Module: Gsplat::Backend::RubyRasterizeToPixels

Defined in:
lib/gsplat/backend/ruby/rasterize_to_pixels.rb

Overview

Tile-accelerated Numo rasterization forward pass.

Class Method Summary collapse

Class Method Details

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

rubocop:disable Metrics/ParameterLists



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# File 'lib/gsplat/backend/ruby/rasterize_to_pixels.rb', line 10

def forward(means2d, conics, colors, opacities, backgrounds, masks, width, height,
            tile_size, isect_offsets, flatten_ids)
  # rubocop:enable Metrics/ParameterLists
  inputs = validate_inputs(
    means2d, conics, colors, opacities, backgrounds, masks, width, height,
    tile_size, isect_offsets, flatten_ids
  )
  means2d, conics, colors, opacities, backgrounds, masks, isect_offsets, flatten_ids = inputs
  camera_count, gaussian_count = means2d.shape[0...2]
  channel_count = colors.shape[-1]
  tile_height, tile_width = isect_offsets.shape[-2..]
  render_colors = means2d.class.zeros(camera_count, height, width, channel_count)
  render_alphas = means2d.class.zeros(camera_count, height, width, 1)
  last_ids = Numo::Int32.zeros(camera_count, height, width)
  flattened_means = means2d.reshape(camera_count * gaussian_count, 2)
  flattened_conics = conics.reshape(camera_count * gaussian_count, 3)
  flattened_colors = colors.reshape(camera_count * gaussian_count, channel_count)
  flattened_opacities = opacities.reshape(camera_count * gaussian_count)
  camera_count.times do |camera_index|
    tile_height.times do |tile_y|
      tile_width.times do |tile_x|
        render_tile!(
          render_colors,
          render_alphas,
          last_ids,
          flattened_means,
          flattened_conics,
          flattened_colors,
          flattened_opacities,
          backgrounds,
          masks,
          isect_offsets,
          flatten_ids,
          camera_index,
          tile_x,
          tile_y,
          width,
          height,
          tile_size
        )
      end
    end
  end
  [render_colors, render_alphas, last_ids]
end