Texture Coords to Texel Location

• Want to convert from (s,t) space to (u,v) space.

  • texture coordinates to texel location

• Take fractional part of Texture Coordinate, multiply by 2K, and drop rest of fraction.

  • multiply by 2K is shift to left by K

• Assume a 64 x 32 texture map (26 x 25)

  • Let texture coordinates be (0.5, 0.75)
    • (0000.8000H, 0000.C000H)
  • Texel Coordinates will then be
    • u = 0.8000H << 6 = 0x20 = 32
    • v = 0.C000H << 5 = 0x18 = 24

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