Geometry Nodes: move type conversions to blenkernel

The type conversions do not depend on other files in the nodes
module. Furthermore we want to use the conversions in the
geometry module without creating a dependency to the
nodes module there.

1 files changed, 347 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/type_conversions.cc b/source/blender/blenkernel/intern/type_conversions.cc
new file mode 100644
index 00000000000..ab42d508538
--- /dev/null
+++ b/source/blender/blenkernel/intern/type_conversions.cc
@@ -0,0 +1,347 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "BKE_type_conversions.hh"
+
+#include "FN_multi_function_builder.hh"
+
+#include "BLI_color.hh"
+#include "BLI_float2.hh"
+#include "BLI_float3.hh"
+
+namespace blender::bke {
+
+using fn::MFDataType;
+
+template<typename From, typename To, To (*ConversionF)(const From &)>
+static void add_implicit_conversion(DataTypeConversions &conversions)
+{
+  static const CPPType &from_type = CPPType::get<From>();
+  static const CPPType &to_type = CPPType::get<To>();
+  static const std::string conversion_name = from_type.name() + " to " + to_type.name();
+
+  static fn::CustomMF_SI_SO<From, To> multi_function{conversion_name.c_str(), ConversionF};
+  static auto convert_single_to_initialized = [](const void *src, void *dst) {
+    *(To *)dst = ConversionF(*(const From *)src);
+  };
+  static auto convert_single_to_uninitialized = [](const void *src, void *dst) {
+    new (dst) To(ConversionF(*(const From *)src));
+  };
+  conversions.add(fn::MFDataType::ForSingle<From>(),
+                  fn::MFDataType::ForSingle<To>(),
+                  multi_function,
+                  convert_single_to_initialized,
+                  convert_single_to_uninitialized);
+}
+
+static float2 float_to_float2(const float &a)
+{
+  return float2(a);
+}
+static float3 float_to_float3(const float &a)
+{
+  return float3(a);
+}
+static int32_t float_to_int(const float &a)
+{
+  return (int32_t)a;
+}
+static bool float_to_bool(const float &a)
+{
+  return a > 0.0f;
+}
+static ColorGeometry4f float_to_color(const float &a)
+{
+  return ColorGeometry4f(a, a, a, 1.0f);
+}
+
+static float3 float2_to_float3(const float2 &a)
+{
+  return float3(a.x, a.y, 0.0f);
+}
+static float float2_to_float(const float2 &a)
+{
+  return (a.x + a.y) / 2.0f;
+}
+static int float2_to_int(const float2 &a)
+{
+  return (int32_t)((a.x + a.y) / 2.0f);
+}
+static bool float2_to_bool(const float2 &a)
+{
+  return !is_zero_v2(a);
+}
+static ColorGeometry4f float2_to_color(const float2 &a)
+{
+  return ColorGeometry4f(a.x, a.y, 0.0f, 1.0f);
+}
+
+static bool float3_to_bool(const float3 &a)
+{
+  return !is_zero_v3(a);
+}
+static float float3_to_float(const float3 &a)
+{
+  return (a.x + a.y + a.z) / 3.0f;
+}
+static int float3_to_int(const float3 &a)
+{
+  return (int)((a.x + a.y + a.z) / 3.0f);
+}
+static float2 float3_to_float2(const float3 &a)
+{
+  return float2(a);
+}
+static ColorGeometry4f float3_to_color(const float3 &a)
+{
+  return ColorGeometry4f(a.x, a.y, a.z, 1.0f);
+}
+
+static bool int_to_bool(const int32_t &a)
+{
+  return a > 0;
+}
+static float int_to_float(const int32_t &a)
+{
+  return (float)a;
+}
+static float2 int_to_float2(const int32_t &a)
+{
+  return float2((float)a);
+}
+static float3 int_to_float3(const int32_t &a)
+{
+  return float3((float)a);
+}
+static ColorGeometry4f int_to_color(const int32_t &a)
+{
+  return ColorGeometry4f((float)a, (float)a, (float)a, 1.0f);
+}
+
+static float bool_to_float(const bool &a)
+{
+  return (bool)a;
+}
+static int32_t bool_to_int(const bool &a)
+{
+  return (int32_t)a;
+}
+static float2 bool_to_float2(const bool &a)
+{
+  return (a) ? float2(1.0f) : float2(0.0f);
+}
+static float3 bool_to_float3(const bool &a)
+{
