Sunday, 20 September 2009

Fix for shader creation bug in D3DX11 effect library

I've updated the DLL version of the pre-release D3DX11 effect C++ static library (from the Aug 2009 DirectX SDK) with a fix for its failure to create shaders when the feature level is less than 11.

Applications using D3DX11CreateEffectFromMemory now work correctly with hardware acceleration on Direct3D 10.1 graphics cards.

See: (

Unzip and copy this file to the System32 folder.


Saturday, 19 September 2009

DLL version of D3DX11 effect library

I've converted the supplied open source C++ static library version of the D3DX11 effect library to a DLL so that it can be used with Delphi.

See: (

Unzip and copy this file to the System32 folder. The latest copy of the headers are required to link to this version.

So far, this seems to work OK with test applications that use the reference renderer.

However, please note that the Direct3D 11 test applications that I have tried, running with hardware rendering and Direct3D 10.1 feature level, cause my Direct3D 10.1 graphics card drivers (ATI) to crash and restart.

There are two error messages sent from the D3DX11 effects library to "Output" when D3DX11CreateEffectFromMemory is called:

1) "ID3D11Device:: CreateVertexShader: The pClassLinkage parameter must be NULL, unless GetFeatureLevel returns D3D_FEATURE_LEVEL_11_0 or greater".
2) "ID3D11Device:: CreatePixelShader: The pClassLinkage parameter must be NULL, unless GetFeatureLevel returns D3D_FEATURE_LEVEL_11_0 or greater".

Then there are pixel and vertex shader error messages during rendering. It seems that the D3DX11 effects library currently has a problem supporting Direct3D 10.1, coupled with problems in the current ATI drivers.


Thursday, 17 September 2009


I've just uploaded the latest versions.


1) Major changes to identifier naming to make them more Delphiesque.

2) Completed the local maths functions in D3DX10_JSB.pas.

3) Added a translation of D3DX11effect.h to D3DX11_JSB.pas. This was missing from the DirectX 11 SDK (Aug 2009) include folder (as it has not yet gone "live"), but was available in an obscure sub folder. This is not yet tested to any degree, but should be soon, so please become a "Follower" if you want to use this.

4) Added a 'UsePointersForOptionalOutputInterfaces' conditional define for better Clootie/JEDI compatibility with optional output interface parameters. See the 'Translation notes' at the top of the interface units. I strongly recommend that you do not use this because Delphi does not call Release on the interface parameter before it gets overwritten (possibly the only time I've seen any problems with the wonderful Delphi interface handling). If was "nil" before the call, as it often is in initialization code, then things are OK. However, if it was already set then the reference count for the object will not be decremented, leading to difficult to diagnose problems. If you want to use this option, add the conditional define from within project options.

5) Changed enums and records to use the new Delphi style names, with type aliases for the original names to compatibility with existing code. This fixes the problem where Delphi's code insight gives the original C++ names rather than the new Delphi style names.


Monday, 14 September 2009

DirectWrite and Direct2D1

I've added Delphi interface units for DirectWrite and Direct2D1.

I've kept them as separate units (even though there is a small amount of interdependency) because MS say that DirectWrite can render to an arbitrary renderer.

These compile, and I've done minimal testing (e.g. the "Hello World!" test application that you can download).


PS: I've just seen that Delphi 2010 includes a version of D2D1, but not Direct3D 11 etc.

Direct3D 10, 10.1 and 11 Delphi interface units (headers)

I've just converted the Direct3D 10, 10.1 and 11 C++ header files into interface units for use with Delphi 2009 and 2010. The interface units are based on the Aug 2009 version of the Microsoft DirectX 11 SDK (published 8th September 2009). The reason for converting them myself was because I needed them urgently and was not able to wait for the JEDI/Clootie versions.


I will soon be using these myself, and will be posting regular updates as issues arise. Therefore if you have any problems (e.g. unexpected error messages when calling some DirectX methods), please download the latest version from the above link.

The software license is included at the top of each file.

The interface units are intended for Delphi 2009 and 2010, though they may work with other versions. If you are interested in using them with FPC or C++ I may be able to provide either multiple versions or a multi-purpose version, though I would to work with you to test them as I don't have time to install multiple compilers.

Note that Direct3D 10 and 11 are intertwined, so for Direct3D 11 you need both the Direct3D 10 and 11 interface units.

They are not quite compatible with the JEDI equivalents. For example, I've chosen to make optional interface output parameters into "out" parameters rather than pointers. This is to ensure that Release is called on the supplied interface. You can still provide a "nil" parameter - see instructions at the top of the header files. Also I've left enumerations as enumerations rather than changing them to constants, which means that you need to cast them to LongWord in some cases.

If you are interested in this work, please spread the word. If there is enough interest I will consider translating other header files on request. Delphi is a fantastically fast development environment and I am very interested in keeping it alive (in fact I need to - because the last ten years of my life are locked up in it...).

So that I can gauge the level of interest, please do get in touch (e.g. by becoming a "follower", emailing (see the comments at the top of the interface units for my email address) or leaving a message) if you are going to use, or thinking of using, this work.

John Bladen.