/// <summary>Initializes a new graphics resource keeper for a static mesh</summary>
/// <param name="graphicsDevice">Graphics device the mesh lives on</param>
/// <param name="vertexCount">Number of vertices that will be required</param>
protected StaticMesh(
GraphicsDevice graphicsDevice, int vertexCount
)
{
this.GraphicsDevice = graphicsDevice;
#if XNA_4
// Create a new vertex buffer with the requested size
this.VertexBuffer = new VertexBuffer(
graphicsDevice, typeof(VertexType), vertexCount, BufferUsage.WriteOnly
);
#else
// Create the vertex declaration
this.stride = VertexDeclarationHelper.GetStride <VertexType>();
this.VertexDeclaration = new VertexDeclaration(
graphicsDevice, VertexDeclarationHelper.BuildElementList <VertexType>()
);
try {
this.ownsVertexDeclaration = true;
// Create a new vertex buffer with the requested size
this.VertexBuffer = new VertexBuffer(
graphicsDevice, typeof(VertexType), vertexCount, BufferUsage.WriteOnly
);
}
catch (Exception) {
this.VertexDeclaration.Dispose();
this.VertexDeclaration = null;
throw;
}
#endif
}
/// <summary>
/// Automatically creates the vertex declaration for the specified type
/// </summary>
/// <typeparam name="VertexType">
/// Vertex type for which the declaration will be built
/// </typeparam>
/// <param name="vertexDeclaration">
/// Output parameter that receives the automatically generated vertex declaration
/// </param>
/// <param name="stride">
/// Output parameter that resizes the size of a particle vertex in bytes
/// </param>
private void autoCreateVertexDeclaration <VertexType>(
out VertexDeclaration vertexDeclaration, out int stride
) where VertexType : struct
{
// In reverse order so we don't loose the pointer if an exception happens
// inside GetStride()
stride = VertexDeclarationHelper.GetStride <VertexType>();
vertexDeclaration = new VertexDeclaration(
GraphicsDevice, VertexDeclarationHelper.BuildElementList <VertexType>()
);
}