forked from MoonsideGames/MoonWorks
83 lines
2.2 KiB
C#
83 lines
2.2 KiB
C#
using System;
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using System.Runtime.InteropServices;
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using RefreshCS;
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namespace MoonWorks.Graphics
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{
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/// <summary>
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/// Buffers are generic data containers that can be used by the GPU.
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/// </summary>
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public class Buffer : GraphicsResource
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{
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protected override Action<IntPtr, IntPtr> QueueDestroyFunction => Refresh.Refresh_QueueDestroyBuffer;
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/// <summary>
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/// Size in bytes.
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/// </summary>
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public uint Size { get; }
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/// <summary>
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/// Creates a buffer of appropriate size given a type and element count.
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/// </summary>
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/// <typeparam name="T">The type that the buffer will contain.</typeparam>
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/// <param name="device">The GraphicsDevice.</param>
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/// <param name="usageFlags">Specifies how the buffer will be used.</param>
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/// <param name="elementCount">How many elements of type T the buffer will contain.</param>
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/// <returns></returns>
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public unsafe static Buffer Create<T>(
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GraphicsDevice device,
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BufferUsageFlags usageFlags,
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uint elementCount
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) where T : unmanaged
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{
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return new Buffer(
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device,
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usageFlags,
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(uint) sizeof(T) * elementCount
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);
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}
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/// <summary>
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/// Creates a buffer.
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/// </summary>
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/// <param name="device">An initialized GraphicsDevice.</param>
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/// <param name="usageFlags">Specifies how the buffer will be used.</param>
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/// <param name="sizeInBytes">The length of the array. Cannot be resized.</param>
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public Buffer(
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GraphicsDevice device,
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BufferUsageFlags usageFlags,
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uint sizeInBytes
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) : base(device)
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{
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Handle = Refresh.Refresh_CreateBuffer(
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device.Handle,
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(Refresh.BufferUsageFlags) usageFlags,
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sizeInBytes
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);
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Size = sizeInBytes;
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}
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/// <summary>
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/// Reads data out of a buffer and into an array.
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/// This operation is only guaranteed to read up-to-date data if GraphicsDevice.Wait is called first.
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/// </summary>
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/// <param name="data">The array that data will be copied to.</param>
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/// <param name="dataLengthInBytes">The length of the data to read.</param>
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public unsafe void GetData<T>(
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T[] data,
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uint dataLengthInBytes
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) where T : unmanaged
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{
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fixed (T* ptr = &data[0])
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{
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Refresh.Refresh_GetBufferData(
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Device.Handle,
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Handle,
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(IntPtr) ptr,
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dataLengthInBytes
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);
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}
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}
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}
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}
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