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Type: Posts; User: James Lohr

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  1. Replies
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    OpenGL ES 2.0 - Life without push/pop

    Hello,

    I'm really struggling to grasp the thinking behind OpenGL ES 2.0, and the lack of immediate mode and push/pop matrix.

    Usually, when rendering a scene in OpenGL I would do something like...
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    Re: Orthog params from Projection Matrix

    Nevermind, I managed to work it out myself:

    Matrix4 matrix = new Matrix4();
    GL.GetFloat(GetPName.ProjectionMatrix, out matrix.Row0.X);

    float left = - (1f...
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    Orthog params from Projection Matrix

    Hello,

    Suppose I set an orthog projection :

    GL.Ortho(0, 800, 800, 0, -1, 100);

    I can then read back the projection matrix using:

    GL.GetFloat(GetPName.ProjectionMatrix,...);
  4. Re: Intel HD Graphics - no OpenGL Extension support?

    Woot! The fresh install did the trick. Full support up to 2.1, and 70% at 3.0.
  5. Re: Intel HD Graphics - no OpenGL Extension support?

    Well, I'm going to have one last-ditch attempt: I'm going to pop to the shops now to buy a 4gb USB stick so that I can reinstall Windows 7. I will then attempt to freshly install the intel drivers,...
  6. Re: Intel HD Graphics - no OpenGL Extension support?

    I've wasted a whole day trying to get this to work now, and I've come to the conclusion that Intel HD + my current chipset simply does not support OpenGL properly. Everything indicates that the...
  7. Re: Intel HD Graphics - no OpenGL Extension support?

    I'm running windows 7, 64 bit.

    I'm running OpenGL extension viewer. It says I only have OpenGL 1.1 supported.

    I've installed the latest drivers from Intel in 3 separate different ways, all...
  8. Intel HD Graphics - no OpenGL Extension support?

    Hello, I just bought a brand new Sony VAIO VPCY21S1E laptop with an Intel HD Graphics card, however the machine is nearly totally useless to me because it does not appear to support basic OpenGL...
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    Re: NPOTs - support / limitations etc.

    Thanks very much Jan. Unfortunately texture_non_power_of_two.txt doesn't really talk about performance.

    As a bit of background, let me explain my reasoning for wanting NPOTs: the game I'm...
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    Re: NPOTs - support / limitations etc.

    <quote>The main reason to still keep an eye on POT dimensions is performance. NPOT textures are a bit slower, because the GPU needs to do more computations.</quote>

    How much slower? Also, when...
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    NPOTs - support / limitations etc.

    In the past I used to pack my textures into POTs, however I'm told that this is fairly redundant with NPOTs supported by most cards.

    So, what exactly are the limitations of NPOTs? - I know they...
  12. Re: Writing to target alpha without changing colour

    Heh, I could have sworn that existed, however after 15 minutes of googling for "opengl colour mask" and not finding it, I concluded that I was imagining things and it didn't actually exist. I blame...
  13. Writing to target alpha without changing colour

    I have a texture that is a render target which has an alpha channel. I'm trying to get an effect where objects leave a trail when drawn. The idea would be to render to a texture T, and then, instead...
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    Silhouette style texturing

    Here's what I would like to do:

    I have some texture which has an alpha layer. Let's, for argument's sake, say that it is an image of a tree with backround having an alpha value of 0.

    Firstly,...
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