/// <summary>
/// Applies the sampler state to the device.
/// </summary>
/// <param name="sampler">The sampler index on which to set the state.</param>
internal void Apply(Int32 sampler)
{
Contract.EnsureNotDisposed(this, Disposed);
if (Ultraviolet.GetGraphics().Capabilities.SupportsIndependentSamplerState)
{
throw new InvalidOperationException(UltravioletStrings.GenericError);
}
OpenGLState.ActiveTexture((uint)(gl.GL_TEXTURE0 + sampler));
gl.TexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_WRAP_S, GetTextureAddressModeGL(AddressU));
gl.ThrowIfError();
gl.TexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_WRAP_T, GetTextureAddressModeGL(AddressV));
gl.ThrowIfError();
if (MipMapLevelOfDetailBias != 0)
{
gl.ThrowIfGLES(OpenGLStrings.UnsupportedLODBiasGLES);
gl.TexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_LOD_BIAS, MipMapLevelOfDetailBias);
gl.ThrowIfError();
}
switch (Filter)
{
case TextureFilter.Point:
gl.TexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, 1f);
gl.ThrowIfError();
gl.TexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER, (int)gl.GL_NEAREST);
gl.ThrowIfError();
gl.TexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER, (int)gl.GL_NEAREST);
gl.ThrowIfError();
break;
case TextureFilter.Linear:
if (gl.IsAnisotropicFilteringAvailable)
{
gl.TexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, 1f);
gl.ThrowIfError();
}
gl.TexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
gl.TexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
break;
case TextureFilter.Anisotropic:
if (gl.IsAnisotropicFilteringAvailable)
{
gl.TexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, Math.Min(1f, MaxAnisotropy));
gl.ThrowIfError();
}
gl.TexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
gl.TexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
break;
default:
throw new NotSupportedException();
}
}