Hey, like all of you I am a fan of this magnificent game.
Long story short I had issues while running the game with my approx. 13year old pc, specs:
p4 3ghz, 1gig ram, geforce fx 5600 graphics and windows7

So running the game with d3d or anything like glide was impossible, very low framerates. I switched to rOpengl like many of us did. Game becomes playable yes but image quality is not as crisp as d3d renderers.

Here is what you have to do to get crisp image quality:

Negative LOD Bias
Usually, zero lodbias means normal, positive values makes images blurry and negative values for sharper image quality we all know that right. But the games launcher and rOpengl configurer doesn't allow me to set negative lod bias values.
I had to locate rOpenGL.ini in "PATH\Blade of Darkness\Config" and edit it myself. Here are two screenshots comparing changes. As you can see, clear and crisp image quality with Lod bias -3. awesome? it is dude!

Note that there is no anisotropic filtering here, only LOD set to -3, texture filter mode is GL_LINEAR_MIPMAP_LINEAR in both pictures.

My rOpengl.ini here:
[Color]
GammaCorrection=0.100000
Brightness=4.000000
Contrast=4.000000
UseHWGamma=0

[Toon]
LineWidth=0
ShadeMode=Normal
ToonColor=0

[VideoModes]
Window=0
Width=800
Height=600
Bpp=32
Flags=0
Frequency=85

[Misc]
ShowInfo=0
ShowObjTris=0
ShowMapOutlne=0
ShowMapTris=0
SwapInterval=0
UseTextureFont=1
TFontOpaque=0
TFontScale=0.500000

[Texture]
FilterMode=GL_LINEAR_MIPMAP_LINEAR
AnisotropicValue=0
NotCompressedTextures=0
NotPalettes=0
LODBias=-3

[Atmosphere]
FogFactor=0.020000
UseOGLFog=0
FogSubdivide=0

also, I don't understand why a 12 year old game doesn't work well.. seriously, I remember my friend had tnt card probably 32mb (for real) memory and playing on a pentium3 computer.. the fuck happened and game became so beefy, thats whole another question needs to be cleared for us fellow blade of darkness fans!

..I will be pursuing....

Thanks for the investigation. The images look promising ;) If you done tweaking, would you mind to add your tweaks to the GameWiki Site (http://pcgamingwiki.com/wiki/Blade_of_Darkness). That would help some people out ;)