Use OpenGL 3.3 core profile instead of compatibility profile

- Rename OpenGL to GLES3 in the source code per community feedback.
  - The renderer is still exposed as "OpenGL 3" to the user.
- Hide renderer selection dropdown until OpenGL support is more mature.
  - The renderer can still be changed in the Project Settings or using
    the `--rendering-driver opengl` command line argument.
- Remove commented out exporter code.
- Remove some OpenGL/DisplayServer-related debugging prints.

SConstruct

@@ -15,7 +15,7 @@ from collections import OrderedDict
 # Local
 import methods
 import glsl_builders
-import opengl_builders
+import gles3_builders
 from platform_methods import run_in_subprocess
 
 # Scan possible build platforms
@@ -711,8 +711,8 @@ if selected_platform in platform_list:
     if not env["platform"] == "server":
         env.Append(
             BUILDERS={
-                "OpenGL_GLSL": env.Builder(
-                    action=run_in_subprocess(opengl_builders.build_opengl_headers),
+                "GLES3_GLSL": env.Builder(
+                    action=run_in_subprocess(gles3_builders.build_gles3_headers),
                     suffix="glsl.gen.h",
                     src_suffix=".glsl",
                 )

core/core_bind.cpp

@@ -604,7 +604,7 @@ void OS::_bind_methods() {
 	ADD_PROPERTY_DEFAULT("low_processor_usage_mode_sleep_usec", 6900);
 
 	BIND_ENUM_CONSTANT(VIDEO_DRIVER_VULKAN);
-	BIND_ENUM_CONSTANT(VIDEO_DRIVER_OPENGL);
+	BIND_ENUM_CONSTANT(VIDEO_DRIVER_OPENGL_3);
 
 	BIND_ENUM_CONSTANT(DAY_SUNDAY);
 	BIND_ENUM_CONSTANT(DAY_MONDAY);

core/core_bind.h

@@ -120,7 +120,7 @@ class OS : public Object {
 public:
 	enum VideoDriver {
 		VIDEO_DRIVER_VULKAN,
-		VIDEO_DRIVER_OPENGL,
+		VIDEO_DRIVER_OPENGL_3,
 	};
 
 	enum Weekday {

doc/classes/OS.xml

@@ -456,10 +456,10 @@
 	</members>
 	<constants>
 		<constant name="VIDEO_DRIVER_VULKAN" value="0" enum="VideoDriver">
-			The Vulkan rendering backend.
+			The Vulkan rendering backend. It requires Vulkan 1.0 support and automatically uses features from Vulkan 1.1 and 1.2 if available.
 		</constant>
-		<constant name="VIDEO_DRIVER_OPENGL" value="1" enum="VideoDriver">
-			The OpenGL rendering backend. It uses OpenGL ES 3.0 on mobile devices, OpenGL 3.3 on desktop platforms and WebGL 2.0 on the web.
+		<constant name="VIDEO_DRIVER_OPENGL_3" value="1" enum="VideoDriver">
+			The OpenGL 3 rendering backend. It uses OpenGL 3.3 Core Profile on desktop platforms, OpenGL ES 3.0 on mobile devices, and WebGL 2.0 on HTML5.
 		</constant>
 		<constant name="DAY_SUNDAY" value="0" enum="Weekday">
 			Sunday.

