Sub-pixelScreen Door Transparency

Multisample masking



• SGIS_multisample extension supports multiple color samples per pixel
  • SGI high-end only feature for antialiasing
• glSampleMaskSGIS specifies a multisample sub-pixel screen door pattern
  • enabled via glEnable(GL_SAMPLE_MASK_SGIS)
• Because sub-pixel, stipple pattern is not visible
• Limited number of samples (4 or 8 typical)

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