Class: Quake::Renderer::GLParticles

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

Overview

Simple particle system for visual effects. Matches Quake's GL R_DrawParticles (r_part.c).

Defined Under Namespace

Classes: Particle

Constant Summary collapse

GRAVITY = 
800.0
MAX_PARTICLES = 
2048
PARTICLE_TEXTURE_SIZE = 
8
PARTICLE_BILLBOARD_SIZE = 
1.5
PARTICLE_SCALE_DISTANCE = 
20.0
PARTICLE_SCALE_FACTOR = 
0.004
DOT_TEXTURE = 
[
  [0, 1, 1, 0, 0, 0, 0, 0],
  [1, 1, 1, 1, 0, 0, 0, 0],
  [1, 1, 1, 1, 0, 0, 0, 0],
  [0, 1, 1, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0, 0, 0]
].freeze
RAMP1 =

Quake ramp tables for color animation (palette indices)

[0x6f, 0x6d, 0x6b, 0x69, 0x67, 0x65, 0x63, 0x61].freeze
RAMP2 = 
[0x6f, 0x6e, 0x6d, 0x6c, 0x6b, 0x6a, 0x68, 0x66].freeze
RAMP3 =

explosion

[0x6d, 0x6b, 0x06, 0x05, 0x04, 0x03, 0x00, 0x00].freeze

Instance Method Summary collapse

Constructor Details

#initialize(palette) ⇒ GLParticles

Returns a new instance of GLParticles.



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# File 'lib/quake/renderer/gl_particles.rb', line 38

def initialize(palette)
  @palette = palette
  @particles = []
end

Instance Method Details

#blob_explosion(pos) ⇒ Object

Quake temp entity TE_TAREXPLOSION: tarbaby blob explosion.



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# File 'lib/quake/renderer/gl_particles.rb', line 273

def blob_explosion(pos)
  1024.times do |i|
    color_idx = i.odd? ? 66 + (rand * 6).to_i : 150 + (rand * 6).to_i
    color = @palette.rgb(color_idx)
    emit(
      x: pos.x + (rand * 32).to_i - 16,
      y: pos.y + (rand * 32).to_i - 16,
      z: pos.z + (rand * 32).to_i - 16,
      vx: (rand * 512).to_i - 256,
      vy: (rand * 512).to_i - 256,
      vz: (rand * 512).to_i - 256,
      r: color[0] / 255.0, g: color[1] / 255.0, b: color[2] / 255.0,
      life: 1.0 + (((rand * 256).to_i & 8) * 0.05),
      ramp_type: i.odd? ? :blob : :blob2
    )
  end
end

#blood(pos, count: 20) ⇒ Object

QuakeWorld TE_BLOOD uses R_RunParticleEffect with blood palette color 73.



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# File 'lib/quake/renderer/gl_particles.rb', line 292

def blood(pos, count: 20)
  run_particle_effect(pos, color: 73, count: count)
end

#color_mapped_explosion(pos, color_start:, color_length:) ⇒ Object

Quake temp entity TE_EXPLOSION2: color-mapped particle explosion.



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# File 'lib/quake/renderer/gl_particles.rb', line 252

def color_mapped_explosion(pos, color_start:, color_length:)
  color_mod = 0
  512.times do
    color_idx = color_start + (color_mod % color_length)
    color_mod += 1
    color = @palette.rgb(color_idx)
    emit(
      x: pos.x + (rand * 32).to_i - 16,
      y: pos.y + (rand * 32).to_i - 16,
      z: pos.z + (rand * 32).to_i - 16,
      vx: (rand * 512).to_i - 256,
      vy: (rand * 512).to_i - 256,
      vz: (rand * 512).to_i - 256,
      r: color[0] / 255.0, g: color[1] / 255.0, b: color[2] / 255.0,
      life: 0.3,
      ramp_type: :blob
    )
  end
end

#entity_particles(pos, time:) ⇒ Object

Quake R_EntityParticles: EF_BRIGHTFIELD particles orbit each alias normal.



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# File 'lib/quake/renderer/gl_particles.rb', line 111

def entity_particles(pos, time:)
  entity_particle_avelocities.each_with_index do |velocities, index|
    yaw = time.to_f * velocities[0]
    pitch = time.to_f * velocities[1]
    roll = time.to_f * velocities[2]
    sy = ::Math.sin(yaw)
    cy = ::Math.cos(yaw)
    sp = ::Math.sin(pitch)
    cp = ::Math.cos(pitch)
    sr = ::Math.sin(roll)
    cr = ::Math.cos(roll)
    forward = [cp * cy, cp * sy, -sp]
    normal = GLAliasModel::ANORMS[index]
    color = @palette.rgb(0x6f)

    emit(
      x: pos.x + normal[0] * 64.0 + forward[0] * 16.0,
      y: pos.y + normal[1] * 64.0 + forward[1] * 16.0,
      z: pos.z + normal[2] * 64.0 + forward[2] * 16.0,
      vx: 0.0, vy: 0.0, vz: 0.0,
      r: color[0] / 255.0, g: color[1] / 255.0, b: color[2] / 255.0,
      life: 0.01,
      ramp_type: :explosion
    )
  end
end

