[Mesa-dev] [PATCH 2/6] radeonsi: fix unaligned clear_buffer fallback

[Marek Olšák]

From: Marek Olšák <marek.olsak at amd.com>

This is unreachable currently, but it will be used by unaligned 8-bit and
16-bit fills.
---
 src/gallium/drivers/radeonsi/si_cp_dma.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/gallium/drivers/radeonsi/si_cp_dma.c b/src/gallium/drivers/radeonsi/si_cp_dma.c
index 418b2cf..7b8c6d0 100644
--- a/src/gallium/drivers/radeonsi/si_cp_dma.c
+++ b/src/gallium/drivers/radeonsi/si_cp_dma.c
@@ -176,12 +176,14 @@ static void si_clear_buffer(struct pipe_context *ctx, struct pipe_resource *dst,
 
 	/* Fallback for unaligned clears. */
 	if (offset % 4 != 0 || size % 4 != 0) {
-		uint32_t *map = sctx->b.ws->buffer_map(r600_resource(dst)->cs_buf,
-						       sctx->b.rings.gfx.cs,
-						       PIPE_TRANSFER_WRITE);
-		size /= 4;
-		for (unsigned i = 0; i < size; i++)
-			*map++ = value;
+		uint8_t *map = sctx->b.ws->buffer_map(r600_resource(dst)->cs_buf,
+						      sctx->b.rings.gfx.cs,
+						      PIPE_TRANSFER_WRITE);
+		map += offset;
+		for (unsigned i = 0; i < size; i++) {
+			unsigned byte_within_dword = (offset + i) % 4;
+			*map++ = (value >> (byte_within_dword * 8)) & 0xff;
+		}
 		return;
 	}
 
-- 
2.1.4