Add ExternalTextureOptions

This CL adds a `writer/ExternalTextureOptions` to allow providing
external texture information to the generators. The generators are
updated to have the option in their config, but do not use it yet.

Bug: tint:1855 chromium:1421379
Change-Id: I99b122c5cae145e8527158f300da81743f89775a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/123160
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>

src/tint/BUILD.gn

@@ -659,6 +659,7 @@ libtint_source_set("libtint_sem_src") {
     "sem/evaluation_stage.h",
     "sem/expression.cc",
     "sem/expression.h",
+    "sem/external_texture.h",
     "sem/for_loop_statement.cc",
     "sem/for_loop_statement.h",
     "sem/function.cc",
@@ -899,6 +900,8 @@ libtint_source_set("libtint_writer_src") {
     "writer/binding_point.h",
     "writer/check_supported_extensions.cc",
     "writer/check_supported_extensions.h",
+    "writer/external_texture_options.cc",
+    "writer/external_texture_options.h",
     "writer/flatten_bindings.cc",
     "writer/flatten_bindings.h",
     "writer/float_to_string.cc",

src/tint/CMakeLists.txt

@@ -301,6 +301,7 @@ list(APPEND TINT_LIB_SRCS
   sem/evaluation_stage.h
   sem/expression.cc
   sem/expression.h
+  sem/external_texture.h
   sem/for_loop_statement.cc
   sem/for_loop_statement.h
   sem/function_expression.cc
@@ -543,6 +544,8 @@ list(APPEND TINT_LIB_SRCS
   writer/binding_point.h
   writer/check_supported_extensions.cc
   writer/check_supported_extensions.h
+  writer/external_texture_options.cc
+  writer/external_texture_options.h
   writer/flatten_bindings.cc
   writer/flatten_bindings.h
   writer/float_to_string.cc

src/tint/sem/external_texture.h

@@ -0,0 +1,45 @@
+// Copyright 2023 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef SRC_TINT_SEM_EXTERNAL_TEXTURE_H_
+#define SRC_TINT_SEM_EXTERNAL_TEXTURE_H_
+
+#include <unordered_map>
+
+#include "src/tint/sem/binding_point.h"
+
+namespace tint::sem::external_texture {
+
+/// This struct identifies the binding groups and locations for new bindings to
+/// use when transforming a texture_external instance.
+struct BindingPoints {
+    /// The desired binding location of the texture_2d representing plane #1 when
+    /// a texture_external binding is expanded.
+    BindingPoint plane_1;
+    /// The desired binding location of the ExternalTextureParams uniform when a
+    /// texture_external binding is expanded.
+    BindingPoint params;
+
+    /// Reflect the fields of this class so that it can be used by tint::ForeachField()
+    TINT_REFLECT(plane_1, params);
+};
+
+/// BindingsMap is a map where the key is the binding location of a
+/// texture_external and the value is a struct containing the desired
+/// locations for new bindings expanded from the texture_external instance.
+using BindingsMap = std::unordered_map<BindingPoint, BindingPoints>;
+
+}  // namespace tint::sem::external_texture
+
+#endif  // SRC_TINT_SEM_EXTERNAL_TEXTURE_H_

src/tint/transform/multiplanar_external_texture.h

@@ -21,6 +21,7 @@
 #include "src/tint/ast/struct_member.h"
 #include "src/tint/builtin/function.h"
 #include "src/tint/sem/binding_point.h"
+#include "src/tint/sem/external_texture.h"
 #include "src/tint/transform/transform.h"
 
 namespace tint::transform {
@@ -40,22 +41,12 @@ class MultiplanarExternalTexture final : public Castable<MultiplanarExternalText
   public:
     /// This struct identifies the binding groups and locations for new bindings to
     /// use when transforming a texture_external instance.
-    struct BindingPoints {
+    using BindingPoints = sem::external_texture::BindingPoints;
-        /// The desired binding location of the texture_2d representing plane #1 when
-        /// a texture_external binding is expanded.
-        sem::BindingPoint plane_1;
-        /// The desired binding location of the ExternalTextureParams uniform when a
-        /// texture_external binding is expanded.
-        sem::BindingPoint params;
-
-        /// Reflect the fields of this class so that it can be used by tint::ForeachField()
-        TINT_REFLECT(plane_1, params);
-    };
 
