Name MESA_drm_image_formats Name Strings EGL_MESA_drm_image_formats Contributors Nicolai Hähnle Qiang Yu Contact Nicolai Hähnle Status Proposal Version Version 1, January 26, 2017 Number EGL Extension #?? Dependencies This extension requires the EGL_MESA_drm_image extension. This extension is written against the wording of EGL_MESA_drm_image specification. Overview This extension extends the functionality of EGL_MESA_drm_image by adding additional formats required by Glamor for use with DRM buffers. IP Status Open-source; freely implementable. New Procedures and Functions None New Tokens Accepted as values for the EGL_IMAGE_FORMAT_MESA attribute: EGL_DRM_BUFFER_FORMAT_ARGB2101010_MESA 0x3290 EGL_DRM_BUFFER_FORMAT_ARGB1555_MESA 0x3291 EGL_DRM_BUFFER_FORMAT_RGB565_MESA 0x3292 Additions to the EGL_MESA_drm_image Specification: Remove the sentence "The only format specified ..." from the paragraph describing eglCreateDRMImageMESA and add the following paragraph: The formats specified for use with EGL_DRM_BUFFER_FORMAT_MESA are: * EGL_DRM_BUFFER_FORMAT_ARGB32_MESA, where each pixel is a CPU-endian 32-bit quantity, with alpha in the upper 8 bits, then red, then green, then blue, * EGL_DRM_BUFFER_FORMAT_ARGB2101010_MESA, where each pixel is a CPU- endian, 32-bit quantity, with alpha in the most significant 2 bits, followed by 10 bits each for red, green, and blue, * EGL_DRM_BUFFER_FORMAT_ARGB1555_MESA, where each pixel is a CPU-endian 16-bit quantity, with alpha in the most significant bit, followed by 5 bits each for red, green, and blue, and * EGL_DRM_BUFFER_FORMAT_RGB565_MESA, where each pixel is a CPU-endian 16-bit quantity, with red in the 5 most significant bits, followed by 6 bits of green and 5 bits of blue. Issues 1. Should we expose the full set of channel permutations for the formats, e.g. ABGR2101010, RGBA1010102, and BGRA1010102 in addition to ARGB2101010? RESOLVED: No. DISCUSSION: The original extension sets a precedent of only exposing one of the possible permutations of 8-bit channel formats. It is also not clear where the additional permutations would be used. For example, Glamor has a fixed mapping from pixmap/screen depth to format that doesn't allow for the other permutations. Revision History Version 1, January, 2017 Initial draft (Nicolai Hähnle)