Class: Quake::Renderer::GLWater

Inherits:
Object
  • Object
show all
Includes:
GLWarpSubdivision
Defined in:
lib/quake/renderer/gl_water.rb

Overview

Renders turbulent water/lava/slime surfaces with sine-wave warping. Quake liquid textures have names starting with '*'.

Constant Summary collapse

TURBSCALE =

~40.74

256.0 / (2.0 * ::Math::PI)

Constants included from GLWarpSubdivision

Quake::Renderer::GLWarpSubdivision::SUBDIVIDE_SIZE

Instance Method Summary collapse

Constructor Details

#initialize(level, texture_manager) ⇒ GLWater

Returns a new instance of GLWater.



15
16
17
18
19
20
21
22
23
24
25
26
27
 
# File 'lib/quake/renderer/gl_water.rb', line 15

def initialize(level, texture_manager)
  @level = level
  @texture_manager = texture_manager
  @water_surfaces = []
  @time = 0.0

  # Precompute 256-entry sine table matching Quake's turbsin
  @turbsin = Array.new(256) do |i|
    (::Math.sin(i * 2.0 * ::Math::PI / 256.0) * 8.0)
  end

  precompute_water_surfaces
end

Instance Method Details

#render(alpha: 1.0) ⇒ Object

Render water surfaces with turbulent sine-wave warp. alpha: 1.0 = fully opaque (GLQuake default r_wateralpha). Values < 1.0 enable semi-transparent water.



36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
 
# File 'lib/quake/renderer/gl_water.rb', line 36

def render(alpha: 1.0)
  return if @water_surfaces.empty?

  GL.Enable(GL::TEXTURE_2D)

  if alpha < 1.0
    GL.Enable(GL::BLEND)
    GL.BlendFunc(GL::SRC_ALPHA, GL::ONE_MINUS_SRC_ALPHA)
    GL.TexEnvi(GL::TEXTURE_ENV, GL::TEXTURE_ENV_MODE, GL::MODULATE)
    GL.Color4f(1.0, 1.0, 1.0, alpha)
  else
    GL.TexEnvi(GL::TEXTURE_ENV, GL::TEXTURE_ENV_MODE, GL::REPLACE)
  end

  @water_surfaces.each do |ws|
    @texture_manager.bind(ws[:miptex_index])

    ws[:faces].each do |face_data|
      GL.Begin(GL::TRIANGLE_FAN)
      face_data[:verts].each_with_index do |v, i|
        os, ot = face_data[:texcoords][i]

        # Cross-modulated sine warp
        s = os + @turbsin[((ot * 0.125 + @time) * TURBSCALE).to_i & 255]
        s /= 64.0

        t = ot + @turbsin[((os * 0.125 + @time) * TURBSCALE).to_i & 255]
        t /= 64.0

        GL.TexCoord2f(s, t)
        GL.Vertex3f(v.x, v.y, v.z)
      end
      GL.End
    end
  end

  if alpha < 1.0
    GL.Disable(GL::BLEND)
    GL.Color4f(1.0, 1.0, 1.0, 1.0)
  end
  GL.TexEnvi(GL::TEXTURE_ENV, GL::TEXTURE_ENV_MODE, GL::MODULATE)
end

#update(dt) ⇒ Object 



29
30
31
 
# File 'lib/quake/renderer/gl_water.rb', line 29

def update(dt)
  @time += dt
end