     /// BindingsMap is a map where the key is the binding location of a
     /// texture_external and the value is a struct containing the desired
     /// locations for new bindings expanded from the texture_external instance.
-    using BindingsMap = std::unordered_map<sem::BindingPoint, BindingPoints>;
+    using BindingsMap = sem::external_texture::BindingsMap;
 
     /// NewBindingPoints is consumed by the MultiplanarExternalTexture transform.
     /// Data holds information about location of each texture_external binding and

src/tint/writer/array_length_from_uniform_options.cc

@@ -17,11 +17,15 @@
 namespace tint::writer {
 
 ArrayLengthFromUniformOptions::ArrayLengthFromUniformOptions() = default;
+
 ArrayLengthFromUniformOptions::~ArrayLengthFromUniformOptions() = default;
+
 ArrayLengthFromUniformOptions::ArrayLengthFromUniformOptions(const ArrayLengthFromUniformOptions&) =
     default;
+
 ArrayLengthFromUniformOptions& ArrayLengthFromUniformOptions::operator=(
     const ArrayLengthFromUniformOptions&) = default;
+
 ArrayLengthFromUniformOptions::ArrayLengthFromUniformOptions(ArrayLengthFromUniformOptions&&) =
     default;
 

src/tint/writer/external_texture_options.cc

@@ -0,0 +1,29 @@
+// Copyright 2023 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/tint/writer/external_texture_options.h"
+
+namespace tint::writer {
+
+ExternalTextureOptions::ExternalTextureOptions() = default;
+
+ExternalTextureOptions::~ExternalTextureOptions() = default;
+
+ExternalTextureOptions::ExternalTextureOptions(const ExternalTextureOptions&) = default;
+
+ExternalTextureOptions& ExternalTextureOptions::operator=(const ExternalTextureOptions&) = default;
+
+ExternalTextureOptions::ExternalTextureOptions(ExternalTextureOptions&&) = default;
+
+}  // namespace tint::writer

src/tint/writer/external_texture_options.h

@@ -0,0 +1,57 @@
+// Copyright 2023 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef SRC_TINT_WRITER_EXTERNAL_TEXTURE_OPTIONS_H_
+#define SRC_TINT_WRITER_EXTERNAL_TEXTURE_OPTIONS_H_
+
+#include <unordered_map>
+
+#include "src/tint/sem/external_texture.h"
+
+namespace tint::writer {
+
+/// Options used to specify mappings of binding points for external textures.
+class ExternalTextureOptions {
+  public:
+    /// This struct identifies the binding groups and locations for new bindings to
+    /// use when transforming a texture_external instance.
+    using BindingPoints = sem::external_texture::BindingPoints;
+
+    /// BindingsMap is a map where the key is the binding location of a
+    /// texture_external and the value is a struct containing the desired
+    /// locations for new bindings expanded from the texture_external instance.
+    using BindingsMap = sem::external_texture::BindingsMap;
+
+    /// Constructor
+    ExternalTextureOptions();
+    /// Destructor
+    ~ExternalTextureOptions();
+    /// Copy constructor
+    ExternalTextureOptions(const ExternalTextureOptions&);
+    /// Copy assignment
+    /// @returns this ExternalTextureOptions
+    ExternalTextureOptions& operator=(const ExternalTextureOptions&);
+    /// Move constructor
+    ExternalTextureOptions(ExternalTextureOptions&&);
+
+    /// A map of new binding points to use.
+    BindingsMap bindings_map;
+
+    /// Reflect the fields of this class so that it can be used by tint::ForeachField()
+    TINT_REFLECT(bindings_map);
+};
+
+}  // namespace tint::writer
+
+#endif  // SRC_TINT_WRITER_EXTERNAL_TEXTURE_OPTIONS_H_

src/tint/writer/glsl/generator.h

@@ -25,6 +25,7 @@
 #include "src/tint/builtin/access.h"
 #include "src/tint/sem/binding_point.h"
 #include "src/tint/sem/sampler_texture_pair.h"
+#include "src/tint/writer/external_texture_options.h"
 #include "src/tint/writer/glsl/version.h"
 #include "src/tint/writer/text.h"
 
