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mesa: avoid reading back textures from VRAM

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This can be very slow on dGPU.

I tried a different version that would allocate a full row
and then do a single memcpy per row but the performance
was similar so I kept the simple version.

Cc: mesa-stable

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18484>
(cherry picked from commit a5b1a811053eef74e8e0353ebbe2bb9c68e5c26b)
This commit is contained in:
Pierre-Eric Pelloux-Prayer 2022-09-08 09:47:59 +02:00 committed by Dylan Baker
parent 2c56768a2f
commit 6ce21ce910
2 changed files with 5 additions and 3 deletions
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2
.pick_status.json
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@ -526,7 +526,7 @@
"description": "mesa: avoid reading back textures from VRAM",
"nominated": true,
"nomination_type": 0,
"resolution": 0,
"resolution": 1,
"main_sha": null,
"because_sha": null
},

6
src/mesa/main/texstore.c
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@ -449,7 +449,7 @@ _mesa_texstore_s8_z24(TEXSTORE_PARAMS)
/* the 24 depth bits will be in the low position: */
_mesa_unpack_depth_span(ctx, srcWidth,
GL_UNSIGNED_INT, /* dst type */
keepstencil ? depth : dstRow, /* dst addr */
depth, /* dst addr */
depthScale,
srcType, src, srcPacking);
@ -463,7 +463,9 @@ _mesa_texstore_s8_z24(TEXSTORE_PARAMS)
/* merge stencil values into depth values */
for (i = 0; i < srcWidth; i++) {
if (keepstencil)
if (!keepstencil && !keepdepth)
dstRow[i] = depth[i] | (stencil[i] << 24);
else if (keepstencil)
dstRow[i] = depth[i] | (dstRow[i] & 0xFF000000);
else
dstRow[i] = (dstRow[i] & 0xFFFFFF) | (stencil[i] << 24);