nir: Move nir_tcs_info to separate file.

The nir_tcs_info struct is like nir_xfb_info in the sense that
it's very specialized and not often used, so it deserves its own
header too.

Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33439>

src/amd/common/nir/ac_nir_lower_tess_io_to_mem.c

@@ -8,6 +8,7 @@
 #include "ac_nir.h"
 #include "ac_nir_helpers.h"
 #include "nir_builder.h"
+#include "nir_tcs_info.h"
 #include "util/u_math.h"
 
 /*

src/amd/vulkan/radv_shader_info.h

@@ -15,6 +15,7 @@
 #include <stdbool.h>
 
 #include "nir.h"
+#include "nir_tcs_info.h"
 #include "radv_constants.h"
 #include "radv_shader_args.h"
 

src/compiler/nir/meson.build

@@ -295,6 +295,7 @@ files_libnir = files(
   'nir_split_vars.c',
   'nir_sweep.c',
   'nir_to_lcssa.c',
+  'nir_tcs_info.h',
   'nir_trivialize_registers.c',
   'nir_use_dominance.c',
   'nir_validate.c',

src/compiler/nir/nir.h

@@ -5621,44 +5621,6 @@ void nir_gather_types(nir_function_impl *impl,
                       BITSET_WORD *float_types,
                       BITSET_WORD *int_types);
 
-typedef struct nir_tcs_info {
-   /* Whether all invocations write tess level outputs.
-    *
-    * This is useful when a pass wants to read tess level values at the end
-    * of the shader. If this is true, the pass doesn't have to insert a barrier
-    * and use output loads, it can just use the SSA defs that are being stored
-    * (or phis thereof) to get the tess level output values.
-    */
-   bool all_invocations_define_tess_levels;
-
-   /* Whether any of the outer tess level components is effectively 0, meaning
-    * that the shader discards the patch. NaNs and negative values are included
-    * in this. If the patch is discarded, inner tess levels have no effect.
-    */
-   bool all_tess_levels_are_effectively_zero;
-
-   /* Whether all tess levels are effectively 1, meaning that the tessellator
-    * behaves as if they were 1. There is a range of values that lead to that
-    * behavior depending on the tessellation spacing.
-    */
-   bool all_tess_levels_are_effectively_one;
-
-   /* Whether the shader uses a barrier synchronizing TCS output stores.
-    * For example, passes that write an output at the beginning of the shader
-    * and load it at the end can use this to determine whether they have to
-    * insert a barrier or whether the shader already contains a barrier.
-    */
-   bool always_executes_barrier;
-
-   /* Whether outer tess levels <= 0 are written anywhere in the shader. */
-   bool discards_patches;
-} nir_tcs_info;
-
-void
-nir_gather_tcs_info(const nir_shader *nir, nir_tcs_info *info,
-                    enum tess_primitive_mode prim,
-                    enum gl_tess_spacing spacing);
-
 void nir_assign_var_locations(nir_shader *shader, nir_variable_mode mode,
                               unsigned *size,
                               int (*type_size)(const struct glsl_type *, bool));

src/compiler/nir/nir_gather_tcs_info.c

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: MIT
  */
 
+#include "nir_tcs_info.h"
 #include "nir.h"
 #include <math.h>
 

src/compiler/nir/nir_tcs_info.h

@@ -0,0 +1,80 @@
+/*
+ * Copyright © 2024 Advanced Micro Devices, Inc.
+ *
+ * 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.
+ *
+ * Authors:
+ *    Marek Olšák <marek.olsak@amd.com>
+ *
+ */
+
+#ifndef NIR_TCS_INFO_H
+#define NIR_TCS_INFO_H
+
+#include "compiler/shader_enums.h"
+#include "nir_defines.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct nir_tcs_info {
+   /* Whether all invocations write tess level outputs.
+    *
+    * This is useful when a pass wants to read tess level values at the end
+    * of the shader. If this is true, the pass doesn't have to insert a barrier
+    * and use output loads, it can just use the SSA defs that are being stored
+    * (or phis thereof) to get the tess level output values.
+    */
+   bool all_invocations_define_tess_levels;
+
+   /* Whether any of the outer tess level components is effectively 0, meaning
+    * that the shader discards the patch. NaNs and negative values are included
+    * in this. If the patch is discarded, inner tess levels have no effect.
+    */
+   bool all_tess_levels_are_effectively_zero;
+
+   /* Whether all tess levels are effectively 1, meaning that the tessellator
+    * behaves as if they were 1. There is a range of values that lead to that
+    * behavior depending on the tessellation spacing.
+    */
+   bool all_tess_levels_are_effectively_one;
+
+   /* Whether the shader uses a barrier synchronizing TCS output stores.
+    * For example, passes that write an output at the beginning of the shader
+    * and load it at the end can use this to determine whether they have to
+    * insert a barrier or whether the shader already contains a barrier.
+    */
+   bool always_executes_barrier;
+
+   /* Whether outer tess levels <= 0 are written anywhere in the shader. */
+   bool discards_patches;
+} nir_tcs_info;
+
+void
+nir_gather_tcs_info(const nir_shader *nir, nir_tcs_info *info,
+                    enum tess_primitive_mode prim,
+                    enum gl_tess_spacing spacing);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NIR_TCS_INFO_H */

src/gallium/drivers/radeonsi/si_shader.c

@@ -10,6 +10,7 @@
 #include "nir.h"
 #include "nir_builder.h"
 #include "nir_serialize.h"
+#include "nir_tcs_info.h"
 #include "nir_xfb_info.h"
 #include "si_pipe.h"
 #include "si_shader_internal.h"

src/gallium/drivers/radeonsi/si_shader_info.c

@@ -9,6 +9,7 @@
 #include "util/mesa-sha1.h"
 #include "sid.h"
 #include "nir.h"
+#include "nir_tcs_info.h"
 #include "nir_xfb_info.h"
 #include "aco_interface.h"
 #include "ac_nir.h"