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#region License
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/* FNA - XNA4 Reimplementation for Desktop Platforms
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* Copyright 2009-2020 Ethan Lee and the MonoGame Team
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*
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* Released under the Microsoft Public License.
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* See LICENSE for details.
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*/
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#endregion
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#region Using Statements
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using Microsoft.Xna.Framework.Graphics;
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#endregion
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namespace Microsoft.Xna.Framework.Content
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{
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internal class VertexDeclarationReader : ContentTypeReader<VertexDeclaration>
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{
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#region Protected Read Method
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protected internal override VertexDeclaration Read(
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ContentReader reader,
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VertexDeclaration existingInstance
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) {
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int vertexStride = reader.ReadInt32();
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int elementCount = reader.ReadInt32();
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VertexElement[] elements = new VertexElement[elementCount];
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for (int i = 0; i < elementCount; i += 1)
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{
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int offset = reader.ReadInt32();
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VertexElementFormat elementFormat = (VertexElementFormat) reader.ReadInt32();
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VertexElementUsage elementUsage = (VertexElementUsage) reader.ReadInt32();
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int usageIndex = reader.ReadInt32();
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elements[i] = new VertexElement(
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offset,
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elementFormat,
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elementUsage,
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usageIndex
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);
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}
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/* TODO: This process generates alot of duplicate VertexDeclarations
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* which in turn complicates other systems trying to share GPU resources
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* like DX11 vertex input layouts.
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*
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* We should consider caching vertex declarations here and returning
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* previously created declarations when they are in our cache.
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*/
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return new VertexDeclaration(vertexStride, elements);
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}
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#endregion
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}
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}
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