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st/mesa: only set primitive_restart when the restart index is in range

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Even when enabled, primitive restart has no effect when the restart index
is larger than the representable values in the index buffer.

Fixes GL45-CTS.gtf31.GL3Tests.primitive_restart.primitive_restart_upconvert
for radeonsi VI.

v2: add an explanatory comment

Cc: "12.0 13.0" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Marek Olšák <marek.olsak@amd.com> (v1)
(cherry picked from commit bfa50f88ce)
This commit is contained in:
Nicolai Hähnle 2016-10-19 18:14:48 +02:00 • committed by Emil Velikov
parent 13f685cf11
commit ba6efd48c3
1 changed files with 13 additions and 2 deletions
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15
src/mesa/state_tracker/st_draw.c
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@ -205,8 +205,19 @@ st_draw_vbo(struct gl_context *ctx,
/* The VBO module handles restart for the non-indexed GLDrawArrays
* so we only set these fields for indexed drawing:
*/
info.primitive_restart = ctx->Array._PrimitiveRestart;
info.restart_index = _mesa_primitive_restart_index(ctx, ib->type);
if (ctx->Array._PrimitiveRestart) {
info.restart_index = _mesa_primitive_restart_index(ctx, ib->type);
/* Enable primitive restart only when the restart index can have an
* effect. This is required for correctness in radeonsi VI support,
* though other hardware may also benefit from taking a faster,
* non-restart path when possible.
*/
if ((ibuffer.index_size >= 4) ||
(ibuffer.index_size >= 2 && info.restart_index <= 0xffff) ||
(info.restart_index <= 0xff))
info.primitive_restart = true;
}
}
else {
/* Transform feedback drawing is always non-indexed. */