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Getting pixel data from a texture object.

Started by cowsarenotevil Sep 4, 2003 at 10:37 PM 4 replies 450+ views

Original Post

Sep 4, 2003 at 10:37 PM

Don''t you hate that sudden feeling of retardation that you get when you realize that you don''t know something that you probably should? Anyway, I''m sure there''s a relatively easy way of doing this, but what is it?

MazyNoc

Sep 5, 2003 at 3:45 AM

glGetTexImage is what youre looking for..

I think you must get the width/height and other properties first.. but those are glGet* as well

Then I dont see the use of it

if you have uploaded the image, you can keep a copy in system mem ( get is suer to be much slower than upload it), or if its a realtime created texture it probably was rendertarget at some point and then a glReadPixels would work ( and thats slow to, but i think its more demands on making that fast, and reliable than glGetTexImage )

cowsarenotevil

Sep 5, 2003 at 12:42 PM

Actually, I was planning on rendering to a texture and then getting the coordinates from the texture. Now that you mention it, there''s probably a better way, but oh well.

cowsarenotevil

Sep 5, 2003 at 3:23 PM

Ok, if format is GL_RBG, type is GL_FLOAT, and pixels is a pointer to an array of GL_FLOATs, how will the data be stored? The MSDN doesn't really explain it.

EDIT: Shameless edit-bump

EDIT: Again
EDIT: I think I might sctually have it figured out, never mind.

[edited by - cowsarenotevil on September 6, 2003 10:16:40 AM]

MazyNoc

Sep 8, 2003 at 3:43 AM

you didnt say if it was the glTexImage2d or glGetTexImage that youre calling with those values.

cowsarenotevil

Sep 8, 2003 at 7:36 PM

It''s a 2D texture.

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