Document gl3_colorlight and gl_texturemode

doc/030_configuration.md

@@ -222,8 +222,9 @@ General cvars:
 * `cl_lights`: Set to `0` to disable the dynamic lightning.
 
 Both OpenGL renderers:
-* `gl_texturemode`: Set to `GL_NEAREST_MIPMAP_LINEAR` to disable the
-  texture filtering, giving a classic pixel look.
+* `gl_texturemode`: Set to `GL_NEAREST` to disable the texture
+  filtering, giving a classic pixel look. Additionally disabling
+  anisostropic filtering makes it look even more authentic.
 
 The OpenGL 1.4 renderer:
 
@@ -236,6 +237,8 @@ The OpenGL 3.2 renderer:
 * `gl3_particle_square`: When set to `1` the particles are rendered as
   squares.
 
+* `gl3_colorlight`: When set to `0`, the lights and lightmaps are
+  colorless (greyscale-only), like in the original soft renderer.
 
 ## Retexturing Packs
 

doc/040_cvarlist.md

@@ -352,6 +352,15 @@ it's `+set busywait 0` (setting the `busywait` cvar) and `-portable`
   the overlapping surfaces to mitigate the flickering. This may make
   things better or worse, depending on the map.
 
+* **gl_texturemode**: How textures are filtered.
+  - `GL_NEAREST`: No filtering (using value of *nearest* source pixel),
+    mipmaps not used
+  - `GL_LINEAR`: Bilinear filtering, mipmaps not used
+  - `GL_LINEAR_MIPMAP_NEAREST`: The default - Bilinear filtering when
+    scaling up, using mipmaps with nearest/no filtering when scaling down
+  
+  Other supported values: `GL_NEAREST_MIPMAP_NEAREST`,
+  `GL_NEAREST_MIPMAP_LINEAR`, `GL_LINEAR_MIPMAP_LINEAR`
 
 ## Graphics (OpenGL 1.4 only)
 
@@ -403,6 +412,10 @@ it's `+set busywait 0` (setting the `busywait` cvar) and `-portable`
 * **gl3_particle_square**: If set to `1`, particles are rendered as
   squares, like in the old software renderer or Quake 1. Default is `0`.
 
+* **gl3_colorlight**: When set to `0`, the lights and lightmaps are
+  colorless (greyscale-only), like in the original soft renderer.
+  Default is `1`.
+
 
 ## Graphics (Software only)