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>
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@ -218,6 +218,20 @@ svga_hwtnl_draw_arrays(struct svga_hwtnl *hwtnl,
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* the hardware wants.
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*/
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api_pv = hwtnl->hw_pv;
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if (hwtnl->api_fillmode == PIPE_POLYGON_MODE_FILL) {
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/* Do some simple primitive conversions to avoid index buffer
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* generation below. Note that polygons and quads are not directly
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* supported by the svga device. Also note, we can only do this
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* for flat/constant-colored rendering because of provoking vertex.
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*/
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if (prim == PIPE_PRIM_POLYGON) {
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prim = PIPE_PRIM_TRIANGLE_FAN;
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}
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else if (prim == PIPE_PRIM_QUADS && count == 4) {
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prim = PIPE_PRIM_TRIANGLE_FAN;
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}
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}
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}
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if (hwtnl->api_fillmode != PIPE_POLYGON_MODE_FILL &&
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