From e06d5cd41406f13d390ac77580096652d987b7ae Mon Sep 17 00:00:00 2001
From: bruvzg <7645683+bruvzg@users.noreply.github.com>
Date: Sun, 20 Mar 2022 18:19:27 +0200
Subject: [PATCH] Add double precision build support.

---
 .github/workflows/ci.yml            |  7 +++++++
 CMakeLists.txt                      | 18 +++++++++++------
 SConstruct                          |  4 ++++
 binding_generator.py                | 14 +++++++++++---
 include/godot_cpp/variant/color.hpp | 30 ++++++++++++++---------------
 5 files changed, 49 insertions(+), 24 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b0ab2eb0..ffbd9680 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,13 @@ jobs:
             artifact-name: godot-cpp-linux-glibc2.27-x86_64-release
             artifact-path: bin/libgodot-cpp.linux.release.64.a
 
+          - name: 🐧 Linux (GCC, Double Precision)
+            os: ubuntu-18.04
+            platform: linux
+            artifact-name: godot-cpp-linux-glibc2.27-x86_64-double-release
+            artifact-path: bin/libgodot-cpp.linux.release.64.a
+            flags: float=64
+
           - name: 🏁 Windows (x86_64, MSVC)
             os: windows-2019
             platform: windows
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5cd05ff2..f81be10a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,7 @@
 # godot-cpp cmake arguments
 # GODOT_HEADERS_DIR:		This is where the gdnative include folder is (godot_source/modules/gdnative/include)
 # GODOT_CUSTOM_API_FILE:	This is if you have another path for the godot_api.json
+# FLOAT_TYPE				Floating-point precision (32, 64)
 #
 # Android cmake arguments
 # CMAKE_TOOLCHAIN_FILE:		The path to the android cmake toolchain ($ANDROID_NDK/build/cmake/android.toolchain.cmake)
@@ -60,6 +61,16 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
+set(FLOAT_TYPE_FLAG "float" CACHE STRING "")
+if(FLOAT_TYPE EQUAL 64)
+	set(FLOAT_TYPE_FLAG "double" CACHE STRING "")
+endif(FLOAT_TYPE EQUAL 64)
+
+set(BITS 32)
+if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+	set(BITS 64)
+endif(CMAKE_SIZEOF_VOID_P EQUAL 8)
+
 # Input from user for godot headers and the api file
 set(GODOT_HEADERS_DIR "godot-headers" CACHE STRING "")
 set(GODOT_CUSTOM_API_FILE "godot-headers/extension_api.json" CACHE STRING "")
@@ -139,7 +150,7 @@ execute_process(COMMAND "${Python3_EXECUTABLE}" "-c" "import binding_generator;
 )
 
 add_custom_command(OUTPUT ${GENERATED_FILES_LIST}
-		COMMAND "${Python3_EXECUTABLE}" "-c" "import binding_generator; binding_generator.generate_bindings(\"${GODOT_CUSTOM_API_FILE}\", \"${GENERATE_BINDING_PARAMETERS}\", \"${CMAKE_CURRENT_BINARY_DIR}\")"
+		COMMAND "${Python3_EXECUTABLE}" "-c" "import binding_generator; binding_generator.generate_bindings(\"${GODOT_CUSTOM_API_FILE}\", \"${GENERATE_BINDING_PARAMETERS}\", \"${BITS}\", \"${FLOAT_TYPE_FLAG}\", \"${CMAKE_CURRENT_BINARY_DIR}\")"
 		VERBATIM
 		WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
 		MAIN_DEPENDENCY ${GODOT_CUSTOM_API_FILE}
@@ -185,11 +196,6 @@ set_property(TARGET ${PROJECT_NAME} APPEND_STRING PROPERTY LINK_FLAGS ${GODOT_LI
 
