User talk:Ssg: Difference between revisions

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Revision as of 23:30, 4 September 2007

4,457 bytes added , 4 September 2007

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veni vidi

Geyser

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 boolean          = bool
 color            = color
 bitset           = bitset (In my interpretation a bitset has a lenght of one byte. "Bool" for bitsets is a bit confusing in my opinion. If I recall correctly Oni uses only "bitset collections", which are 4 bitsets in a row (so always 4 bytes are used, even if there's no need for 4 bytes).
+::;ssg
->>I'd strongly suggest vectors, quaternions, planes and matrices.
+:It's "length".
+:SE2 uses COLOR (capitals) as the RGBA type. "color" is mostly OK.
+:"link" (or "link32") is essentially the same type as "res_id", right?
+:Both "link" and "offset" are a bit vague and too weakly typed IMO.
+::See below for the strong typing (WAHA*, VOID*, WAHA0*, etc...)
+:You may be right about [[wikipedia:bitfield|bitfield]]s usually spanning 32 bits.
+::(even though there might be a 16-bit bitfield in [[WMDD]])
+:It's OK to split bitfields in 8-bit or 16-bit groups
+::(but only when it means some actual thematic grouping)
+:The bool32, bool16 and bool8 notation doesn't shock me
+::(also, I can't see what a "bool" is... any example?)
+:As for the high bit, I still think int31bool1 (or int31int1) is better.
+:I also suggest int12int20, int8int24 and int9int9int9int5 for [[OTLF]].
+::[[User:Geyser|geyser]] 01:30, 5 September 2007 (CEST)
+----
-IMO that's not a good idea. It turns "type" more into a "description". F.e. a vector is stored as a float (column "type"). The information that this float is a vector should be placed in the column "description". [[User:Ssg|Ssg]] 23:04, 4 September 2007 (CEST)
+----
+:I'd strongly suggest vectors, quaternions, planes and matrices.
+::[[User:Geyser|geyser]] 01:30, 5 September 2007 (CEST)
+----
+:IMO that's not a good idea. It turns "type" more into a "description". F.e. a vector is stored as a float (column "type"). The information that this float is a vector should be placed in the column "description".
+::[[User:Ssg|Ssg]] 23:04, 4 September 2007 (CEST)
+----
+:Well, types are ''always'' descriptive: more or less so depending on how "strongly typed" the system is.
+::IMO it's better to have the OBD pages as strongly typed as possible; so, ''very'' descriptive types.
+:It's not always justified, but in the case of matrices, vectors, etc, it almost certainly ''is''.
+::[[User:Geyser|geyser]] 01:30, 5 September 2007 (CEST)
+:For instance, a vector is ''not'' a float but a group (struct) of three consistent floats.
+::None of the three floats makes any sense without its two buddies, hence the vector type.
+:Also, treating it as 3 floats leads to redundant entries in the "description" column
+::("x-component of ...", "y-component of ...", "z-component of ..." ... ''every time'')
+:Whereas having a vector type makes the description much lighter and more to the point
+::(e.g., "translation in parent space / world space / whatever")
+:In the case of the vector, at least, I'm sure that I'm right (it's that way in Oni) ^^
+::[[User:Geyser|geyser]] 01:30, 5 September 2007 (CEST)
+:I.e. in Oni's source you'd have something like this:
+ typedef struct Vector {
+     float x, y, z;
+ };
+ typedef struct Quaternion {
+     float x, y, z, w;
+ };
+ typedef struct Matrix {
+     float x1, y1, z1;
+     float x2, y2, z2;
+     float x3, y3, z2;
+     float x4, y4, z4;
+ };
+:And then, in the definition of the file type OBAN:
+ typedef struct ObjectAnimationKeyframe {
+     Quaternion rotation;
+     Vector position;
+     short time;
+ };
+ typedef struct OBAN {
+     char[16] blank_space;
+     Matrix transform_initial;
+     Matrix transform_fixed;
+     short shpadoinkle1;
+     short frames;
+     short shpadoinkle2;
+     short n_keyframes;
+     ObjectAnimationKeyframe[n_keyframes] keyframes;
+ }
+:I don't mean that's exactly how Oni's source looks like,
+::but it makes much more sense to me as a coder than this:
+ typedef struct ObjectAnimationKeyframe {
+     float rotation_x;
+     float rotation_y;
+     float rotation_z;
+     float rotation_w;
+     float position_x;
+     float position_y;
+     float position_z;
+     short time;
+ };
+ typedef struct OBAN {
+     char[16] blank_space;
+     float transform_initial_x1;
+     float transform_initial_y1;
+     float transform_initial_z1;
+     float transform_initial_x2;
+     float transform_initial_y2;
+     float transform_initial_z2;
+     float transform_initial_x3;
+     float transform_initial_y3;
+     float transform_initial_z3;
+     float transform_initial_x4;
+     float transform_initial_y4;
+     float transform_initial_z4;
+     float transform_fixed_x1;
+     float transform_fixed_y1;
+     float transform_fixed_z1;
+     float transform_fixed_x2;
+     float transform_fixed_y2;
+     float transform_fixed_z2;
+     float transform_fixed_x3;
+     float transform_fixed_y3;
+     float transform_fixed_z3;
+     float transform_fixed_x4;
+     float transform_fixed_y4;
+     float transform_fixed_z4;
+     short shpadoinkle1;
+     short frames;
+     short shpadoinkle2;
+     short n_keyframes;
+     ObjectAnimationKeyframe[n_keyframes] keyframes;
+ }
+:Do I have to explain why I like the first OBAN better?
+::[[User:Geyser|geyser]] 01:30, 5 September 2007 (CEST)
+----
 ----
+:Maybe we should add a help page for the file types. This page explains the different types (float, integer, lev_id, links, ...) and how to read them (right to left, if a link ignore the 01, ...).
-Maybe we should add a help page for the file types. This page explains the different types (float, integer, lev_id, links, ...) and how to read them (right to left, if a link ignore the 01, ...).
+::;ssg
+:"File" types??? Do you mean something like this? [[OBD:Data_types]]
+::(I had invited you to have a look at it several times AFAIR)
+:Note that since you're explaining the types anyway,
+::it shouldn't hurt to have a few "complex" types (structs).
+:Feel free to edit types out, but keep a copy in "discussion".
+::[[User:Geyser|geyser]] 01:30, 5 September 2007 (CEST)
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