texture

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This extension introduces the notion of an internal image format whether it be destined for texture memory or the framebuffer. Also, a new texture function, GL_REPLACE_EXT, is defined.

• In addition to extending alpha, luminance/alpha, rgb and rgba image types to include internal component bit sizes, this extensions adds a new type: intensity.
  
  
• Tuning Tip:
  When applicable, use luminance and intensity internal formats in imaging functions (color_table, histogram) to reduce redundant calculations on multiple components.