/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: http://www.qt-project.org/legal
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** This file is part of the Qt3D module of the Qt Toolkit.
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
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****************************************************************************/

import Qt3D 2.0
import Qt3D.Renderer 2.0

Effect {
    id: root

    property Texture2D shadowTexture
    property Light light

    // These parameters act as default values for the effect. They take
    // priority over any parameters specified in the RenderPasses below
    // (none provided in this example). In turn these parameters can be
    // overwritten by specifying them in a Material that references this
    // effect.
    // The priority order is:
    //
    // Material -> Effect -> Technique -> RenderPass -> GLSL default values
    parameters: [
        Parameter { name: "lightViewProjection"; value: root.light.lightViewProjection },
        Parameter { name: "lightPosition";  value: root.light.lightPosition },
        Parameter { name: "lightIntensity"; value: root.light.lightIntensity },

        Parameter { name: "shadowMapTexture"; value: root.shadowTexture }
    ]

    techniques: [
        Technique {
            openGLFilter {
                api: OpenGLFilter.Desktop
                profile: OpenGLFilter.Core
                majorVersion: 3
                minorVersion: 2
            }

            renderPasses: [
                RenderPass {
                    annotations: [ Annotation { name: "pass"; value: "shadowmap" } ]

                    shaderProgram: ShaderProgram {
                        vertexShaderCode:   loadSource("qrc:/shaders/shadowmap.vert")
                        fragmentShaderCode: loadSource("qrc:/shaders/shadowmap.frag")
                    }

                    renderStates: [
                        PolygonOffset { factor: 4; units: 4 },
                        DepthTest { func: DepthTest.Less }
                    ]
                },

                RenderPass {
                    annotations: [ Annotation { name : "pass"; value : "forward" } ]

                    // The bindings property allows us to map from names of parameters (uniforms or vertex attributes)
                    // within a shader to more friendly names in QML. By default the parameter names are exposed from
                    // the shader so we only need to add add mappings where the names differ. E.g. here we map from the
                    // ka uniform name in the shader to a property called ambient
                    bindings: [
                        // Uniforms (those provided by the user)
                        ParameterMapping { parameterName: "ambient";  shaderVariableName: "ka"; bindingType: ParameterMapping.Uniform },
                        ParameterMapping { parameterName: "diffuse";  shaderVariableName: "kd"; bindingType: ParameterMapping.Uniform },
                        ParameterMapping { parameterName: "specular"; shaderVariableName: "ks"; bindingType: ParameterMapping.Uniform }
                    ]

                    shaderProgram: ShaderProgram {
                        vertexShaderCode:   loadSource("qrc:/shaders/ads.vert")
                        fragmentShaderCode: loadSource("qrc:/shaders/ads.frag")
                    }

                    // no special render state set => use the default set of states
                }
            ]
        },
        Technique {
            openGLFilter {
                api: OpenGLFilter.ES
                majorVersion: 3
                minorVersion: 0
            }

            renderPasses: [
                RenderPass {
                    annotations: [ Annotation { name: "pass"; value: "shadowmap" } ]

                    shaderProgram: ShaderProgram {
                        vertexShaderCode:   loadSource("qrc:/shaders/es3/shadowmap.vert")
                        fragmentShaderCode: loadSource("qrc:/shaders/es3/shadowmap.frag")
                    }

                    renderStates: [
                        PolygonOffset { factor: 4; units: 4 },
                        DepthTest { func: DepthTest.Less }
                    ]
                },

                RenderPass {
                    annotations: [ Annotation { name : "pass"; value : "forward" } ]

                    bindings: [
                        ParameterMapping { parameterName: "ambient";  shaderVariableName: "ka"; bindingType: ParameterMapping.Uniform },
                        ParameterMapping { parameterName: "diffuse";  shaderVariableName: "kd"; bindingType: ParameterMapping.Uniform },
                        ParameterMapping { parameterName: "specular"; shaderVariableName: "ks"; bindingType: ParameterMapping.Uniform }
                    ]

                    shaderProgram: ShaderProgram {
                        vertexShaderCode:   loadSource("qrc:/shaders/es3/ads.vert")
                        fragmentShaderCode: loadSource("qrc:/shaders/es3/ads.frag")
                    }
                }
            ]
        }
    ]
}