Mesa (main): pan/bi: Force psiz to mediump

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Module: Mesa
Branch: main
Commit: 8e6f97b5fc1444aa66f0b34c9cb2e01275189e48
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8e6f97b5fc1444aa66f0b34c9cb2e01275189e48

Author: Alyssa Rosenzweig <alyssa at collabora.com>
Date:   Thu Feb  3 16:16:36 2022 -0500

pan/bi: Force psiz to mediump

To match driver behaviour.

Signed-off-by: Alyssa Rosenzweig <alyssa at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15793>

---

 src/panfrost/bifrost/bifrost_compile.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/panfrost/bifrost/bifrost_compile.c b/src/panfrost/bifrost/bifrost_compile.c
index b801503e8d3..65dec9f52f7 100644
--- a/src/panfrost/bifrost/bifrost_compile.c
+++ b/src/panfrost/bifrost/bifrost_compile.c
@@ -4349,6 +4349,12 @@ bi_finalize_nir(nir_shader *nir, unsigned gpu_id, bool is_blend)
         if (nir->info.stage == MESA_SHADER_VERTEX) {
                 NIR_PASS_V(nir, nir_lower_viewport_transform);
                 NIR_PASS_V(nir, nir_lower_point_size, 1.0, 0.0);
+
+                nir_variable *psiz = nir_find_variable_with_location(nir,
+                                                                     nir_var_shader_out,
+                                                                     VARYING_SLOT_PSIZ);
+                if (psiz != NULL)
+                        psiz->data.precision = GLSL_PRECISION_MEDIUM;
         }
 
         /* Lower large arrays to scratch and small arrays to bcsel (TODO: tune