@@ -76,6 +77,9 @@ struct Options {
     /// Set to 'true' to generates binding mappings for external textures
     bool generate_external_texture_bindings = false;
 
+    /// Options used in the binding mappings for external textures
+    ExternalTextureOptions external_texture_options = {};
+
     /// The GLSL version to emit
     Version version;
 
@@ -84,6 +88,7 @@ struct Options {
                  allow_collisions,
                  disable_workgroup_init,
                  generate_external_texture_bindings,
+                 external_texture_options,
                  version);
 };
 

src/tint/writer/hlsl/generator.h

@@ -28,6 +28,7 @@
 #include "src/tint/sem/binding_point.h"
 #include "src/tint/utils/bitset.h"
 #include "src/tint/writer/array_length_from_uniform_options.h"
+#include "src/tint/writer/external_texture_options.h"
 #include "src/tint/writer/text.h"
 
 // Forward declarations
@@ -61,6 +62,9 @@ struct Options {
     /// Set to 'true' to generates binding mappings for external textures
     bool generate_external_texture_bindings = false;
 
+    /// Options used in the binding mappings for external textures
+    ExternalTextureOptions external_texture_options = {};
+
     /// Options used to specify a mapping of binding points to indices into a UBO
     /// from which to load buffer sizes.
     ArrayLengthFromUniformOptions array_length_from_uniform = {};
@@ -77,6 +81,7 @@ struct Options {
                  root_constant_binding_point,
                  disable_workgroup_init,
                  generate_external_texture_bindings,
+                 external_texture_options,
                  array_length_from_uniform);
 };
 

src/tint/writer/msl/generator.h

@@ -23,6 +23,7 @@
 
 #include "src/tint/reflection.h"
 #include "src/tint/writer/array_length_from_uniform_options.h"
+#include "src/tint/writer/external_texture_options.h"
 #include "src/tint/writer/text.h"
 
 // Forward declarations
@@ -65,6 +66,9 @@ struct Options {
     /// Set to 'true' to generates binding mappings for external textures
     bool generate_external_texture_bindings = false;
 
+    /// Options used in the binding mappings for external textures
+    ExternalTextureOptions external_texture_options = {};
+
     /// Options used to specify a mapping of binding points to indices into a UBO
     /// from which to load buffer sizes.
     ArrayLengthFromUniformOptions array_length_from_uniform = {};
@@ -76,6 +80,7 @@ struct Options {
                  emit_vertex_point_size,
                  disable_workgroup_init,
                  generate_external_texture_bindings,
+                 external_texture_options,
                  array_length_from_uniform);
 };
 

src/tint/writer/spirv/generator.h

@@ -20,6 +20,7 @@
 #include <vector>
 
 #include "src/tint/reflection.h"
+#include "src/tint/writer/external_texture_options.h"
 #include "src/tint/writer/writer.h"
 
 // Forward declarations
@@ -48,6 +49,9 @@ struct Options {
     /// Set to 'true' to generates binding mappings for external textures
     bool generate_external_texture_bindings = false;
 
+    /// Options used in the binding mappings for external textures
+    ExternalTextureOptions external_texture_options = {};
+
     /// Set to `true` to initialize workgroup memory with OpConstantNull when
     /// VK_KHR_zero_initialize_workgroup_memory is enabled.
     bool use_zero_initialize_workgroup_memory_extension = false;
@@ -57,6 +61,7 @@ struct Options {
                  emit_vertex_point_size,
                  disable_workgroup_init,
                  generate_external_texture_bindings,
+                 external_texture_options,
                  use_zero_initialize_workgroup_memory_extension);
 };