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Texture buffer or frame buffer?

Started by mlt Dec 20, 2008 at 11:22 AM 2 replies 400+ views

Original Post

Dec 20, 2008 at 11:22 AM

In the red bible I can only find documentation about a framebuffer. But I have also heard that there is something called a texture buffer, what are the difference between a frame buffer and a texture buffer? I need to render a frame to a texture so I assume that I need the texture buffer and not the frame buffer. Are there any tutorials around regarding how to write a frame to a texture?

V-man

163

V-man

Dec 20, 2008 at 11:36 AM

Yes, there is one here on gamedev.net....somewhere

there is also sample code here
http://www.opengl.org/wiki/index.php/GL_EXT_framebuffer_object

mlt

Author

mlt

Dec 21, 2008 at 2:18 AM

Thanks, but are there any difference between a texture buffer and a framebuffer?

V-man

163

V-man

Dec 21, 2008 at 8:52 AM

That's an GPU implementation detail which GL doesn't care about.
Usually, the framebuffer is layed out in a linear format, very much like a bmp file. A texture, there might be arranged differently
http://www.opengl.org/wiki/index.php/Texture_Mapping

Quote:
GL_TEXTURE_2D has width and height and usually the GPU stores this in memory in a format that is quick to access.
For example, small blocks of the texture are stored in sequence so that cache memory works better. This has been part of GL since 1.0
Texture coordinates are normalized. That means if you have a dimension like 256x256, texcoords are from 0.0 to 1.0.
Of course, if you go beyond that, such as -1.0 to 5.0, then the texture will repeat over your polygon.

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