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Type: Posts; User: sdrouin

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  1. Replies
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    Content of a depth texture

    I'm copying the depth buffer to a floating point texture like this:

    glBindTexture( id )...
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    world to pixel size in vertex shader

    What is the most efficient way to compute, in a vertex shader, the screen size (in pixels) of sphere of radius 1 centered on the current vertex?

    I need to apply a transform on vertices based on...
  3. Thread: Compositing

    by sdrouin
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    Compositing

    I want to do the following:

    1. Render multiple semi-transparent primitives to a texture using a framebuffer object.
    2. Composite the texture on top of the content of the main framebuffer (screen)...
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    Framebuffer objects performance

    I have to draw to different textures and render buffers for every frame of my application. What is faster:

    1 - Having one framebuffer object and regularly changing the attached texture.

    OR

    2...
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    Re: glBlitFramebuffer(EXT) coordinates

    After many tests (different graphics card and different driver versions), it appears that the a blit between a multisampled render buffer and the non-multisampled on-screen buffer is buggy with all...
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    Re: glBlitFramebuffer(EXT) coordinates

    You where right. The content of the render buffer is flipped upside down.

    This render buffer has multisample storage. The interesting thing is that if I set the number of samples to 0, the render...
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    Re: glBlitFramebuffer(EXT) coordinates

    GeForce 8800GT, winXP, OpenGL 3.2. I updated the driver this week, so I should have the latest version ( driver date: 27-09-2009, driver version: 6.14.11.9107 ).

    It could be the case that the...
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    glBlitFramebuffer(EXT) coordinates

    Is there any opengl state that affects coordinates used in a blit operation?

    I use glBlitFrameBuffer to copy the upper half of an offscreen render buffer to the upper half of a window's back...
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    Render to texture and multisampling

    Is it possible to render to a texture using a frame buffer object and get multisampling? If so, any sample code available?

    Thanks in advance.

    s.
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