SamplerState.Direct3D.cs

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// Copyright (c) 2014 Silicon Studio Corp. (http://siliconstudio.co.jp)
// This file is distributed under GPL v3. See LICENSE.md for details.
#if SILICONSTUDIO_PARADOX_GRAPHICS_API_DIRECT3D 
using System;
using SharpDX;

using SiliconStudio.Core.Mathematics;

namespace SiliconStudio.Paradox.Graphics
{
    /// <summary>
    /// Describes a sampler state used for texture sampling.
    /// </summary>
    public partial class SamplerState
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="SamplerState"/> class.
        /// </summary>
        /// <param name="device">The device.</param>
        /// <param name="name">The name.</param>
        /// <param name="samplerStateDescription">The sampler state description.</param>
        private SamplerState(GraphicsDevice device, SamplerStateDescription samplerStateDescription) : base(device)
        {
            Description = samplerStateDescription;

            CreateNativeDeviceChild();
        }

        /// <inheritdoc/>
        protected internal override void OnDestroyed()
        {
            base.OnDestroyed();
            DestroyImpl();
        }

        /// <inheritdoc/>
        protected internal override bool OnRecreate()
        {
            base.OnRecreate();
            CreateNativeDeviceChild();
            return true;
        }

        private void CreateNativeDeviceChild()
        {
            SharpDX.Direct3D11.SamplerStateDescription nativeDescription;

            nativeDescription.AddressU = (SharpDX.Direct3D11.TextureAddressMode)Description.AddressU;
            nativeDescription.AddressV = (SharpDX.Direct3D11.TextureAddressMode)Description.AddressV;
            nativeDescription.AddressW = (SharpDX.Direct3D11.TextureAddressMode)Description.AddressW;
            nativeDescription.BorderColor = ColorHelper.Convert(Description.BorderColor);
            nativeDescription.ComparisonFunction = (SharpDX.Direct3D11.Comparison)Description.CompareFunction;
            nativeDescription.Filter = (SharpDX.Direct3D11.Filter)Description.Filter;
            nativeDescription.MaximumAnisotropy = Description.MaxAnisotropy;
            nativeDescription.MaximumLod = Description.MaxMipLevel;
            nativeDescription.MinimumLod = Description.MinMipLevel;
            nativeDescription.MipLodBias = Description.MipMapLevelOfDetailBias;

            // For 9.1, anisotropy cannot be larger then 2
            // mirror once is not supported either
            if (GraphicsDevice.Features.Profile == GraphicsProfile.Level_9_1)
            {
                // TODO: Min with user-value instead?
                nativeDescription.MaximumAnisotropy = 2;

                if (nativeDescription.AddressU == SharpDX.Direct3D11.TextureAddressMode.MirrorOnce)
                    nativeDescription.AddressU = SharpDX.Direct3D11.TextureAddressMode.Mirror;
                if (nativeDescription.AddressV == SharpDX.Direct3D11.TextureAddressMode.MirrorOnce)
                    nativeDescription.AddressV = SharpDX.Direct3D11.TextureAddressMode.Mirror;
                if (nativeDescription.AddressW == SharpDX.Direct3D11.TextureAddressMode.MirrorOnce)
                    nativeDescription.AddressW = SharpDX.Direct3D11.TextureAddressMode.Mirror;
            }

            NativeDeviceChild = new SharpDX.Direct3D11.SamplerState(NativeDevice, nativeDescription);
        }
    }
} 
#endif