| Name |
| |
| IMG_image_plane_attribs |
| |
| Name Strings |
| |
| EGL_IMG_image_plane_attribs |
| |
| Contributors |
| |
| Ben Bowman |
| Alistair Strachan |
| |
| Contacts |
| |
| Tobias Hector, Imagination Technologies (tobias 'dot' hector 'at' |
| imgtec 'dot' com) |
| |
| Status |
| |
| Complete |
| |
| Version |
| |
| Version 0.4, October 18, 2015 |
| |
| Number |
| |
| EGL Extension #95 |
| |
| Dependencies |
| |
| EGL_KHR_image_base is required. |
| |
| One of EGL_KHR_image, EGL_KHR_image_pixmap or |
| EGL_ANDROID_image_native_buffer is required. |
| |
| This extension is written against the wording of the EGL 1.2 |
| Specification as modified by EGL_KHR_image_base, |
| EGL_ANDROID_image_native_buffer and EGL_KHR_image_pixmap. |
| This extension interacts with GL_OES_EGL_image and GL_EXT_texture_rg. |
| |
| Overview |
| |
| This extension allows creating an EGLImage from a single plane of a |
| multi-planar Android native image buffer (ANativeWindowBuffer) or |
| a native pixmap (EGLNativePixmap). |
| |
| New Types |
| |
| None |
| |
| New Procedures and Functions |
| |
| None |
| |
| New Tokens |
| |
| Accepted by the <attrib_list> parameter of eglCreateImageKHR: |
| |
| EGL_NATIVE_BUFFER_MULTIPLANE_SEPARATE_IMG 0x3105 |
| EGL_NATIVE_BUFFER_PLANE_OFFSET_IMG 0x3106 |
| |
| Additions to Chapter 2 of the EGL 1.2 Specification (EGL Operation) |
| |
| Add to section 2.5.1 "EGLImage Specification" (as defined by the |
| EGL_KHR_image_base specification), in the description of |
| eglCreateImageKHR: |
| |
| Add the following to Table bbb (Legal attributes for eglCreateImageKHR |
| <attr_list> parameter), Section 2.5.1 (EGLImage Specification) |
| |
| +-----------------------------+-------------------------+---------------------------+---------------+ |
| | Attribute | Description | Valid <target>s | Default Value | |
| +-----------------------------+-------------------------+---------------------------+---------------+ |
| | EGL_NATIVE_BUFFER_MULTI | Whether a multiplane | EGL_NATIVE_BUFFER_ANDROID | EGL_FALSE | |
| | PLANE_SEPARATE_IMG | native buffer should be | EGL_NATIVE_PIXMAP_KHR | | |
| | | treated as separate | | | |
| | | buffers | | | |
| | | | | | |
| | EGL_NATIVE_BUFFER_ | Which plane of a multi- | EGL_NATIVE_BUFFER_ANDROID | 0 | |
| | PLANE_OFFSET_IMG | plane native buffer is | EGL_NATIVE_PIXMAP_KHR | | |
| | | used as the EGLImage | | | |
| | | source | | | |
| +-----------------------------+-------------------------+---------------------------+---------------+ |
| Table bbb. Legal attributes for eglCreateImageKHR <attrib_list> parameter |
| |
| ... |
| |
| If <target> is EGL_NATIVE_BUFFER_ANDROID or EGL_NATIVE_PIXMAP_KHR, and |
| <buffer> is a handle to a valid multi-planar surface, such as a YUV420 2 or |
| 3 planar video surface, an EGLImage will be created from only one of the |
| planes, as opposed to a single image representing all of the planes as is |
| normally the case. The intention of this extension is that a call to |
| glEGLImageTargetTexture2DOES or EGLImageTargetRenderbufferStorageOES with an |
| EGLImage created from a single plane of a multiplanar buffer will result in |
| a GL_RED or GL_RG texture or renderbuffer, depending on the format of the |
| multiplanar buffer. This allows an application to work directly in the YUV |
| colorspace, rather than forcing a conversion to the linear RGB colorspace, |
| potentially losing precision. |
| |
| The size of each image will represent the actual size of the data buffer |
| for that plane which may mean that the size of an EGLImage created from |
| plane 0 of a multi-planar buffer may not be the same as that of one |
| created from plane 1, which is determined by the YUV's sampling ratio (e.g. |
| a 420 will have planes 1 and 2, if present, represented by an image of half |
| the width). |
| |
| Add to the list of error conditions for eglCreateImageKHR: |
| |
| "* If EGL_NATIVE_BUFFER_MULTIPLANE_SEPARATE_IMG is EGL_TRUE, and <target> |
| is not EGL_NATIVE_BUFFER_ANDROID or EGL_NATIVE_PIXMAP_KHR, the error |
| EGL_BAD_PARAMETER is generated. |
| |
| * If EGL_NATIVE_BUFFER_MULTIPLANE_SEPARATE_IMG is EGL_TRUE, and |
| EGL_NATIVE_BUFFER_PLANE_OFFSET_IMG is greater than or equal to the |
| number of planes in <buffer>, the error EGL_BAD_MATCH is generated. |
| |
| * If EGL_NATIVE_BUFFER_MULTIPLANE_SEPARATE_IMG is EGL_FALSE, and |
| EGL_NATIVE_BUFFER_PLANE_OFFSET_IMG is greater than 0, the error |
| EGL_BAD_PARAMETER is generated. |
| |
| * If EGL_NATIVE_BUFFER_MULTIPLANE_SEPARATE_IMG is EGL_TRUE, and the |
| format of <buffer> is not supported by the implementation, |
| EGL_BAD_PARAMETER is generated." |
| |
| Dependencies on EGL_KHR_image_pixmap or EGL_KHR_image |
| |
| If neither of these extensions are supported, remove all references to |
| native pixmaps and EGL_NATIVE_PIXMAP_KHR. |
| |
| Dependencies on EGL_ANDROID_image_native_buffer |
| |
| If this extension is not supported, remove all references to |
| ANativeWindowBuffer and EGL_NATIVE_BUFFER_ANDROID. |
| |
| Issues |
| |
| None |
| |
| Revision History |
| |
| #0.4 (Tobias Hector, October, 2015) |
| - Add interactions with EGL_KHR_image_pixmap/EGL_KHR_image |
| - Added error language for unsupported formats |
| #0.3 (Jon Leech, June 13, 2013) |
| - Add a "Valid Targets" column to table bbb for new attributes, matching |
| proposed changes in EGL_KHR_image_base (Bug 10151). Note that this |
| change implies a new error will be generated when <target> is not |
| EGL_NATIVE_BUFFER_ANDROID and EGL_NATIVE_BUFFER_PLANE_OFFSET_IMG is |
| specified in <attrib_list>; this falls out from the generic |
| target-attribute matching error added to EGL_KHR_image_base. |
| #0.2 (Ben Bowman, May 30, 2012) |
| - Fixed some typos |
| #0.1 (Ben Bowman, May 30, 2012) |
| - First draft of extension . |
