nir: Rename gl_nir_lower_bindless_images.c in preparation for extending it.

The bulk of it can be reused to implement iris's internal non-bindless image lowering, which I would like to reuse in freedreno, v3d, and nir-to-tgsi. Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3728>
2020-01-23 10:42:15 -08:00
parent b62379ac6f
commit cad2d6583c
3 changed files with 2 additions and 2 deletions
--- a/src/compiler/glsl/gl_nir_lower_images.c
+++ b/src/compiler/glsl/gl_nir_lower_images.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright © 2019 Red Hat 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.
+ */
+
+/**
+ * \file
+ *
+ * Lower bindless image operations by turning the image_deref_* into a
+ * bindless_image_* intrinsic and adding a load_deref on the previous deref
+ * source. All applicable indicies are also set so that fetching the variable
+ * in the backend wouldn't be needed anymore.
+ */
+
+#include "compiler/nir/nir.h"
+#include "compiler/nir/nir_builder.h"
+#include "compiler/nir/nir_deref.h"
+
+#include "compiler/glsl/gl_nir.h"
+
+static bool
+lower_impl(nir_builder *b, nir_instr *instr) {
+   if (instr->type != nir_instr_type_intrinsic)
+      return false;
+
+   nir_intrinsic_instr *intrinsic = nir_instr_as_intrinsic(instr);
+
+   nir_deref_instr *deref;
+   nir_variable *var;
+
+   switch (intrinsic->intrinsic) {
+   case nir_intrinsic_image_deref_atomic_add:
+   case nir_intrinsic_image_deref_atomic_imin:
+   case nir_intrinsic_image_deref_atomic_umin:
+   case nir_intrinsic_image_deref_atomic_imax:
+   case nir_intrinsic_image_deref_atomic_umax:
+   case nir_intrinsic_image_deref_atomic_and:
+   case nir_intrinsic_image_deref_atomic_or:
+   case nir_intrinsic_image_deref_atomic_xor:
+   case nir_intrinsic_image_deref_atomic_exchange:
+   case nir_intrinsic_image_deref_atomic_comp_swap:
+   case nir_intrinsic_image_deref_atomic_fadd:
+   case nir_intrinsic_image_deref_load:
+   case nir_intrinsic_image_deref_samples:
+   case nir_intrinsic_image_deref_size:
+   case nir_intrinsic_image_deref_store: {
+      deref = nir_src_as_deref(intrinsic->src[0]);
+      var = nir_deref_instr_get_variable(deref);
+      break;
+   }
+   default:
+      return false;
+   }
+
+   if (deref->mode == nir_var_uniform && !var->data.bindless)
+      return false;
+
+   b->cursor = nir_before_instr(instr);
+   nir_ssa_def *handle = nir_load_deref(b, deref);
+   nir_rewrite_image_intrinsic(intrinsic, handle, true);
+   return true;
+}
+
+bool
+gl_nir_lower_bindless_images(nir_shader *shader)
+{
+   bool progress = false;
+
+   nir_foreach_function(function, shader) {
+      if (function->impl) {
+         nir_builder b;
+         nir_builder_init(&b, function->impl);
+
+         nir_foreach_block(block, function->impl)
+            nir_foreach_instr(instr, block)
+               progress |= lower_impl(&b, instr);
+      }
+   }
+
+   return progress;
+}