/// <summary>Initializes a new grid consisting of one or more quads</summary>
/// <param name="graphicsDevice">Graphics device the grid will be created on</param>
/// <param name="min">
/// Lesser coordinates of the world region that will be covered by the grid
/// </param>
/// <param name="max">
/// Greater coordinates of the world region that will be covered by the grid
/// </param>
/// <param name="segmentsX">
/// Number of segments the grid will have on the X axis
/// </param>
/// <param name="segmentsZ">
/// Number of segments the grid will have on the Z axis
/// </param>
public WaterGrid(
GraphicsDevice graphicsDevice,
Vector2 min, Vector2 max,
int segmentsX, int segmentsZ
) :
base(graphicsDevice, getIndexCount(segmentsX, segmentsZ))
{
this.graphicsDevice = graphicsDevice;
// Create and fill the vertex buffer
{
WaterVertex[] vertices = buildVertexArray(min, max, segmentsX, segmentsZ);
this.vertexCount = vertices.Length;
this.vertexBuffer = new VertexBuffer(
graphicsDevice, typeof(WaterVertex), vertices.Length, BufferUsage.None
);
this.vertexBuffer.SetData <WaterVertex>(vertices);
}
// Create and fill the index buffer
{
short[] indices = TriangleStripIndexBuilder.BuildAlternatingStrip(
segmentsX, segmentsZ
);
this.indexCount = indices.Length;
this.indexBuffer = new IndexBuffer(
graphicsDevice, typeof(short), indices.Length, BufferUsage.None
);
this.indexBuffer.SetData <short>(indices);
}
}
/// <summary>
/// Calculates the number of indices required for the water surface
/// </summary>
/// <param name="segmentsX">Number of segments in X direction</param>
/// <param name="segmentsZ">Number of segments in Z direction</param>
/// <returns>The number of indices required</returns>
private static int getIndexCount(int segmentsX, int segmentsZ)
{
return(TriangleStripIndexBuilder.CountAlternatingStripIndices(segmentsX, segmentsZ));
}
