/// <summary>
/// Constructs a new instance of the texture bindings manager.
/// </summary>
/// <param name="context">The GPU context that the texture bindings manager belongs to</param>
/// <param name="channel">The GPU channel that the texture bindings manager belongs to</param>
/// <param name="poolCache">Texture pools cache used to get texture pools from</param>
/// <param name="scales">Array where the scales for the currently bound textures are stored</param>
/// <param name="isCompute">True if the bindings manager is used for the compute engine</param>
public TextureBindingsManager(GpuContext context, GpuChannel channel, TexturePoolCache poolCache, float[] scales, bool isCompute)
{
_context = context;
_channel = channel;
_texturePoolCache = poolCache;
_scales = scales;
_isCompute = isCompute;
int stages = isCompute ? 1 : Constants.ShaderStages;
_textureBindings = new TextureBindingInfo[stages][];
_imageBindings = new TextureBindingInfo[stages][];
_textureState = new TextureStatePerStage[stages][];
_imageState = new TextureStatePerStage[stages][];
_textureBindingsCount = new int[stages];
_imageBindingsCount = new int[stages];
for (int stage = 0; stage < stages; stage++)
{
_textureBindings[stage] = new TextureBindingInfo[InitialTextureStateSize];
_imageBindings[stage] = new TextureBindingInfo[InitialImageStateSize];
_textureState[stage] = new TextureStatePerStage[InitialTextureStateSize];
_imageState[stage] = new TextureStatePerStage[InitialImageStateSize];
}
}
/// <summary>
/// Rents the texture bindings array for a given stage, so that they can be modified.
/// </summary>
/// <param name="stage">Shader stage number, or 0 for compute shaders</param>
/// <param name="count">The number of bindings needed</param>
/// <returns>The texture bindings array</returns>
public TextureBindingInfo[] RentTextureBindings(int stage, int count)
{
if (count > _textureBindings[stage].Length)
{
Array.Resize(ref _textureBindings[stage], count);
Array.Resize(ref _textureState[stage], count);
}
int toClear = Math.Max(_textureBindingsCount[stage], count);
TextureStatePerStage[] state = _textureState[stage];
for (int i = 0; i < toClear; i++)
{
state[i] = new TextureStatePerStage();
}
_textureBindingsCount[stage] = count;
return(_textureBindings[stage]);
}
/// <summary>
/// Binds images for a given shader stage.
/// </summary>
/// <param name="stage">Shader stage number, or 0 for compute shaders</param>
/// <param name="bindings">Image bindings</param>
public void SetImages(int stage, TextureBindingInfo[] bindings)
{
_imageBindings[stage] = bindings;
_imageState[stage] = new TextureStatePerStage[bindings.Length];
}
