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Mimic the letterbox behaviour of the Qt viewfinder by rendering the
image centered. This is done by adding a projection matrix to the vertex
shader to scale the rendered rectangle.
Another option would have been to keep using glViewport() (which would
have needed to be moved to paintGL(), as Qt resets the viewport to span
the full widget before calling). Hidpi displays would then need special
handling of the device pixel ratio, which is done automatically by Qt
when it sets the default viewport. Using a projection matrix avoids this
complication.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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There's no need to call glClearColor() twice before drawing any GL
content. Drop the first call. This doesn't introduce any functional
change.
While at it, pass floats instead of doubles to glClearColor(), as
required by the function.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Starting in Qt 6.7.0, vertex buffers and shader programs are unbound
just before calling QOpenGLWidget::paintGL(). This breaks rendering in
the GL viewfinder in two ways.
First, we bind the vertex buffer only once at initialization time. There
is therefore no vertex buffer mapped at rendering time, preventing both
the vertex shader from having access to the vertex and texture
coordinates.
Then, we bind the shader program only when rendering the first frame.
There is thus no shader program bound for all subsequent frames,
breaking rendering.
Fix this by binding the vertex buffer where needed, when setting
attribute buffers for the shader program, and binding the shader program
for every frame.
As we use a single vertex buffer, we could bind it at the beginning of
paintGL() and keep it bound indefinitely. That would however fail to
clearly indicate in the source code where the vertex buffer is needed,
making the code more difficult to understand as it would rely on
implicit assumptions. Release the vertex buffer explicitly when we don't
need it anymore to avoid this.
While at it, fix a coding style violation by adding missing curly
brackets.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Source files in libcamera start by a comment block header, which
includes the file name and a one-line description of the file contents.
While the latter is useful to get a quick overview of the file contents
at a glance, the former is mostly a source of inconvenience. The name in
the comments can easily get out of sync with the file name when files
are renamed, and copy & paste during development have often lead to
incorrect names being used to start with.
Readers of the source code are expected to know which file they're
looking it. Drop the file name from the header comment blocks in all
remaining locations that were not caught by the automated script as they
are out of sync with the file name.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
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Multiple source files in the src/apps/cam/ directory are used by cam,
qcam and lc-compliance. They are compiled separately for each
application. Move them to a new src/apps/common/ directory and compile
them in a static library to decrease the number of compilation
operations.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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The cam and qcam test application share code, currently through a crude
hack that references the cam source files directly from the qcam
meson.build file. To prepare for the introduction of hosting that code
in a static library, move all applications to src/apps/.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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