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1Name
2
3    OVR_multiview2
4
5Name Strings
6
7    GL_OVR_multiview2
8
9Contact
10
11    Cass Everitt, Oculus (cass.everitt 'at' oculus.com)
12
13Contributors
14
15    John Carmack, Oculus
16    Jan Paul van Waveren, Oculus
17    Jan-Harald Fredriksen, ARM
18    Sam Holmes, Qualcomm
19    Daniel Koch, NVIDIA
20
21Status
22
23    Incomplete.
24
25Version
26
27    Last Modified Date:  October 19, 2018
28    Author Revision: 0.5
29
30Number
31
32    OpenGL Extension #479
33    OpenGL ES Extension #242
34
35Dependencies
36
37    OpenGL 3.0 or OpenGL ES 3.0 is required.
38
39    This extension is written against the OpenGL ES Shading Language 3.00.04
40    specification.
41
42    This extension requires OVR_multiview.
43
44Overview
45
46
47	This extension relaxes the restriction in OVR_multiview that only gl_Position
48	can depend on ViewID in the vertex shader.  With this change, view-dependent
49	outputs like reflection vectors and similar are allowed.
50
51New Tokens
52
53    None.
54
55New Procedures and Functions
56
57    None.
58
59Modifications to The OpenGL ES Shading Language Specification, Version 3.00.04
60
61	Including the following line in a shader can be used to control the language
62	features described in this extension:
63
64      #extension GL_OVR_multiview2 : <behavior>
65
66    where <behavior> is as specified in section 3.5.
67
68    A new preprocessor #define is added to the OpenGL ES Shading Language:
69
70      #define GL_OVR_multiview2 1
71
72    If the OVR_multiview2 extension is enabled, the OVR_multiview extension
73    is also implicitly enabled.
74
75    Modifications to Section 7.1 "Built-in Language Variables" (as modified by
76    OVR_multiview):
77
78    Delete the paragraph which states:
79
80    It is a compile- or link-time error if any output variable other
81    than gl_Position is statically dependent on gl_ViewID_OVR. If an
82    output variable other than gl_Position is dynamically dependent on
83    gl_ViewID_OVR, the values are undefined.
84
85Errors
86
87    None.
88
89Issues
90
91    (1) Does enabling GL_OVR_multiview2 automatically enable GL_OVR_multiview?
92
93    RESOLVED: Yes. This was not specified in early drafts of the extension,
94    but this is the behavior of multiple implementations.
95
96Revision History
97
98      Rev.    Date    Author    Changes
99      ----  --------  --------  -----------------------------------------
100      0.1   03/18/15  cass      Initial draft
101      0.5   10/19/18  dgkoch    Add standard boiler plate shader extension language.
102                                Add issue 1 and clarify that this extension
103                                implicitly enables OVR_multiview.
104