st/xa: scissor to help tilers

Keep track of the maximal bounds of all the operations and set scissor
accordingly.  For tiling GPU's this can be a big win by reducing the
memory bandwidth spent moving pixels from system memory to tile buffer
and back.

You could imagine being more sophisticated and splitting up disjoint
operations.  But this simplistic approach is good enough for the common
cases.

Signed-off-by: Rob Clark <robclark@freedesktop.org>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/gallium/state_trackers/xa/xa_context.c b/src/gallium/state_trackers/xa/xa_context.c
index ee32676..867999a 100644
--- a/src/gallium/state_trackers/xa/xa_context.c
+++ b/src/gallium/state_trackers/xa/xa_context.c
@@ -238,6 +238,8 @@ xa_copy(struct xa_context *ctx,
 {
     struct pipe_box src_box;
 
+    xa_scissor_update(ctx, dx, dy, dx + width, dy + height);
+
     if (ctx->simple_copy) {
 	u_box_2d(sx, sy, width, height, &src_box);
 	ctx->pipe->resource_copy_region(ctx->pipe,
@@ -324,6 +326,7 @@ xa_solid_prepare(struct xa_context *ctx, struct xa_surface *dst,
 XA_EXPORT void
 xa_solid(struct xa_context *ctx, int x, int y, int width, int height)
 {
+    xa_scissor_update(ctx, x, y, x + width, y + height);
     renderer_solid(ctx, x, y, x + width, y + height, ctx->solid_color);
 }