doc/classes/ProjectSettings.xml

@@ -1475,6 +1475,18 @@
 			The number of fixed iterations per second. This controls how often physics simulation and [method Node._physics_process] methods are run.
 			[b]Note:[/b] This property is only read when the project starts. To change the physics FPS at runtime, set [member Engine.physics_ticks_per_second] instead.
 		</member>
+		<member name="rendering/2d/opengl/batching_send_null" type="int" setter="" getter="" default="0">
+		</member>
+		<member name="rendering/2d/opengl/batching_stream" type="int" setter="" getter="" default="0">
+		</member>
+		<member name="rendering/2d/opengl/legacy_orphan_buffers" type="int" setter="" getter="" default="0">
+		</member>
+		<member name="rendering/2d/opengl/legacy_stream" type="int" setter="" getter="" default="0">
+		</member>
+		<member name="rendering/2d/options/ninepatch_mode" type="int" setter="" getter="" default="1">
+		</member>
+		<member name="rendering/2d/options/use_software_skinning" type="bool" setter="" getter="" default="true">
+		</member>
 		<member name="rendering/2d/sdf/oversize" type="int" setter="" getter="" default="1">
 		</member>
 		<member name="rendering/2d/sdf/scale" type="int" setter="" getter="" default="1">
@@ -1504,6 +1516,32 @@
 		</member>
 		<member name="rendering/anti_aliasing/screen_space_roughness_limiter/limit" type="float" setter="" getter="" default="0.18">
 		</member>
+		<member name="rendering/batching/debug/diagnose_frame" type="bool" setter="" getter="" default="false">
+		</member>
+		<member name="rendering/batching/debug/flash_batching" type="bool" setter="" getter="" default="false">
+		</member>
+		<member name="rendering/batching/lights/max_join_items" type="int" setter="" getter="" default="32">
+		</member>
+		<member name="rendering/batching/lights/scissor_area_threshold" type="float" setter="" getter="" default="1.0">
+		</member>
+		<member name="rendering/batching/options/single_rect_fallback" type="bool" setter="" getter="" default="false">
+		</member>
+		<member name="rendering/batching/options/use_batching" type="bool" setter="" getter="" default="false">
+		</member>
+		<member name="rendering/batching/options/use_batching_in_editor" type="bool" setter="" getter="" default="false">
+		</member>
+		<member name="rendering/batching/parameters/batch_buffer_size" type="int" setter="" getter="" default="16384">
+		</member>
+		<member name="rendering/batching/parameters/colored_vertex_format_threshold" type="float" setter="" getter="" default="0.25">
+		</member>
+		<member name="rendering/batching/parameters/item_reordering_lookahead" type="int" setter="" getter="" default="4">
+		</member>
+		<member name="rendering/batching/parameters/max_join_item_commands" type="int" setter="" getter="" default="16">
+		</member>
+		<member name="rendering/batching/precision/uv_contract" type="bool" setter="" getter="" default="false">
+		</member>
+		<member name="rendering/batching/precision/uv_contract_amount" type="int" setter="" getter="" default="100">
+		</member>
 		<member name="rendering/camera/depth_of_field/depth_of_field_bokeh_quality" type="int" setter="" getter="" default="1">
 			Sets the quality of the depth of field effect. Higher quality takes more samples, which is slower but looks smoother.
 		</member>
@@ -1585,6 +1623,10 @@
 		<member name="rendering/environment/volumetric_fog/volume_size" type="int" setter="" getter="" default="64">
 			Base size used to determine size of froxel buffer in the camera X-axis and Y-axis. The final size is scaled by the aspect ratio of the screen, so actual values may differ from what is set. Set a larger size for more detailed fog, set a smaller size for better performance.
 		</member>
+		<member name="rendering/gles2/compatibility/disable_half_float" type="bool" setter="" getter="" default="false">
+		</member>
+		<member name="rendering/gles2/compatibility/enable_high_float.Android" type="bool" setter="" getter="" default="false">
+		</member>
 		<member name="rendering/global_illumination/gi/use_half_resolution" type="bool" setter="" getter="" default="false">
 		</member>
 		<member name="rendering/global_illumination/sdfgi/frames_to_converge" type="int" setter="" getter="" default="4">

drivers/SCsub

@@ -25,7 +25,7 @@ SConscript("winmidi/SCsub")
 # Graphics drivers
 if env["vulkan"]:
     SConscript("vulkan/SCsub")
-    SConscript("opengl/SCsub")
+    SConscript("gles3/SCsub")
     SConscript("gl_context/SCsub")
 else:
     SConscript("dummy/SCsub")

drivers/opengl/rasterizer_array.h → drivers/gles3/rasterizer_array.h

@@ -35,7 +35,7 @@
  * Fast single-threaded growable array for POD types.
  * For use in render drivers, not for general use.
  * TO BE REPLACED by local_vector.
-*/
+ */
 
 #include "core/os/memory.h"
 #include <string.h>
@@ -47,13 +47,13 @@
 // which can be cast to whatever vertex format FVF required, and is initially
 // created with enough memory to hold the biggest FVF.
 // This allows multiple FVFs to use the same array.
-class RasterizerUnitArrayOpenGL {
+class RasterizerUnitArrayGLES3 {
 public:
-	RasterizerUnitArrayOpenGL() {
+	RasterizerUnitArrayGLES3() {
 		_list = nullptr;
 		free();
 	}
-	~RasterizerUnitArrayOpenGL() { free(); }
+	~RasterizerUnitArrayGLES3() { free(); }
 
 	uint8_t *get_unit(unsigned int ui) { return &_list[ui * _unit_size_bytes]; }
 	const uint8_t *get_unit(unsigned int ui) const { return &_list[ui * _unit_size_bytes]; }