DDS (file format) - Revision history

CoDEmanX at 13:09, 29 July 2009

2009-07-29T13:09:52Z

← Older revision		Revision as of 13:09, 29 July 2009
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	Drivers can perform this compression on the fly thanks to the GL_ARB_texture_compression extension. Thus, it would appear the only advantage of DDS is just reduced space (meaning faster loading) without "double degradation" caused by recompressing already-compressed formats like JPEG. However, DDS files expose this automated process to artists. This allows the image author to correct or prevent artifacts that might occur in a completely automated compression process, or even emphasize specific parts of an image's MIP maps.		Drivers can perform this compression on the fly thanks to the GL_ARB_texture_compression extension. Thus, it would appear the only advantage of DDS is just reduced space (meaning faster loading) without "double degradation" caused by recompressing already-compressed formats like JPEG. However, DDS files expose this automated process to artists. This allows the image author to correct or prevent artifacts that might occur in a completely automated compression process, or even emphasize specific parts of an image's MIP maps.


	==General File Format Specifications==		==General File Format Specifications==
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	\| 1- to 32-bits		\| 1- to 32-bits
	\|}		\|}



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	* To create and edit DDS files in The Gimp, you must download a [http://nifelheim.dyndns.org/~cocidius/dds/ DDS plugin].		* To create and edit DDS files in The Gimp, you must download a [http://nifelheim.dyndns.org/~cocidius/dds/ DDS plugin].

	See the [[Call of Duty : Texturing\|Texturing]] page for which DXTn method to use depending on the image.		See the [[Call of Duty: Texturing\|Texturing]] page for which DXTn method to use depending on the image.


	[http://www.modwiki.net/wiki/DDS_%28file_format%29 Sources]		[http://www.modwiki.net/wiki/DDS_%28file_format%29 Sources]
	[[Category:Texturing]][[Category:File formats]]
			[[Category:Texturing]]
			[[Category:File formats]]

Zeroy: /* Notes */

2009-01-28T21:05:47Z

Notes

← Older revision		Revision as of 21:05, 28 January 2009
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	* To create and edit DDS files in The Gimp, you must download a [http://nifelheim.dyndns.org/~cocidius/dds/ DDS plugin].		* To create and edit DDS files in The Gimp, you must download a [http://nifelheim.dyndns.org/~cocidius/dds/ DDS plugin].

	See the [[Call of Duty : Texturing\|Texturing]] page for which DXTn method to use depending on the ~~[[Images\|~~image]].		See the [[Call of Duty : Texturing\|Texturing]] page for which DXTn method to use depending on the image.


	[http://www.modwiki.net/wiki/DDS_%28file_format%29 Sources]		[http://www.modwiki.net/wiki/DDS_%28file_format%29 Sources]
	[[Category:Texturing]][[Category:File formats]]		[[Category:Texturing]][[Category:File formats]]

Zeroy: /* Notes */

2009-01-28T21:05:32Z

Notes

← Older revision		Revision as of 21:05, 28 January 2009
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	* To create and edit DDS files in The Gimp, you must download a [http://nifelheim.dyndns.org/~cocidius/dds/ DDS plugin].		* To create and edit DDS files in The Gimp, you must download a [http://nifelheim.dyndns.org/~cocidius/dds/ DDS plugin].

	See the [[Texturing]] page for which DXTn method to use depending on the [[Images\|image]].		See the [[Call of Duty : Texturing\|Texturing]] page for which DXTn method to use depending on the [[Images\|image]].

	~~A DDS file, and its MIP maps, may be edited. See [[Editing MIP Maps]]~~


	[http://www.modwiki.net/wiki/DDS_%28file_format%29 Sources]		[http://www.modwiki.net/wiki/DDS_%28file_format%29 Sources]
	[[Category:Texturing]][[Category:File formats]]		[[Category:Texturing]][[Category:File formats]]

Zeroy: /* Engine specific issues */

2009-01-28T21:04:36Z

Engine specific issues

← Older revision		Revision as of 21:04, 28 January 2009
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	\|}		\|}

	~~==Engine specific issues==~~
	~~Doom 3 makes use of .DDS files when running at a quality setting lower than "Ultra" in order to save texture memory (except for normal maps which only use the .DDS versions at "Medium" or below).~~

	You can force everything to load from the TGA files by setting image_usePrecompressedTextures to 0. The images will still get compressed dynamically at load time (which will slow down loading significantly), but it will make it so that when you change a TGA it will actually show up in game without having to regenerate the DDS files. You can also set [[image_useCompression (cvar)\|image_useCompression]] and [[image_useNormalCompression (cvar)\|image_useNormalCompression]] to 0, which will prevent them from getting compressed at load time (this is similar to running in ultra quality mode).

