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This mostly replaces lots of QT_OPENGL_ES defines with QT_NO_EGL
instead. It also switches off EGL auto-detection by default. This is
to make sure we default to using GLX on systems with both EGL and
desktop OpenGL. If -opengl es1|es2 or -openvg is specified, then
EGL auto-detection is switched back on (as a requirement. If
configure auto-detects OpenGL ES it also switches on EGL
auto-detection, but failue then just disables both EGL & OpenGL.
As a side effect, this patch also fixes building Qt when both EGL
and glx are avaliable, as they are in Mesa >= 7.8.0.
Reviewed-by: Trond
Task-number: QTBUG-9691
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Qt used to store the GL extensions a particular implementation supported
in a global cache, which was initialized once and never updated.
This could cause problems because different types of context might
support different kinds of extensions (e.g. the difference between
sw and hw contexts). With this patch, the GL extensions are cached
and updated within each QGLContext. It also makes the extension
initialization lazy, which saves application initialization costs for
embedded platforms.
The patch introduces a internal cross platform QGLTemporaryContext
class that is used to create a light-weight GL context without going
via QGLWidget and friends (QWS and WinCE still have QGLWidget fallbacks
for now).
Reviewed-by: Kim
Reviewed-by: Samuel
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Reviewed-by: Trust Me
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Reviewed-by: Trust Me
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This patch also refactors QGL2PaintEngineEx::ensureActive() and the
logic which handles multiple paint engines rendering to the same
QGLContext. In a nut-shell:
* QGLPaintDevice::beginPaint() stores the currently bound FBO
* QGLPaintDevice::ensureActiveTarget() makes sure that GL rendering will
end up in the paint device (I.e. the right context is current and the
right FBO is bound). If a different context or FBO was bound, it is
_not_ remembered.
* QGLPaintDevice::endPaint() restores whatever FBO was bound when
beginPaint() was called.
This logic allows interleaved painter rendering to multiple FBOs and
contexts to work as expected. It also allows a stacked begin/end to work
properly when it's mixed with native GL rendering (as far as current
render target is concerened. GL state clobbering is obviously a
different topic).
QGLPaintDevice::context() also had to be made virtual as there's no good
place to call setContext. This might be possible to change in the future
though.
Finally, to make this work, QGLFramebufferObjectPrivate had to be moved
into it's own private header.
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Add a new QGLPBufferGLPaintDevice implementation which allows the GL
engines to target QGLPixelBuffers again.
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Reviewed-by: Trust Me
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Reviewed-by: Trust Me
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Reviewed-by: Trust Me
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