uxa: Use temporary dest when target is too large for compositor

If the destination cannot fit into the 3D pipeline when we need to
composite, we fallback to doing the operation on the CPU. This is very
slow, and quite easy to trigger on i915 by plugging in an external
display.

An alternative is to extract the extents of the operation from the
destination using the blitter which can usually handle much larger
operations. This gives us a temporary target that can fit into the 3D
pipeline and thus be accelerated, before copying back into the larger
real destination.

For x11perf this boosts glyph rendering on PineView, from 38kglyphs/s to
480kglyphs/s. Just a little shy of the native performance of 601kglyphs/s

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 11 insertions, 6 deletions

diff --git a/src/i830.h b/src/i830.h
index f8aa824e..229a4e68 100644
--- a/src/i830.h
+++ b/src/i830.h
@@ -469,8 +469,10 @@ void i830_set_gem_max_sizes(ScrnInfoPtr scrn);
 drm_intel_bo *i830_allocate_framebuffer(ScrnInfoPtr scrn);
 
 /* i830_render.c */
-Bool i830_check_composite(int op, PicturePtr source, PicturePtr mask,
-			  PicturePtr dest);
+Bool i830_check_composite(int op,
+			  PicturePtr sourcec, PicturePtr mask, PicturePtr dest,
+			  int width, int height);
+Bool i830_check_composite_target(PixmapPtr pixmap);
 Bool i830_check_composite_texture(ScreenPtr screen, PicturePtr picture);
 Bool i830_prepare_composite(int op, PicturePtr sourcec, PicturePtr mask,
 			    PicturePtr dest, PixmapPtr sourcecPixmap,
@@ -481,8 +483,10 @@ void i830_composite(PixmapPtr dest, int srcX, int srcY,
 		    int maskX, int maskY, int dstX, int dstY, int w, int h);
 void i830_done_composite(PixmapPtr dest);
 /* i915_render.c */
-Bool i915_check_composite(int op, PicturePtr sourcec, PicturePtr mask,
-			  PicturePtr dest);
+Bool i915_check_composite(int op,
+			  PicturePtr sourcec, PicturePtr mask, PicturePtr dest,
+			  int width, int height);
+Bool i915_check_composite_target(PixmapPtr pixmap);
 Bool i915_check_composite_texture(ScreenPtr screen, PicturePtr picture);
 Bool i915_prepare_composite(int op, PicturePtr sourcec, PicturePtr mask,
 			    PicturePtr dest, PixmapPtr sourcecPixmap,
@@ -496,8 +500,9 @@ void i830_batch_flush_notify(ScrnInfoPtr scrn);
 unsigned int gen4_render_state_size(ScrnInfoPtr scrn);
 void gen4_render_state_init(ScrnInfoPtr scrn);
 void gen4_render_state_cleanup(ScrnInfoPtr scrn);
-Bool i965_check_composite(int op, PicturePtr sourcec, PicturePtr mask,
-			  PicturePtr dest);
+Bool i965_check_composite(int op,
+			  PicturePtr sourcec, PicturePtr mask, PicturePtr dest,
+			  int width, int height);
 Bool i965_check_composite_texture(ScreenPtr screen, PicturePtr picture);
 Bool i965_prepare_composite(int op, PicturePtr sourcec, PicturePtr mask,
 			    PicturePtr dest, PixmapPtr sourcecPixmap,