Class: Gsplat::Ops::RasterizeToPixels

Inherits:
Autograd::Function show all
Defined in:
lib/gsplat/ops/rasterize_to_pixels.rb

Overview

Tile-accelerated alpha compositor.

Class Method Summary collapse

Methods inherited from Autograd::Function

apply

Class Method Details

.backward(context, grad_render_colors, grad_render_alphas) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Propagates pixel color and alpha gradients to projected attributes.



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# File 'lib/gsplat/ops/rasterize_to_pixels.rb', line 41

def backward(context, grad_render_colors, grad_render_alphas)
  saved = context.saved_values
  means2d, conics, colors, opacities, backgrounds, masks, width, height,
    tile_size, offsets, flatten_ids, render_alphas, last_ids, absgrad = saved
  gradients, means2d_absgrad = Backend.dispatch(
    :rasterize_to_pixels_backward,
    means2d,
    conics,
    colors,
    opacities,
    backgrounds,
    masks,
    width,
    height,
    tile_size,
    offsets,
    flatten_ids,
    render_alphas,
    last_ids,
    grad_render_colors,
    grad_render_alphas,
    absgrad: absgrad
  )
  if absgrad && context.inputs[0].is_a?(Autograd::Variable)
    context.inputs[0].accumulate_absgrad(means2d_absgrad)
  end
  [*gradients, nil, nil, nil, nil, nil, nil]
end

.forward(context, means2d, conics, colors, opacities, backgrounds, masks, width, height, tile_size, isect_offsets, flatten_ids, absgrad:) ⇒ Object

rubocop:disable Metrics/ParameterLists



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# File 'lib/gsplat/ops/rasterize_to_pixels.rb', line 15

def forward(context, means2d, conics, colors, opacities, backgrounds, masks, width, height,
            tile_size, isect_offsets, flatten_ids, absgrad:)
  # rubocop:enable Metrics/ParameterLists
  render_colors, render_alphas, last_ids = Backend.dispatch(
    :rasterize_to_pixels_forward,
    means2d,
    conics,
    colors,
    opacities,
    backgrounds,
    masks,
    width,
    height,
    tile_size,
    isect_offsets,
    flatten_ids
  )
  context.save(
    means2d, conics, colors, opacities, backgrounds, masks, width, height,
    tile_size, isect_offsets, flatten_ids, render_alphas, last_ids, absgrad
  )
  [render_colors, render_alphas]
end