Class: Quake::Renderer::GLLightmap

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

Overview

Computes and uploads lightmaps for BSP faces. Each face's lightmap is a small texture (typically 4x4 to 18x18) derived from the lighting lump. Lightmap UVs are computed from the face's texture-space extents, quantized to a 16-unit grid.

Defined Under Namespace

Classes: LightmapInfo

Constant Summary collapse

LIGHTMAP_BLOCK_WIDTH = 
128
LIGHTMAP_BLOCK_HEIGHT = 
128
MAX_LIGHTSTYLES = 
64
DEFAULT_LIGHTSTYLES = 
{
  0 => "m",
  1 => "mmnmmommommnonmmonqnmmo",
  2 => "abcdefghijklmnopqrstuvwxyzyxwvutsrqponmlkjihgfedcba",
  3 => "mmmmmaaaaammmmmaaaaaabcdefgabcdefg",
  4 => "mamamamamama",
  5 => "jklmnopqrstuvwxyzyxwvutsrqponmlkj",
  6 => "nmonqnmomnmomomno",
  7 => "mmmaaaabcdefgmmmmaaaammmaamm",
  8 => "mmmaaammmaaammmabcdefaaaammmmabcdefmmmaaaa",
  9 => "aaaaaaaazzzzzzzz",
  10 => "mmamammmmammamamaaamammma",
  11 => "abcdefghijklmnopqrrqponmlkjihgfedcba",
  63 => "a"
}.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(level, palette, lightstyles: nil) ⇒ GLLightmap

Returns a new instance of GLLightmap.



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# File 'lib/quake/renderer/gl_lightmap.rb', line 35

def initialize(level, palette, lightstyles: nil)
  @level = level
  @palette = palette
  @face_lightmaps = {}
  @block_textures = []    # GL texture ids for each block
  @block_allocated = []   # row allocation per block column
  @block_pixels = []      # RGBA pixel data per block
  @face_lightmap_faces = {}
  @uploaded = false
  @lightstyles = self.class.default_lightstyles
  Array(lightstyles).each_with_index { |map, style| @lightstyles[style] = map if map }
  animate_lightstyles(0.0)
end

Instance Attribute Details

#face_lightmaps ⇒ Object (readonly)

face_index -> LightmapInfo



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# File 'lib/quake/renderer/gl_lightmap.rb', line 33

def face_lightmaps
  @face_lightmaps
end

#lightstyle_values ⇒ Object (readonly)

face_index -> LightmapInfo



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# File 'lib/quake/renderer/gl_lightmap.rb', line 33

def lightstyle_values
  @lightstyle_values
end

Class Method Details

.default_lightstyles ⇒ Object 



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# File 'lib/quake/renderer/gl_lightmap.rb', line 49

def self.default_lightstyles
  Array.new(MAX_LIGHTSTYLES) { |style| DEFAULT_LIGHTSTYLES[style] }
end

.lightstyle_values_for(time, lightstyles) ⇒ Object 



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# File 'lib/quake/renderer/gl_lightmap.rb', line 53

def self.lightstyle_values_for(time, lightstyles)
  frame = (time.to_f * 10.0).to_i
  values = Array.new(MAX_LIGHTSTYLES, 256)
  MAX_LIGHTSTYLES.times do |style|
    map = lightstyles[style]
    next if map.nil? || map.empty?

    values[style] = (map.getbyte(frame % map.length) - "a".ord) * 22
  end
  values
end

Instance Method Details

#animate_lightstyles(time) ⇒ Object 



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# File 'lib/quake/renderer/gl_lightmap.rb', line 75

def animate_lightstyles(time)
  @lightstyle_values = self.class.lightstyle_values_for(time, @lightstyles)
  @lightstyle_values
end

#bind(face_index) ⇒ Object 



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# File 'lib/quake/renderer/gl_lightmap.rb', line 132

def bind(face_index)
  info = @face_lightmaps[face_index]
  return unless info
  GL.BindTexture(GL::TEXTURE_2D, info.gl_texture)
end

#build_all ⇒ Object 



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

def build_all
  animate_lightstyles(0.0) unless @lightstyle_values
  allocate_block

