OpenGL C#, loading textures in upside down

Is there a way to load images into openGL with the y-coords flipped? (upside down). I'm using the .NET Bitmap and BitmapData classes, a开发者_Python百科nd passing BitmapData.Scan0 to OpenGL.

Flipping the Bitmap on the CPU using .RotateFlip() is too slow.

Aside from flipping all of the texcoords, can I solve this problem in our engine?

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If you render using a fragment shader, you get to interpret the u, v coordinates anyway you want. Turning them upside down should be trivial and (nearly) free.

Other than that, just flip your texture coordinates. It should not be difficult to achieve this.

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You should be able to just alter your texture coordinates to achieve the desired flip.

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I think the answer is no. OpenGl takes a pointer to an image as texture data, and I never seen any way to tell him to flip the lines.

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(edit: Disregard, question is textures instead of DrawPixels)

This worked for me in C++.

Q: "How can I make glDrawPixels() draw an image flipped upside down?"

A: "Try glPixelZoom( 1.0, -1.0 ). Similarly, an image can be flipped left to right with glPixelZoom(). Note that you may have to adjust your raster position to position the image correctly."

src: http://www.mesa3d.org/brianp/sig97/gotchas.htm