radeonsi: disallow compute-based culling if polygon mode is enabled

Polygon mode can generate thick points or lines.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3095>

src/gallium/drivers/radeonsi/si_state.c

@@ -919,6 +919,8 @@ static void *si_create_rs_state(struct pipe_context *ctx,
 	rs->flatshade_first = state->flatshade_first;
 	rs->sprite_coord_enable = state->sprite_coord_enable;
 	rs->rasterizer_discard = state->rasterizer_discard;
+	rs->polygon_mode_enabled = state->fill_front != PIPE_POLYGON_MODE_FILL ||
+				   state->fill_back != PIPE_POLYGON_MODE_FILL;
 	rs->pa_sc_line_stipple = state->line_stipple_enable ?
 				S_028A0C_LINE_PATTERN(state->line_stipple_pattern) |
 				S_028A0C_REPEAT_COUNT(state->line_stipple_factor) : 0;
@@ -976,8 +978,7 @@ static void *si_create_rs_state(struct pipe_context *ctx,
 		S_028814_POLY_OFFSET_FRONT_ENABLE(util_get_offset(state, state->fill_front)) |
 		S_028814_POLY_OFFSET_BACK_ENABLE(util_get_offset(state, state->fill_back)) |
 		S_028814_POLY_OFFSET_PARA_ENABLE(state->offset_point || state->offset_line) |
-		S_028814_POLY_MODE(state->fill_front != PIPE_POLYGON_MODE_FILL ||
-				   state->fill_back != PIPE_POLYGON_MODE_FILL) |
+		S_028814_POLY_MODE(rs->polygon_mode_enabled) |
 		S_028814_POLYMODE_FRONT_PTYPE(si_translate_fill(state->fill_front)) |
 		S_028814_POLYMODE_BACK_PTYPE(si_translate_fill(state->fill_back)));
 

src/gallium/drivers/radeonsi/si_state.h

@@ -94,6 +94,7 @@ struct si_state_rasterizer {
 	unsigned		cull_back:1;
 	unsigned		depth_clamp_any:1;
 	unsigned		provoking_vertex_first:1;
+	unsigned		polygon_mode_enabled:1;
 };
 
 struct si_dsa_stencil_ref_part {

src/gallium/drivers/radeonsi/si_state_draw.c

@@ -1993,6 +1993,7 @@ static void si_draw_vbo(struct pipe_context *ctx, const struct pipe_draw_info *i
 	    (!sctx->tes_shader.cso || pd_msg("uses tess")) &&
 	    (!sctx->gs_shader.cso || pd_msg("uses GS")) &&
 	    (!sctx->ps_shader.cso->info.uses_primid || pd_msg("PS uses PrimID")) &&
+	    !rs->polygon_mode_enabled &&
 #if SI_PRIM_DISCARD_DEBUG /* same as cso->prim_discard_cs_allowed */
 	    (!sctx->vs_shader.cso->info.uses_bindless_images || pd_msg("uses bindless images")) &&
 	    (!sctx->vs_shader.cso->info.uses_bindless_samplers || pd_msg("uses bindless samplers")) &&