/// <summary>
/// Bind a <see cref="Texture"/> to this ImageUnit (core function).
/// </summary>
/// <param name="ctx">
/// The <see cref="GraphicsContext"/> managing this ImageUnit.
/// </param>
/// <param name="texture">
/// The <see cref="uint"/> that specifies the name of the texture to be bound to this ImageUnit.
/// </param>
/// <param name="unitState">
/// Specifies the state of the image unit.
/// </param>
internal void Bind(GraphicsContext ctx, Texture texture, ImageUnitState unitState)
{
GraphicsResource.CheckCurrentContext(ctx);
if (unitState == null)
{
throw new ArgumentNullException("unitState");
}
uint bindTextureName = texture != null ? texture.ObjectName : GraphicsResource.InvalidObjectName;
Texture currTexture = Texture;
uint currTextureName = currTexture != null ? currTexture.ObjectName : GraphicsResource.InvalidObjectName;
// Bind the texture on the image unit, if necessary
bool bindImageTexture = false;
#if ENABLE_LAZY_IMAGE_UNIT_BINDING
bindImageTexture |= currTextureName != bindTextureName;
bindImageTexture |= this != unitState;
#else
bindImageTexture = true;
#endif
if (bindImageTexture)
{
// Since here, the texture is bound to the texture unit
Gl.BindImageTexture(Index, bindTextureName, unitState.Level, unitState.Layered, unitState.Layer, unitState.Access, unitState.InternalFormat);
Texture = texture;
}
else
{
// Texture already bound to image unit, Gl.BindImageTexture not necessary
}
}
