broadcom: add helpers for double-buffer heuristic

So we can share them between vulkan and gl.

Reviewed-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32111>

src/broadcom/common/v3d_util.c

@@ -268,3 +268,23 @@ v3d_compute_rt_row_row_stride_128_bits(uint32_t tile_width,
 
         return (tile_width * bpp) / 2;
 }
+
+static inline uint32_t
+compute_prog_score(struct v3d_prog_data *p, uint32_t qpu_size)
+{
+        const uint32_t inst_count = qpu_size / sizeof(uint64_t);
+        const uint32_t tmu_count = p->tmu_count + p->tmu_spills + p->tmu_fills;
+        return inst_count + 4 * tmu_count;
+}
+
+void
+v3d_update_double_buffer_score(uint32_t vertex_count,
+                               uint32_t vs_qpu_size,
+                               uint32_t fs_qpu_size,
+                               struct v3d_prog_data *vs,
+                               struct v3d_prog_data *fs,
+                               struct v3d_double_buffer_score *score)
+{
+        score->geom += vertex_count * compute_prog_score(vs, vs_qpu_size);
+        score->render += compute_prog_score(fs, fs_qpu_size);
+}

src/broadcom/common/v3d_util.h

@@ -27,6 +27,7 @@
 #include "util/macros.h"
 #include "common/v3d_device_info.h"
 #include "compiler/shader_enums.h"
+#include "broadcom/compiler/v3d_compiler.h"
 #include "util/format/u_formats.h"
 
 uint32_t
@@ -79,4 +80,35 @@ log2_tile_size(uint32_t size)
 uint32_t
 v3d_compute_rt_row_row_stride_128_bits(uint32_t tile_width,
                                        uint32_t bpp);
+
+struct v3d_double_buffer_score {
+        uint32_t geom;
+        uint32_t render;
+};
+
+void
+v3d_update_double_buffer_score(uint32_t vertex_count,
+                               uint32_t vs_qpu_size,
+                               uint32_t fs_qpu_size,
+                               struct v3d_prog_data *vs,
+                               struct v3d_prog_data *fs,
+                               struct v3d_double_buffer_score *score);
+
+static inline bool
+v3d_double_buffer_score_ok(struct v3d_double_buffer_score *score)
+{
+        /* Double buffer decreases tile size, which increases
+         * VS invocations so too much geometry is not good.
+         */
+        if (score->geom > 200000)
+                return false;
+
+        /* We want enough rendering work to be able to hide
+         * latency from tile stores.
+         */
+        if (score->render < 200)
+                return false;
+        return true;
+}
+
 #endif

src/broadcom/meson.build

@@ -70,7 +70,7 @@ libbroadcom_v3d = static_library(
   link_whole : v3d_libs + per_version_libs,
   link_with: [libv3d_neon],
   build_by_default : false,
-  dependencies: [dep_valgrind, dep_thread, idep_mesautil],
+  dependencies: [dep_valgrind, dep_thread, idep_mesautil, idep_nir_headers],
 )
 
 if with_broadcom_vk