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Merge pull request #3807 from Calinou/binary-serialization-color-overbright

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Mention that colors can be overbright in Binary serialization API
This commit is contained in:
Rémi Verschelde
2020-07-21 13:41:41 +02:00
committed by GitHub
parent a395c99082 cbb5f8c1ef
commit f556bfb12f
1 changed files with 75 additions and 74 deletions
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149
tutorials/misc/binary_serialization_api.rst
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@@ -10,13 +10,13 @@ Godot has a simple serialization API based on Variant. It's used for
converting data types to an array of bytes efficiently. This API is used
in the functions ``get_var`` and ``store_var`` of :ref:`class_File`
as well as the packet APIs for :ref:`class_PacketPeer`. This format
is not used for binary scenes and resources.
is *not* used for binary scenes and resources.
Packet specification
--------------------
The packet is designed to be always padded to 4 bytes. All values are
little endian encoded. All packets have a 4 byte header representing an
little-endian-encoded. All packets have a 4-byte header representing an
integer, specifying the type of data:
+--------+--------------------------+
@@ -83,11 +83,12 @@ integer, specifying the type of data:
| 29 | max |
+--------+--------------------------+
Following this is the actual packet contents, which varies for each type
of packet. Note that this assumes Godot is compiled with single precision
floats. If instead doubles are used, the length of "Float" fields within
data structures should be 8, and the offset should be (offset - 4) * 2 + 4.
The "float" type itself is always double precision.
Following this is the actual packet contents, which varies for each type of
packet. Note that this assumes Godot is compiled with single-precision floats,
which is the default. If Godot was compiled with double-precision floats, the
length of "Float" fields within data structures should be 8, and the offset
should be ``(offset - 4) * 2 + 4``. The "float" type itself always uses double
precision.
0: null
~~~~~~~
@@ -107,7 +108,7 @@ The "float" type itself is always double precision.
+----------+-------+-----------+--------------------------+
| Offset | Len | Type | Description |
+==========+=======+===========+==========================+
| 4 | 8 | Integer | Signed, 64-bit Integer |
| 4 | 8 | Integer | 64-bit signed integer |
+----------+-------+-----------+--------------------------+
3: :ref:`float<class_float>`
@@ -116,7 +117,7 @@ The "float" type itself is always double precision.
+----------+-------+---------+-----------------------------------+
| Offset | Len | Type | Description |
+==========+=======+=========+===================================+
| 4 | 8 | Float | IEEE 754 Double-precision Float |
| 4 | 8 | Float | IEEE 754 double-precision float |
+----------+-------+---------+-----------------------------------+
4: :ref:`String<class_string>`
@@ -125,9 +126,9 @@ The "float" type itself is always double precision.
+----------+-------+-----------+----------------------------+
| Offset | Len | Type | Description |
+==========+=======+===========+============================+
| 4 | 4 | Integer | String Length (in Bytes) |
| 4 | 4 | Integer | String length (in bytes) |
+----------+-------+-----------+----------------------------+
| 8 | X | Bytes | UTF-8 Encoded String |
| 8 | X | Bytes | UTF-8 encoded string |
+----------+-------+-----------+----------------------------+
This field is padded to 4 bytes.
@@ -138,9 +139,9 @@ This field is padded to 4 bytes.
+----------+-------+---------+----------------+
| Offset | Len | Type | Description |
+==========+=======+=========+================+
| 4 | 4 | Float | X Coordinate |
| 4 | 4 | Float | X coordinate |
+----------+-------+---------+----------------+
| 8 | 4 | Float | Y Coordinate |
| 8 | 4 | Float | Y coordinate |
+----------+-------+---------+----------------+
6: :ref:`Rect2<class_rect2>`
@@ -149,13 +150,13 @@ This field is padded to 4 bytes.
+----------+-------+---------+----------------+
| Offset | Len | Type | Description |
+==========+=======+=========+================+
| 4 | 4 | Float | X Coordinate |
| 4 | 4 | Float | X coordinate |
+----------+-------+---------+----------------+
| 8 | 4 | Float | Y Coordinate |
| 8 | 4 | Float | Y coordinate |
+----------+-------+---------+----------------+
| 12 | 4 | Float | X Size |
| 12 | 4 | Float | X size |
+----------+-------+---------+----------------+
| 16 | 4 | Float | Y Size |
| 16 | 4 | Float | Y size |
+----------+-------+---------+----------------+
7: :ref:`Vector3<class_vector3>`
@@ -164,11 +165,11 @@ This field is padded to 4 bytes.
