/// <summary>
/// Creates the LinearWrap sampler state.
/// </summary>
/// <param name="uv">The Ultraviolet context.</param>
/// <returns>The sampler state that was created.</returns>
public static OpenGLSamplerState CreateLinearWrap(UltravioletContext uv)
{
var state = new OpenGLSamplerState(uv);
state.Filter = TextureFilter.Linear;
state.AddressU = TextureAddressMode.Wrap;
state.AddressV = TextureAddressMode.Wrap;
state.AddressW = TextureAddressMode.Wrap;
state.MakeImmutable();
return(state);
}
/// <summary>
/// Creates the AnisotropicClamp sampler state.
/// </summary>
/// <param name="uv">The Ultraviolet context.</param>
/// <returns>The sampler state that was created.</returns>
public static OpenGLSamplerState CreateAnisotropicClamp(UltravioletContext uv)
{
var state = new OpenGLSamplerState(uv);
state.Filter = TextureFilter.Anisotropic;
state.AddressU = TextureAddressMode.Clamp;
state.AddressV = TextureAddressMode.Clamp;
state.AddressW = TextureAddressMode.Clamp;
state.MakeImmutable();
return(state);
}
/// <summary>
/// Applies the specified sampler state to this sampler.
/// </summary>
/// <param name="state">The sampler state to apply.</param>
public void ApplySamplerState(SamplerState state)
{
Contract.Require(state, nameof(state));
var textureWrapR = OpenGLSamplerState.GetTextureAddressModeGL(state.AddressW);
if (textureWrapR != cachedTextureWrapR)
{
cachedTextureWrapR = textureWrapR;
gl.SamplerParameteri(sampler, gl.GL_TEXTURE_WRAP_R, textureWrapR);
gl.ThrowIfError();
}
var textureWrapS = OpenGLSamplerState.GetTextureAddressModeGL(state.AddressU);
if (textureWrapS != cachedTextureWrapS)
{
cachedTextureWrapS = textureWrapS;
gl.SamplerParameteri(sampler, gl.GL_TEXTURE_WRAP_S, textureWrapS);
gl.ThrowIfError();
}
var textureWrapT = OpenGLSamplerState.GetTextureAddressModeGL(state.AddressV);
if (textureWrapT != cachedTextureWrapT)
{
cachedTextureWrapT = textureWrapT;
gl.SamplerParameteri(sampler, gl.GL_TEXTURE_WRAP_T, textureWrapT);
gl.ThrowIfError();
}
if (state.MipMapLevelOfDetailBias != 0)
{
if (gl.IsMapMapLevelOfDetailBiasAvailable)
{
if (cachedMipMapLODBias != state.MipMapLevelOfDetailBias)
{
cachedMipMapLODBias = state.MipMapLevelOfDetailBias;
gl.SamplerParameterf(sampler, gl.GL_TEXTURE_LOD_BIAS, state.MipMapLevelOfDetailBias);
gl.ThrowIfError();
}
}
else
{
throw new NotSupportedException(OpenGLStrings.UnsupportedLODBiasGLES);
}
}
switch (state.Filter)
{
case TextureFilter.Point:
if (cachedMaxAnisotropy != 1f)
{
cachedMaxAnisotropy = 1f;
gl.SamplerParameterf(sampler, gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, 1f);
gl.ThrowIfError();
}
if (cachedMinFilter != gl.GL_NEAREST)
{
cachedMinFilter = gl.GL_NEAREST;
gl.SamplerParameterf(sampler, gl.GL_TEXTURE_MIN_FILTER, (int)gl.GL_NEAREST);
gl.ThrowIfError();
}
if (cachedMagFilter != gl.GL_NEAREST)
{
cachedMagFilter = gl.GL_NEAREST;
gl.SamplerParameterf(sampler, gl.GL_TEXTURE_MAG_FILTER, (int)gl.GL_NEAREST);
gl.ThrowIfError();
}
break;
case TextureFilter.Linear:
if (gl.IsAnisotropicFilteringAvailable)
{
if (cachedMaxAnisotropy != 1f)
{
cachedMaxAnisotropy = 1f;
gl.SamplerParameterf(sampler, gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, 1f);
gl.ThrowIfError();
}
}
if (cachedMinFilter != gl.GL_LINEAR)
{
cachedMinFilter = gl.GL_LINEAR;
gl.SamplerParameteri(sampler, gl.GL_TEXTURE_MIN_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
}
if (cachedMagFilter != gl.GL_LINEAR)
{
cachedMagFilter = gl.GL_LINEAR;
gl.SamplerParameteri(sampler, gl.GL_TEXTURE_MAG_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
}
break;
case TextureFilter.Anisotropic:
if (gl.IsAnisotropicFilteringAvailable)
{
var maxAnisotropy = Math.Min(1f, state.MaxAnisotropy);
if (maxAnisotropy != cachedMaxAnisotropy)
{
cachedMaxAnisotropy = maxAnisotropy;
gl.SamplerParameterf(sampler, gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, maxAnisotropy);
gl.ThrowIfError();
}
}
if (cachedMinFilter != gl.GL_LINEAR)
{
cachedMinFilter = gl.GL_LINEAR;
gl.SamplerParameteri(sampler, gl.GL_TEXTURE_MIN_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
}
if (cachedMagFilter != gl.GL_LINEAR)
{
cachedMagFilter = gl.GL_LINEAR;
gl.SamplerParameteri(sampler, gl.GL_TEXTURE_MAG_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
}
break;
default:
throw new NotSupportedException();
}
}