// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only

/*!
    \example simplecustommaterial
    \title Qt 3D: Simple Custom Material QML Example
    \examplecategory {Data Visualization & 3D}
    \ingroup qt3d-examples-qml
    \brief Demonstrates creating a custom material in Qt 3D.

    \image simple-custom-material.jpg

    \e This example demonstrates creating a simple custom material.

    \include examples-run.qdocinc

    \section1 Specifying the Scene

    The example uses \l Scene3D to render a scene which will use the custom material.
    The scene contains a plane model, which uses the custom material.

    \quotefromfile simplecustommaterial/PlaneModel.qml
    \skipto Entity
    \printto

    \section1 Specifying the Material

    The material is specified in \c {simplecustommaterial/SimpleMaterial.qml}
    using \l Material type. First the material specifies parameters,
    which are mapped to the corresponding uniforms in the shaders so that they can be
    changed from the qml.

    \snippet simplecustommaterial/SimpleMaterial.qml 0

    Next we specify which shaders are loaded. Separate versions of the shaders are provided
    for OpenGL ES 2 and OpenGL renderers.

    \snippet simplecustommaterial/SimpleMaterial.qml 1

    In the vertex shader we simply transform the position by the transformation matrices.

    \quotefromfile simplecustommaterial/shaders/gl3/simpleColor.vert
    \skipto void main()
    \printto

    In the fragment shader we simply set the fragment color to be the maincolor specified
    in the material.

    \quotefromfile simplecustommaterial/shaders/gl3/simpleColor.frag
    \skipto uniform vec3 maincolor;
    \printuntil ;
    \skipto void main()
    \printto

    Next, we create \l {ShaderProgram}{ShaderPrograms} from the shaders.

    \snippet simplecustommaterial/SimpleMaterial.qml 2

    Finally the shader programs are used in the Techniques corresponding to a specific
    Api profile.

    \snippet simplecustommaterial/SimpleMaterial.qml 3
*/
