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Type: Posts; User: phdr_hroch

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    Post processing

    Hi I want to post process image, and redraw specified color to different color (clearing alpha channel is enough). Exists something like glColorFunc(GL_EQUAL) ?? Is there non shader solution ?...
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    1,737

    Thank you, I found another solution: I solved...

    Thank you, I found another solution:

    I solved it now by using background with 0.0f alpha channel and glBlendFunc GL_ONE_MINUS_DST_ALPHA, GL_DST_ALPHA and changed draw order.
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    Transparency without background

    Hi my problem:
    I dont know what background will have result image of my transparent rendering.
    glBlendFunc((GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) world fine with known background. But I cant render...
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    thx, I missed that, but I really want to know the...

    thx, I missed that, but I really want to know the answer to first question:
    Does glReadPixels in one thread stalls gl* operations on another thread if a have two contexts ?
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    Two contexts - glReadPixels

    Hi I have OpenGL rendering server that sends rendered images based on request. Basic princip is simple: 1) get request 2) render to texture(pbuffer or fbo), call glReadPixels 3) send image.
    ...
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    geometry shader line draw function: // make...

    geometry shader line draw function:
    // make thick line
    // from : transformed point (by modelviewprojectionmatrix)
    // to : trasformed point
    // colorfrom : first point color
    // colorto : second...
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    876 in 45 degrees rotation the line (created by...

    876
    in 45 degrees rotation the line (created by two triangles) is 2px wide instead of 1px
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    1px line using triangles

    Hi,
    I have geometry (or fallback vertex only) shader, that generates lines with custom width and pass float uniform into shader.
    For lines that are more than 1px thick, it works great. But if I...
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    I can construct buffer anyway I want to. Thanks...

    I can construct buffer anyway I want to.
    Thanks for answers
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    4,206

    array od size 30k+ and not bigger than 500 000.

    array od size 30k+ and not bigger than 500 000.
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    Combining Points into one VBO

    hi in my app, I've got many points. If I want to speedup rendering, the fastest way seems combining them together into one VBO (one vertex array for multiple points) and then draw them with one call....
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