On Thu, Jul 15, 2010 at 11:43 AM, Ulrich Hertlein <[email protected]>wrote:
> On 15/07/10 1:36 , Jason Daly wrote: > >> > >> I'm trying to create a 1-bit texture, like this: > >> > >> int internalFormat = GL_RED; > >> int pixelFormat = GL_RED; > >> int dataType = GL_BITMAP; > >> > >> I get the following error when running this code: > >> Warning: detected OpenGL error 'invalid enumerant' after > RenderBin::draw(,) > >>... > > > > GL_BITMAP is not valid for a texture data type. The smallest data type > allowed, as you've > > already discovered, is GL_UNSIGNED_BYTE. > > So that is a limitation of osg::Image? Because glTexImage2D() supports it. > (Or at least it did once, I have never used it and was quite surprised to > find it in the > man page.) GL_BITMAP is a valid texture type and supported by osg::Image, but only if the pixel format is GL_COLOR_INDEX. That is not likely to be optimal on today's hardware. If the texture memory usage is really a problem, you could do a trick in the fragment shader where you use an isampler to do the texture lookup and use the s coordinate to bit shift and mask the value in the 8 bit texel. You would need to scale your texture coordinates accordingly. Tim
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