Class: Quake::Renderer::GLAliasModel

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

Overview

Renders Quake MDL (alias) models with texture mapping and frame animation.

Constant Summary collapse

ANORMS =

Quake’s pre-computed normal table (162 normals for lighting) Simplified to just the first few key directions for now

nil

Instance Method Summary collapse

Constructor Details

#initialize(model, palette) ⇒ GLAliasModel

Full table would be loaded from anorms.h



13
14
15
16
17
18
 
# File 'lib/quake/renderer/gl_alias_model.rb', line 13

def initialize(model, palette)
  @model = model
  @palette = palette
  @skin_textures = []
  upload_skins
end

Instance Method Details

#frame_count ⇒ Object 



83
84
85
 
# File 'lib/quake/renderer/gl_alias_model.rb', line 83

def frame_count
  @model.frames.size
end

#render(frame_index:, lerp: 0.0, position: Math::Vec3::ORIGIN, yaw: 0.0, pitch: 0.0, scale: 1.0) ⇒ Object

Render the model at a given frame (interpolation between two frames). frame_index: current frame number lerp: 0.0-1.0 interpolation factor to next frame position: Vec3 world position yaw: rotation angle in degrees



25
26
27
28
29
30
31
32
33
34
35
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
78
79
80
81
 
# File 'lib/quake/renderer/gl_alias_model.rb', line 25

def render(frame_index:, lerp: 0.0, position: Math::Vec3::ORIGIN, yaw: 0.0, pitch: 0.0, scale: 1.0)
  frame = resolve_frame(frame_index)
  next_frame = resolve_frame(frame_index + 1)

  GL.PushMatrix
  GL.Translatef(position.x, position.y, position.z)
  GL.Rotatef(yaw, 0.0, 0.0, 1.0)
  GL.Rotatef(pitch, 0.0, 1.0, 0.0)

  GL.Enable(GL::TEXTURE_2D)
  GL.BindTexture(GL::TEXTURE_2D, @skin_textures[0]) if @skin_textures.any?

  GL.Begin(GL::TRIANGLES)
  @model.triangles.each do |tri|
    tri.vertex_indices.each_with_index do |vi, _ti|
      # Texture coordinates
      stvert = @model.stverts[vi]
      s = stvert.s.to_f
      t = stvert.t.to_f

      # Adjust seam UVs for back-facing triangles
      if stvert.on_seam != 0 && tri.faces_front == 0
        s += @model.skin_width * 0.5
      end

      s = (s + 0.5) / @model.skin_width
      t = (t + 0.5) / @model.skin_height
      GL.TexCoord2f(s, t)

      # Decompress vertex position
      v1 = frame.vertices[vi]
      x1 = v1.x * @model.scale.x + @model.scale_origin.x
      y1 = v1.y * @model.scale.y + @model.scale_origin.y
      z1 = v1.z * @model.scale.z + @model.scale_origin.z

      if lerp > 0.0 && next_frame
        v2 = next_frame.vertices[vi]
        x2 = v2.x * @model.scale.x + @model.scale_origin.x
        y2 = v2.y * @model.scale.y + @model.scale_origin.y
        z2 = v2.z * @model.scale.z + @model.scale_origin.z

        x = x1 + (x2 - x1) * lerp
        y = y1 + (y2 - y1) * lerp
        z = z1 + (z2 - z1) * lerp
      else
        x = x1
        y = y1
        z = z1
      end

      GL.Vertex3f(x * scale, y * scale, z * scale)
    end
  end
  GL.End

  GL.PopMatrix
end