 # Create the correct name (godot.os.build_type.system_bits)
 
-set(BITS 32)
-if(CMAKE_SIZEOF_VOID_P EQUAL 8)
-	set(BITS 64)
-endif(CMAKE_SIZEOF_VOID_P EQUAL 8)
-
 string(TOLOWER "${CMAKE_SYSTEM_NAME}" SYSTEM_NAME)
 string(TOLOWER "${CMAKE_BUILD_TYPE}" BUILD_TYPE)
 
diff --git a/SConstruct b/SConstruct
index a7357096..b783156e 100644
--- a/SConstruct
+++ b/SConstruct
@@ -139,6 +139,7 @@ opts.Add(
 opts.Add(BoolVariable("generate_template_get_node", "Generate a template version of the Node class's get_node.", True))
 
 opts.Add(BoolVariable("build_library", "Build the godot-cpp library.", True))
+opts.Add(EnumVariable("float", "Floating-point precision", "32", ("32", "64")))
 
 opts.Update(env)
 Help(opts.GenerateHelpText(env))
@@ -171,6 +172,9 @@ else:
 if env["target"] == "debug":
     env.Append(CPPDEFINES=["DEBUG_ENABLED", "DEBUG_METHODS_ENABLED"])
 
+if env["float"] == "64":
+    env.Append(CPPDEFINES=["REAL_T_IS_DOUBLE"])
+
 if env["platform"] == "linux" or env["platform"] == "freebsd":
     if env["use_llvm"]:
         env["CXX"] = "clang++"
diff --git a/binding_generator.py b/binding_generator.py
index 2b18a784..3e0bcd68 100644
--- a/binding_generator.py
+++ b/binding_generator.py
@@ -64,11 +64,17 @@ def scons_emit_files(target, source, env):
 
 
 def scons_generate_bindings(target, source, env):
-    generate_bindings(str(source[0]), env["generate_template_get_node"], target[0].abspath)
+    generate_bindings(
+        str(source[0]),
+        env["generate_template_get_node"],
+        env["bits"],
+        "double" if (env["float"] == "64") else "float",
+        target[0].abspath,
+    )
     return None
 
 
-def generate_bindings(api_filepath, use_template_get_node, output_dir="."):
+def generate_bindings(api_filepath, use_template_get_node, bits="64", double="float", output_dir="."):
     api = None
 
     target_dir = Path(output_dir) / "gen"
@@ -79,9 +85,11 @@ def generate_bindings(api_filepath, use_template_get_node, output_dir="."):
     shutil.rmtree(target_dir, ignore_errors=True)
     target_dir.mkdir(parents=True)
 
+    print("Built-in type config: " + double + "_" + bits)
+
     generate_global_constants(api, target_dir)
     generate_global_constant_binds(api, target_dir)
-    generate_builtin_bindings(api, target_dir, "float_64")
+    generate_builtin_bindings(api, target_dir, double + "_" + bits)
     generate_engine_classes_bindings(api, target_dir, use_template_get_node)
     generate_utility_functions(api, target_dir)
 
diff --git a/include/godot_cpp/variant/color.hpp b/include/godot_cpp/variant/color.hpp
index 608f8af3..5d141a24 100644
--- a/include/godot_cpp/variant/color.hpp
+++ b/include/godot_cpp/variant/color.hpp
@@ -159,7 +159,7 @@ public:
 
 	inline Color blend(const Color &p_over) const {
 		Color res;
-		float sa = (real_t)1.0 - p_over.a;
+		float sa = 1.0 - p_over.a;
 		res.a = a * sa + p_over.a;
 		if (res.a == 0) {
 			return Color(0, 0, 0, 0);
@@ -173,16 +173,16 @@ public:
 
