| Name |
| |
| ARM_image_format |
| |
| Name Strings |
| |
| EGL_ARM_image_format |
| |
| Contributors |
| |
| Jan-Harald Fredriksen |
| |
| Contact |
| |
| Jan-Harald Fredriksen (jan-harald.fredriksen 'at' arm.com) |
| |
| IP Status |
| |
| No known IP claims. |
| |
| Status |
| |
| Complete |
| |
| Version |
| |
| Version 1 - February 18, 2020 |
| |
| Number |
| |
| 138 |
| |
| Dependencies |
| |
| This extension is written against the wording of the EGL 1.4 |
| specification. |
| |
| This extension reuses tokens from EGL_EXT_pixel_format_float. |
| |
| Overview |
| |
| When an EGLImage is created from an existing image resource the |
| implementation will deduce the format of the image data from that |
| resource. In some cases, however, the implementation may not know how to |
| map the existing image resource to a known format. This extension extends |
| the list of attributes accepted by eglCreateImageKHR such that applications |
| can tell the implementation how to interpret the data. |
| |
| New Procedures and Functions |
| |
| None. |
| |
| New Tokens |
| |
| Accepted as an attribute name in the <attrib_list> argument of |
| eglCreateImageKHR: |
| EGL_COLOR_COMPONENT_TYPE_EXT 0x3339 |
| |
| Accepted as attribute values for the EGL_COLOR_COMPONENT_TYPE_EXT attribute |
| of eglCreateImageKHR: |
| |
| EGL_COLOR_COMPONENT_TYPE_FIXED_EXT 0x333A |
| EGL_COLOR_COMPONENT_TYPE_FLOAT_EXT 0x333B |
| EGL_COLOR_COMPONENT_TYPE_UNSIGNED_INTEGER_ARM 0x3287 |
| EGL_COLOR_COMPONENT_TYPE_INTEGER_ARM 0x3288 |
| EGL_RED_SIZE 0x3024 |
| EGL_GREEN_SIZE 0x3023 |
| EGL_BLUE_SIZE 0x3022 |
| EGL_ALPHA_SIZE 0x3021 |
| |
| Modifications to the EGL 1.4 Specification |
| |
| Add the following rows to Table 3.xx: Legal attributes for |
| eglCreateImageKHR <attrib_list> parameter: |
| |
| +------------------------------+------------------------------+-----------+---------------+ |
| | Attribute | Description | Valid | Default Value | |
| | | | <target>s | | |
| +------------------------------+------------------------------+-----------+---------------+ |
| | EGL_COLOR_COMPONENT_TYPE_EXT | Specifies the component | All | NA | |
| | | type the EGLImage source | | | |
| | | is interpreted as | | | |
| | EGL_RED_SIZE | Specifies the red component | All | NA | |
| | | size the EGLImage source | | | |
| | | is interpreted as | | | |
| | EGL_GREEN_SIZE | Specifies the green component| All | NA | |
| | | size the EGLImage source | | | |
| | | is interpreted as | | | |
| | EGL_BLUE_SIZE | Specifies the blue component | All | NA | |
| | | size the EGLImage source | | | |
| | | is interpreted as | | | |
| | EGL_ALPHA_SIZE | Specifies the alpha component| All | NA | |
| | | size the EGLImage source | | | |
| | | is interpreted as | | | |
| +------------------------------+------------------------------+-----------+---------------+ |
| |
| If <attrib_list> specifies values for EGL_COLOR_COMPONENT_TYPE_EXT, |
| EGL_RED_SIZE, EGL_GREEN_SIZE, EGL_BLUE_SIZE, or EGL_ALPHA_SIZE, the |
| implementation will treat these as hints for how to interpret the contents |
| of <buffer>. |
| |
| EGL_COLOR_COMPONENT_TYPE_EXT indicates the component type of <buffer> and |
| must be either EGL_COLOR_COMPONENT_TYPE_FIXED_EXT for fixed-point, |
| EGL_COLOR_COMPONENT_TYPE_FLOAT_EXT for floating-point, |
| EGL_COLOR_COMPONENT_TYPE_UNSIGNED_INTEGER_ARM for unsigned integer, or |
| EGL_COLOR_COMPONENT_TYPE_INTEGER_ARM for integer components. |
| |
| Add to the list of error conditions for eglCreateImageKHR: |
| |
| * If the implementation is unable to interpret the contents <buffer> |
| according to the component types and sizes in <attrib_list>, then a |
| EGL_BAD_MATCH error is generated. |
| |
| Issues |
| |
| 1. Should there be a way to specify the component order? |
| |
| Resolved. No, the component order is interpreted to be R, G, B, A, |
| with R mapping to component 0. If the application needs a different |
| component order it can use swizzle in the client API side or in the |
| shader. |
| |
| Revision History |
| |
| Version 1, 2020/02/18 |
| - Internal revisions |
