/// <inheritdoc/>
public void SetTexture(Int32 sampler, Texture2D texture)
{
Contract.EnsureRange(sampler >= 0 && sampler < maxTextureStages, nameof(sampler));
Contract.EnsureNotDisposed(this, Disposed);
Ultraviolet.ValidateResource(texture);
if (texture != null && texture.BoundForWriting)
{
throw new InvalidOperationException(OpenGLStrings.RenderBufferCannotBeUsedAsTexture);
}
if (texture != null && texture.WillNotBeSampled)
{
throw new InvalidOperationException(OpenGLStrings.RenderBufferWillNotBeSampled);
}
if (this.textures[sampler] != texture)
{
var textureName = (texture == null) ? 0 : ((IOpenGLResource)texture).OpenGLName;
OpenGLState.ActiveTexture((uint)(gl.GL_TEXTURE0 + sampler));
OpenGLState.Texture2D(textureName);
if (this.textures[sampler] != null)
{
((IBindableResource)this.textures[sampler]).UnbindRead();
}
this.textures[sampler] = texture;
if (this.textures[sampler] != null)
{
((IBindableResource)this.textures[sampler]).BindRead();
}
if (!capabilities.SupportsIndependentSamplerState)
{
var samplerState = (OpenGLSamplerState)(GetSamplerState(sampler) ?? SamplerState.LinearClamp);
for (int i = 0; i < samplerStates.Length; i++)
{
if (this.textures[i] == texture)
{
samplerState.Apply(sampler);
}
}
}
}
}
/// <summary>
/// Applies the sampler state to the device.
/// </summary>
/// <param name="sampler">The sampler index on which to set the state.</param>
/// <param name="target">GL_TEXTURE_2D or GL_TEXTURE_3D, as appropriate.</param>
internal void Apply(Int32 sampler, UInt32 target)
{
if (Ultraviolet.GetGraphics().Capabilities.SupportsIndependentSamplerState)
{
throw new InvalidOperationException(UltravioletStrings.GenericError);
}
OpenGLState.ActiveTexture((uint)(gl.GL_TEXTURE0 + sampler));
if (Ultraviolet.GetGraphics().Capabilities.Supports3DTextures)
{
gl.TexParameteri(target, gl.GL_TEXTURE_WRAP_R, GetTextureAddressModeGL(AddressW));
gl.ThrowIfError();
}
gl.TexParameteri(target, gl.GL_TEXTURE_WRAP_S, GetTextureAddressModeGL(AddressU));
gl.ThrowIfError();
gl.TexParameteri(target, gl.GL_TEXTURE_WRAP_T, GetTextureAddressModeGL(AddressV));
gl.ThrowIfError();
if (MipMapLevelOfDetailBias != 0)
{
gl.ThrowIfGLES(OpenGLStrings.UnsupportedLODBiasGLES);
gl.TexParameterf(target, gl.GL_TEXTURE_LOD_BIAS, MipMapLevelOfDetailBias);
gl.ThrowIfError();
}
switch (Filter)
{
case TextureFilter.Point:
gl.TexParameterf(target, gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, 1f);
gl.ThrowIfError();
gl.TexParameteri(target, gl.GL_TEXTURE_MIN_FILTER, (int)gl.GL_NEAREST);
gl.ThrowIfError();
gl.TexParameteri(target, gl.GL_TEXTURE_MAG_FILTER, (int)gl.GL_NEAREST);
gl.ThrowIfError();
break;
case TextureFilter.Linear:
if (gl.IsAnisotropicFilteringAvailable)
{
gl.TexParameterf(target, gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, 1f);
gl.ThrowIfError();
}
gl.TexParameteri(target, gl.GL_TEXTURE_MIN_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
gl.TexParameteri(target, gl.GL_TEXTURE_MAG_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
break;
case TextureFilter.Anisotropic:
if (gl.IsAnisotropicFilteringAvailable)
{
gl.TexParameterf(target, gl.GL_TEXTURE_MAX_ANISOTROPY_EXT, Math.Min(1f, MaxAnisotropy));
gl.ThrowIfError();
}
gl.TexParameteri(target, gl.GL_TEXTURE_MIN_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
gl.TexParameteri(target, gl.GL_TEXTURE_MAG_FILTER, (int)gl.GL_LINEAR);
gl.ThrowIfError();
break;
default:
throw new NotSupportedException();
}
}