+  return (a) ? float3(1.0f) : float3(0.0f);
+}
+static ColorGeometry4f bool_to_color(const bool &a)
+{
+  return (a) ? ColorGeometry4f(1.0f, 1.0f, 1.0f, 1.0f) : ColorGeometry4f(0.0f, 0.0f, 0.0f, 1.0f);
+}
+
+static bool color_to_bool(const ColorGeometry4f &a)
+{
+  return rgb_to_grayscale(a) > 0.0f;
+}
+static float color_to_float(const ColorGeometry4f &a)
+{
+  return rgb_to_grayscale(a);
+}
+static int32_t color_to_int(const ColorGeometry4f &a)
+{
+  return (int)rgb_to_grayscale(a);
+}
+static float2 color_to_float2(const ColorGeometry4f &a)
+{
+  return float2(a.r, a.g);
+}
+static float3 color_to_float3(const ColorGeometry4f &a)
+{
+  return float3(a.r, a.g, a.b);
+}
+
+static DataTypeConversions create_implicit_conversions()
+{
+  DataTypeConversions conversions;
+
+  add_implicit_conversion<float, float2, float_to_float2>(conversions);
+  add_implicit_conversion<float, float3, float_to_float3>(conversions);
+  add_implicit_conversion<float, int32_t, float_to_int>(conversions);
+  add_implicit_conversion<float, bool, float_to_bool>(conversions);
+  add_implicit_conversion<float, ColorGeometry4f, float_to_color>(conversions);
+
+  add_implicit_conversion<float2, float3, float2_to_float3>(conversions);
+  add_implicit_conversion<float2, float, float2_to_float>(conversions);
+  add_implicit_conversion<float2, int32_t, float2_to_int>(conversions);
+  add_implicit_conversion<float2, bool, float2_to_bool>(conversions);
+  add_implicit_conversion<float2, ColorGeometry4f, float2_to_color>(conversions);
+
+  add_implicit_conversion<float3, bool, float3_to_bool>(conversions);
+  add_implicit_conversion<float3, float, float3_to_float>(conversions);
+  add_implicit_conversion<float3, int32_t, float3_to_int>(conversions);
+  add_implicit_conversion<float3, float2, float3_to_float2>(conversions);
+  add_implicit_conversion<float3, ColorGeometry4f, float3_to_color>(conversions);
+
+  add_implicit_conversion<int32_t, bool, int_to_bool>(conversions);
+  add_implicit_conversion<int32_t, float, int_to_float>(conversions);
+  add_implicit_conversion<int32_t, float2, int_to_float2>(conversions);
+  add_implicit_conversion<int32_t, float3, int_to_float3>(conversions);
+  add_implicit_conversion<int32_t, ColorGeometry4f, int_to_color>(conversions);
+
+  add_implicit_conversion<bool, float, bool_to_float>(conversions);
+  add_implicit_conversion<bool, int32_t, bool_to_int>(conversions);
+  add_implicit_conversion<bool, float2, bool_to_float2>(conversions);
+  add_implicit_conversion<bool, float3, bool_to_float3>(conversions);
+  add_implicit_conversion<bool, ColorGeometry4f, bool_to_color>(conversions);
+
+  add_implicit_conversion<ColorGeometry4f, bool, color_to_bool>(conversions);
+  add_implicit_conversion<ColorGeometry4f, float, color_to_float>(conversions);
+  add_implicit_conversion<ColorGeometry4f, int32_t, color_to_int>(conversions);
+  add_implicit_conversion<ColorGeometry4f, float2, color_to_float2>(conversions);
+  add_implicit_conversion<ColorGeometry4f, float3, color_to_float3>(conversions);
+
+  return conversions;
+}
+
+const DataTypeConversions &get_implicit_type_conversions()
+{
+  static const DataTypeConversions conversions = create_implicit_conversions();
+  return conversions;
+}
+
+void DataTypeConversions::convert_to_uninitialized(const CPPType &from_type,
+                                                   const CPPType &to_type,
+                                                   const void *from_value,
+                                                   void *to_value) const
+{
+  if (from_type == to_type) {
+    from_type.copy_construct(from_value, to_value);
+    return;
+  }
+
+  const ConversionFunctions *functions = this->get_conversion_functions(
+      MFDataType::ForSingle(from_type), MFDataType::ForSingle(to_type));
