Is it safe to use the same parameters for input and output in D3DX functions?

Posted by JB on Stack Overflow See other posts from Stack Overflow or by JB
Published on 2010-03-24T10:23:56Z Indexed on 2010/03/24 14:53 UTC
Read the original article Hit count: 272

Filed under:

directx

|

d3dx

Using the D3DX library that is a part of directX, specifically directx9 in this case, I'm wondering if it's safe to use the same matrix (or vector etc) for input and ouput

D3DXMATRIX mat;
D3DXMatrixInverse(&mat, NULL, &mat);

I've been avoiding doing so, assuming that it would result in bad things happening when parts of the array got partly overwritten as results are calculated but I see an awful lot of code around that does exactly this.

A brief test indicates that it seems to work ok, so I'm assuming that the D3DX functions take a copy where necessary of the input data, or some other method to ensure that this works ok, but I can't find it documented anywhere so I'm reluctant to rely on it working.

Is there any official statement on using the functions like this?

© Stack Overflow or respective owner

Related posts about directx

Compatibility between DirectX 9 and DirectX 10 shaders

as seen on Game Development - Search for 'Game Development'
I am a beginner to game development and as I am used to programming in C# I decided to go for XNA. I've been playing around with it for a while and now I am learning the basics of HLSL shaders, I have noticed in the MSDN documentation that there have been some syntax changes in HLSL between DirectX… >>> More
DirectX 9 or DirectX 10 for starters ??

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to do projects to make my resume more appealing to game companies. So I am going to start buying books. But I don't know rather to read DirectX 9 or 10 api books to start off with. DirectX10 is great, but it seems the industry is moving slow to 10. so should I use 9 or go with 10 ?? >>> More
book "Programming Role Playing Games with DirectX 2nd edition" and newer DirectX api

as seen on Stack Overflow - Search for 'Stack Overflow'
I got the book "Programming Role Playing Games with DirectX 2nd edition" and I notice there are things in the book that are now considered deprecated. There is a whole Section on DirectPlay. And as much as I would like to avoid this section, I am afraid it might screw up the entire engine he is trying… >>> More
Need help transforming DirectX 9 skybox hlsl shader to DirectX 11

as seen on Game Development - Search for 'Game Development'
I am in the middle of implementing a skybox to my game. I have been following this tutorial http://rbwhitaker.wikidot.com/skyboxes-2. I am using MonoGame as a framework and in order to support both Windows and Windows 8 metro I need to compile the shader with pixel and vertex shader 4. compile vs_4_0_level_9_1 compile… >>> More
load directx xfile in xaml/wpf

as seen on Stack Overflow - Search for 'Stack Overflow'
How can I load a .x file in xaml/wpf? >>> More

Related posts about d3dx

How to deal with D3DX .dll hell?

as seen on Game Development - Search for 'Game Development'
There's a large number of versions of the D3DX dll, from each SDK update, each version having a unique name (http://www.toymaker.info/Games/html/d3dx_dlls.html). All-too-often, people have versions missing. So even though they have a compatible version of DirectX, your D3D-based project won't run… >>> More
Is it safe to use the same parameters for input and output in D3DX functions?

as seen on Stack Overflow - Search for 'Stack Overflow'
Using the D3DX library that is a part of directX, specifically directx9 in this case, I'm wondering if it's safe to use the same matrix (or vector etc) for input and ouput D3DXMATRIX mat; D3DXMatrixInverse(&mat, NULL, &mat); I've been avoiding doing so, assuming that it would result in… >>> More
Format of compiled directx9 shader files?

as seen on Stack Overflow - Search for 'Stack Overflow'
Is the format of compiled pixel and vertex shader object files as produced by fxc.exe documented anywhere either officially or unofficially? I'd like to be able to read the constant name to register assignments from the shader files. I know that the effects framework in D3DX can do this, but I need… >>> More
Should I continue reading Frank Luna's Introduction to 3D Game Programming with DirectX 11 book after D3DX and XNA Math Library have been deprecated? [on hold]

as seen on Game Development - Search for 'Game Development'
I recently started learning DirectX 11 (C++) by reading Frank Luna's Introduction to 3D Game Programming with DirectX 11. In that the author uses D3DX and XNA Math Library. Since they have been deprecated should I continue using that book? If yes, should I use the deprecated libraries or should… >>> More