+----------+-------+---------+----------------+
| Offset | Len | Type | Description |
+==========+=======+=========+================+
| 4 | 4 | Float | X Coordinate |
| 4 | 4 | Float | X coordinate |
+----------+-------+---------+----------------+
| 8 | 4 | Float | Y Coordinate |
| 8 | 4 | Float | Y coordinate |
+----------+-------+---------+----------------+
| 12 | 4 | Float | Z Coordinate |
| 12 | 4 | Float | Z coordinate |
+----------+-------+---------+----------------+
8: :ref:`Transform2D<class_transform2d>`
@@ -226,17 +227,17 @@ This field is padded to 4 bytes.
+----------+-------+---------+----------------+
| Offset | Len | Type | Description |
+==========+=======+=========+================+
| 4 | 4 | Float | X Coordinate |
| 4 | 4 | Float | X coordinate |
+----------+-------+---------+----------------+
| 8 | 4 | Float | Y Coordinate |
| 8 | 4 | Float | Y coordinate |
+----------+-------+---------+----------------+
| 12 | 4 | Float | Z Coordinate |
| 12 | 4 | Float | Z coordinate |
+----------+-------+---------+----------------+
| 16 | 4 | Float | X Size |
| 16 | 4 | Float | X size |
+----------+-------+---------+----------------+
| 20 | 4 | Float | Y Size |
| 20 | 4 | Float | Y size |
+----------+-------+---------+----------------+
| 24 | 4 | Float | Z Size |
| 24 | 4 | Float | Z size |
+----------+-------+---------+----------------+
12: :ref:`Basis<class_basis>`
@@ -298,17 +299,17 @@ This field is padded to 4 bytes.
14: :ref:`Color<class_color>`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+----------+-------+---------+----------------+
| Offset | Len | Type | Description |
+==========+=======+=========+================+
| 4 | 4 | Float | Red (0..1) |
+----------+-------+---------+----------------+
| 8 | 4 | Float | Green (0..1) |
+----------+-------+---------+----------------+
| 12 | 4 | Float | Blue (0..1) |
+----------+-------+---------+----------------+
| 16 | 4 | Float | Alpha (0..1) |
+----------+-------+---------+----------------+
+----------+-------+---------+--------------------------------------------------------------+
| Offset | Len | Type | Description |
+==========+=======+=========+==============================================================+
| 4 | 4 | Float | Red (typically 0..1, can be above 1 for overbright colors) |
+----------+-------+---------+--------------------------------------------------------------+
| 8 | 4 | Float | Green (typically 0..1, can be above 1 for overbright colors) |
+----------+-------+---------+--------------------------------------------------------------+
| 12 | 4 | Float | Blue (typically 0..1, can be above 1 for overbright colors) |
+----------+-------+---------+--------------------------------------------------------------+
| 16 | 4 | Float | Alpha (0..1) |
+----------+-------+---------+--------------------------------------------------------------+
15: :ref:`NodePath<class_nodepath>`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -316,7 +317,7 @@ This field is padded to 4 bytes.
+----------+-------+-----------+-----------------------------------------------------------------------------------------+
| Offset | Len | Type | Description |
+==========+=======+===========+=========================================================================================+
| 4 | 4 | Integer | String Length, or New Format (val&0x80000000!=0 and NameCount=val&0x7FFFFFFF) |
| 4 | 4 | Integer | String length, or new format (val&0x80000000!=0 and NameCount=val&0x7FFFFFFF) |
+----------+-------+-----------+-----------------------------------------------------------------------------------------+
For old format:
@@ -325,7 +326,7 @@ For old format:
+----------+-------+---------+------------------------+
| Offset | Len | Type | Description |
+==========+=======+=========+========================+
| 8 | X | Bytes | UTF-8 Encoded String |
| 8 | X | Bytes | UTF-8 encoded string |
+----------+-------+---------+------------------------+
Padded to 4 bytes.
