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Name
QCOM_render_shared_exponent
Name Strings
GL_QCOM_render_shared_exponent
Contributors
Ashish Mathur
Tate Hornbeck
Contact
Jeff Leger - jleger 'at' qti.qualcomm.com
Status
Final
Version
Last Modified Date: Novemeber 24, 2020
Revision: #3
Number
OpenGL ES Extension #334
Dependencies
OpenGL ES 3.0 is required. This extension is written against OpenGL ES 3.2.
Overview
OpenGL ES 3.2 supports a packed, shared exponent floating format RGB9_E5
which is not color-renderable.
This extension enables the packed, shared exponent floating type format RGB9_E5
to be color-renderable using framebuffer objects.
New Procedures and Functions
None
New Tokens
Accepted by the <internalFormat> parameter of RenderbufferStorage:
GL_RGB9_E5 0x8C3D
Additions to Chapter 8 of the OpenGL ES 3.2 Specification
(Textures and Samplers)
Modification in Table 8.10, p.163, 164
Convert the spaces under 'CR' and 'Req. rend.' to a 'check' for the
internal format RGB9_E5.
Insert at the top (first) row in Table 8.14, p. 172.
Destination | Source | Source | Source | Source | Effective
Internal Format | Red Size | Green Size | Blue Size | Alpha Size | Internal Format
----------------|----------|------------|-----------|------------|----------------
any sized | 1<=R<=9 | 1<=G<=9 | 1<=B<=9 | A=0 | RGB9_E5
Additions to Chapter 9 of the OpenGL ES 3.2 Specification
(Framebuffers and Framebuffer Objects)
Modification in section 9.2.5 Required Renderbuffer Formats p. 238
Change the following bullet point from:
For formats RGBA16F, R32F, RG32F and RGBA32F, one sample
to
For formats RGB9_E5, RGBA16F, R32F, RG32F and RGBA32F one sample
Modifications in section 9.6 Conversion to Framebuffer-Attachable Image Components p. 255
Add the following sentence at the end of the section:
"If the format is RGB9E5 then the R, G, and B components, regardless of component masking
as described in section 15.2.2, may participate in the encoding process with the method
described in section 8.5.2."
Modifications in section 9.7 Conversion to RGBA Values p. 255
Add the following sentence at the end of the section:
"If the format is RGB9E5 then the R, G, and B components, regardless of component masking
as described in section 15.2.2, may participate in the decoding process with the method
described in section 8.22."
Additions to Chapter 20 of the OpenGL ES 3.2 Specification
(Context State Queries)
Modification in section 20.3.1 Internal Format Query Parameters p. 444
In the bullet point NUM_SAMPLE_COUNTS change the following sub bullet point from:
If internalformat is RGBA16F, R32F, RG32F, or RGBA32F, zero may be returned.
to
If internalformat is RGB9_E5, RGBA16F, R32F, RG32F, or RGBA32F, zero may be returned.
In the bullet point SAMPLES change the following sub bullet point from:
* A value less than or equal to the value of MAX_SAMPLES, if internalformat is
RGBA16F, R32F, RG32F, or RGBA32F.
to
* A value less than or equal to the value of MAX_SAMPLES, if internalformat is
RGB9_E5, RGBA16F, R32F, RG32F, or RGBA32F.
Errors
No new errors.
Issues
None
Revision History:
Revision: 1 2020-07-25 (asmathur)
initial revision
Revision: 2 2020-10-11 (asmathur)
version 2
Revision: 3 2020-11-24 (asmathur)
version 3