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tragic

Using Directx11 without using a Microsoft math library

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So as the title states I want to try to use my own math lib (please don't tell me not to reinvent the wheel i enjoy learning and thats what im doing) with directx11 in place of DirectXMath. It would be greatly appreciated if someone could point me in the right direction or even show how this done.

 

 

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Yeah D3D doesn't come with a math library so has no requirements really.

 

The way that you construct your matrices will have an effect on your HLSL code.

 

By default, matrices in HLSL are stored in column-major element order - e.g. for [column,row], the floats are stored in the order [0,0], [0,1], [0,2], [0,3], [1,0], [1,1], etc....

You can explicitly state the storage convention you want to  use by using the appropriate keyword in front of your declaration, like this:

column_major float4x4 myMat;

or

row_major float4x4 myMat;

 

If you use the column-vector convention in your maths, then you'll write mul(myMat, myVec), otherwise if you're using the row-vector convention you'll write mul(myVec, myMat).

 

You can also just tell the runtime when compiling your shaders which order to use with a compile flag.
 

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Or you can write #pragma pack_matrix(row_major/column_major) to set the default storage convention for everything that comes after.

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As far as examples, my own engine doesn't use DirectXMath.  I based my math classes on the Wild Magic engine by Dave Eberly long ago, and they have evolved a little since then.  If you have any specific questions, please be sure to post them and I'm sure there are answers around here!

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Sorry for late reply but i have been rather busy recently but anyways thanks for the advice. Good to know that microsoft doesn't lock you into using their stuff and I do plan on using consistent conventions for making changes and use easier. I browsed through a little bit of your engine Jason and looks like a solid place to start learning :).

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Thanks - if you have any questions about the engine, feel free to post here or in the codeplex discussion forum.  I check both regularly, and I'm always happy to discuss the various design options.

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Thanks - if you have any questions about the engine, feel free to post here or in the codeplex discussion forum.  I check both regularly, and I'm always happy to discuss the various design options.

For sure thank you!

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