogram.cpp | 8 +-------
2 files changed, 11 insertions(+), 8 deletions(-)
diff --git a/src/gui/opengl/qopenglprogrambinarycache.cpp b/src/gui/opengl/qopenglprogrambinarycache.cpp
index 06373e1113..f50878ab5c 100644
--- a/src/gui/opengl/qopenglprogrambinarycache.cpp
+++ b/src/gui/opengl/qopenglprogrambinarycache.cpp
@@ -161,10 +161,19 @@ bool QOpenGLProgramBinaryCache::setProgramBinary(uint programId, uint blobFormat
QOpenGLExtraFunctions *funcs = QOpenGLContext::currentContext()->extraFunctions();
while (funcs->glGetError() != GL_NO_ERROR) { }
funcs->glProgramBinary(programId, blobFormat, p, blobSize);
+
int err = funcs->glGetError();
+ GLint link_status = 0;
+ funcs->glGetProgramiv(programId, GL_LINK_STATUS, &link_status);
+ if (link_status != GL_TRUE || err != GL_NO_ERROR) {
+ qCDebug(DBG_SHADER_CACHE, "Program binary failed to load for program %u, size %d, format 0x%x, link_status = 0x%x, err = 0x%x",
+ programId, blobSize, blobFormat, link_status, err);
+ return false;
+ }
+
qCDebug(DBG_SHADER_CACHE, "Program binary set for program %u, size %d, format 0x%x, err = 0x%x",
programId, blobSize, blobFormat, err);
- return err == 0;
+ return true;
}
#ifdef Q_OS_UNIX
diff --git a/src/gui/opengl/qopenglshaderprogram.cpp b/src/gui/opengl/qopenglshaderprogram.cpp
index cc8af16bfe..3b82baccb3 100644
--- a/src/gui/opengl/qopenglshaderprogram.cpp
+++ b/src/gui/opengl/qopenglshaderprogram.cpp
@@ -3824,13 +3824,7 @@ bool QOpenGLShaderProgramPrivate::linkBinary()
bool needsCompile = true;
if (binCache.load(cacheKey, q->programId())) {
qCDebug(DBG_SHADER_CACHE, "Program binary received from cache");
- linkBinaryRecursion = true;
- bool ok = q->link();
- linkBinaryRecursion = false;
- if (ok)
- needsCompile = false;
- else
- qCDebug(DBG_SHADER_CACHE, "Link failed after glProgramBinary");
+ needsCompile = false;
}
bool needsSave = false;
--
2.13.6