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From: Gene <gene.ressler@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Simple question with dynamic memory allocation
Date: Sun, 18 Oct 2009 21:44:25 -0700 (PDT)
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Date: 2009-10-18T21:44:25-07:00
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On Oct 18, 11:54=A0pm, Justin Squirek <justin.squi...@gmail.com> wrote:
> I am working on an Ada 3d engine to render 3ds models and right now
> for simplicities sake I was using a record with bounded arrays for the
> model type... However, because 3ds models have multiple groups
> (currently I am restricted to only rendering one per model record) and
> the amount of verticies is unknown I may be wasting memory by having
> the bounded arrays i.e. they are set to MAXIMUM_VERTICES instead of
> just that of a loaded model's mesh's verticies. What is the best way
> to dynamically allocate memory in ada? (I have seen tutorials that use
> Uncheck_Deallocation and linked lists, but I would like to know if
> there is an option through a preexisting ada libraries)
>
>
>
> =A0 =A0 =A0 =A0 ....
> =A0 =A0 =A0 =A0 MAXIMUM_VERTICES =A0 =A0 : CONSTANT :=3D 8000;
> =A0 =A0 =A0 =A0 MAXIMUM_POLYGONS =A0 =A0 : CONSTANT :=3D 8000;
> =A0 =A0 =A0 =A0 MODEL_3DS_MAIN =A0 =A0 =A0 : CONSTANT :=3D 16#4D4D#;
> =A0 =A0 =A0 =A0 MODEL_3DS_EDIT =A0 =A0 =A0 : CONSTANT :=3D 16#3D3D#;
> =A0 =A0 =A0 =A0 MODEL_3DS_MESH =A0 =A0 =A0 : CONSTANT :=3D 16#4100#;
> =A0 =A0 =A0 =A0 MODEL_3DS_NAME =A0 =A0 =A0 : CONSTANT :=3D 16#4000#;
> =A0 =A0 =A0 =A0 MODEL_3DS_VERTCIES =A0 : CONSTANT :=3D 16#4110#;
> =A0 =A0 =A0 =A0 MODEL_3DS_POLYGONS =A0 : CONSTANT :=3D 16#4120#;
> =A0 =A0 =A0 =A0 MODEL_3DS_MAPPING =A0 =A0: CONSTANT :=3D 16#4140#;
> =A0 =A0 =A0 =A0 package Float_32_Elementary_Functions
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 is new Ada.Numerics.Generic_Elementary_Fu=
nctions(Float_32);
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 use Float_32_Elementary_Functions;
> =A0 =A0 =A0 =A0 subtype Record_Vertex
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 is Record_Vector_3d;
> =A0 =A0 =A0 =A0 type Record_Map_Coordinate
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 is record
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 U : Float_32;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 V : Float_32;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 end record;
> =A0 =A0 =A0 =A0 type Record_Polygon
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 is record
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 A : Integer_16_Signed;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 B : Integer_16_Signed;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 C : Integer_16_Signed;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 end record;
> =A0 =A0 =A0 =A0 type Array_Record_Vertex
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 is array (1..MAXIMUM_VERTICES)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 of Record_Vertex;
> =A0 =A0 =A0 =A0 type Array_Record_Vertex_8
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 is array (1..8)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 of Record_Vertex;
> =A0 =A0 =A0 =A0 type Array_Record_Map_Coordinate
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 is array (1..MAXIMUM_VERTICES)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 of Record_Map_Coordinate;
> =A0 =A0 =A0 =A0 type Array_Polygon
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 is array (1..MAXIMUM_POLYGONS, 1..3)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 of Integer_16_Unsigned;
> =A0 =A0 =A0 =A0 type Record_Model
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 is record
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 File_Name =A0 =A0 =A0: Un=
bounded_String =A0 =A0 =A0 =A0 =A0 =A0:=3D To_Unbounded_String
> ("");
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Vertices =A0 =A0 =A0 : In=
teger_16_Unsigned =A0 =A0 =A0 =A0 :=3D 0;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Polygons =A0 =A0 =A0 : In=
teger_16_Unsigned =A0 =A0 =A0 =A0 :=3D 0;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Texture_Id =A0 =A0 : Inte=
ger_32_Unsigned =A0 =A0 =A0 =A0 :=3D 0;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Name =A0 =A0 =A0 =A0 =A0 =
: String(1..20) =A0 =A0 =A0 =A0 =A0 =A0 =A0 :=3D (others =3D>
> Character'Val(0));
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Polygon =A0 =A0 =A0 =A0: =
Array_Polygon =A0 =A0 =A0 =A0 =A0 =A0 =A0 :=3D (others =3D> (others
> =3D> 0));
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Map_Coordinate : Array_Re=
cord_Map_Coordinate :=3D (others =3D> (others
> =3D> 0.0));
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Vertex =A0 =A0 =A0 =A0 : =
Array_Record_Vertex =A0 =A0 =A0 =A0 :=3D (others =3D> (others
> =3D> 0.0));
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Normal =A0 =A0 =A0 =A0 : =
Array_Record_Vertex =A0 =A0 =A0 =A0 :=3D (others =3D> (others
> =3D> 0.0));
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Sphere_Vertex =A0: Array_=
Record_Vertex_8 =A0 =A0 =A0 :=3D (others =3D> (others
> =3D> 0.0));
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Sphere_Center =A0: Record=
_Vertex =A0 =A0 =A0 =A0 =A0 =A0 =A0 :=3D (others =3D> 0.0);
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Sphere_Radius =A0: Float_=
32 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0:=3D 0.0;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 end record;
> =A0 =A0 =A0 =A0 type Record_Model_Constant_Access
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 is access constant Record_Model;
> =A0 =A0 =A0 =A0 ...
> <<<
>
> 3ds Mesh rendered with engine at current stage:
> [1]http://i971.photobucket.com/albums/ae196/Justin_Sq/ada_3ds_render.jpg
>
> Thanks in advance for any help:)

Look at the generic Ada.Containers.Vector.