+  BLI_assert(functions != nullptr);
+
+  functions->convert_single_to_uninitialized(from_value, to_value);
+}
+
+class GVArray_For_ConvertedGVArray : public fn::GVArrayImpl {
+ private:
+  fn::GVArray varray_;
+  const CPPType &from_type_;
+  ConversionFunctions old_to_new_conversions_;
+
+ public:
+  GVArray_For_ConvertedGVArray(fn::GVArray varray,
+                               const CPPType &to_type,
+                               const DataTypeConversions &conversions)
+      : fn::GVArrayImpl(to_type, varray.size()),
+        varray_(std::move(varray)),
+        from_type_(varray_.type())
+  {
+    old_to_new_conversions_ = *conversions.get_conversion_functions(from_type_, to_type);
+  }
+
+ private:
+  void get(const int64_t index, void *r_value) const override
+  {
+    BUFFER_FOR_CPP_TYPE_VALUE(from_type_, buffer);
+    varray_.get(index, buffer);
+    old_to_new_conversions_.convert_single_to_initialized(buffer, r_value);
+    from_type_.destruct(buffer);
+  }
+
+  void get_to_uninitialized(const int64_t index, void *r_value) const override
+  {
+    BUFFER_FOR_CPP_TYPE_VALUE(from_type_, buffer);
+    varray_.get(index, buffer);
+    old_to_new_conversions_.convert_single_to_uninitialized(buffer, r_value);
+    from_type_.destruct(buffer);
+  }
+};
+
+class GVMutableArray_For_ConvertedGVMutableArray : public fn::GVMutableArrayImpl {
+ private:
+  fn::GVMutableArray varray_;
+  const CPPType &from_type_;
+  ConversionFunctions old_to_new_conversions_;
+  ConversionFunctions new_to_old_conversions_;
+
+ public:
+  GVMutableArray_For_ConvertedGVMutableArray(fn::GVMutableArray varray,
+                                             const CPPType &to_type,
+                                             const DataTypeConversions &conversions)
+      : fn::GVMutableArrayImpl(to_type, varray.size()),
+        varray_(std::move(varray)),
+        from_type_(varray_.type())
+  {
+    old_to_new_conversions_ = *conversions.get_conversion_functions(from_type_, to_type);
+    new_to_old_conversions_ = *conversions.get_conversion_functions(to_type, from_type_);
+  }
+
+ private:
+  void get(const int64_t index, void *r_value) const override
+  {
+    BUFFER_FOR_CPP_TYPE_VALUE(from_type_, buffer);
+    varray_.get(index, buffer);
+    old_to_new_conversions_.convert_single_to_initialized(buffer, r_value);
+    from_type_.destruct(buffer);
+  }
+
+  void get_to_uninitialized(const int64_t index, void *r_value) const override
+  {
+    BUFFER_FOR_CPP_TYPE_VALUE(from_type_, buffer);
+    varray_.get(index, buffer);
+    old_to_new_conversions_.convert_single_to_uninitialized(buffer, r_value);
+    from_type_.destruct(buffer);
+  }
+
+  void set_by_move(const int64_t index, void *value) override
+  {
+    BUFFER_FOR_CPP_TYPE_VALUE(from_type_, buffer);
+    new_to_old_conversions_.convert_single_to_uninitialized(value, buffer);
+    varray_.set_by_relocate(index, buffer);
+  }
+};
+
+fn::GVArray DataTypeConversions::try_convert(fn::GVArray varray, const CPPType &to_type) const
+{
+  const CPPType &from_type = varray.type();
+  if (from_type == to_type) {
+    return varray;
+  }
+  if (!this->is_convertible(from_type, to_type)) {
+    return {};
+  }
+  return fn::GVArray::For<GVArray_For_ConvertedGVArray>(std::move(varray), to_type, *this);
+}
+
+fn::GVMutableArray DataTypeConversions::try_convert(fn::GVMutableArray varray,
+                                                    const CPPType &to_type) const
+{
+  const CPPType &from_type = varray.type();
+  if (from_type == to_type) {
+    return varray;
+  }
+  if (!this->is_convertible(from_type, to_type)) {
+    return {};
+  }
+  return fn::GVMutableArray::For<GVMutableArray_For_ConvertedGVMutableArray>(
+      std::move(varray), to_type, *this);
+}
+
+}  // namespace blender::bke