Mesa (master): zink: respect fragment-shader depth-layout

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Module: Mesa
Branch: master
Commit: 45bebc7a9c73f3add08c2290fa1eac237edf5a34
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=45bebc7a9c73f3add08c2290fa1eac237edf5a34

Author: Erik Faye-Lund <erik.faye-lund at collabora.com>
Date:   Fri Jan 22 11:42:18 2021 +0100

zink: respect fragment-shader depth-layout

This is required by GLSL 1.30 and later, so we should also respect the
setting.

Fixes: 6785d8c4601 ("zink: expose GLSL 1.30")
Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8644>

---

 src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c b/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
index 8d3d1cddc8b..2fb7babb023 100644
--- a/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
+++ b/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
@@ -3127,6 +3127,24 @@ get_output_prim_type_mode(uint16_t type)
    return 0;
 }
 
+static SpvExecutionMode
+get_depth_layout_mode(enum gl_frag_depth_layout depth_layout)
+{
+   switch (depth_layout) {
+   case FRAG_DEPTH_LAYOUT_NONE:
+   case FRAG_DEPTH_LAYOUT_ANY:
+      return SpvExecutionModeDepthReplacing;
+   case FRAG_DEPTH_LAYOUT_GREATER:
+      return SpvExecutionModeDepthGreater;
+   case FRAG_DEPTH_LAYOUT_LESS:
+      return SpvExecutionModeDepthLess;
+   case FRAG_DEPTH_LAYOUT_UNCHANGED:
+      return SpvExecutionModeDepthUnchanged;
+   default:
+      unreachable("unexpected depth layout");
+   }
+}
+
 struct spirv_shader *
 nir_to_spirv(struct nir_shader *s, const struct zink_so_info *so_info,
              unsigned char *shader_slot_map, unsigned char *shader_slots_reserved)
@@ -3275,7 +3293,7 @@ nir_to_spirv(struct nir_shader *s, const struct zink_so_info *so_info,
                                    SpvExecutionModeOriginUpperLeft);
       if (s->info.outputs_written & BITFIELD64_BIT(FRAG_RESULT_DEPTH))
          spirv_builder_emit_exec_mode(&ctx.builder, entry_point,
-                                      SpvExecutionModeDepthReplacing);
+                                      get_depth_layout_mode(s->info.fs.depth_layout));
       if (s->info.fs.early_fragment_tests)
          spirv_builder_emit_exec_mode(&ctx.builder, entry_point, SpvExecutionModeEarlyFragmentTests);
       break;