From 237880463d5168cad8df0bae6018b5fd76617777 Mon Sep 17 00:00:00 2001 From: Marek Olšák Date: Sun, 19 Dec 2010 02:54:43 +0100 Subject: r300g: optimize the fallback for misaligned ushort indices --- src/gallium/drivers/r300/r300_render.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) (limited to 'src/gallium/drivers/r300/r300_render.c') diff --git a/src/gallium/drivers/r300/r300_render.c b/src/gallium/drivers/r300/r300_render.c index b4197e0352..1d26eb9f91 100644 --- a/src/gallium/drivers/r300/r300_render.c +++ b/src/gallium/drivers/r300/r300_render.c @@ -551,7 +551,27 @@ static void r300_draw_range_elements(struct pipe_context* pipe, &start, count); r300_update_derived_state(r300); - r300_upload_index_buffer(r300, &indexBuffer, indexSize, start, count, &new_offset); + + /* Fallback for misaligned ushort indices. */ + if (indexSize == 2 && start % 2 == 1) { + struct pipe_transfer *transfer; + struct pipe_resource *userbuf; + uint16_t *ptr = pipe_buffer_map(pipe, indexBuffer, + PIPE_TRANSFER_READ, &transfer); + + /* Copy the mapped index buffer directly to the upload buffer. + * The start index will be aligned simply from the fact that + * every sub-buffer in u_upload_mgr is aligned. */ + userbuf = pipe->screen->user_buffer_create(pipe->screen, + ptr + start, count * 2, + PIPE_BIND_INDEX_BUFFER); + indexBuffer = userbuf; + r300_upload_index_buffer(r300, &indexBuffer, indexSize, 0, count, &new_offset); + pipe_resource_reference(&userbuf, NULL); + pipe_buffer_unmap(pipe, indexBuffer, transfer); + } else { + r300_upload_index_buffer(r300, &indexBuffer, indexSize, start, count, &new_offset); + } start = new_offset; -- cgit v1.2.3