[Mesa-dev] [PATCH 09/18] radeonsi: fix UNSIGNED_BYTE index buffer fallback with non-zero start

[Marek Olšák]

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

start can only be non-zero with MultiDrawElements, which is unlikely
to occur with UNSIGNED_BYTE indices.
---
 src/gallium/drivers/radeonsi/si_state_draw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gallium/drivers/radeonsi/si_state_draw.c b/src/gallium/drivers/radeonsi/si_state_draw.c
index d453309..8f5dcbc 100644
--- a/src/gallium/drivers/radeonsi/si_state_draw.c
+++ b/src/gallium/drivers/radeonsi/si_state_draw.c
@@ -1045,21 +1045,21 @@ void si_draw_vbo(struct pipe_context *ctx, const struct pipe_draw_info *info)
 		ib.offset = sctx->index_buffer.offset;
 
 		/* Translate or upload, if needed. */
 		/* 8-bit indices are supported on VI. */
 		if (sctx->b.chip_class <= CIK && ib.index_size == 1) {
 			struct pipe_resource *out_buffer = NULL;
 			unsigned out_offset, start, count, start_offset;
 			void *ptr;
 
 			si_get_draw_start_count(sctx, info, &start, &count);
-			start_offset = start * ib.index_size;
+			start_offset = start * 2;
 
 			u_upload_alloc(ctx->stream_uploader, start_offset,
                                        count * 2, 256,
 				       &out_offset, &out_buffer, &ptr);
 			if (!out_buffer) {
 				pipe_resource_reference(&ib.buffer, NULL);
 				return;
 			}
 
 			util_shorten_ubyte_elts_to_userptr(&sctx->b.b, &ib, 0,
-- 
2.7.4