e2ad97eef9
Fixes: QTBUG-117884 Pick-to: 6.6 Change-Id: I33c7b1cbfaeae866dffb0e89a5d09d775736d886 Reviewed-by: Topi Reiniö <topi.reinio@qt.io> (cherry picked from commit 98ee4d9e37a1038d46f0c0494332c0ed46dbb323) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
47 lines
1.9 KiB
Plaintext
47 lines
1.9 KiB
Plaintext
// Copyright (C) 2022 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
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/*!
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\example stereoqopenglwidget
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\title QOpenGLWidget Stereoscopic Rendering Example
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\examplecategory {Graphics}
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\ingroup examples-widgets-opengl
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\brief This example shows how to create a minimal QOpenGLWidget based
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application with stereoscopic rendering support.
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\note Support for stereoscopic rendering has certain hardware requirements,
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such as, a graphics card with stereo support, 3D glasses and specific
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monitors.
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\note This example renders two images to two separate buffers. When you
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view the images through 3D glasses, they give a 3D holographic effect.
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\image stereoexample-leftbuffer.png
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The above image is what will be rendered to the left buffer.
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\image stereoexample-rightbuffer.png
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The above image is what will be rendered to the right buffer.
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\section1 Setting the correct surface flag
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To enable stereoscopic rendering you need to set the flag
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QSurfaceFormat::StereoBuffers globally. Just doing it on the widget is not enough
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because of how the flag is handled internally. The safest is to do it on
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QSurfaceFormat::SetDefaultFormat prior to starting the application.
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\snippet stereoqopenglwidget/main.cpp 1
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\section1 Rendering twice
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After QSurfaceFormat::StereoBuffers is set, then paintGL() will be called twice,
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once for each buffer. In paintGL() you can call currentTargetBuffer() to query
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which TargetBuffer is currently active.
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In the following snippet we slightly translate the matrix to not render the
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vertices on top of each other. This is a simple example just too see that if the
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necessary support is there, at runtime you should see two objects, one on the left
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and one on the right.
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\snippet stereoqopenglwidget/glwidget.cpp 1
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*/
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