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GR32_Blend

EMMS

procedure EMMS;

Description

Calls to blending functions must be followed by EMMS procedure. This restores the state of FPU flags, altered by MMX instructions. When CPU does not support MMX, the EMMS function does nothing.

This function must be called after Blend, BlendEx or Combine calls, otherwise CPU will not be able to execute floating point instructions.

If you are using color algebra (such as ColorAdd, ColorMax etc.) that use MMX internally you also have to make sure that EMMS is called.

A typical example of using blending functions:

try   for i := X1 to X2 do
  begin
    BlendMem(Clr32, P^); // This function uses MMX
    Inc(P);
  end;
finally
   EMMS; // EMMS is called only once, since there is no FPU code inside the loop
end;

See Also

Blend, BlendEx, ColorAdd, ColorMax, Combine

Copyright ©2000-2007 Alex Denisov and Contributors   -   Graphics32 v1.8.3   -   Build on 4-March-2007