Class: RBGL::Engine::Framebuffer

Inherits:
Object
  • Object
show all
Defined in:
lib/rbgl/engine/framebuffer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(width, height) ⇒ Framebuffer

Returns a new instance of Framebuffer.



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# File 'lib/rbgl/engine/framebuffer.rb', line 8

def initialize(width, height)
  @width = width
  @height = height
  @color_buffer = Array.new(width * height) { Larb::Color.black }
  @depth_buffer = Array.new(width * height) { Float::INFINITY }
end

Instance Attribute Details

#color_buffer ⇒ Object (readonly)

Returns the value of attribute color_buffer.



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# File 'lib/rbgl/engine/framebuffer.rb', line 6

def color_buffer
  @color_buffer
end

#depth_buffer ⇒ Object (readonly)

Returns the value of attribute depth_buffer.



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# File 'lib/rbgl/engine/framebuffer.rb', line 6

def depth_buffer
  @depth_buffer
end

#height ⇒ Object (readonly)

Returns the value of attribute height.



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# File 'lib/rbgl/engine/framebuffer.rb', line 6

def height
  @height
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/rbgl/engine/framebuffer.rb', line 6

def width
  @width
end

Instance Method Details

#clear(color: Larb::Color.black, depth: Float::INFINITY) ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 57

def clear(color: Larb::Color.black, depth: Float::INFINITY)
  @color_buffer.fill(color)
  @depth_buffer.fill(depth)
end

#clear_color(color) ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 62

def clear_color(color)
  @color_buffer.fill(color)
end

#clear_depth(depth = Float::INFINITY) ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 66

def clear_depth(depth = Float::INFINITY)
  @depth_buffer.fill(depth)
end

#get_depth(x, y) ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 34

def get_depth(x, y)
  return Float::INFINITY if x < 0 || x >= @width || y < 0 || y >= @height

  @depth_buffer[y * @width + x]
end

#get_pixel(x, y) ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 22

def get_pixel(x, y)
  return nil if x < 0 || x >= @width || y < 0 || y >= @height

  @color_buffer[y * @width + x]
end

#resize(width, height) ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 15

def resize(width, height)
  @width = width
  @height = height
  @color_buffer = Array.new(width * height) { Larb::Color.black }
  @depth_buffer = Array.new(width * height) { Float::INFINITY }
end

#set_depth(x, y, depth) ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 40

def set_depth(x, y, depth)
  return if x < 0 || x >= @width || y < 0 || y >= @height

  @depth_buffer[y * @width + x] = depth
end

#set_pixel(x, y, color) ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 28

def set_pixel(x, y, color)
  return if x < 0 || x >= @width || y < 0 || y >= @height

  @color_buffer[y * @width + x] = color
end

#to_bgra_bytes ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 93

def to_bgra_bytes
  packed_color_bytes(i[b g r a])
end

#to_ppm ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 70

def to_ppm
  ppm = "P3\n#{@width} #{@height}\n255\n"
  @height.times do |y|
    row = @width.times.map do |x|
      c = @color_buffer[y * @width + x]
      bytes = c.to_bytes
      "#{bytes[0]} #{bytes[1]} #{bytes[2]}"
    end
    ppm += row.join(" ") + "\n"
  end
  ppm
end

#to_ppm_binary ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 83

def to_ppm_binary
  header = "P6\n#{@width} #{@height}\n255\n"
  pixels = packed_color_bytes(i[r g b])
  header + pixels
end

#to_rgba_bytes ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 89

def to_rgba_bytes
  packed_color_bytes(i[r g b a])
end

#write_pixel(x, y, color, depth, depth_test: true, depth_write: true, blend_mode: :none) ⇒ Object 



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# File 'lib/rbgl/engine/framebuffer.rb', line 46

def write_pixel(x, y, color, depth, depth_test: true, depth_write: true, blend_mode: :none)
  return false if x < 0 || x >= @width || y < 0 || y >= @height

  idx = y * @width + x
  return false if depth_test && depth >= @depth_buffer[idx]

  @color_buffer[idx] = blend_color(@color_buffer[idx], color, blend_mode)
  @depth_buffer[idx] = depth if depth_write
  true
end