| Name |
| |
| OES_read_format |
| |
| Name Strings |
| |
| GL_OES_read_format |
| |
| Contact |
| |
| Aaftab Munshi (amunshi@ati.com) |
| |
| Notice |
| |
| Copyright (c) 2003-2013 The Khronos Group Inc. Copyright terms at |
| http://www.khronos.org/registry/speccopyright.html |
| |
| Status |
| |
| Revision 0.2 ratified by the Khronos BOP, July 23, 2003. |
| Revision 0.3 to be ratified |
| |
| Version |
| |
| Last Modifed Date: Jan 4, 2006 |
| Author Revision: 0.3 |
| |
| Number |
| |
| OpenGL ES Extension #17 (formerly OpenGL Extension #295) |
| |
| Dependencies |
| |
| None |
| The extension is written against the OpenGL 1.3 Specification. |
| |
| Overview |
| |
| This extension provides the capability to query an OpenGL |
| implementation for a preferred type and format combination |
| for use with reading the color buffer with the ReadPixels |
| command. The purpose is to enable embedded implementations |
| to support a greatly reduced set of type/format combinations |
| and provide a mechanism for applications to determine which |
| implementation-specific combination is supported. |
| |
| The preferred type and format combination returned may depend |
| on the read surface bound to the current GL context. |
| |
| IP Status |
| |
| None |
| |
| Issues |
| |
| * Should this be generalized for other commands: DrawPixels, TexImage? |
| |
| Resolved: No need to aggrandize. |
| |
| New Procedures and Functions |
| |
| None |
| |
| |
| New Tokens |
| |
| IMPLEMENTATION_COLOR_READ_TYPE_OES 0x8B9A |
| IMPLEMENTATION_COLOR_READ_FORMAT_OES 0x8B9B |
| |
| Additions to Chapter 2 of the OpenGL 1.3 Specification (OpenGL Operation) |
| |
| None |
| |
| |
| Additions to Chapter 3 of the OpenGL 1.3 Specification (Rasterization) |
| |
| None |
| |
| |
| Additions to Chapter 4 of the OpenGL 1.3 Specification (Per-Fragment |
| Operations and the Frame Buffer) |
| |
| Section 4.3 Drawing, Reading, and Copying Pixels |
| |
| Section 4.3.2 Reading Pixels |
| |
| (add paragraph) |
| A single format and type combination, designated the |
| preferred format, is associated with the state variables |
| IMPLEMENTATION_COLOR_READ_FORMAT_OES and |
| IMPLEMENTATION_COLOR_READ_TYPE_OES. The preferred format |
| indicates a read format and type combination that provides optimal |
| performance, for the read surface that is bound to the current |
| GL context, for a particular implementation. The state values |
| are chosen from the set of regularly accepted format |
| and type parameters as shown in tables 3.6 and 3.5. |
| |
| |
| Additions to Chapter 5 of the OpenGL 1.3 Specification (Special Functions) |
| |
| None |
| |
| Additions to Chapter 6 of the OpenGL 1.3 Specification (State and |
| State Requests) |
| |
| None |
| |
| Additions to Appendix A of the OpenGL 1.3 Specification (Invariance) |
| |
| None |
| |
| Additions to the AGL/GLX/WGL Specifications |
| |
| None |
| |
| Additions to the WGL Specification |
| |
| None |
| |
| Additions to the AGL Specification |
| |
| None |
| |
| Additions to Chapter 2 of the GLX 1.3 Specification (GLX Operation) |
| |
| Additions to Chapter 3 of the GLX 1.3 Specification (Functions and Errors) |
| |
| Additions to Chapter 4 of the GLX 1.3 Specification (Encoding on the X |
| Byte Stream) |
| |
| Additions to Chapter 5 of the GLX 1.3 Specification (Extending OpenGL) |
| |
| Additions to Chapter 6 of the GLX 1.3 Specification (GLX Versions) |
| |
| GLX Protocol |
| |
| TBD |
| |
| Errors |
| |
| None |
| |
| New State |
| |
| None |
| |
| New Implementation Dependent State |
| |
| (table 6.28) |
| |
| Get Value Type Get Command Value Description Sec. Attribute |
| --------- ---- ----------- ----- ----------- ----- --------- |
| x_FORMAT_OES Z_11 GetIntegerv - read format 4.3.2 - |
| x_TYPE_OES Z_20 GetIntegerv - read type 4.3.2 - |
| |
| x_ = IMPLEMENTATION_COLOR_READ_ |
| |
| Revision History |
| |
| 02/20/2003 0.1 |
| - Original draft. |
| |
| 07/08/2003 0.2 |
| - Marked issue regarding extending to other commands to resolved. |
| - Hackery to make state table fit in 80 columns |
| - Removed Dependencies on section |
| - Added extension number and enumerant values |
| |
| 01/04/2006 0.3 |
| - Added clarification that format and type value returned |
| depends on the current read surface attached to the current context |