#explosion(pos) ⇒ Object

Explosion burst



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# File 'lib/quake/renderer/gl_particles.rb', line 245

def explosion(pos)
  1024.times do |i|
    emit_explosion_particle(pos, index: i)
  end
end

#gunshot(pos, count: 20) ⇒ Object

Quake temp entity TE_GUNSHOT: a small wall puff at bullet impact.



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# File 'lib/quake/renderer/gl_particles.rb', line 328

def gunshot(pos, count: 20)
  run_particle_effect(pos, color: 0, count: count)
end

#lava_splash(pos) ⇒ Object

Quake temp entity TE_LAVASPLASH.



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# File 'lib/quake/renderer/gl_particles.rb', line 199

def lava_splash(pos)
  (-16...16).each do |i|
    (-16...16).each do |j|
      color_idx = 224 + (rand * 8).to_i
      color = @palette.rgb(color_idx)
      dir_x = j * 8.0 + (rand * 8).to_i
      dir_y = i * 8.0 + (rand * 8).to_i
      dir_z = 256.0
      length = ::Math.sqrt(dir_x * dir_x + dir_y * dir_y + dir_z * dir_z)
      vel = 50.0 + (rand * 64).to_i
      scale = vel / length
      emit(
        x: pos.x + dir_x,
        y: pos.y + dir_y,
        z: pos.z + (rand * 64).to_i,
        vx: dir_x * scale,
        vy: dir_y * scale,
        vz: dir_z * scale,
        r: color[0] / 255.0, g: color[1] / 255.0, b: color[2] / 255.0,
        life: 2.0 + (rand * 32).to_i * 0.02,
        gravity_scale: 1.0
      )
    end
  end
end

#lightning_blood(pos) ⇒ Object

QuakeWorld TE_LIGHTNINGBLOOD.



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# File 'lib/quake/renderer/gl_particles.rb', line 297

def lightning_blood(pos)
  run_particle_effect(pos, color: 225, count: 50)
end

#particle_count ⇒ Object 



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# File 'lib/quake/renderer/gl_particles.rb', line 332

def particle_count
  @particles.size
end

#pickup_effect(pos) ⇒ Object

Item pickup sparkle



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# File 'lib/quake/renderer/gl_particles.rb', line 226

def pickup_effect(pos)
  20.times do
    angle = rand * ::Math::PI * 2.0
    speed = 50.0 + rand * 50.0
    color = @palette.rgb(0x6f) # orange/yellow
    emit(
      x: pos.x, y: pos.y, z: pos.z + 16.0,
      vx: ::Math.cos(angle) * speed,
      vy: ::Math.sin(angle) * speed,
      vz: 80.0 + rand * 60.0,
      r: color[0] / 255.0, g: color[1] / 255.0, b: color[2] / 255.0,
      life: 0.3 + rand * 0.3,
      gravity_scale: 0.5,
      ramp_type: :fire
    )
  end
end

#render(camera: nil) ⇒ Object 



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# File 'lib/quake/renderer/gl_particles.rb', line 74

def render(camera: nil)
  return if @particles.empty?

  upload_particle_texture unless @particle_texture
  view_origin = camera&.position || Math::Vec3::ORIGIN
  view_forward = camera&.forward || Math::Vec3.new(1.0, 0.0, 0.0)
  up = (camera&.up || Math::Vec3.new(0.0, 0.0, 1.0)) * PARTICLE_BILLBOARD_SIZE
  right = (camera&.right || Math::Vec3.new(0.0, -1.0, 0.0)) * PARTICLE_BILLBOARD_SIZE

  GL.Enable(GL::TEXTURE_2D)
  GL.BindTexture(GL::TEXTURE_2D, @particle_texture)
  GL.Disable(GL::ALPHA_TEST)
  GL.Enable(GL::BLEND)
  GL.TexEnvi(GL::TEXTURE_ENV, GL::TEXTURE_ENV_MODE, GL::MODULATE)
  GL.BlendFunc(GL::SRC_ALPHA, GL::ONE_MINUS_SRC_ALPHA)
  GL.DepthMask(GL::FALSE)

  GL.Begin(GL::TRIANGLES)
  @particles.each do |p|
    scale = particle_scale(p, view_origin, view_forward)
    GL.Color3f(p.r, p.g, p.b)
    GL.TexCoord2f(0.0, 0.0)
    GL.Vertex3f(p.x, p.y, p.z)
    GL.TexCoord2f(1.0, 0.0)
    GL.Vertex3f(p.x + up.x * scale, p.y + up.y * scale, p.z + up.z * scale)
    GL.TexCoord2f(0.0, 1.0)
    GL.Vertex3f(p.x + right.x * scale, p.y + right.y * scale, p.z + right.z * scale)
  end
  GL.End

  GL.DepthMask(GL::TRUE)
  GL.Disable(GL::BLEND)
  GL.TexEnvi(GL::TEXTURE_ENV, GL::TEXTURE_ENV_MODE, GL::REPLACE)
  GL.Color3f(1.0, 1.0, 1.0)
end

#rocket_trail(start_pos, end_pos, type:) ⇒ Object

Quake R_RocketTrail: projectile, blood, tracer, and voor trails.



