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radeon: use staging for mapping linear textures

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Textures that likely reside in VRAM, are mapped for reading and
don't require direct mapping should be staged into GTT, to avoid bad
performance. This fixes readback performance of VDPAU surfaces.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Grigori Goronzy 2013-10-13 18:08:44 +02:00 • committed by Christian König
parent 270fab5164
commit f250fd59c4
1 changed files with 6 additions and 0 deletions
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6
src/gallium/drivers/radeon/r600_texture.c
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@ -852,6 +852,12 @@ static void *r600_texture_transfer_map(struct pipe_context *ctx,
if (rtex->surface.level[level].mode >= RADEON_SURF_MODE_1D)
use_staging_texture = TRUE;
/* Untiled buffers in VRAM, which is slow for CPU reads */
if ((usage & PIPE_TRANSFER_READ) && !(usage & PIPE_TRANSFER_MAP_DIRECTLY) &&
(rtex->resource.domains == RADEON_DOMAIN_VRAM)) {
use_staging_texture = TRUE;
}
/* Use a staging texture for uploads if the underlying BO is busy. */
if (!(usage & PIPE_TRANSFER_READ) &&
(r600_rings_is_buffer_referenced(rctx, rtex->resource.cs_buf, RADEON_USAGE_READWRITE) ||