PDA

View Full Version : Can EGLImageTargetTexture2DOES specify mip level to target?



xynopsis
11-30-2012, 07:41 AM
Hi,

I'm a bit confused about the wording of OES_EGL_image spec :




The command

void EGLImageTargetTexture2DOES(enum target, eglImageOES image);

defines an entire two-dimensional texture array...
Any existing image arrays associated with any mipmap levels in the texture
object are freed (as if TexImage was called for each, with an image of
zero size).



The context for this question is that I want to bring back the existing mipmap levels stored in a sibling EGLImage using the KHR_gl_texture_2D_image extension aside from the level specified in the <image> parameter of the function in question.

But as the spec says above, any existing bound mip levels are cleared???

Or is my understanding of the spec wrong? Is this even allowed at all?



glBindTexture(GL_TEXTURE_2D, textureId);
glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, level0);
glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, level1);
glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, level2);


where level[n] are EGLImages containing the levels of the texture

Thanks,