TMmemoryblock (256 bytes)
This contains memory information for Gemini. Some of the locations are updated, some other are filled with ldm of tables of precalculated datas. These must be filled:
+0 ldm start of points workspace
+8 dimension of points workarea in bytes (but currently unused)
+12 ldm start of primitives workspace
+20 dimension of primitives workarea in bytes (but currently unused)
+40 ldm start of Z buffer
+44 ldm colours, materials, textures and groups table
Other relevant values, set by Gemini_Initialise, when you call it with bit 0 (in the flag word) set, are:
+4 first free location in points workspace (where to load Points from file). Updated when loading the file (or editing it).
+16 first free location in primitives workspace (where to load Points from file). Updated when loading the file (or editing it).
When no object is loaded, the default values are:
TMmemoryblock!4 = TMmemoryblock!0 + 58 * 32
TMmemoryblock!16 = TMmemoryblock!12
+52 ldm of texture table
+64 ldm of materials table
+68 ldm of groups table
These three are used by Gemini to speed up things. Instead of recalculating each time the ldm of the start of each area, Gemini simply calculates them once when a Gemini_Initialise is called, storing the start ldm of textures, materials and groups tables out of the address you pass in TMMemoryblock!44.
Simply:
+44 colours, materials, textures and groups table; this is also the ldm of the start of colour area: 512 * 16 bytes
+52 texture table: (previous + 512 * 16); it uses 256 * 32 bytes
+64 materials table: (previous + 256 * 32); it uses 512 * 16 bytes
+68 groups table: (previous + 512 * 16); it uses 2048 * 8 bytes
[sh-index] Back to list of manuals
|
| |
