[Mesa-dev] [PATCH 8/9] radeonsi: always interpolate PrimID as flat

[Marek Olšák]

From: Marek Olšák <marek.olsak at amd.com>

---
 src/gallium/drivers/radeonsi/si_state_shaders.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index c26acbbc927..c4517fcf538 100644
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -2821,21 +2821,22 @@ static void si_delete_shader_selector(struct pipe_context *ctx, void *state)
 }
 
 static unsigned si_get_ps_input_cntl(struct si_context *sctx,
 				     struct si_shader *vs, unsigned name,
 				     unsigned index, unsigned interpolate)
 {
 	struct tgsi_shader_info *vsinfo = &vs->selector->info;
 	unsigned j, offset, ps_input_cntl = 0;
 
 	if (interpolate == TGSI_INTERPOLATE_CONSTANT ||
-	    (interpolate == TGSI_INTERPOLATE_COLOR && sctx->flatshade))
+	    (interpolate == TGSI_INTERPOLATE_COLOR && sctx->flatshade) ||
+	    name == TGSI_SEMANTIC_PRIMID)
 		ps_input_cntl |= S_028644_FLAT_SHADE(1);
 
 	if (name == TGSI_SEMANTIC_PCOORD ||
 	    (name == TGSI_SEMANTIC_TEXCOORD &&
 	     sctx->sprite_coord_enable & (1 << index))) {
 		ps_input_cntl |= S_028644_PT_SPRITE_TEX(1);
 	}
 
 	for (j = 0; j < vsinfo->num_outputs; j++) {
 		if (name == vsinfo->output_semantic_name[j] &&
-- 
2.17.1