public static Texture2D GenerateMipMaps(Device device, global::SharpDX.Toolkit.Graphics.Texture texture)
{
var desc = new Texture2DDescription()
{
Width = texture.Description.Width,
Height = texture.Description.Height,
MipLevels = 0,
ArraySize = 1,
BindFlags = BindFlags.RenderTarget | BindFlags.ShaderResource,
CpuAccessFlags = CpuAccessFlags.None,
Usage = ResourceUsage.Default,
SampleDescription = texture.Description.SampleDescription,
OptionFlags = ResourceOptionFlags.GenerateMipMaps,
Format = texture.Description.Format
};
var textMip = new Texture2D(device, desc);
using (var shaderRes = new ShaderResourceView(device, textMip))
{
device.ImmediateContext.CopySubresourceRegion(texture, 0, null, textMip, 0);
device.ImmediateContext.GenerateMips(shaderRes);
}
return(textMip);
}
/// <summary>
/// Generates the mip maps.
/// </summary>
/// <param name="device">The device.</param>
/// <param name="texture">The texture.</param>
/// <param name="textMip">Returns a new texture with mipmaps if succeeded. Otherwise returns the input texture</param>
/// <returns>True succeed. False: Format not supported.</returns>
/// <exception cref="InvalidDataException">Input texture is invalid.</exception>
public static bool GenerateMipMaps(Device device, global::SharpDX.Toolkit.Graphics.Texture texture, out Resource textMip)
{
textMip = null;
//Check texture format support: https://msdn.microsoft.com/en-us/library/windows/desktop/ff476426(v=vs.85).aspx
switch (texture.Description.Format)
{
case global::SharpDX.DXGI.Format.R8G8B8A8_UNorm:
case global::SharpDX.DXGI.Format.R8G8B8A8_UNorm_SRgb:
case global::SharpDX.DXGI.Format.B5G6R5_UNorm:
case global::SharpDX.DXGI.Format.B8G8R8A8_UNorm:
case global::SharpDX.DXGI.Format.B8G8R8A8_UNorm_SRgb:
case global::SharpDX.DXGI.Format.B8G8R8X8_UNorm:
case global::SharpDX.DXGI.Format.B8G8R8X8_UNorm_SRgb:
case global::SharpDX.DXGI.Format.R16G16B16A16_Float:
case global::SharpDX.DXGI.Format.R16G16B16A16_UNorm:
case global::SharpDX.DXGI.Format.R16G16_Float:
case global::SharpDX.DXGI.Format.R16G16_UNorm:
case global::SharpDX.DXGI.Format.R32_Float:
case global::SharpDX.DXGI.Format.R32G32B32A32_Float:
case global::SharpDX.DXGI.Format.B4G4R4A4_UNorm:
case global::SharpDX.DXGI.Format.R32G32B32_Float:
case global::SharpDX.DXGI.Format.R16G16B16A16_SNorm:
case global::SharpDX.DXGI.Format.R32G32_Float:
case global::SharpDX.DXGI.Format.R10G10B10A2_UNorm:
case global::SharpDX.DXGI.Format.R11G11B10_Float:
case global::SharpDX.DXGI.Format.R8G8B8A8_SNorm:
case global::SharpDX.DXGI.Format.R16G16_SNorm:
case global::SharpDX.DXGI.Format.R8G8_UNorm:
case global::SharpDX.DXGI.Format.R8G8_SNorm:
case global::SharpDX.DXGI.Format.R16_Float:
case global::SharpDX.DXGI.Format.R16_UNorm:
case global::SharpDX.DXGI.Format.R16_SNorm:
case global::SharpDX.DXGI.Format.R8_UNorm:
case global::SharpDX.DXGI.Format.R8_SNorm:
case global::SharpDX.DXGI.Format.A8_UNorm:
case global::SharpDX.DXGI.Format.B5G5R5A1_UNorm:
break;
default:
textMip = texture.Resource.QueryInterface <Resource>(); //Format not support, return the original texture.
return(false);
}
switch (texture.Description.Dimension)
{
case global::SharpDX.Toolkit.Graphics.TextureDimension.Texture1D:
var desc1D = new Texture1DDescription()
{
Width = texture.Description.Width,
MipLevels = 0,
ArraySize = 1,
BindFlags = BindFlags.RenderTarget | BindFlags.ShaderResource,
CpuAccessFlags = CpuAccessFlags.None,
Usage = ResourceUsage.Default,
OptionFlags = ResourceOptionFlags.GenerateMipMaps,
Format = texture.Description.Format
};
textMip = new Texture1D(device, desc1D);
break;
case global::SharpDX.Toolkit.Graphics.TextureDimension.Texture2D:
var desc2D = new Texture2DDescription()
{
Width = texture.Description.Width,
Height = texture.Description.Height,
MipLevels = 0,
ArraySize = 1,
BindFlags = BindFlags.RenderTarget | BindFlags.ShaderResource,
CpuAccessFlags = CpuAccessFlags.None,
Usage = ResourceUsage.Default,
SampleDescription = texture.Description.SampleDescription,
OptionFlags = ResourceOptionFlags.GenerateMipMaps,
Format = texture.Description.Format
};
textMip = new Texture2D(device, desc2D);
break;
case global::SharpDX.Toolkit.Graphics.TextureDimension.Texture3D:
var desc3D = new Texture3DDescription()
{
Width = texture.Description.Width,
Height = texture.Description.Height,
Depth = texture.Description.Depth,
MipLevels = 0,
BindFlags = BindFlags.RenderTarget | BindFlags.ShaderResource,
CpuAccessFlags = CpuAccessFlags.None,
Usage = ResourceUsage.Default,
OptionFlags = ResourceOptionFlags.GenerateMipMaps,
Format = texture.Description.Format
};
textMip = new Texture3D(device, desc3D);
break;
case global::SharpDX.Toolkit.Graphics.TextureDimension.TextureCube:
var descCube = new Texture3DDescription()
{
Width = texture.Description.Width,
Height = texture.Description.Height,
Depth = texture.Description.ArraySize,
MipLevels = 0,
BindFlags = BindFlags.RenderTarget | BindFlags.ShaderResource,
CpuAccessFlags = CpuAccessFlags.None,
Usage = ResourceUsage.Default,
OptionFlags = ResourceOptionFlags.GenerateMipMaps,
Format = texture.Description.Format
};
textMip = new Texture3D(device, descCube);
break;
default:
throw new InvalidDataException("Input texture is invalid.");
}
using (var shaderRes = new ShaderResourceView(device, textMip))
{
device.ImmediateContext.CopySubresourceRegion(texture, 0, null, textMip, 0);
device.ImmediateContext.GenerateMips(shaderRes);
}
return(true);
}