  @level.faces.each_with_index do |face, face_index|
    texinfo = @level.texinfo[face.texinfo_index]
    next if texinfo.nil?
    next if texinfo.flags & 1 != 0 # TEX_SPECIAL (sky/turb)
    # Faces with no samples (light_offset < 0) still get a lightmap: all
    # zeros renders them black, matching R_BuildLightMap. Only a missing
    # lighting lump means fullbright.
    next if @level.lighting.nil? || @level.lighting.empty?

    build_face_lightmap(face, face_index)
  end

  upload_blocks
  count = @face_lightmaps.size
  puts "Built #{count} lightmaps in #{@block_textures.size} blocks"
end

#lightmap_texcoords(face_index, vertex, texinfo) ⇒ Object

Compute lightmap UVs for a vertex given the face's lightmap info.



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

def lightmap_texcoords(face_index, vertex, texinfo)
  info = @face_lightmaps[face_index]
  return [0.0, 0.0] unless info

  # Compute texture-space coordinate
  s = vertex.dot(texinfo.s_vec) + texinfo.s_offset
  t = vertex.dot(texinfo.t_vec) + texinfo.t_offset

  # Convert to lightmap UV: subtract texture mins, scale by 1/16.
  # The half-luxel centering is applied once, as the +0.5 texel below
  # (C adds +8 texture units before the /16 -- same thing).
  extents = face_extents(face_index)
  return [0.0, 0.0] unless extents

  tex_mins_s, tex_mins_t, _, _ = extents

  ls = (s - tex_mins_s) / (info.width * 16.0)
  lt = (t - tex_mins_t) / (info.height * 16.0)

  # Map into atlas block coordinates
  atlas_s = (info.s_offset + ls * info.width + 0.5) / LIGHTMAP_BLOCK_WIDTH
  atlas_t = (info.t_offset + lt * info.height + 0.5) / LIGHTMAP_BLOCK_HEIGHT

  [atlas_s, atlas_t]
end

#lightstyles=(lightstyles) ⇒ Object 



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# File 'lib/quake/renderer/gl_lightmap.rb', line 65

def lightstyles=(lightstyles)
  Array(lightstyles).each_with_index { |map, style| @lightstyles[style] = map if style < MAX_LIGHTSTYLES }
end

#set_lightstyle(style, map) ⇒ Object 



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# File 'lib/quake/renderer/gl_lightmap.rb', line 69

def set_lightstyle(style, map)
  return if style.negative? || style >= MAX_LIGHTSTYLES

  @lightstyles[style] = map
end

#update(time, lightstyles: nil, dynamic_lights: nil) ⇒ Object 



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# File 'lib/quake/renderer/gl_lightmap.rb', line 80

def update(time, lightstyles: nil, dynamic_lights: nil)
  self.lightstyles = lightstyles if lightstyles
  old_values = @lightstyle_values || Array.new(MAX_LIGHTSTYLES, 256)
  new_values = animate_lightstyles(time)
  changed_styles = (0...MAX_LIGHTSTYLES).select { |style| old_values[style] != new_values[style] }

  # R_MarkLights: faces touched by dynamic lights this frame, plus faces
  # lit last frame (which must be re-baked back to their static light).
  dlit_faces = mark_dynamic_faces(Array(dynamic_lights))
  previously_dlit = @dlit_faces || {}
  @dlit_faces = dlit_faces
  return false if changed_styles.empty? && dlit_faces.empty? && previously_dlit.empty?

  changed_blocks = {}
  @face_lightmap_faces.each do |face_index, face|
    lights = dlit_faces[face_index]
    needs_rebake = lights ||
                   previously_dlit.key?(face_index) ||
                   (!changed_styles.empty? && face_uses_styles?(face, changed_styles))
    next unless needs_rebake

    info = @face_lightmaps[face_index]
    next unless info

    write_face_lightmap(face, info, face_index: face_index, dlights: lights)
    changed_blocks[info.block_index] = true
  end
  upload_changed_blocks(changed_blocks.keys) if @uploaded
  !changed_blocks.empty?
end