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