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import QtQuick 2.0
import ShaderReader 1.0

ShaderEffect {
    id: effect
    property variant source
    property ListModel parameters: ListModel { }
    property bool divider: false
    property real dividerValue: 1.0
    property real targetWidth: 0
    property real targetHeight: 0
    property alias fragmentShaderFilename: shaderFileReader.fragmentShaderFilename
    property alias vertexShaderFilename: shaderFileReader.vertexShaderFilename
    //property string fragmentShaderFilename
    //property string vertexShaderFilename

    QtObject {
        id: d
        property string fragmentShaderCommon: "
            #ifdef GL_ES
                precision mediump float;
            #else
            #   define lowp
            #   define mediump
            #   define highp
            #endif // GL_ES
        "
    }

    ShaderFileReader {
        id: shaderFileReader
        onFragmentShaderFilenameChanged: {
	    effect.fragmentShader = d.fragmentShaderCommon + shaderFileReader.fragmentShader
        }
        onVertexShaderFilenameChanged: {
            effect.vertexShader = shaderFileReader.vertexShader
        }
    }

    // The following is a workaround for the fact that ShaderEffect
    // doesn't provide a way for shader programs to be read from a file,
    // rather than being inline in the QML file

    //onFragmentShaderFilenameChanged:
    //    fragmentShader = d.fragmentShaderCommon + shaderFileReader.readFile("qml/QtDemo/demos/shaders/" + fragmentShaderFilename)
    //onVertexShaderFilenameChanged:
    //    vertexShader = shaderFileReader.readFile("qml/QtDemo/demos/shaders/" + vertexShaderFilename)
}