@@ -336,7 +337,7 @@ For new format:
+----------+-------+-----------+-------------------------------------+
| Offset | Len | Type | Description |
+==========+=======+===========+=====================================+
| 4 | 4 | Integer | Sub-Name Count |
| 4 | 4 | Integer | Sub-name count |
+----------+-------+-----------+-------------------------------------+
| 8 | 4 | Integer | Flags (absolute: val&1 != 0 ) |
+----------+-------+-----------+-------------------------------------+
@@ -346,9 +347,9 @@ For each Name and Sub-Name
+----------+-------+-----------+------------------------+
| Offset | Len | Type | Description |
+==========+=======+===========+========================+
| X+0 | 4 | Integer | String Length |
| X+0 | 4 | Integer | String length |
+----------+-------+-----------+------------------------+
| X+4 | X | Bytes | UTF-8 Encoded String |
| X+4 | X | Bytes | UTF-8 encoded string |
+----------+-------+-----------+------------------------+
Every name string is padded to 4 bytes.
@@ -389,7 +390,7 @@ other, using this same format.
+---------------+-------+-----------+------------------------+
| Offset | Len | Type | Description |
+===============+=======+===========+========================+
| 4 | 4 | Integer | Array Length (Bytes) |
| 4 | 4 | Integer | Array length (Bytes) |
+---------------+-------+-----------+------------------------+
| 8..8+length | 1 | Byte | Byte (0..255) |
+---------------+-------+-----------+------------------------+
@@ -402,9 +403,9 @@ The array data is padded to 4 bytes.
+------------------+-------+-----------+---------------------------+
| Offset | Len | Type | Description |
+==================+=======+===========+===========================+
| 4 | 4 | Integer | Array Length (Integers) |
| 4 | 4 | Integer | Array length (Integers) |
+------------------+-------+-----------+---------------------------+
| 8..8+length\*4 | 4 | Integer | 32 Bits Signed Integer |
| 8..8+length\*4 | 4 | Integer | 32-bit signed integer |
+------------------+-------+-----------+---------------------------+
22: :ref:`PackedInt64Array<class_PackedInt64Array>`
@@ -413,9 +414,9 @@ The array data is padded to 4 bytes.
+------------------+-------+-----------+---------------------------+
| Offset | Len | Type | Description |
+==================+=======+===========+===========================+
| 4 | 8 | Integer | Array Length (Integers) |
| 4 | 8 | Integer | Array length (Integers) |
+------------------+-------+-----------+---------------------------+
| 8..8+length\*8 | 8 | Integer | 64 Bits Signed Integer |
| 8..8+length\*8 | 8 | Integer | 64-bit signed integer |
+------------------+-------+-----------+---------------------------+
23: :ref:`PackedFloat32Array<class_PackedFloat32Array>`
@@ -424,9 +425,9 @@ The array data is padded to 4 bytes.
+------------------+-------+-----------+-------------------------------------------+
| Offset | Len | Type | Description |
+==================+=======+===========+===========================================+
| 4 | 4 | Integer | Array Length (Floats) |
| 4 | 4 | Integer | Array length (Floats) |
+------------------+-------+-----------+-------------------------------------------+
| 8..8+length\*4 | 4 | Integer | 32 Bits IEEE 754 Single-precision float |
| 8..8+length\*4 | 4 | Integer | 32-bit IEEE 754 single-precision float |
+------------------+-------+-----------+-------------------------------------------+
24: :ref:`PackedFloat64Array<class_PackedFloat64Array>`
@@ -435,9 +436,9 @@ The array data is padded to 4 bytes.
+------------------+-------+-----------+-------------------------------------------+
| Offset | Len | Type | Description |
+==================+=======+===========+===========================================+
| 4 | 4 | Integer | Array Length (Floats) |
| 4 | 4 | Integer | Array length (Floats) |
+------------------+-------+-----------+-------------------------------------------+
| 8..8+length\*8 | 8 | Integer | 64 Bits IEEE 754 Double-precision float |
| 8..8+length\*8 | 8 | Integer | 64-bit IEEE 754 double-precision float |
+------------------+-------+-----------+-------------------------------------------+
25: :ref:`PackedStringArray<class_PackedStringArray>`
@@ -446,7 +447,7 @@ The array data is padded to 4 bytes.
