broadcom/vc4: Scissor blits performed using the rendering engine.

Without this, a BlitFramebuffer would mark the whole framebuffer as being
changed (so we emit loads/stores of all of it) rather than just the
modified subset.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/gallium/drivers/vc4/vc4_blit.c b/src/gallium/drivers/vc4/vc4_blit.c
index 0e4ab5bfa0c..7f4c76968e7 100644
--- a/src/gallium/drivers/vc4/vc4_blit.c
+++ b/src/gallium/drivers/vc4/vc4_blit.c
@@ -195,6 +195,15 @@ vc4_render_blit(struct pipe_context *ctx, struct pipe_blit_info *info)
                 return false;
         }
 
+        /* Enable the scissor, so we get a minimal set of tiles rendered. */
+        if (!info->scissor_enable) {
+                info->scissor_enable = true;
+                info->scissor.minx = info->dst.box.x;
+                info->scissor.miny = info->dst.box.y;
+                info->scissor.maxx = info->dst.box.x + info->dst.box.width;
+                info->scissor.maxy = info->dst.box.y + info->dst.box.height;
+        }
+
         vc4_blitter_save(vc4);
         util_blitter_blit(vc4->blitter, info);