Instead create a staging texture with pipe_buffer_create and PIPE_USAGE_STAGING.
u_upload_mgr sets the usage of its staging buffer to PIPE_USAGE_STREAM. But since 150ac07b855b5c5f879bf6ce9ca421ccd1a6c938 CPU -> GPU streaming buffers are created in VRAM. Therefore the staging texture (in VRAM) does not offer any performance improvements for buffer downloads. Signed-off-by: Niels Ole Salscheider <[email protected]> --- src/gallium/drivers/radeon/r600_buffer_common.c | 20 ++++++++------------ 1 file changed, 8 insertions(+), 12 deletions(-) diff --git a/src/gallium/drivers/radeon/r600_buffer_common.c b/src/gallium/drivers/radeon/r600_buffer_common.c index 22bc97e..ee05776 100644 --- a/src/gallium/drivers/radeon/r600_buffer_common.c +++ b/src/gallium/drivers/radeon/r600_buffer_common.c @@ -303,26 +303,22 @@ static void *r600_buffer_transfer_map(struct pipe_context *ctx, !(usage & PIPE_TRANSFER_WRITE) && rbuffer->domains == RADEON_DOMAIN_VRAM && r600_can_dma_copy_buffer(rctx, 0, box->x, box->width)) { - unsigned offset; - struct r600_resource *staging = NULL; - - u_upload_alloc(rctx->uploader, 0, - box->width + (box->x % R600_MAP_BUFFER_ALIGNMENT), - &offset, (struct pipe_resource**)&staging, (void**)&data); + struct r600_resource *staging; + staging = (struct r600_resource*) pipe_buffer_create( + ctx->screen, PIPE_BIND_TRANSFER_READ, PIPE_USAGE_STAGING, + box->width + (box->x % R600_MAP_BUFFER_ALIGNMENT)); if (staging) { - data += box->x % R600_MAP_BUFFER_ALIGNMENT; - /* Copy the VRAM buffer to the staging buffer. */ rctx->dma_copy(ctx, &staging->b.b, 0, - offset + box->x % R600_MAP_BUFFER_ALIGNMENT, + box->x % R600_MAP_BUFFER_ALIGNMENT, 0, 0, resource, level, box); - /* Just do the synchronization. The buffer is mapped already. */ - r600_buffer_map_sync_with_rings(rctx, staging, PIPE_TRANSFER_READ); + data = r600_buffer_map_sync_with_rings(rctx, staging, PIPE_TRANSFER_READ); + data += box->x % R600_MAP_BUFFER_ALIGNMENT; return r600_buffer_get_transfer(ctx, resource, level, usage, box, - ptransfer, data, staging, offset); + ptransfer, data, staging, 0); } } -- 2.0.4 _______________________________________________ mesa-dev mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-dev
