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sna/accel: Add an compile option to disable use of spans 

Using spans has a tremendous effect (~100x) on x11perf, some good but
mostly bad. However, in reality operations are mixed and so preventing
migration on alternate opertaions is a win. In the x11perf slowdowns, it
appears to be CPU bound and so it seems like there should be plenty of
scope for recovering the lost performance.

However, for the time being, just go back to the old fallbacks.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-10-02 08:55:55 +01:00
parent dc1ec0dd1a
commit 32cef71efe
1 changed files with 5 additions and 3 deletions
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8
src/sna/sna_accel.c
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@ -57,6 +57,8 @@
#define FORCE_GPU_ONLY 0
#define FORCE_FALLBACK 0
#define USE_SPANS 0
DevPrivateKeyRec sna_pixmap_index;
#define PM_IS_SOLID(_draw, _pm) \
@ -2155,7 +2157,7 @@ sna_poly_line(DrawablePtr drawable, GCPtr gc,
return;
}
if (can_fill_spans(drawable, gc) &&
if (USE_SPANS && can_fill_spans(drawable, gc) &&
sna_drawable_use_gpu_bo(drawable, &extents)) {
DBG(("%s: converting line into spans\n", __FUNCTION__));
switch (gc->lineStyle) {
@ -2390,7 +2392,7 @@ sna_poly_segment(DrawablePtr drawable, GCPtr gc, int n, xSegment *seg)
}
/* XXX Do we really want to base this decision on the amalgam ? */
if (can_fill_spans(drawable, gc) &&
if (USE_SPANS && can_fill_spans(drawable, gc) &&
sna_drawable_use_gpu_bo(drawable, &extents)) {
void (*line)(DrawablePtr, GCPtr, int, int, DDXPointPtr);
int i;
@ -2515,7 +2517,7 @@ sna_poly_arc(DrawablePtr drawable, GCPtr gc, int n, xArc *arc)
}
/* For "simple" cases use the miPolyArc to spans path */
if (arc_to_spans(gc, n) && can_fill_spans(drawable, gc) &&
if (USE_SPANS && arc_to_spans(gc, n) && can_fill_spans(drawable, gc) &&
sna_drawable_use_gpu_bo(drawable, &extents)) {
DBG(("%s: converting arcs into spans\n", __FUNCTION__));
miPolyArc(drawable, gc, n, arc);