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authorMarek Olšák <maraeo@gmail.com>2010-12-19 02:54:43 +0100
committerMarek Olšák <maraeo@gmail.com>2010-12-19 04:05:34 +0100
commit237880463d5168cad8df0bae6018b5fd76617777 (patch)
tree074ba5ca428f075606c0dce67ac0abde3a3182ff /src/gallium
parentc87f82bc40f90fd3fe7af74ffa4d7784c7d1b6b1 (diff)
r300g: optimize the fallback for misaligned ushort indices
Diffstat (limited to 'src/gallium')
-rw-r--r--src/gallium/drivers/r300/r300_render.c22
-rw-r--r--src/gallium/drivers/r300/r300_render_translate.c2
2 files changed, 22 insertions, 2 deletions
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;
diff --git a/src/gallium/drivers/r300/r300_render_translate.c b/src/gallium/drivers/r300/r300_render_translate.c
index 41a43b04de..90b2f40be5 100644
--- a/src/gallium/drivers/r300/r300_render_translate.c
+++ b/src/gallium/drivers/r300/r300_render_translate.c
@@ -204,7 +204,7 @@ void r300_translate_index_buffer(struct r300_context *r300,
break;
case 2:
- if (*start % 2 != 0 || index_offset) {
+ if (index_offset) {
util_rebuild_ushort_elts(&r300->context, index_buffer, index_offset, *start, count);
*start = 0;
r300->validate_buffers = TRUE;