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# File 'lib/quake/renderer/gl_particles.rb', line 139

def rocket_trail(start_pos, end_pos, type:)
  dir_x = end_pos.x - start_pos.x
  dir_y = end_pos.y - start_pos.y
  dir_z = end_pos.z - start_pos.z
  len = ::Math.sqrt(dir_x * dir_x + dir_y * dir_y + dir_z * dir_z)
  return if len.zero?

  dir_x /= len
  dir_y /= len
  dir_z /= len

  dec = 3.0
  if type >= 128
    dec = 1.0
    type -= 128
  end

  x = start_pos.x
  y = start_pos.y
  z = start_pos.z
  while len.positive?
    len -= dec
    emit_rocket_trail_particle(x, y, z, dir_x, dir_y, dir_z, type)
    len -= 3.0 if type == 4
    x += dir_x
    y += dir_y
    z += dir_z
  end
end

#run_particle_effect(pos, color:, count:, dir: nil) ⇒ Object

Quake R_RunParticleEffect: used by gunshots and spike impact puffs.



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# File 'lib/quake/renderer/gl_particles.rb', line 302

def run_particle_effect(pos, color:, count:, dir: nil)
  if count == 1024
    count.times { |i| emit_explosion_particle(pos, index: i) }
    return
  end

  color_base = color & ~7
  dir_x = dir ? dir.x : 0.0
  dir_y = dir ? dir.y : 0.0
  dir_z = dir ? dir.z : 0.0

  count.times do
    color = @palette.rgb(color_base + (rand * 8).to_i)
    emit(
      x: pos.x + (rand * 16).to_i - 8,
      y: pos.y + (rand * 16).to_i - 8,
      z: pos.z + (rand * 16).to_i - 8,
      vx: dir_x * 15.0, vy: dir_y * 15.0, vz: dir_z * 15.0,
      r: color[0] / 255.0, g: color[1] / 255.0, b: color[2] / 255.0,
      life: (rand * 5).to_i * 0.1,
      gravity_scale: 1.0
    )
  end
end

#teleport_splash(pos) ⇒ Object

Teleporter sparkle effect at a position



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# File 'lib/quake/renderer/gl_particles.rb', line 170

def teleport_splash(pos)
  (-16...16).step(4) do |i|
    (-16...16).step(4) do |j|
      (-24...32).step(4) do |k|
        color_idx = 7 + (rand * 8).to_i
        color = @palette.rgb(color_idx)
        dir_x = j * 8.0
        dir_y = i * 8.0
        dir_z = k * 8.0
        length = ::Math.sqrt(dir_x * dir_x + dir_y * dir_y + dir_z * dir_z)
        vel = 50.0 + (rand * 64).to_i
        scale = length.zero? ? 0.0 : vel / length
        emit(
          x: pos.x + i + (rand * 4).to_i,
          y: pos.y + j + (rand * 4).to_i,
          z: pos.z + k + (rand * 4).to_i,
          vx: dir_x * scale,
          vy: dir_y * scale,
          vz: dir_z * scale,
          r: color[0] / 255.0, g: color[1] / 255.0, b: color[2] / 255.0,
          life: 0.2 + (rand * 8).to_i * 0.02,
          gravity_scale: 1.0
        )
      end
    end
  end
end

#update(dt) ⇒ Object 



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# File 'lib/quake/renderer/gl_particles.rb', line 43

def update(dt)
  @particles.reject! do |p|
    p.life -= dt
    next true if p.life <= 0

    # Apply velocity
    p.x += p.vx * dt
    p.y += p.vy * dt
    p.z += p.vz * dt

    # Color ramp animation
    if p.ramp_type && (ramp = ramp_for_type(p.ramp_type))
      p.ramp += dt * ramp_rate(p.ramp_type)
      idx = p.ramp.to_i

      if idx >= ramp_expiry_size(p.ramp_type, ramp)
        next true # particle expired
      end

      color = @palette.rgb(ramp[idx])
      p.r = color[0] / 255.0
      p.g = color[1] / 255.0
      p.b = color[2] / 255.0
    end

    update_velocity(p, dt)

    false
  end
end