Name

GL_QCOM_YUV_texture_gather

Jeff Leger ( jleger 'at' qti.qualcomm.com)

Jeff Leger, Qualcomm

Complete

Last Modified Date:         May 13,2019
Revision:                   2

OpenGL ES Extension #307

Requires OpenGL ES 3.0
Requires EXT_YUV_target
Requires EXT_gpu_shader5

Extension EXT_gpu_shader5 introduced the texture gather built-in functions.
Extension EXT_YUV_target adds the ability to sample from YUV textures, but
does not include gather functions.   This extension allows gather function
to be used in combination with the YUV textures exposed in EXT_YUV_target.

No known IP claims.

None

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Including the following line in a shader can be used to control the
language features described in this extension:

  #extension GL_QCOM_YUV_texture_gather : <behavior>

where <behavior> is as specified in section 3.4.

A new preprocessor #define is added to the OpenGL ES Shading Language:

  #define GL_QCOM_YUV_texture_gather       1


Add to the list of texture gather functions as introduced with EXT_gpu_shader5
and core functionality in ESSL 3.1 the following additional function:

vec4 textureGather(__samplerExternal2DY2YEXT sampler, vec2 P [, int comp] )

None.

None.

None

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Rev.    Date      Author    Changes
----  ----------  --------  -----------------------------------------
1     2018-10-18  jleger    initial version
2     2019-05-13  jleger    prepend "GL_" to QCOM_YUV_texture_gather