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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\title Qt Quick Examples - Shader Effects
\example shadereffects
\image qml-shadereffects-example.png
\brief A Qt Quick example demonstrating the use of shader effects.
\ingroup qtquickexamples
\examplecategory {Graphics}
This example demonstrates a couple of visual effects that you can perform
with shaders in Qt Quick. It applies five different effects on a text and
a couple of images. For more information, visit
\l{Important Concepts In Qt Quick - Graphical Effects}
\include examples-run.qdocinc
\section1 Using ShaderEffect
The \l ShaderEffect type typically operates on other types, using a
\l ShaderEffectSource:
\snippet shadereffects/shadereffects.qml source
In the above snippet, \c theItem is the ID of a complex QML object in the
file.
ShaderEffects can use this ShaderEffectSource as a texture in their fragment
shader:
\snippet shadereffects/shadereffects.qml fragment
In order to support multiple graphics APIs, not just OpenGL, the
shader source is not embedded into QML. The referenced \c{.qsb}
file is a pre-generated shader pack containing multiple variants
of the shader code. The appropriate shader is then chosen by Qt
Quick at run time, depending on the graphics API (Vulkan, Metal,
Direct3D 11, or OpenGL) used at run time. The .qsb file is
generated offline and is bundled with the executable via the Qt
Resource System.
You can use any custom property on the ShaderEffect in your shader. This
makes animated shader code very easy:
\snippet shadereffects/shadereffects.qml properties
ShaderEffects can also have a custom vertext shader. Setting the mesh
property on ShaderEffect provides more vertices for you to manipulate,
enabling more effects.
\snippet shadereffects/shadereffects.qml vertex
*/
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