--- /dev/null
+/*
+ * Copyright (C) 2005-2007 Brian Paul All Rights Reserved.
+ * Copyright (C) 2008 VMware, Inc. All Rights Reserved.
+ * Copyright © 2014 Intel 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 "compiler/nir/nir.h"
+#include "compiler/nir/nir_builder.h"
+#include "gl_nir.h"
+#include "ir_uniform.h"
+
+#include "main/compiler.h"
+#include "main/mtypes.h"
+
+/* Calculate the sampler index based on array indicies and also
+ * calculate the base uniform location for struct members.
+ */
+static void
+calc_sampler_offsets(nir_deref *tail, nir_tex_instr *instr,
+ unsigned *array_elements, nir_ssa_def **indirect,
+ nir_builder *b, unsigned *location)
+{
+ if (tail->child == NULL)
+ return;
+
+ switch (tail->child->deref_type) {
+ case nir_deref_type_array: {
+ nir_deref_array *deref_array = nir_deref_as_array(tail->child);
+
+ assert(deref_array->deref_array_type != nir_deref_array_type_wildcard);
+
+ calc_sampler_offsets(tail->child, instr, array_elements,
+ indirect, b, location);
+ instr->texture_index += deref_array->base_offset * *array_elements;
+
+ if (deref_array->deref_array_type == nir_deref_array_type_indirect) {
+ nir_ssa_def *mul =
+ nir_imul(b, nir_imm_int(b, *array_elements),
+ nir_ssa_for_src(b, deref_array->indirect, 1));
+
+ nir_instr_rewrite_src(&instr->instr, &deref_array->indirect,
+ NIR_SRC_INIT);
+
+ if (*indirect) {
+ *indirect = nir_iadd(b, *indirect, mul);
+ } else {
+ *indirect = mul;
+ }
+ }
+
+ *array_elements *= glsl_get_length(tail->type);
+ break;
+ }
+
+ case nir_deref_type_struct: {
+ nir_deref_struct *deref_struct = nir_deref_as_struct(tail->child);
+ *location += glsl_get_record_location_offset(tail->type, deref_struct->index);
+ calc_sampler_offsets(tail->child, instr, array_elements,
+ indirect, b, location);
+ break;
+ }
+
+ default:
+ unreachable("Invalid deref type");
+ break;
+ }
+}
+
+static bool
+lower_sampler(nir_tex_instr *instr, const struct gl_shader_program *shader_program,
+ gl_shader_stage stage, nir_builder *b)
+{
+ if (instr->texture == NULL)
+ return false;
+
+ instr->texture_index = 0;
+ unsigned location = instr->texture->var->data.location;
+ unsigned array_elements = 1;
+ nir_ssa_def *indirect = NULL;
+
+ b->cursor = nir_before_instr(&instr->instr);
+ calc_sampler_offsets(&instr->texture->deref, instr, &array_elements,
+ &indirect, b, &location);
+
+ if (indirect) {
+ assert(array_elements >= 1);
+ indirect = nir_umin(b, indirect, nir_imm_int(b, array_elements - 1));
+
+ nir_tex_instr_add_src(instr, nir_tex_src_texture_offset,
+ nir_src_for_ssa(indirect));
+ nir_tex_instr_add_src(instr, nir_tex_src_sampler_offset,
+ nir_src_for_ssa(indirect));
+
+ instr->texture_array_size = array_elements;
+ }
+
+ assert(location < shader_program->data->NumUniformStorage &&
+ shader_program->data->UniformStorage[location].opaque[stage].active);
+
+ instr->texture_index +=
+ shader_program->data->UniformStorage[location].opaque[stage].index;
+
+ instr->sampler_index = instr->texture_index;
+
+ instr->texture = NULL;
+
+ return true;
+}
+
+static bool
+lower_impl(nir_function_impl *impl, const struct gl_shader_program *shader_program,
+ gl_shader_stage stage)
+{
+ nir_builder b;
+ nir_builder_init(&b, impl);
+ bool progress = false;
+
+ nir_foreach_block(block, impl) {
+ nir_foreach_instr(instr, block) {
+ if (instr->type == nir_instr_type_tex)
+ progress |= lower_sampler(nir_instr_as_tex(instr),
+ shader_program, stage, &b);
+ }
+ }
+
+ return progress;
+}
+
+bool
+gl_nir_lower_samplers_legacy(nir_shader *shader,
+ const struct gl_shader_program *shader_program)
+{
+ bool progress = false;
+
+ nir_assert_lowered_derefs(shader, nir_lower_texture_derefs);
+
+ nir_foreach_function(function, shader) {
+ if (function->impl)
+ progress |= lower_impl(function->impl, shader_program,
+ shader->info.stage);
+ }
+
+ return progress;
+}
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