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authorMarek Olšák <[email protected]>2011-12-24 11:43:10 +0100
committerMarek Olšák <[email protected]>2011-12-24 21:28:43 +0100
commitec4851253bbf7fd7d11c5570f19f9733a885e471 (patch)
treeec1af7e40b0b00b9f3dd81dc57ebc837a6093778
parent93f4e3cb6c1ca303ee1f5c2a2491a8eff33f2633 (diff)
r300g: mapping buffers for read should be unsynchronized
The GPU never uses them for write.
-rw-r--r--src/gallium/drivers/r300/r300_screen_buffer.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/src/gallium/drivers/r300/r300_screen_buffer.c b/src/gallium/drivers/r300/r300_screen_buffer.c
index a8392d2dc52..2e9e7d7f408 100644
--- a/src/gallium/drivers/r300/r300_screen_buffer.c
+++ b/src/gallium/drivers/r300/r300_screen_buffer.c
@@ -107,13 +107,21 @@ r300_buffer_transfer_map( struct pipe_context *pipe,
struct radeon_winsys *rws = r300screen->rws;
struct r300_resource *rbuf = r300_resource(transfer->resource);
uint8_t *map;
+ enum pipe_transfer_usage usage;
if (rbuf->b.user_ptr)
return (uint8_t *) rbuf->b.user_ptr + transfer->box.x;
if (rbuf->constant_buffer)
return (uint8_t *) rbuf->constant_buffer + transfer->box.x;
- map = rws->buffer_map(rbuf->buf, r300->cs, transfer->usage);
+ /* Buffers are never used for write, therefore mapping for read can be
+ * unsynchronized. */
+ usage = transfer->usage;
+ if (!(usage & PIPE_TRANSFER_WRITE)) {
+ usage |= PIPE_TRANSFER_UNSYNCHRONIZED;
+ }
+
+ map = rws->buffer_map(rbuf->buf, r300->cs, usage);
if (map == NULL)
return NULL;