I was trying to use osg::Image::readImageFromCurrentTexture() to read back a
texture from the GPU. The glGetTexImage() call was failing because it was using
an invalid pixel format. The pixel format that it uses comes from calling
osg::Image::computePixelFormat() with the internal format of the texture as
input. In this case my texture's internal format was GL_RGBA8, which
computePixelFormat() incorrectly returns GL_RGBA8. It should return GL_RGBA. I
also tried GL_RGBA16 and had the same experience. Probably just need to add:
case GL_RGBA8:
case GL_RGBA16:
return GL_RGBA;
to the switch statement in computePixelFormat() to fix the problem.
Alex
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