From fa091640134b3ff99a9eb92df8286d15203122bf Mon Sep 17 00:00:00 2001 From: Antonio Larrosa Date: Fri, 16 Feb 2018 13:18:42 +0100 Subject: opengl: Bail if cached shader fails to load 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. Done-with: Max Staudt Done-with: Michal Srb Done-with: Fabian Vogt Task-number: QTBUG-66420 Change-Id: Iabb51d0eb2c0c16bde696efff623e57d15f28d82 Reviewed-by: Jesus Fernandez Reviewed-by: Laszlo Agocs --- src/gui/opengl/qopenglprogrambinarycache.cpp | 20 ++++++++++++++++++-- src/gui/opengl/qopenglshaderprogram.cpp | 8 +------- 2 files changed, 19 insertions(+), 9 deletions(-) diff --git a/src/gui/opengl/qopenglprogrambinarycache.cpp b/src/gui/opengl/qopenglprogrambinarycache.cpp index 06373e1113..d16173df83 100644 --- a/src/gui/opengl/qopenglprogrambinarycache.cpp +++ b/src/gui/opengl/qopenglprogrambinarycache.cpp @@ -161,10 +161,26 @@ 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(); + + GLenum err = funcs->glGetError(); + if (err != GL_NO_ERROR) { + qCDebug(DBG_SHADER_CACHE, "Program binary failed to load for program %u, size %d, " + "format 0x%x, err = 0x%x", + programId, blobSize, blobFormat, err); + return false; + } + GLint linkStatus = 0; + funcs->glGetProgramiv(programId, GL_LINK_STATUS, &linkStatus); + if (linkStatus != GL_TRUE) { + qCDebug(DBG_SHADER_CACHE, "Program binary failed to load for program %u, size %d, " + "format 0x%x, linkStatus = 0x%x, err = 0x%x", + programId, blobSize, blobFormat, linkStatus, 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 b044397f8e..1fe30f7e0e 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; -- cgit v1.2.3