Class: Quake::Renderer::GLViewBlend

Inherits:
Object
  • Object
show all
Defined in:
lib/quake/renderer/gl_view_blend.rb

Overview

Renders Quake GL polyblend overlays from view.c color shifts.

Defined Under Namespace

Classes: CShift

Constant Summary collapse

EMPTY_CSHIFT = 
CShift.new(color: [130, 80, 50], percent: 0)
WATER_CSHIFT = 
CShift.new(color: [130, 80, 50], percent: 128)
SLIME_CSHIFT = 
CShift.new(color: [0, 25, 5], percent: 150)
LAVA_CSHIFT = 
CShift.new(color: [255, 80, 0], percent: 150)
BONUS_COLOR = 
[215, 186, 69].freeze
DAMAGE_ARMOR_COLOR = 
[200, 100, 100].freeze
DAMAGE_MIXED_COLOR = 
[220, 50, 50].freeze
DAMAGE_BLOOD_COLOR = 
[255, 0, 0].freeze

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.bonus_cshift(percent) ⇒ Object 



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# File 'lib/quake/renderer/gl_view_blend.rb', line 52

def self.bonus_cshift(percent)
  CShift.new(color: BONUS_COLOR, percent: percent.to_f.clamp(0.0, 50.0))
end

.calc_blend(cshifts, cshift_percent: 100.0) ⇒ Object 



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# File 'lib/quake/renderer/gl_view_blend.rb', line 72

def self.calc_blend(cshifts, cshift_percent: 100.0)
  r = 0.0
  g = 0.0
  b = 0.0
  a = 0.0

  cshifts.each do |shift|
    next if cshift_percent.zero?

    a2 = ((shift.percent.to_f * cshift_percent.to_f) / 100.0) / 255.0
    next if a2.zero?

    a += a2 * (1.0 - a)
    a2 /= a
    r = r * (1.0 - a2) + shift.color[0] * a2
    g = g * (1.0 - a2) + shift.color[1] * a2
    b = b * (1.0 - a2) + shift.color[2] * a2
  end

  [r / 255.0, g / 255.0, b / 255.0, a.clamp(0.0, 1.0)]
end

.contents_cshift(contents) ⇒ Object 



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# File 'lib/quake/renderer/gl_view_blend.rb', line 21

def self.contents_cshift(contents)
  case contents
  when Physics::CONTENTS_EMPTY, Physics::CONTENTS_SOLID
    EMPTY_CSHIFT
  when Physics::CONTENTS_LAVA
    LAVA_CSHIFT
  when Physics::CONTENTS_SLIME
    SLIME_CSHIFT
  else
    WATER_CSHIFT
  end
end

.damage_cshift(armor:, blood:, current_percent: 0.0) ⇒ Object 



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# File 'lib/quake/renderer/gl_view_blend.rb', line 56

def self.damage_cshift(armor:, blood:, current_percent: 0.0)
  armor = armor.to_f
  blood = blood.to_f
  count = blood * 0.5 + armor * 0.5
  count = 10.0 if count < 10.0
  percent = (current_percent.to_f + 3.0 * count).clamp(0.0, 150.0)
  color = if armor > blood
            DAMAGE_ARMOR_COLOR
          elsif armor.positive?
            DAMAGE_MIXED_COLOR
          else
            DAMAGE_BLOOD_COLOR
          end
  CShift.new(color: color, percent: percent)
end

.powerup_cshift(player_state, game_time:) ⇒ Object 



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# File 'lib/quake/renderer/gl_view_blend.rb', line 34

def self.powerup_cshift(player_state, game_time:)
  if powerup_item_active?(player_state, :quad, game_time)
    CShift.new(color: [0, 0, 255], percent: 30)
  elsif powerup_item_active?(player_state, :biosuit, game_time)
    CShift.new(color: [0, 255, 0], percent: 20)
  elsif powerup_item_active?(player_state, :ring, game_time)
    CShift.new(color: [100, 100, 100], percent: 100)
  elsif powerup_item_active?(player_state, :pentagram, game_time)
    CShift.new(color: [255, 255, 0], percent: 30)
  else
    CShift.new(color: [0, 0, 0], percent: 0)
  end
end

.powerup_item_active?(player_state, powerup, game_time) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/quake/renderer/gl_view_blend.rb', line 48

def self.powerup_item_active?(player_state, powerup, game_time)
  player_state&.powerup_item_active?(powerup, game_time: game_time)
end

Instance Method Details

#render(blend) ⇒ Object 



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# File 'lib/quake/renderer/gl_view_blend.rb', line 94

def render(blend)
  return if blend[3].to_f <= 0.0

  GL.MatrixMode(GL::PROJECTION)
  GL.PushMatrix
  GL.LoadIdentity
  GL.Ortho(0, 1, 0, 1, -1, 1)
  GL.MatrixMode(GL::MODELVIEW)
  GL.PushMatrix
  GL.LoadIdentity

  GL.Disable(GL::DEPTH_TEST)
  GL.Disable(GL::CULL_FACE) # 2D pass; scene re-enables culling next frame
  GL.Disable(GL::TEXTURE_2D)
  GL.Enable(GL::BLEND)
  GL.BlendFunc(GL::SRC_ALPHA, GL::ONE_MINUS_SRC_ALPHA)
  GL.Color4f(*blend)
  GL.Begin(GL::QUADS)
  GL.Vertex2f(0.0, 0.0)
  GL.Vertex2f(1.0, 0.0)
  GL.Vertex2f(1.0, 1.0)
  GL.Vertex2f(0.0, 1.0)
  GL.End

  GL.Color4f(1.0, 1.0, 1.0, 1.0)
  GL.Disable(GL::BLEND)
  GL.Enable(GL::TEXTURE_2D)
  GL.Enable(GL::DEPTH_TEST)
  GL.MatrixMode(GL::MODELVIEW)
  GL.PopMatrix
  GL.MatrixMode(GL::PROJECTION)
  GL.PopMatrix
  GL.MatrixMode(GL::MODELVIEW)
end