	~~'''''Notice:''''' This means that if you make changes to a texture and you are running a quality level lower than "Ultra", you will not see the changes because Doom 3 ís reading from the .DDS file.~~

	If you don't have .DDS files for every texture you have made, Doom 3 will create them for you, but separate utilities are often used to convert a .TGA or other texture format into a .DDS format. Some of these tools are available here:

	*[http://developer.nvidia.com/object/nv_texture_tools.html nVidia Texture Tools]
	*[http://www.ati.com/developer/compressonator.html ATI Compressonator]

	==Notes==		==Notes==

Zeroy: /* Engine specific issues */

2009-01-28T21:04:21Z

Engine specific issues

← Older revision		Revision as of 21:04, 28 January 2009
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	Doom 3 makes use of .DDS files when running at a quality setting lower than "Ultra" in order to save texture memory (except for normal maps which only use the .DDS versions at "Medium" or below).		Doom 3 makes use of .DDS files when running at a quality setting lower than "Ultra" in order to save texture memory (except for normal maps which only use the .DDS versions at "Medium" or below).

	You can force everything to load from the TGA files by setting [[image_usePrecompressedTextures ~~(cvar)\|image_usePrecompressedTextures]]~~ to 0. The images will still get compressed dynamically at load time (which will slow down loading significantly), but it will make it so that when you change a TGA it will actually show up in game without having to regenerate the DDS files. You can also set [[image_useCompression (cvar)\|image_useCompression]] and [[image_useNormalCompression (cvar)\|image_useNormalCompression]] to 0, which will prevent them from getting compressed at load time (this is similar to running in ultra quality mode).		You can force everything to load from the TGA files by setting image_usePrecompressedTextures to 0. The images will still get compressed dynamically at load time (which will slow down loading significantly), but it will make it so that when you change a TGA it will actually show up in game without having to regenerate the DDS files. You can also set [[image_useCompression (cvar)\|image_useCompression]] and [[image_useNormalCompression (cvar)\|image_useNormalCompression]] to 0, which will prevent them from getting compressed at load time (this is similar to running in ultra quality mode).

	'''''Notice:''''' This means that if you make changes to a texture and you are running a quality level lower than "Ultra", you will not see the changes because Doom 3 ís reading from the .DDS file.		'''''Notice:''''' This means that if you make changes to a texture and you are running a quality level lower than "Ultra", you will not see the changes because Doom 3 ís reading from the .DDS file.

Zeroy: New page: ==Description== The DirectDraw Surface graphics file format was established by Microsoft for use with the DirectX SDK. The format is specifically designed for use in real-time rendering ap...

2009-01-28T21:03:58Z

New page: ==Description== The DirectDraw Surface graphics file format was established by Microsoft for use with the DirectX SDK. The format is specifically designed for use in real-time rendering ap...

New page

==Description==
The DirectDraw Surface graphics file format was established by Microsoft for use with the DirectX SDK. The format is specifically designed for use in real-time rendering applications, such as 3D games. It can be used to store textures, cubemaps, mipmap levels, and allows for compression. Due to the fact that most video cards natively support DXTn texture compression, use of this format can save memory on the video card.

Drivers can perform this compression on the fly thanks to the GL_ARB_texture_compression extension. Thus, it would appear the only advantage of DDS is just reduced space (meaning faster loading) without "double degradation" caused by recompressing already-compressed formats like JPEG. However, DDS files expose this automated process to artists. This allows the image author to correct or prevent artifacts that might occur in a completely automated compression process, or even emphasize specific parts of an image's MIP maps.

==General File Format Specifications==

{| style="text-align: center; " border="1" cellpadding="0" cellspacing="0"
! Type
| Raster Image Format
|-
! Extension
| *.DDS
|-
! Compression
| None, DXTn
|-
! Color Depth
| 1- to 32-bits
|}

==Engine specific issues==
Doom 3 makes use of .DDS files when running at a quality setting lower than "Ultra" in order to save texture memory (except for normal maps which only use the .DDS versions at "Medium" or below).

You can force everything to load from the TGA files by setting [[image_usePrecompressedTextures (cvar)|image_usePrecompressedTextures]] to 0. The images will still get compressed dynamically at load time (which will slow down loading significantly), but it will make it so that when you change a TGA it will actually show up in game without having to regenerate the DDS files. You can also set [[image_useCompression (cvar)|image_useCompression]] and [[image_useNormalCompression (cvar)|image_useNormalCompression]] to 0, which will prevent them from getting compressed at load time (this is similar to running in ultra quality mode).

'''''Notice:''''' This means that if you make changes to a texture and you are running a quality level lower than "Ultra", you will not see the changes because Doom 3 ís reading from the .DDS file.

If you don't have .DDS files for every texture you have made, Doom 3 will create them for you, but separate utilities are often used to convert a .TGA or other texture format into a .DDS format. Some of these tools are available here:

*[http://developer.nvidia.com/object/nv_texture_tools.html nVidia Texture Tools]
*[http://www.ati.com/developer/compressonator.html ATI Compressonator]

==Notes==

To convert an image to DDS, you can use the same tool id used: The [http://www.ati.com/developer/compressonator.html Compressonator] from ATI.

* To create DDS files in Photoshop you must download the [http://developer.nvidia.com/object/nv_texture_tools.html Nvidia DDS plugin].
* To create and edit DDS files in The Gimp, you must download a [http://nifelheim.dyndns.org/~cocidius/dds/ DDS plugin].

See the [[Texturing]] page for which DXTn method to use depending on the [[Images|image]].

A DDS file, and its MIP maps, may be edited. See [[Editing MIP Maps]]

[http://www.modwiki.net/wiki/DDS_%28file_format%29 Sources]
[[Category:Texturing]][[Category:File formats]]