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render: export TriStrip and TriFan to the drivers

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Rather than perform an intermediate copy and expand the strip and the
fan into a triangle list (thereby tripling the number of edges that the
driver needs to process), allow the backend to hook directly into the
appropriate Composite function.

In order to extend the PictureScreen, without needlessly bumping the
ABI, we move the existing copy implementations to mipict.c and assign
those by default. To notify the ddx that the new entry points are
available, we introduce PICTURE_SCREEN_VERSION.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Aaron Plattner <aplattner@nvidia.com>
This commit is contained in:
Chris Wilson
2011-09-04 09:34:08 -07:00
committed by Aaron Plattner
parent 9b26e6bc8d
commit 525d4172b2
4 changed files with 114 additions and 32 deletions
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61
render/mipict.c
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@@ -569,6 +569,64 @@ miRenderPixelToColor (PictFormatPtr format,
}
}
void
miTriStrip (CARD8 op,
PicturePtr pSrc,
PicturePtr pDst,
PictFormatPtr maskFormat,
INT16 xSrc,
INT16 ySrc,
int npoints,
xPointFixed *points)
{
xTriangle *tris, *tri;
int ntri;
ntri = npoints - 2;
tris = malloc(ntri * sizeof (xTriangle));
if (!tris)
return;
for (tri = tris; npoints >= 3; npoints--, points++, tri++)
{
tri->p1 = points[0];
tri->p2 = points[1];
tri->p3 = points[2];
}
CompositeTriangles (op, pSrc, pDst, maskFormat, xSrc, ySrc, ntri, tris);
free(tris);
}
void
miTriFan (CARD8 op,
PicturePtr pSrc,
PicturePtr pDst,
PictFormatPtr maskFormat,
INT16 xSrc,
INT16 ySrc,
int npoints,
xPointFixed *points)
{
xTriangle *tris, *tri;
xPointFixed *first;
int ntri;
ntri = npoints - 2;
tris = malloc(ntri * sizeof (xTriangle));
if (!tris)
return;
first = points++;
for (tri = tris; npoints >= 3; npoints--, points++, tri++)
{
tri->p1 = *first;
tri->p2 = points[0];
tri->p3 = points[1];
}
CompositeTriangles (op, pSrc, pDst, maskFormat, xSrc, ySrc, ntri, tris);
free(tris);
}
Bool
miPictureInit (ScreenPtr pScreen, PictFormatPtr formats, int nformats)
{
@@ -602,5 +660,8 @@ miPictureInit (ScreenPtr pScreen, PictFormatPtr formats, int nformats)
ps->AddTraps = 0; /* requires DDX support */
ps->AddTriangles = 0; /* requires DDX support */
ps->TriStrip = miTriStrip; /* converts call to CompositeTriangles */
ps->TriFan = miTriFan;
return TRUE;
}