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 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javafx.scene.shape;

/**
 * Defines the format of the vertices in a mesh. A vertex consists of an array
 * of points, normals (optional), and texture coordinates.
 *
 * @since JavaFX 8u40
 */
public final class VertexFormat {

    /**
     * Specifies the format of a vertex that consists of a point and texture coordinates.
     */
    public static final VertexFormat POINT_TEXCOORD = new VertexFormat("POINT_TEXCOORD", 2, 0, -1, 1);

    /**
     * Specifies the format of a vertex that consists of a point, normal and texture coordinates.
     */
    public static final VertexFormat POINT_NORMAL_TEXCOORD = new VertexFormat("POINT_NORMAL_TEXCOORD", 3, 0, 1, 2);

    // For internal use only
    private static final int POINT_ELEMENT_SIZE = 3;
    private static final int NORMAL_ELEMENT_SIZE = 3;
    private static final int TEXCOORD_ELEMENT_SIZE = 2;

    private final String name;
    private final int vertexIndexSize;
    private final int pointIndexOffset;
    private final int normalIndexOffset;
    private final int texCoordIndexOffset;

    private VertexFormat(String name, int vertexIndexSize,
            int pointIndexOffset, int normalIndexOffset, int texCoordIndexOffset) {
        this.name = name;
        this.vertexIndexSize = vertexIndexSize;
        this.pointIndexOffset = pointIndexOffset;
        this.normalIndexOffset = normalIndexOffset;
        this.texCoordIndexOffset = texCoordIndexOffset;
    }

    int getPointElementSize() {
        return POINT_ELEMENT_SIZE;
    }

    int getNormalElementSize() {
        return NORMAL_ELEMENT_SIZE;
    }

    int getTexCoordElementSize() {
        return TEXCOORD_ELEMENT_SIZE;
    }

    /**
     * Returns the number of component indices that represents a vertex. For example,
     * a POINT_TEXCOORD vertex consists of 2 indices, one for point component and
     * the other for texture coordinates component. Hence its value will be 2.
     *
     * @return the number of component indices
     */
    public int getVertexIndexSize() {
        return vertexIndexSize;
    }

    /**
     * Returns the index offset in the face array of the point component within
     * a vertex.
     *
     * @return the offset to the point component.
     */
    public int getPointIndexOffset() {
        return pointIndexOffset;
    }

    /**
     * Returns the index offset in the face array of the normal component within
     * a vertex.
     *
     * @return the offset to the normal component.
     */
    public int getNormalIndexOffset() {
        return normalIndexOffset;
    }

    /**
     * Returns the index offset in the face array of the texture coordinates
     * component within a vertex.
     *
     * @return the offset to the texture coordinates component.
     */
    public int getTexCoordIndexOffset() {
        return texCoordIndexOffset;
    }

    @Override
    public String toString() {
        return name;
    }

}