docs: Slowly keep fleshing out more info.

src/gallium/docs/source/distro.rst

@@ -61,10 +61,7 @@ VMWare SVGA
 ATI r300
 ^^^^^^^^
 
-AMD/ATI r600
-^^^^^^^^^^^^
-
-Highly experimental.
+Testing-quality.
 
 Softpipe
 ^^^^^^^^
@@ -109,20 +106,29 @@ Auxiliary
 CSO Cache
 ^^^^^^^^^
 
+The CSO cache is used to accelerate preparation of state by saving
+driver-specific state structures for later use.
+
 Draw
 ^^^^
 
+Draw is a software :ref:`TCL` pipeline for hardware that lacks vertex shaders
+or other essential parts of pre-rasterization vertex preparation.
+
 Gallivm
 ^^^^^^^
 
 Indices
 ^^^^^^^
 
-Tool for translating or generating element indices for element-based
-rendering.
+Indices provides tools for translating or generating element indices for
+use with element-based rendering.
 
-Pipe Buffer Manager
-^^^^^^^^^^^^^^^^^^^
+Pipe Buffer Managers
+^^^^^^^^^^^^^^^^^^^^
+
+Each of these managers provides various services to drivers that are not
+fully utilizing a memory manager.
 
 Remote Debugger
 ^^^^^^^^^^^^^^^
@@ -133,7 +139,8 @@ Runtime Assembly Emission
 TGSI
 ^^^^
 
-Basic utilities for manipulating TGSI streams.
+The TGSI auxiliary module provides basic utilities for manipulating TGSI
+streams.
 
 Translate
 ^^^^^^^^^

src/gallium/docs/source/glossary.rst

@@ -8,3 +8,8 @@ Glossary
       Multi-Sampled Anti-Aliasing. A basic anti-aliasing technique that takes
       multiple samples of the depth buffer, and uses this information to
       smooth the edges of polygons.
+
+   TCL
+      Transform, Clipping, & Lighting. The three stages of preparation in a
+      rasterizing pipeline prior to the actual rasterization of vertices into
+      fragments.