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The expectation for it is to function identically to what we get with
QOpenGLShaderProgram. (same environment variables, same logging
categories, etc.).
QOpenGLProgramBinaryCache is now shared between the QOpenGL convenience
classes (like QOpenGLShaderProgram) and QRhi. To achieve more modularity
and to prepare for QOpenGLShaderProgram and friends moving out of QtGui,
this class cannot depend on QOpenGLShader* anymore. This involves adding
some minor conversions between QRhi and QOpenGL enums for example.
Change-Id: I2f4664e074823ea536281aea8006a6db159a7381
Reviewed-by: Christian Strømme <christian.stromme@qt.io>
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This class will likely be used by the OpenGL backend of QRhi as well.
Therefore, we need to make it more self-contained and independent.
Change-Id: If046ed41e25c70cc9abb45219b451f9179feaa1c
Reviewed-by: Christian Strømme <christian.stromme@qt.io>
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While there is likely no example of it in Qt itself, applications can
use QOpenGLShaderProgram instances on different threads. These instances
have nothing to do with each other but they do share a global cache object.
This becomes problematic without proper synchronization.
Change-Id: I80faf73f34af7e67349eee916bb3f216e22c07fd
Fixes: QTBUG-77469
Reviewed-by: Christian Strømme <christian.stromme@qt.io>
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Change-Id: I4fb71471a7dd22441def1eb837857d245c3e3c5a
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
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Fix
QtGui: WARNING: qtbase/src/gui/opengl/qopenglprogrambinarycache_p.h does not have the "We mean it." warning
Amends change 85f868e73e4cf9dffe27b737f8dc3f5bb626ed04.
Change-Id: Id2e8c3e7ac4fa732c0a3d99faab91f08121fba96
Task-number: QTBUG-55496
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
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Introduce a glProgramBinary-based disk cache in QOpenGLShaderProgram.
By switching the typical
program->addShaderFromSourceCode(QOpenGLShader::Vertex, ...)
program->addShaderFromSourceCode(QOpenGLShader::Fragment, ...)
invocations to
program->addCacheableShaderFromSourceCode(QOpenGLShader::Vertex, ...)
program->addCacheableShaderFromSourceCode(QOpenGLShader::Fragment, ...)
the compilation may be skipped via gl(Get)ProgramBinary and a disk
cache, when supported. Such QOpenGLShaderProgram instances will have
no QOpenGLShader instances attached. Instead, the entire program
binary (which is driver-specific) is loaded as-is.
Support means OpenGL ES 3.0 or the presence of
GL_ARB_get_program_binary, in combination with >= 1 supported binary
formats. Note that some drivers claim program binary support but
expose no formats. This amounts to no support in practice.
When support is not present, calling the new functions is equivalent
to the non-cacheable variants. If the OpenGL driver changes (vendor,
renderer, version strings), recompilation and storage of the new,
potentially incompatible binary program will happen transparently.
The cache can always be disabled by setting
QT_DISABLE_SHADER_DISK_CACHE=1 or the new application attribute
Qt::AA_DisableShaderDiskCache.
Location-wise the primary choice is the shared cache
(GenericCacheLocation). If this is not available or is not writable,
the per-process one (CacheLocation) is used instead.
In addition to the new public APIs in QOpenGLShaderProgram, the main
shader users in QtGui are migrated as well. (OpenGL paint engine,
glyph cache, blitter, eglfs mouse cursor). This means that any
application using QPainter on OpenGL or widgets with eglfs will
benefit from the improved startup times. Qt Quick will follow suit as
well.
[ChangeLog][QtGui][OpenGL] QOpenGLShaderProgram offers a built-in
program binary disk cache for systems with OpenGL ES 3.x or
GL_ARB_get_program_binary. This can lead to significant increases in
performance when it comes to application startup times for
example. Usage is opt-in for direct C++ users of the class, however
Qt's own main users of shaders, including Qt Quick and QPainter's
OpenGL engine, are migrated to use the new, cache-enabled APIs.
Opting out on application level is always possible via
Qt::AA_DisableShaderDiskCache.
Task-number: QTBUG-55496
Change-Id: I556f053d258bfa6887b1d5238c9f6396914c5421
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
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