125 lines
3.6 KiB
Plaintext
125 lines
3.6 KiB
Plaintext
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DirectX 6 Driver for Mesa 3.0
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This software is distributed under the terms of the GNU Library
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General Public License, see the LICENSE file for details.
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What do you need ?
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------------------
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- A PC with a DirectX 6 video driver installed.
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- Mesa 3.0
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- The 3Dfx Glide library 2.3 or later for your OS (the 2.4 works fine).
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The Voodoo2 requires the Glide library 2.51. The Glide 3.0 is not
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compatible with the Glide 2.x so it doesn't work with the current
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version of the driver;
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- Visual C++ 5.0 is only compiler test but others should be ok with
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changes to the makefiles (CFLAGS/LFLAGS).
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- DirectX 6 SDK (was a MS download but not sure if still available).
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- SoftIce or another debugger that will get DPF's is nice.
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Tested on:
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Windows 95
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Windows 98
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Windows NT 5.0 (beta 2)
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What is able to do ?
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--------------------
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- the driver will try and use DirectX to rasterize the OpenGL primitives
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that are sent to the driver. The driver will fall back to SW if the rendering
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context is too big. The fallback to SW still uses DirectDraw. If the driver
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fails to support and operation (accum, stencil, etc) then it will try and get
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Mesa to render it in SW. DirectX 6 features that are unsupported by the
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installed DirectX 6 driver will be mapped to some other best fit feature.
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How to compile:
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---------------
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These instructions assume you have Visual C++ installed.
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You might need to increase you enviroment space. You can do this by
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adding the following statement to you config.sys.
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shell=C:\COMMAND.COM C:\ /p /e:8198
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Next setup you compiler enviroment by running vcvars32.bat in the Visual C++
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'bin' directoy.
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c:\DevStudio\VC\bin\vcvars32.bat
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Modify the D3D makefile to point at your SDK install. Example has the SDK
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installed on my 'f' drive in the root.
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file: \Mesa-3.0\src\makefile.d3d
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SDKROOT=f:\mssdk
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Now you can simply make the project. If you look in the makefile you can see
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I have some different targets like 'install'.
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nmake /f makefile.d3d
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FAQ:
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----
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1) I don't think the driver is using my DirectX driver.
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This maybe true as the current version will only select the Primary D3D driver
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installed. If you 3D card is the secondary (3dfx) then your out of luck for this
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release.
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2) The driver seems like its not HW accelerated.
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If you have a video card with limited memory then you might want to try and
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change your destop resolution to a low setting (640x480x16) so that the 3D part
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of the card has more resources. Remeber the driver can't make the card better...
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3) Nothing works.
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Make sure you have a DirectX '6' driver installed. Check you driver docs for this
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info or use the SDK info utilities.
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The final 'dll' is named opengl32.dll and is either in the same directory as the
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OpenGL program or in your system directory (x:\windows\system or x:\winnt\system32).
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Check your destop resolution. Most DirectX 6 drivers will only support 16bit and
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32bit color depth. To find out for sure you can check the DirectX Info Viewer in
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the SDK.
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4) Rendering doesn't look right.
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Sometimes this is because the card doesn't support a feature that that is required.
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This is usually due to unsupported alpha functions (test/blend) or texture mapping.
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Some cards suffer from too small of an alpha channel. The driver does its best to
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fallback on unsupported features. This is not to say the driver may not have a bug(s).
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5) Textures look bad.
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No mipmapping in this release.
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Thanks to:
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Brian Paul
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Leigh McRae (leigh@altsoftware.com)
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February 9, 1999
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