Class: Rendering::BloomEffect

Inherits:
Object
  • Object
show all
Includes:
Effect
Defined in:
lib/engine/rendering/post_processing/bloom_effect.rb

Instance Attribute Summary

Attributes included from Effect

#enabled

Instance Method Summary collapse

Constructor Details

#initialize(threshold: 0.7, intensity: 1.0, blur_passes: 2, blur_scale: 1.0) ⇒ BloomEffect

Returns a new instance of BloomEffect.



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# File 'lib/engine/rendering/post_processing/bloom_effect.rb', line 7

def initialize(threshold: 0.7, intensity: 1.0, blur_passes: 2, blur_scale: 1.0)
  @threshold = threshold
  @intensity = intensity
  @blur_passes = blur_passes
  @blur_scale = blur_scale

  setup_materials
end

Instance Method Details

#apply(input_rt, output_rt, screen_quad) ⇒ Object 



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# File 'lib/engine/rendering/post_processing/bloom_effect.rb', line 16

def apply(input_rt, output_rt, screen_quad)
  ensure_textures(input_rt.width, input_rt.height)
  Engine::GL.Disable(Engine::GL::DEPTH_TEST)

  # Pass 1: Extract bright pixels
  @ping.bind
  Engine::GL.Clear(Engine::GL::COLOR_BUFFER_BIT)
  screen_quad.draw(@threshold_material, input_rt.color_texture)

  # Pass 2+: Blur passes (ping-pong between internal textures)
  @blur_passes.times do
    # Horizontal blur
    @pong.bind
    Engine::GL.Clear(Engine::GL::COLOR_BUFFER_BIT)
    @blur_material.set_vec2("direction", [1.0, 0.0])
    screen_quad.draw(@blur_material, @ping.color_texture)

    # Vertical blur
    @ping.bind
    Engine::GL.Clear(Engine::GL::COLOR_BUFFER_BIT)
    @blur_material.set_vec2("direction", [0.0, 1.0])
    screen_quad.draw(@blur_material, @pong.color_texture)
  end

  # Pass 3: Combine original + bloom
  output_rt.bind
  Engine::GL.Clear(Engine::GL::COLOR_BUFFER_BIT)
  @combine_material.set_runtime_texture("screenTexture", input_rt.color_texture)
  @combine_material.set_runtime_texture("bloomTexture", @ping.color_texture)
  screen_quad.draw_with_material(@combine_material)
  output_rt
end