+----------+-------+-----------+--------------------------+
| Offset | Len | Type | Description |
+==========+=======+===========+==========================+
| 4 | 4 | Integer | Array Length (Strings) |
| 4 | 4 | Integer | Array length (Strings) |
+----------+-------+-----------+--------------------------+
For each String:
@@ -454,9 +455,9 @@ For each String:
+----------+-------+-----------+------------------------+
| Offset | Len | Type | Description |
+==========+=======+===========+========================+
| X+0 | 4 | Integer | String Length |
| X+0 | 4 | Integer | String length |
+----------+-------+-----------+------------------------+
| X+4 | X | Bytes | UTF-8 Encoded String |
| X+4 | X | Bytes | UTF-8 encoded string |
+----------+-------+-----------+------------------------+
Every string is padded to 4 bytes.
@@ -467,11 +468,11 @@ Every string is padded to 4 bytes.
+-------------------+-------+-----------+----------------+
| Offset | Len | Type | Description |
+===================+=======+===========+================+
| 4 | 4 | Integer | Array Length |
| 4 | 4 | Integer | Array length |
+-------------------+-------+-----------+----------------+
| 8..8+length\*8 | 4 | Float | X Coordinate |
| 8..8+length\*8 | 4 | Float | X coordinate |
+-------------------+-------+-----------+----------------+
| 8..12+length\*8 | 4 | Float | Y Coordinate |
| 8..12+length\*8 | 4 | Float | Y coordinate |
+-------------------+-------+-----------+----------------+
27: :ref:`PackedVector3Array<class_PackedVector3Array>`
@@ -480,28 +481,28 @@ Every string is padded to 4 bytes.
+--------------------+-------+-----------+----------------+
| Offset | Len | Type | Description |
+====================+=======+===========+================+
| 4 | 4 | Integer | Array Length |
| 4 | 4 | Integer | Array length |
+--------------------+-------+-----------+----------------+
| 8..8+length\*12 | 4 | Float | X Coordinate |
| 8..8+length\*12 | 4 | Float | X coordinate |
+--------------------+-------+-----------+----------------+
| 8..12+length\*12 | 4 | Float | Y Coordinate |
| 8..12+length\*12 | 4 | Float | Y coordinate |
+--------------------+-------+-----------+----------------+
| 8..16+length\*12 | 4 | Float | Z Coordinate |
| 8..16+length\*12 | 4 | Float | Z coordinate |
+--------------------+-------+-----------+----------------+
28: :ref:`PackedColorArray<class_PackedColorArray>`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+--------------------+-------+-----------+----------------+
| Offset | Len | Type | Description |
+====================+=======+===========+================+
| 4 | 4 | Integer | Array Length |
+--------------------+-------+-----------+----------------+
| 8..8+length\*16 | 4 | Float | Red (0..1) |
+--------------------+-------+-----------+----------------+
| 8..12+length\*16 | 4 | Float | Green (0..1) |
+--------------------+-------+-----------+----------------+
| 8..16+length\*16 | 4 | Float | Blue (0..1) |
+--------------------+-------+-----------+----------------+
| 8..20+length\*16 | 4 | Float | Alpha (0..1) |
+--------------------+-------+-----------+----------------+
+--------------------+-------+-----------+--------------------------------------------------------------+
| Offset | Len | Type | Description |
+====================+=======+===========+==============================================================+
| 4 | 4 | Integer | Array length |
+--------------------+-------+-----------+--------------------------------------------------------------+
| 8..8+length\*16 | 4 | Float | Red (typically 0..1, can be above 1 for overbright colors) |
+--------------------+-------+-----------+--------------------------------------------------------------+
| 8..12+length\*16 | 4 | Float | Green (typically 0..1, can be above 1 for overbright colors) |
+--------------------+-------+-----------+--------------------------------------------------------------+
| 8..16+length\*16 | 4 | Float | Blue (typically 0..1, can be above 1 for overbright colors) |
+--------------------+-------+-----------+--------------------------------------------------------------+
| 8..20+length\*16 | 4 | Float | Alpha (0..1) |
+--------------------+-------+-----------+--------------------------------------------------------------+