radv: Move radv_nir_lower_viewport_to_zero to new file.

Also ran clang-format on the affected code.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21971>

src/amd/vulkan/meson.build

@@ -78,6 +78,7 @@ libradv_files = files(
   'nir/radv_nir_lower_primitive_shading_rate.c',
   'nir/radv_nir_lower_ray_queries.c',
   'nir/radv_nir_lower_view_index.c',
+  'nir/radv_nir_lower_viewport_to_zero.c',
   'nir/radv_nir_lower_vs_inputs.c',
   'winsys/null/radv_null_bo.c',
   'winsys/null/radv_null_bo.h',

src/amd/vulkan/nir/radv_nir.h

@@ -66,6 +66,8 @@ bool radv_nir_lower_intrinsics_early(nir_shader *nir, const struct radv_pipeline
 
 bool radv_nir_lower_view_index(nir_shader *nir, bool per_primitive);
 
+bool radv_nir_lower_viewport_to_zero(nir_shader *nir);
+
 #ifdef __cplusplus
 }
 #endif

src/amd/vulkan/nir/radv_nir_lower_viewport_to_zero.c

@@ -0,0 +1,69 @@
+/*
+ * Copyright © 2016 Red Hat.
+ * Copyright © 2016 Bas Nieuwenhuizen
+ * Copyright © 2023 Valve Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "nir.h"
+#include "nir_builder.h"
+#include "radv_nir.h"
+
+bool
+radv_nir_lower_viewport_to_zero(nir_shader *nir)
+{
+   nir_function_impl *impl = nir_shader_get_entrypoint(nir);
+   bool progress = false;
+
+   nir_builder b;
+   nir_builder_init(&b, impl);
+
+   /* There should be only one deref load for VIEWPORT after lower_io_to_temporaries. */
+   nir_foreach_block (block, impl) {
+      nir_foreach_instr (instr, block) {
+         if (instr->type != nir_instr_type_intrinsic)
+            continue;
+
+         nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
+         if (intr->intrinsic != nir_intrinsic_load_deref)
+            continue;
+
+         nir_variable *var = nir_intrinsic_get_var(intr, 0);
+         if (var->data.mode != nir_var_shader_in || var->data.location != VARYING_SLOT_VIEWPORT)
+            continue;
+
+         b.cursor = nir_before_instr(instr);
+
+         nir_ssa_def_rewrite_uses(&intr->dest.ssa, nir_imm_zero(&b, 1, 32));
+         progress = true;
+         break;
+      }
+      if (progress)
+         break;
+   }
+
+   if (progress)
+      nir_metadata_preserve(impl, nir_metadata_block_index | nir_metadata_dominance);
+   else
+      nir_metadata_preserve(impl, nir_metadata_all);
+
+   return progress;
+}

src/amd/vulkan/radv_pipeline.c

@@ -1455,48 +1455,6 @@ get_vs_output_info(const struct radv_graphics_pipeline *pipeline)
    return &radv_get_last_vgt_shader(pipeline)->info.outinfo;
 }
 
-static bool
-radv_lower_viewport_to_zero(nir_shader *nir)
-{
-   nir_function_impl *impl = nir_shader_get_entrypoint(nir);
-   bool progress = false;
-
-   nir_builder b;
-   nir_builder_init(&b, impl);
-
-   /* There should be only one deref load for VIEWPORT after lower_io_to_temporaries. */
-   nir_foreach_block(block, impl) {
-      nir_foreach_instr(instr, block) {
-         if (instr->type != nir_instr_type_intrinsic)
-            continue;
-
-         nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
-         if (intr->intrinsic != nir_intrinsic_load_deref)
-            continue;
-
-         nir_variable *var = nir_intrinsic_get_var(intr, 0);
-         if (var->data.mode != nir_var_shader_in ||
-             var->data.location != VARYING_SLOT_VIEWPORT)
-            continue;
-
-         b.cursor = nir_before_instr(instr);
-
-         nir_ssa_def_rewrite_uses(&intr->dest.ssa, nir_imm_zero(&b, 1, 32));
-         progress = true;
-         break;
-      }
-      if (progress)
-         break;
-   }
-
-   if (progress)
-      nir_metadata_preserve(impl, nir_metadata_block_index | nir_metadata_dominance);
-   else
-      nir_metadata_preserve(impl, nir_metadata_all);
-
-   return progress;
-}
-
 static nir_variable *
 find_layer_out_var(nir_shader *nir)
 {
@@ -1759,7 +1717,7 @@ radv_pipeline_link_shaders(const struct radv_device *device,
       /* Lower the viewport index to zero when the last vertex stage doesn't export it. */
       if ((consumer->info.inputs_read & VARYING_BIT_VIEWPORT) &&
           !(producer->info.outputs_written & VARYING_BIT_VIEWPORT)) {
-         NIR_PASS(_, consumer, radv_lower_viewport_to_zero);
+         NIR_PASS(_, consumer, radv_nir_lower_viewport_to_zero);
       }
 
       /* Lower the view index to map on the layer. */