| Name |
| |
| IMG_read_format |
| |
| Name Strings |
| |
| GL_IMG_read_format |
| |
| Notice |
| |
| Copyright Imagination Technologies Limited, 2005, 2008. |
| |
| Contact |
| |
| Imagination Technologies (devtech 'at' imgtec 'dot' com) |
| |
| Status |
| |
| Complete |
| |
| Version |
| |
| Version 1.0 |
| |
| Number |
| |
| OpenGL ES Extension #53 |
| |
| Dependencies |
| |
| GL_OES_read_format is required |
| |
| The extension is written against the OpenGLES 1.0 Specification, |
| which in turn is based OpenGL 1.3. Thus this spec is effectively |
| written against OpenGL 1.3 but does not address sections explicitly |
| removed or reduced by OpenGL-ES 1.0. |
| |
| Overview |
| |
| This extension is intended to supplement the GL_OES_read_format |
| extension by adding support for more format/type combinations to be used |
| when calling ReadPixels. ReadPixels currently accepts one fixed |
| format/type combination (format RGBA and type UNSIGNED_BYTE) for |
| portability, and an implementation specific format/type combination |
| queried using the tokens IMPLEMENTATION_COLOR_READ_FORMAT_OES and |
| IMPLEMENTATION_COLOR_READ_TYPE_OES (GL_OES_read_format extension). This |
| extension adds the following format/type combinations to those currently |
| allowed to be returned by GetIntegerV: |
| |
| format type |
| ------ ---- |
| BGRA_IMG UNSIGNED_BYTE |
| BGRA_IMG UNSIGNED_SHORT_4_4_4_4_REV_IMG |
| |
| E.g. Calling GetIntegerv with a <pname> parameter of |
| IMPLEMENTATION_COLOR_READ_FORMAT_OES can now return BGRA, with the |
| corresponding call to GetIntegerv using a <pname> parameter of |
| IMPLEMENTATION_COLOR_READ_TYPE_OES returning UNSIGNED_BYTE; |
| |
| IP Status |
| |
| Unknown |
| |
| Issues |
| |
| None. |
| |
| New Procedures and Functions |
| |
| None. |
| |
| New Tokens |
| |
| Accepted by the <format> parameter of ReadPixels: |
| |
| GL_BGRA_IMG 0x80E1 |
| GL_UNSIGNED_SHORT_4_4_4_4_REV_IMG 0x8365 |
| |
| 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) |
| |
| None |
| |
| 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 |
| |
| Errors |
| |
| None |
| |
| New State |
| |
| None |
| |
| New Implementation Dependent State |
| |
| None |
| |
| Revision History |
| |
| 1.0, 10/04/2008 gdc: Tidied for publication. |
| 0.2, 25/07/2005 sks: Added 4444. |
| 0.1, 18/04/2005 sks: Initial revision. |
