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i915g: Add the nice cube map layout comments from i915c.

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11648>
This commit is contained in:
Emma Anholt
2021-06-29 19:50:26 -07:00
committed by Marge Bot
parent 33e9143faf
commit 99fccbee48
1 changed files with 100 additions and 0 deletions
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src/gallium/drivers/i915/i915_resource_texture.c
+100
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@@ -278,6 +278,47 @@ i9x5_special_layout(struct i915_texture *tex)
/**
* Cube layout used on i915 and for non-compressed textures on i945.
*
* Hardware layout looks like:
*
* +-------+-------+
* | | |
* | | |
* | | |
* | +x | +y |
* | | |
* | | |
* | | |
* | | |
* +---+---+-------+
* | | | |
* | +x| +y| |
* | | | |
* | | | |
* +-+-+---+ +z |
* | | | | |
* +-+-+ +z| |
* | | | |
* +-+-+---+-------+
* | | |
* | | |
* | | |
* | -x | -y |
* | | |
* | | |
* | | |
* | | |
* +---+---+-------+
* | | | |
* | -x| -y| |
* | | | |
* | | | |
* +-+-+---+ -z |
* | | | | |
* +-+-+ -z| |
* | | | |
* +-+---+-------+
*
*/
static void
i9x5_texture_layout_cube(struct i915_texture *tex)
@@ -537,6 +578,65 @@ i945_texture_layout_3d(struct i915_texture *tex)
}
}
/**
* Compressed cube texture map layout for i945 and later.
*
* The hardware layout looks like the 830-915 layout, except for the small
* sizes. A zoomed in view of the layout for 945 is:
*
* +-------+-------+
* | 8x8 | 8x8 |
* | | |
* | | |
* | +x | +y |
* | | |
* | | |
* | | |
* | | |
* +---+---+-------+
* |4x4| | 8x8 |
* | +x| | |
* | | | |
* | | | |
* +---+ | +z |
* |4x4| | |
* | +y| | |
* | | | |
* +---+ +-------+
*
* ...
*
* +-------+-------+
* | 8x8 | 8x8 |
* | | |
* | | |
* | -x | -y |
* | | |
* | | |
* | | |
* | | |
* +---+---+-------+
* |4x4| | 8x8 |
* | -x| | |
* | | | |
* | | | |
* +---+ | -z |
* |4x4| | |
* | -y| | |
* | | | |
* +---+ +---+---+---+---+---+---+---+---+---+
* |4x4| |4x4| |2x2| |2x2| |2x2| |2x2|
* | +z| | -z| | +x| | +y| | +z| | -x| ...
* | | | | | | | | | | | |
* +---+ +---+ +---+ +---+ +---+ +---+
*
* The bottom row continues with the remaining 2x2 then the 1x1 mip contents
* in order, with each of them aligned to a 8x8 block boundary. Thus, for
* 32x32 cube maps and smaller, the bottom row layout is going to dictate the
* pitch of the tree. For a tree with 4x4 images, the pitch is at least
* 14 * 8 = 112 texels, for 2x2 it is at least 12 * 8 texels, and for 1x1
* it is 6 * 8 texels.
*/
static void
i945_texture_layout_cube(struct i915_texture *tex)
{