| Name |
| |
| OES_texture_half_float_linear |
| OES_texture_float_linear |
| |
| Name Strings |
| |
| GL_OES_texture_half_float_linear, GL_OES_texture_float_linear |
| |
| Contact |
| |
| |
| Notice |
| |
| Copyright (c) 2005-2014 The Khronos Group Inc. Copyright terms at |
| http://www.khronos.org/registry/speccopyright.html |
| |
| Specification Update Policy |
| |
| Khronos-approved extension specifications are updated in response to |
| issues and bugs prioritized by the Khronos OpenGL ES Working Group. For |
| extensions which have been promoted to a core Specification, fixes will |
| first appear in the latest version of that core Specification, and will |
| eventually be backported to the extension document. This policy is |
| described in more detail at |
| https://www.khronos.org/registry/OpenGL/docs/update_policy.php |
| |
| IP Status |
| |
| Please refer to the ARB_texture_float extension. |
| |
| Status |
| |
| Ratified by the Khronos BOP, July 22, 2005. |
| |
| Version |
| |
| Revision 3, September 21, 2018 |
| |
| Number |
| |
| OpenGL ES Extension #35 |
| |
| Dependencies |
| |
| This extension is written against the OpenGL ES 2.0 Specification. |
| |
| This extension is derived from the ARB_texture_float extension. |
| |
| Either |
| - OES_texture_half_float and OES_texture_float are required. |
| or |
| - OpenGL ES 3.0 is required. |
| |
| Overview |
| |
| These extensions expand upon the OES_texture_half_float and |
| OES_texture_float extensions by allowing support for LINEAR |
| magnification filter and LINEAR, NEAREST_MIPMAP_LINEAR, |
| LINEAR_MIPMAP_NEAREST and LINEAR_MIPMAP_NEAREST minification |
| filters. |
| |
| When implemented against OpenGL ES 3.0 or later versions, the |
| existing sized 32-bit floating-point formats become texture-filterable, |
| but no new formats are added. |
| |
| |
| ( Only when implemented against OpenGL ES 3.0 ) |
| |
| Additions to Chapter 3.8.3 of the OpenGL ES 3.0 Specification |
| (Texture Image Specification) |
| |
| Modify Table 3.13, Correspondence of sized internal color formats to base internal format: |
| |
| Check the ``Texture-filterable'' column for the R32F, RG32F, RGB32F, and RGBA32F formats. |
| |
| |
| Issues |
| |
| (1) Can you explain the interactions with OpenGL ES 3.x in more detail? |
| |
| OES_texture_float was written against OpenGL ES 2.0 and adds a set of |
| new unsized formats, including floating-point versions of LUMINANCE and |
| LUMINANCE_ALPHA formats. |
| |
| OES_texture_float_linear and OES_texture_half_float_linear makes these |
| formats filterable for FLOAT and HALF_FLOAT_OES types, respectively. |
| |
| OpenGL ES 3.0 added sized internal formats. The unsized formats and |
| the LUMINANCE formats are considered legacy formats. Floating point |
| versions of these formats were therefore not added in OpenGL ES 3.0. |
| |
| Further, OpenGL ES 3.0 requires that the required floating-point |
| formats with 16-bits per component ('half-float') are filterable, but |
| does not support filtering for floating-point formats with 32-bits per |
| component. |
| |
| Some OpenGL ES 3.0 implementations want a way to indicate that the |
| required floating-point formats with 32-bit per component are also |
| filterable _without_ adding the additional unsized formats from |
| OES_texture_float. This is achieved by exposing this extension without |
| exposing OES_texture_float. |
| |
| For an OpenGL ES 3.0 implementation, the following holds for the |
| combination of the OES_texture_float, OES_texture_float_linear, |
| and OES_texture_half_float_linear extensions: |
| |
| - If none of these extensions are supported: |
| - floating-point formats with 32-bit per component are not filterable |
| - floating-point formats with 16-bit per component are filterable |
| |
| - If OES_texture_float_linear is supported: |
| - all floating-point formats in Table 3.13 are filterable |
| |
| - If OES_texture_float and OES_texture_float_linear are supported: |
| - all floating-point formats in Table 3.13 are filterable |
| - all formats of type FLOAT added by OES_texture_float are filterable |
| |
| - If OES_texture_half_float and OES_texture_half_float_linear are |
| supported: |
| - all floating-point formats in Table 3.13 are filterable |
| - all formats of type HALF_FLOAT_OES added by OES_texture_half_float |
| are filterable |
| |
| New Procedures and Functions |
| |
| None |
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| New Tokens |
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| None |
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| Revision History |
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| 07/06/2005 0.1 Original draft |
| |
| 10/29/2014 2 Add interactions with ES 3.0/3.1. |
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| 09/21/2018 3 Clarified interactions with ES 3.x. |