1 files changed, 79 insertions, 0 deletions
diff --git a/src/gallium/drivers/etnaviv/etnaviv_nir_lower_ubo_to_uniform.c b/src/gallium/drivers/etnaviv/etnaviv_nir_lower_ubo_to_uniform.c
new file mode 100644
index 00000000000..3b7db740240
--- /dev/null
+++ b/src/gallium/drivers/etnaviv/etnaviv_nir_lower_ubo_to_uniform.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2020 Etnaviv Project
+ *
+ * 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, sub license,
+ * 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 NON-INFRINGEMENT. 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:
+ *    Christian Gmeiner <christian.gmeiner@gmail.com>
+ */
+
+#include "etnaviv_nir.h"
+
+/*
+ * Pass to lower the load_ubo intrinsics for block 0 back to load_uniform intrinsics.
+ */
+
+static bool
+is_const_ubo(const nir_instr *instr, const void *_data)
+{
+   if (instr->type != nir_instr_type_intrinsic)
+      return false;
+
+   nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
+   if (intr->intrinsic != nir_intrinsic_load_ubo)
+      return false;
+
+   if (!nir_src_is_const(intr->src[0]) || !nir_src_is_const(intr->src[1]))
+      return false;
+
+   const uint32_t block = nir_src_as_uint(intr->src[0]);
+   if (block > 0)
+      return false;
+
+   return true;
+}
+
+static nir_ssa_def *
+lower_ubo_to_uniform(nir_builder *b, nir_instr *instr, void *_data)
+{
+   nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
+   b->cursor = nir_before_instr(instr);
+
+   nir_ssa_def *ubo_offset = nir_ssa_for_src(b, intr->src[1], 1);
+   nir_ssa_def *uniform =
+      nir_load_uniform(b, intr->num_components, intr->dest.ssa.bit_size, ubo_offset,
+                       .base = nir_intrinsic_range_base(intr) / 16,
+                       .range = nir_intrinsic_range(intr) / 16,
+                       .dest_type = nir_type_float32);
+
+	nir_ssa_def_rewrite_uses(&intr->dest.ssa, nir_src_for_ssa(uniform));
+
+   return uniform;
+}
+
+bool
+etna_nir_lower_ubo_to_uniform(nir_shader *shader)
+{
+   return nir_shader_lower_instructions(shader,
+                                        is_const_ubo,
+                                        lower_ubo_to_uniform,
+                                        NULL);
+
+}