Mesa (main): virgl: Don't support QUADS natively

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Module: Mesa
Branch: main
Commit: 492401c054cf60b660b6cc0062087cb82652fd27
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=492401c054cf60b660b6cc0062087cb82652fd27

Author: Gert Wollny <gert.wollny at collabora.com>
Date:   Thu Mar 31 09:23:36 2022 +0200

virgl: Don't support QUADS natively

Using quads leads to a rather expensive buffer readback when quads
are stored in display lists, so avoid them altogether.

Closes: #5825

Signed-off-by: Gert Wollny <gert.wollny at collabora.com>
Reviewed-by: Italo Nicola <italonicola at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15683>

---

 src/gallium/drivers/virgl/virgl_screen.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gallium/drivers/virgl/virgl_screen.c b/src/gallium/drivers/virgl/virgl_screen.c
index ed0898dab02..d4024994575 100644
--- a/src/gallium/drivers/virgl/virgl_screen.c
+++ b/src/gallium/drivers/virgl/virgl_screen.c
@@ -133,6 +133,10 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
       return 16*4;
+   case PIPE_CAP_SUPPORTED_PRIM_MODES:
+      return BITFIELD_MASK(PIPE_PRIM_MAX) &
+            ~BITFIELD_BIT(PIPE_PRIM_QUADS) &
+            ~BITFIELD_BIT(PIPE_PRIM_QUAD_STRIP);
    case PIPE_CAP_PRIMITIVE_RESTART:
    case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
       return vscreen->caps.caps.v1.bset.primitive_restart;