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Thread: Geforce 4: No GL_EXT_blend_func_separate ??

  1. #1
    Senior Member OpenGL Guru
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    Geforce 4: No GL_EXT_blend_func_separate ??

    I just read about that extension and thought "damn, thatīs what you need"!
    But when i check the extension string, this extension does not show up! On a Geforce 4200 with 45.23 drivers.
    Why? I could really use that extension. Which cards do support it?
    I always thought this extension is quite old and should be implemented in all cards, but certainly i am wrong.

    I am disappointed.
    Jan.
    GLIM - Immediate Mode Emulation for GL3

  2. #2
    Senior Member OpenGL Guru
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    Re: Geforce 4: No GL_EXT_blend_func_separate ??

    BlendFuncSeparate is a part of the core (maybe the imaging subset, not sure).

  3. #3
    Senior Member Frequent Contributor
    Join Date
    Apr 2003
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    680

    Re: Geforce 4: No GL_EXT_blend_func_separate ??

    this extension is not hardware accelerated on gf4 ti, I tried it too and this was the sad result. I worked around it with using opacity weighted colors and blend func GL_ONE, GL_ONE_MINUS_SRC_ALPHA (I need the color values blended, but the alpha values added, for rendering my cloud impostor textures with destination alpha).

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