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260 | with
ada.unchecked_Conversion,
ada.Strings.unbounded.Hash,
ada.Containers.hashed_Maps;
package openGL.Texture
--
-- Provides openGL textures.
--
is
-- Object - an openGL texture 'object'
--
type Object is tagged private;
type Objects is array (Positive range <>) of Object;
null_Object : constant Object;
subtype texture_Name is GL.GLuint; -- An openGL texture object 'Name'.
subtype Dimensions is Extent_2d;
---------
--- Forge
--
package Forge
is
function to_Texture (Name : in texture_Name) return Object;
function to_Texture (Dimensions : in Texture.Dimensions) return Object;
function to_Texture (the_Image : in Image;
use_Mipmaps : in Boolean := True) return Object;
function to_Texture (the_Image : in lucid_Image;
use_Mipmaps : in Boolean := True) return Object;
end Forge;
procedure destroy (Self : in out Object);
procedure free (Self : in out Object);
--------------
--- Attributes
--
function is_Defined (Self : in Object) return Boolean;
function is_Transparent (Self : in Object) return Boolean;
procedure set_Name (Self : in out Object; To : in texture_Name);
function Name (Self : in Object) return texture_Name;
procedure enable (Self : in Object);
procedure set_Image (Self : in out Object; To : in Image;
use_Mipmaps : in Boolean := True);
procedure set_Image (Self : in out Object; To : in lucid_Image;
use_Mipmaps : in Boolean := True);
function Size (Self : in Object) return Texture.Dimensions;
-------
-- Maps
--
type name_Map_of_texture is tagged private;
function fetch (From : access name_Map_of_texture'Class;
texture_Name : in asset_Name) return Object;
--------
-- Pool
--
-- For rapid allocation/deallocation of texture objects.
-- TODO: Move this into a child package ?
type Pool is private;
type Pool_view is access all Pool;
procedure destroy (the_Pool : in out Pool);
function new_Texture (From : access Pool; Size : in Dimensions) return Object;
--
-- Returns a texture object of the requested size.
procedure free (From : in out Pool; the_Texture : in Object);
--
-- Frees a texture for future use.
procedure vacuum (the_Pool : in out Pool);
--
-- Releases any allocated, but unused, texture objects.
-----------
-- GL Enums
--
-- TexFormatEnm
--
type Format is (ALPHA,
RGB, RGBA,
LUMINANCE, LUMINANCE_ALPHA,
R3_G3_B2,
ALPHA4, ALPHA8, ALPHA12, ALPHA16,
LUMINANCE4, LUMINANCE8, LUMINANCE12, LUMINANCE16,
LUMINANCE4_ALPHA4, LUMINANCE6_ALPHA2, LUMINANCE8_ALPHA8, LUMINANCE12_ALPHA4, LUMINANCE12_ALPHA12, LUMINANCE16_ALPHA16,
INTENSITY, INTENSITY4, INTENSITY8, INTENSITY12, INTENSITY16,
RGB4, RGB5, RGB8, RGB10, RGB12, RGB16,
RGBA2, RGBA4, RGB5_A1, RGBA8, RGB10_A2, RGBA12, RGBA16,
BGR, BGRA);
type pixel_Format is (COLOR_INDEX,
RED, GREEN, BLUE, ALPHA,
RGB, RGBA,
LUMINANCE, LUMINANCE_ALPHA);
function to_GL (From : in Format) return GL.GLenum;
function to_GL (From : in pixel_Format) return GL.GLenum;
----------
-- Utility
--
function Power_of_2_Ceiling (From : in Positive) return GL.GLsizei;
private
type Object is tagged
record
Name : aliased texture_Name := 0;
Dimensions : Texture.Dimensions := (0, 0);
is_Transparent : Boolean := False;
Pool : access Texture.Pool;
end record;
-------
-- Maps
--
use Ada.Strings.unbounded;
package name_Maps_of_texture_id is new ada.Containers.hashed_Maps (unbounded_String,
Texture.Object,
Hash,
"=");
type name_Map_of_texture is new name_Maps_of_texture_id.Map with null record;
---------------
--- Rep Clauses
--
for Format use
(ALPHA => 16#1906#,
RGB => 16#1907#,
RGBA => 16#1908#,
LUMINANCE => 16#1909#,
LUMINANCE_ALPHA => 16#190A#,
R3_G3_B2 => 16#2A10#,
ALPHA4 => 16#803B#,
ALPHA8 => 16#803C#,
ALPHA12 => 16#803D#,
ALPHA16 => 16#803E#,
LUMINANCE4 => 16#803F#,
LUMINANCE8 => 16#8040#,
LUMINANCE12 => 16#8041#,
LUMINANCE16 => 16#8042#,
LUMINANCE4_ALPHA4 => 16#8043#,
LUMINANCE6_ALPHA2 => 16#8044#,
LUMINANCE8_ALPHA8 => 16#8045#,
LUMINANCE12_ALPHA4 => 16#8046#,
LUMINANCE12_ALPHA12 => 16#8047#,
LUMINANCE16_ALPHA16 => 16#8048#,
INTENSITY => 16#8049#,
INTENSITY4 => 16#804A#,
INTENSITY8 => 16#804B#,
INTENSITY12 => 16#804C#,
INTENSITY16 => 16#804D#,
RGB4 => 16#804F#,
RGB5 => 16#8050#,
RGB8 => 16#8051#,
RGB10 => 16#8052#,
RGB12 => 16#8053#,
RGB16 => 16#8054#,
RGBA2 => 16#8055#,
RGBA4 => 16#8056#,
RGB5_A1 => 16#8057#,
RGBA8 => 16#8058#,
RGB10_A2 => 16#8059#,
RGBA12 => 16#805A#,
RGBA16 => 16#805B#,
BGR => 16#80E0#,
BGRA => 16#80E1#);
for Format'Size use GL.GLenum'Size;
for pixel_Format use
(COLOR_INDEX => 16#1900#,
RED => 16#1903#,
GREEN => 16#1904#,
BLUE => 16#1905#,
ALPHA => 16#1906#,
RGB => 16#1907#,
RGBA => 16#1908#,
LUMINANCE => 16#1909#,
LUMINANCE_ALPHA => 16#190A#);
for pixel_Format'Size use GL.GLenum'Size;
--------
-- Pool
--
type pool_texture_List is
record
Textures : Objects (1 .. 5_000);
Last : Natural := 0;
end record;
type pool_texture_List_view is access all pool_texture_List;
function Hash (the_Dimensions : in Texture.Dimensions) return ada.Containers.Hash_type;
package size_Maps_of_pool_texture_List is new ada.Containers.hashed_Maps (Key_Type => Dimensions,
Element_Type => pool_texture_List_view,
Hash => Hash,
Equivalent_Keys => "=");
type Pool is
record
Map : size_Maps_of_pool_texture_List.Map;
end record;
-------------
-- Constants
--
null_Object : constant Object := (others => <>);
---------------
-- Conversions
--
function convert_1 is new Ada.Unchecked_Conversion (Format, GL.GLenum);
function convert_2 is new Ada.Unchecked_Conversion (pixel_Format, GL.GLenum);
function to_GL (From : in Format) return GL.GLenum renames convert_1;
function to_GL (From : in pixel_Format) return GL.GLenum renames convert_2;
end openGL.Texture;
|