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ANGLE_clip_cull_distance.txt
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ANGLE_clip_cull_distance.txt
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Name
ANGLE_clip_cull_distance
Name Strings
GL_ANGLE_clip_cull_distance
Contributors
Contributors to EXT_clip_cull_distance
Members of the WebGL working group
Status
Draft
Version
Last Modified Date: December 1, 2022
Revision: 1
Number
OpenGL ES Extension XX
Dependencies
This specification is written against the OpenGL ES 3.2 Specification
(May 5, 2022), and the OpenGL ES 3.20 Shading Language Specification
(July 10, 2019) but can apply to prior specifications.
OpenGL ES 3.0 and OpenGL ES Shading Language 3.00 are required.
Overview
This extension has the same semantics as EXT_clip_cull_distance but
the number of supported cull distances may be zero.
New Procedures and Functions
None
New Tokens
Accepted by the <pname> parameters of GetBooleanv, GetIntegerv,
GetInteger64v, and GetFloatv:
MAX_CLIP_DISTANCES_ANGLE 0x0D32
MAX_CULL_DISTANCES_ANGLE 0x82F9
MAX_COMBINED_CLIP_AND_CULL_DISTANCES_ANGLE 0x82FA
Accepted by the <pname> parameters of Enable, Disable and IsEnabled:
CLIP_DISTANCE0_ANGLE 0x3000
CLIP_DISTANCE1_ANGLE 0x3001
CLIP_DISTANCE2_ANGLE 0x3002
CLIP_DISTANCE3_ANGLE 0x3003
CLIP_DISTANCE4_ANGLE 0x3004
CLIP_DISTANCE5_ANGLE 0x3005
CLIP_DISTANCE6_ANGLE 0x3006
CLIP_DISTANCE7_ANGLE 0x3007
Additions to OpenGL ES Shading Language 3.20 Specification
Including the following line in a shader can be used to control
the language features described in this extension:
#extension GL_ANGLE_clip_cull_distance : <behavior>
where <behavior> is as described in section 3.4.
A new preprocessor #define is added to the OpenGL ES Shading Language:
#define GL_ANGLE_clip_cull_distance 1
Other additions follow the EXT_clip_cull_distance specification.
Dependencies on cull distance support
If cull distances are not supported, querying MAX_CULL_DISTANCES_ANGLE
and MAX_COMBINED_CLIP_AND_CULL_DISTANCES_ANGLE must return zero, the
built-in constants gl_MaxCullDistances and gl_MaxCombinedClipAndCullDistances
are defined as zero, and gl_CullDistance must not be used in shaders.
New State
Add the following to Table 21.6 (Transformation State):
Initial
Get Value Type Get Command Value Description Sec.
-------------------- ------ ----------- -------- ----------------- ----
CLIP_DISTANCEi_ANGLE 8* x B IsEnabled FALSE ith user clip 12.5
distance enabled
New Implementation Dependent State
Add the following to Table 21.40 (Implementation Dependent Values):
Minimum
Get Value Type Get Command Value Description Sec.
------------------------ ---- ----------- -------- ----------------- ----
MAX_CLIP_DISTANCES_ANGLE Z+ GetIntegerv 8 Max. no. of user 12.5
clip distances
MAX_CULL_DISTANCES_ANGLE Z+ GetIntegerv 0 Max. no. of user 12.5
cull distances
MAX_COMBINED_CLIP_AND- Z+ GetIntegerv 0 Max. combined no. 12.5
_CULL_DISTANCES_ANGLE of user clip and
cull distances
Revision History
12/1/2022 First revision