🔒 Locked

Depth Component

Started by ruzhenchao Apr 17, 2009 at 3:08 AM 1 reply 750+ views

Original Post

Apr 17, 2009 at 3:08 AM

Recently, I was writing code about texture using OpenGL API. there are two parameters that doubt me in the function glTexImage* they are format(image format) and type(image type) if the format is GL_RGB and the type is GL_UNSIGNED_BYTE then a pixel has red,green,blue component and each component is 8 bits, if the type is GL_UNSIGNED_SHORT then each component is 16 bits. Yes It's obvious! The question is how many bits in a pixel if the format is GL_DEPTH_COMPONENT and the type is GL_UNSIGNED_BYTE and what about GL_UNSIGNED_SHORT?

dpadam450

523

dpadam450

Apr 18, 2009 at 1:59 PM

When you create your depth buffer, how many bits did you request? I think depth component will just match that.

Promit

Mod

1,082

Promit

Apr 18, 2009 at 2:40 PM

Quote:
Original post by ruzhenchao
The question is how many bits in a pixel if the format is GL_DEPTH_COMPONENT and the type is GL_UNSIGNED_BYTE and what about GL_UNSIGNED_SHORT?

According to the docs:

Quote:
GL_DEPTH_COMPONENT
Each element is a single depth component. It is converted to floating-point, then multiplied by the signed scale factor GL_DEPTH_SCALE, added to the signed bias GL_DEPTH_BIAS, and clamped to the range [0, 1] (see glPixelTransfer).

So if you use GL_UNSIGNED_BYTE, each pixel is 8 bits. 16 if SHORT, 32 if INT.

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.