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svga: try to avoid index generation for some primitive types 

The svga device doesn't directly support quads, quad strips or polygons
so we have to convert those types to indexed triangle lists.  But we
can sometimes avoid that if we're drawing flat/constant-colored prims
and we don't have to worry about provoking vertex.

Reviewed-by: Charmaine Lee <charmainel@vmware.com>
Reviewed-by: José Fonseca <jfonseca@vmware.com>
This commit is contained in:
Brian Paul 2015-10-16 16:14:46 -06:00
parent 129d34da49
commit 99effaa965
1 changed files with 14 additions and 0 deletions
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14
src/gallium/drivers/svga/svga_draw_arrays.c
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@ -218,6 +218,20 @@ svga_hwtnl_draw_arrays(struct svga_hwtnl *hwtnl,
* the hardware wants.
*/
api_pv = hwtnl->hw_pv;
if (hwtnl->api_fillmode == PIPE_POLYGON_MODE_FILL) {
/* Do some simple primitive conversions to avoid index buffer
* generation below. Note that polygons and quads are not directly
* supported by the svga device. Also note, we can only do this
* for flat/constant-colored rendering because of provoking vertex.
*/
if (prim == PIPE_PRIM_POLYGON) {
prim = PIPE_PRIM_TRIANGLE_FAN;
}
else if (prim == PIPE_PRIM_QUADS && count == 4) {
prim = PIPE_PRIM_TRIANGLE_FAN;
}
}
}
if (hwtnl->api_fillmode != PIPE_POLYGON_MODE_FILL &&