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1Name
2
3    IMG_read_format
4
5Name Strings
6
7    GL_IMG_read_format
8
9Notice
10
11    Copyright Imagination Technologies Limited, 2005, 2008.
12
13Contact
14
15    Imagination Technologies (devtech 'at' imgtec 'dot' com)
16
17Status
18
19    Complete
20
21Version
22
23    Version 1.0
24
25Number
26
27    OpenGL ES Extension #53
28
29Dependencies
30
31    GL_OES_read_format is required
32
33    The extension is written against the OpenGLES 1.0 Specification,
34    which in turn is based OpenGL 1.3. Thus this spec is effectively
35    written against OpenGL 1.3 but does not address sections explicitly
36    removed or reduced by OpenGL-ES 1.0.
37
38Overview
39
40    This extension is intended to supplement the GL_OES_read_format
41    extension by adding support for more format/type combinations to be used
42    when calling ReadPixels.  ReadPixels currently accepts one fixed
43    format/type combination (format RGBA and type UNSIGNED_BYTE) for
44    portability, and an implementation specific format/type combination
45    queried using the tokens IMPLEMENTATION_COLOR_READ_FORMAT_OES and
46    IMPLEMENTATION_COLOR_READ_TYPE_OES (GL_OES_read_format extension).  This
47    extension adds the following format/type combinations to those currently
48    allowed to be returned by GetIntegerV:
49
50    format                      type
51    ------                      ----
52    BGRA_IMG                    UNSIGNED_BYTE
53    BGRA_IMG                    UNSIGNED_SHORT_4_4_4_4_REV_IMG
54
55    E.g. Calling GetIntegerv with a <pname> parameter of
56    IMPLEMENTATION_COLOR_READ_FORMAT_OES can now return BGRA, with the
57    corresponding call to GetIntegerv using a <pname> parameter of
58    IMPLEMENTATION_COLOR_READ_TYPE_OES returning UNSIGNED_BYTE;
59
60IP Status
61
62    Unknown
63
64Issues
65
66    None.
67
68New Procedures and Functions
69
70    None.
71
72New Tokens
73
74    Accepted by the <format> parameter of ReadPixels:
75
76        GL_BGRA_IMG                          0x80E1
77        GL_UNSIGNED_SHORT_4_4_4_4_REV_IMG    0x8365
78
79Additions to Chapter 2 of the OpenGL 1.3 Specification (OpenGL Operation)
80
81    None
82
83Additions to Chapter 3 of the OpenGL 1.3 Specification (Rasterization)
84
85    None
86
87Additions to Chapter 4 of the OpenGL 1.3 Specification (Per-Fragment Operations and the Frame Buffer)
88
89    None
90
91Additions to Chapter 5 of the OpenGL 1.3 Specification (Special Functions)
92
93    None
94
95Additions to Chapter 6 of the OpenGL 1.3 Specification (State and State Requests)
96
97    None
98
99Errors
100
101    None
102
103New State
104
105    None
106
107New Implementation Dependent State
108
109    None
110
111Revision History
112
113    1.0,  10/04/2008  gdc:  Tidied for publication.
114    0.2,  25/07/2005  sks:  Added 4444.
115    0.1,  18/04/2005  sks:  Initial revision.
116