Module: Glslkit::WebGL::Matrix

Defined in:
lib/glslkit/webgl/matrix.rb

Class Method Summary collapse

Class Method Details

.identity!(out) ⇒ Object 



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# File 'lib/glslkit/webgl/matrix.rb', line 8

def identity!(out)
  16.times { |i| out[i] = 0.0 }
  out[0] = out[5] = out[10] = out[15] = 1.0
  out
end

.multiply!(out, left, right) ⇒ Object 



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# File 'lib/glslkit/webgl/matrix.rb', line 44

def multiply!(out, left, right)
  4.times do |column|
    offset = column * 4
    r0 = right[offset].to_f
    r1 = right[offset + 1].to_f
    r2 = right[offset + 2].to_f
    r3 = right[offset + 3].to_f
    out[offset] = left[0].to_f * r0 + left[4].to_f * r1 + left[8].to_f * r2 + left[12].to_f * r3
    out[offset + 1] = left[1].to_f * r0 + left[5].to_f * r1 + left[9].to_f * r2 + left[13].to_f * r3
    out[offset + 2] = left[2].to_f * r0 + left[6].to_f * r1 + left[10].to_f * r2 + left[14].to_f * r3
    out[offset + 3] = left[3].to_f * r0 + left[7].to_f * r1 + left[11].to_f * r2 + left[15].to_f * r3
  end
  out
end

.perspective!(out, fovy, aspect, near, far) ⇒ Object 



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# File 'lib/glslkit/webgl/matrix.rb', line 59

def perspective!(out, fovy, aspect, near, far)
  f = 1.0 / Math.tan(fovy / 2.0)
  16.times { |i| out[i] = 0.0 }
  out[0] = f / aspect
  out[5] = f
  out[11] = -1.0
  if far
    nf = 1.0 / (near - far)
    out[10] = (far + near) * nf
    out[14] = 2.0 * far * near * nf
  else
    out[10] = -1.0
    out[14] = -2.0 * near
  end
  out
end

.rotation_y!(out, radians) ⇒ Object 



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# File 'lib/glslkit/webgl/matrix.rb', line 25

def rotation_y!(out, radians)
  cosine = Math.cos(radians)
  sine = Math.sin(radians)
  identity!(out)
  out[0] = cosine
  out[2] = -sine
  out[8] = sine
  out[10] = cosine
  out
end

.rotation_z!(out, radians) ⇒ Object 



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# File 'lib/glslkit/webgl/matrix.rb', line 14

def rotation_z!(out, radians)
  cosine = Math.cos(radians)
  sine = Math.sin(radians)
  identity!(out)
  out[0] = cosine
  out[1] = sine
  out[4] = -sine
  out[5] = cosine
  out
end

.translation!(out, x, y, z) ⇒ Object 



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# File 'lib/glslkit/webgl/matrix.rb', line 36

def translation!(out, x, y, z)
  identity!(out)
  out[12] = x
  out[13] = y
  out[14] = z
  out
end