24. Most Common Blend Method

• Enabled by

  
      glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
  
  

• Take source and multiply rgb (colors) by its alpha value

• Take destination and multiply rgb by (1-source alpha)

• Blending calculation example:

  
      Cd = ( 1.0f, 0.0f, 0.0f, 1.0f )     // Red
      Cs = ( 0.0f, 0.0f, 1.0f, 0.6f )     // Blue, with source alpha 0.6
       D = 1.0f – 0.6 == 0.4f
      Cf = ( Blue * 0.6 ) + ( Red * 0.4 )