 	inline Color srgb_to_linear() const {
 		return Color(
-				r < (real_t)0.04045 ? r * (real_t)(1.0 / 12.92) : Math::pow((r + (real_t)0.055) * (real_t)(1.0 / (1.0 + 0.055)), (real_t)2.4),
-				g < (real_t)0.04045 ? g * (real_t)(1.0 / 12.92) : Math::pow((g + (real_t)0.055) * (real_t)(1.0 / (1.0 + 0.055)), (real_t)2.4),
-				b < (real_t)0.04045 ? b * (real_t)(1.0 / 12.92) : Math::pow((b + (real_t)0.055) * (real_t)(1.0 / (1.0 + 0.055)), (real_t)2.4),
+				r < 0.04045 ? r * (1.0 / 12.92) : Math::pow((r + 0.055f) * (1.0 / (1.0 + 0.055)), 2.4),
+				g < 0.04045 ? g * (1.0 / 12.92) : Math::pow((g + 0.055f) * (1.0 / (1.0 + 0.055)), 2.4),
+				b < 0.04045 ? b * (1.0 / 12.92) : Math::pow((b + 0.055f) * (1.0 / (1.0 + 0.055)), 2.4),
 				a);
 	}
 	inline Color linear_to_srgb() const {
 		return Color(
-				r < (real_t)0.0031308 ? (real_t)12.92 * r : (real_t)(1.0 + 0.055) * Math::pow(r, (real_t)(1.0 / 2.4)) - (real_t)0.055,
-				g < (real_t)0.0031308 ? (real_t)12.92 * g : (real_t)(1.0 + 0.055) * Math::pow(g, (real_t)(1.0 / 2.4)) - (real_t)0.055,
-				b < (real_t)0.0031308 ? (real_t)12.92 * b : (real_t)(1.0 + 0.055) * Math::pow(b, (real_t)(1.0 / 2.4)) - (real_t)0.055, a);
+				r < 0.0031308f ? 12.92f * r : (1.0f + 0.055f) * Math::pow(r, 1.0f / 2.4f) - 0.055f,
+				g < 0.0031308f ? 12.92f * g : (1.0f + 0.055f) * Math::pow(g, 1.0f / 2.4f) - 0.055f,
+				b < 0.0031308f ? 12.92f * b : (1.0f + 0.055f) * Math::pow(b, 1.0f / 2.4f) - 0.055f, a);
 	}
 
 	static Color hex(uint32_t p_hex);
@@ -204,14 +204,14 @@ public:
 	operator String() const;
 
 	// For the binder.
-	inline void set_r8(int32_t r8) { r = (Math::clamp(r8, 0, 255) / (real_t)255.0); }
-	inline int32_t get_r8() const { return int32_t(Math::clamp(r * (real_t)255.0, (real_t)0.0, (real_t)255.0)); }
-	inline void set_g8(int32_t g8) { g = (Math::clamp(g8, 0, 255) / (real_t)255.0); }
-	inline int32_t get_g8() const { return int32_t(Math::clamp(g * (real_t)255.0, (real_t)0.0, (real_t)255.0)); }
-	inline void set_b8(int32_t b8) { b = (Math::clamp(b8, 0, 255) / (real_t)255.0); }
-	inline int32_t get_b8() const { return int32_t(Math::clamp(b * (real_t)255.0, (real_t)0.0, (real_t)255.0)); }
-	inline void set_a8(int32_t a8) { a = (Math::clamp(a8, 0, 255) / (real_t)255.0); }
-	inline int32_t get_a8() const { return int32_t(Math::clamp(a * (real_t)255.0, (real_t)0.0, (real_t)255.0)); }
+	inline void set_r8(int32_t r8) { r = (Math::clamp(r8, 0, 255) / 255.0); }
+	inline int32_t get_r8() const { return int32_t(Math::clamp(r * 255.0, 0.0, 255.0)); }
+	inline void set_g8(int32_t g8) { g = (Math::clamp(g8, 0, 255) / 255.0); }
+	inline int32_t get_g8() const { return int32_t(Math::clamp(g * 255.0, 0.0, 255.0)); }
+	inline void set_b8(int32_t b8) { b = (Math::clamp(b8, 0, 255) / 255.0); }
+	inline int32_t get_b8() const { return int32_t(Math::clamp(b * 255.0, 0.0, 255.0)); }
+	inline void set_a8(int32_t a8) { a = (Math::clamp(a8, 0, 255) / 255.0); }
+	inline int32_t get_a8() const { return int32_t(Math::clamp(a * 255.0, 0.0, 255.0)); }
 
 	inline void set_h(float p_h) { set_hsv(p_h, get_s(), get_v()); }
 	inline void set_s(float p_s) { set_hsv(get_h(), p_s, get_v()); }