/// <summary>
/// Samples at specified address of texture using sampler.
/// </summary>
/// <param name="sampler"></param>
/// <param name="texture"></param>
/// <param name="position"></param>
/// <param name="sample"></param>
public void Sample([NotNull] Operand sampler, [NotNull] Operand texture, [NotNull] Operand position, Operand offset, [NotNull] Operand sample)
{
// We first validate.
switch (texture.Format)
{
case PinFormat.Texture1D:
if (position.Format != PinFormat.Float)
{
throw new ArgumentException("Position must be one-dimensional.");
}
break;
case PinFormat.Texture1DArray:
if (position.Format != PinFormat.Floatx2)
{
throw new ArgumentException("Position must be two-dimensional.");
}
break;
case PinFormat.Texture2D:
if (position.Format != PinFormat.Floatx2)
{
throw new ArgumentException("Position must be two-dimensional.");
}
break;
case PinFormat.Texture2DArray:
if (position.Format != PinFormat.Floatx3)
{
throw new ArgumentException("Position must be three-dimensional.");
}
break;
case PinFormat.TextureCube:
if (position.Format != PinFormat.Floatx3)
{
throw new ArgumentException("Position must be three-dimensional.");
}
break;
case PinFormat.Texture3D:
if (position.Format != PinFormat.Floatx3)
{
throw new ArgumentException("Position must be three-dimensional.");
}
break;
case PinFormat.BufferTexture:
if (position.Format != PinFormat.Integer)
{
throw new ArgumentException("Position must be one dimensional.");
}
break;
default:
break;
}
compiler.Sample(sampler.Name, texture.Name, position.Name,
offset != null ? offset.Name : -1, sample.Name);
}