| Name |
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| OES_texture_mirrored_repeat |
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| Name Strings |
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| GL_OES_texture_mirrored_repeat |
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| Contact |
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| Notice |
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| Copyright (c) 2005-2013 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 |
| |
| Status |
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| Version |
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| Last modified date: May 18, 2005 |
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| Number |
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| OpenGL ES Extension #22 |
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| Dependencies |
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| OpenGL ES 1.0 is required. |
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| This extension is based on the ARB_texture_mirrored_repeat |
| extension specification. |
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| Overview |
| |
| This extension extends the set of texture wrap modes to |
| include a mode (GL_MIRRORED_REPEAT) that effectively uses a texture |
| map twice as large at the original image in which the additional half, |
| for each coordinate, of the new image is a mirror image of the original |
| image. |
| |
| This new mode relaxes the need to generate images whose opposite edges |
| match by using the original image to generate a matching "mirror image". |
| |
| Issues |
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| Please refer to the ARB_textured_mirrored_repeat extension specification |
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| New Procedures and Functions |
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| None |
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| New Tokens |
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| Accepted by the <param> parameter of TexParameteri and TexParameterf, |
| and by the <params> parameter of TexParameteriv and TexParameterfv, when |
| their <pname> parameter is TEXTURE_WRAP_S, TEXTURE_WRAP_T, or |
| TEXTURE_WRAP_R: |
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| GL_MIRRORED_REPEAT 0x8370 |
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| Additions to Chapter 2 of the GL Specification (OpenGL Operation) |
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| None. |
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| Additions to Chapter 3 of the GL Specification (Rasterization) |
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| Modify Table 3.19, editing only the following lines: |
| |
| Name Type Legal Values |
| ============== ======= ==================== |
| TEXTURE_WRAP_S integer CLAMP, CLAMP_TO_EDGE, REPEAT, |
| CLAMP_TO_BORDER, MIRRORED_REPEAT |
| TEXTURE_WRAP_T integer CLAMP, CLAMP_TO_EDGE, REPEAT, |
| CLAMP_TO_BORDER, MIRRORED_REPEAT |
| TEXTURE_WRAP_R integer CLAMP, CLAMP_TO_EDGE, REPEAT, |
| CLAMP_TO_BORDER, MIRRORED_REPEAT |
| |
| Add to end of Section 3.8.5 (Subsection "Texture Wrap Modes") |
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| If TEXTURE_WRAP_S, TEXTURE_WRAP_T, or TEXTURE_WRAP_R is set to |
| MIRRORED_REPEAT , the s (or t or r) coordinate is converted to: |
| |
| s - floor(s), if floor(s) is even, or |
| 1 - (s - floor(s)), if floor(s) is odd. |
| |
| The converted s (or t or r) coordinate is then clamped |
| as described for CLAMP_TO_EDGE texture coordinate clamping. |
| |
| Additions to Chapter 4 of the GL Specification (Per-Fragment Operations |
| and the Framebuffer) |
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| None |
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| Additions to Chapter 5 of the GL Specification (Special Functions) |
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| None |
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| Additions to Chapter 6 of the GL Specification (State and State Requests) |
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| None |
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| Additions to Appendix F of the GL Specification (ARB Extensions) |
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| None |
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| Additions to the GLX Specification |
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| None |
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| GLX Protocol |
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| None. |
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| Errors |
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| None |
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| New State |
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| Only the type information changes for these parameters: |
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| Initial |
| Get Value Get Command Type Value Description Sec. Attrib |
| --------- ----------- ---- ------- ----------- ---- ------ |
| TEXTURE_WRAP_S GetTexParameteriv n x Z5 REPEAT Texture Wrap Mode S 3.8 texture |
| TEXTURE_WRAP_T GetTexParameteriv n x Z5 REPEAT Texture Wrap Mode T 3.8 texture |
| TEXTURE_WRAP_R GetTexParameteriv n x Z5 REPEAT Texture Wrap Mode R 3.8 texture |
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| New Implementation Dependent State |
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| None |
