[macOS/Windows] Add optional ANGLE backed OpenGL renderer support (runtime backend selection).

COPYRIGHT.txt

@@ -141,6 +141,11 @@ Comment: AMD FidelityFX Super Resolution
 Copyright: 2021, Advanced Micro Devices, Inc.
 License: Expat
 
+Files: ./thirdparty/angle/
+Comment: ANGLE
+Copyright: 2018, The ANGLE Project Authors.
+License: BSD-3-clause
+
 Files: ./thirdparty/astcenc/
 Comment: Arm ASTC Encoder
 Copyright: 2011-2023, Arm Limited

SConstruct

@@ -579,6 +579,8 @@ if selected_platform in platform_list:
         if env["debug_symbols"]:
             env.Append(CCFLAGS=["/Zi", "/FS"])
             env.Append(LINKFLAGS=["/DEBUG:FULL"])
+        else:
+            env.Append(LINKFLAGS=["/DEBUG:NONE"])
 
         if env["optimize"] == "speed":
             env.Append(CCFLAGS=["/O2"])

doc/classes/DisplayServer.xml

@@ -1891,9 +1891,9 @@
 		</constant>
 		<constant name="OPENGL_CONTEXT" value="3" enum="HandleType">
 			OpenGL context (only with the GL Compatibility renderer):
-			- Windows: [code]HGLRC[/code] for the window.
+			- Windows: [code]HGLRC[/code] for the window (native GL), or [code]EGLContext[/code] for the window (ANGLE).
 			- Linux: [code]GLXContext*[/code] for the window.
-			- macOS: [code]NSOpenGLContext*[/code] for the window.
+			- macOS: [code]NSOpenGLContext*[/code] for the window (native GL), or [code]EGLContext[/code] for the window (ANGLE).
 			- Android: [code]EGLContext[/code] for the window.
 		</constant>
 		<constant name="TTS_UTTERANCE_STARTED" value="0" enum="TTSUtteranceEvent">

drivers/SCsub

@@ -28,6 +28,7 @@ if env["vulkan"]:
 if env["opengl3"]:
     SConscript("gl_context/SCsub")
     SConscript("gles3/SCsub")
+    SConscript("egl/SCsub")
 
 # Core dependencies
 SConscript("png/SCsub")

drivers/egl/SCsub

@@ -0,0 +1,6 @@
+#!/usr/bin/env python
+
+Import("env")
+
+# Godot source files
+env.add_source_files(env.drivers_sources, "*.cpp")