Class: RBGL::Engine::Rasterizer::AttributeInterpolator

Inherits:
Object
  • Object
show all
Defined in:
lib/rbgl/engine/rasterizer/attribute_interpolator.rb

Instance Method Summary collapse

Instance Method Details

#interpolate(vertices, weights) ⇒ Object 



7
8
9
10
11
12
13
14
15
16
17
18
 
# File 'lib/rbgl/engine/rasterizer/attribute_interpolator.rb', line 7

def interpolate(vertices, weights)
  result = ShaderIO.new

  interpolated_keys(vertices).each do |key|
    values = vertices.map { |vertex| vertex[key] }
    next if values.any?(&:nil?)

    result[key] = interpolate_values(values, weights)
  end

  result
end

#interpolate_depth(depths, weights) ⇒ Object 



39
40
41
 
# File 'lib/rbgl/engine/rasterizer/attribute_interpolator.rb', line 39

def interpolate_depth(depths, weights)
  scalar(depths, weights)
end

#interpolate_values(values, weights) ⇒ Object 



20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
 
# File 'lib/rbgl/engine/rasterizer/attribute_interpolator.rb', line 20

def interpolate_values(values, weights)
  first = values.first

  case first
  when Larb::Vec2
    vector2(values, weights)
  when Larb::Vec3
    vector3(values, weights)
  when Larb::Vec4
    vector4(values, weights)
  when Larb::Color
    color(values, weights)
  when Numeric
    scalar(values, weights)
  else
    first
  end
end

#perspective_correct_weights(positions, weights) ⇒ Object 



43
44
45
46
47
48
49
50
51
 
# File 'lib/rbgl/engine/rasterizer/attribute_interpolator.rb', line 43

def perspective_correct_weights(positions, weights)
  corrected = positions.zip(weights).map do |position, weight|
    weight * inverse_clip_w(position)
  end
  total = corrected.sum
  return weights if total.zero?

  corrected.map { |weight| weight / total }
end