Remove obsolete GLES3 backend

Due to the port to Vulkan and complete redesign of the rendering backend,
the `drivers/gles3` code is no longer usable in this state and is not
planned to be ported to the new architecture.

The GLES2 backend is kept (while still disabled and non-working) as it
will eventually be ported to serve as the low-end renderer for Godot 4.0.

Some GLES3 features might be selectively ported to the updated GLES2
backend if there's a need for them, and extensions we can use for that.

So long, OpenGL driver bugs!

6 files changed, 10 insertions, 29 deletions

diff --git a/platform/android/java/app/AndroidManifest.xml b/platform/android/java/app/AndroidManifest.xml
index 7e9ce70d80..4d2eb1ef65 100644
--- a/platform/android/java/app/AndroidManifest.xml
+++ b/platform/android/java/app/AndroidManifest.xml
@@ -15,7 +15,6 @@
         android:largeScreens="true"
         android:xlargeScreens="true" />
 
-    <!-- glEsVersion is modified by the exporter, changing this value here has no effect. -->
     <uses-feature
         android:glEsVersion="0x00020000"
         android:required="true" />
diff --git a/platform/android/java/lib/src/org/godotengine/godot/Godot.java b/platform/android/java/lib/src/org/godotengine/godot/Godot.java
index 2f6a93fbb1..021214b627 100644
--- a/platform/android/java/lib/src/org/godotengine/godot/Godot.java
+++ b/platform/android/java/lib/src/org/godotengine/godot/Godot.java
@@ -287,8 +287,6 @@ public abstract class Godot extends Activity implements SensorEventListener, IDo
 	 */
 	@Keep
 	private void onVideoInit() {
-		boolean use_gl3 = getGLESVersionCode() >= 0x00030000;
-
 		final FrameLayout layout = new FrameLayout(this);
 		layout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
 		setContentView(layout);
@@ -299,7 +297,7 @@ public abstract class Godot extends Activity implements SensorEventListener, IDo
 		// ...add to FrameLayout
 		layout.addView(edittext);
 
-		mView = new GodotView(this, xrMode, use_gl3, use_32_bits, use_debug_opengl);
+		mView = new GodotView(this, xrMode, use_32_bits, use_debug_opengl);
 		layout.addView(mView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
 		edittext.setView(mView);
 		io.setEdit(edittext);
diff --git a/platform/android/java/lib/src/org/godotengine/godot/GodotView.java b/platform/android/java/lib/src/org/godotengine/godot/GodotView.java
index f938583082..8d3c2ae319 100644
--- a/platform/android/java/lib/src/org/godotengine/godot/GodotView.java
+++ b/platform/android/java/lib/src/org/godotengine/godot/GodotView.java
@@ -73,9 +73,8 @@ public class GodotView extends GLSurfaceView {
 	private final GestureDetector detector;
 	private final GodotRenderer godotRenderer;
 
-	public GodotView(Godot activity, XRMode xrMode, boolean p_use_gl3, boolean p_use_32_bits, boolean p_use_debug_opengl) {
+	public GodotView(Godot activity, XRMode xrMode, boolean p_use_32_bits, boolean p_use_debug_opengl) {
 		super(activity);
-		GLUtils.use_gl3 = p_use_gl3;
 		GLUtils.use_32 = p_use_32_bits;
 		GLUtils.use_debug_opengl = p_use_debug_opengl;
 
diff --git a/platform/android/java/lib/src/org/godotengine/godot/utils/GLUtils.java b/platform/android/java/lib/src/org/godotengine/godot/utils/GLUtils.java
index bbf876ea1f..9d29551f89 100644
--- a/platform/android/java/lib/src/org/godotengine/godot/utils/GLUtils.java
+++ b/platform/android/java/lib/src/org/godotengine/godot/utils/GLUtils.java
@@ -44,7 +44,6 @@ public class GLUtils {
 
 	public static final boolean DEBUG = false;
 
-	public static boolean use_gl3 = false;
 	public static boolean use_32 = false;
 	public static boolean use_debug_opengl = false;
 
diff --git a/platform/android/java/lib/src/org/godotengine/godot/xr/regular/RegularConfigChooser.java b/platform/android/java/lib/src/org/godotengine/godot/xr/regular/RegularConfigChooser.java
index ce4defd7a7..8409e37f8f 100644
--- a/platform/android/java/lib/src/org/godotengine/godot/xr/regular/RegularConfigChooser.java
+++ b/platform/android/java/lib/src/org/godotengine/godot/xr/regular/RegularConfigChooser.java
@@ -45,6 +45,8 @@ public class RegularConfigChooser implements GLSurfaceView.EGLConfigChooser {
 
 	private int[] mValue = new int[1];
 
+	// FIXME: Add support for Vulkan.
+
 	/* This EGL config specification is used to specify 2.0 rendering.
 	 * We use a minimum size of 4 bits for red/green/blue, but will
 	 * perform actual matching in chooseConfig() below.
@@ -59,15 +61,6 @@ public class RegularConfigChooser implements GLSurfaceView.EGLConfigChooser {
 		EGL10.EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
 		EGL10.EGL_NONE
 	};
-	private static int[] s_configAttribs3 = {
-		EGL10.EGL_RED_SIZE, 4,
-		EGL10.EGL_GREEN_SIZE, 4,
-		EGL10.EGL_BLUE_SIZE, 4,
-		// EGL10.EGL_DEPTH_SIZE,     16,
-		//  EGL10.EGL_STENCIL_SIZE,   EGL10.EGL_DONT_CARE,
-		EGL10.EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT, //apparently there is no EGL_OPENGL_ES3_BIT
-		EGL10.EGL_NONE
-	};
 
 	public RegularConfigChooser(int r, int g, int b, int a, int depth, int stencil) {
 		mRedSize = r;
@@ -83,7 +76,7 @@ public class RegularConfigChooser implements GLSurfaceView.EGLConfigChooser {
 		/* Get the number of minimally matching EGL configurations
 		 */
 		int[] num_config = new int[1];
-		egl.eglChooseConfig(display, GLUtils.use_gl3 ? s_configAttribs3 : s_configAttribs2, null, 0, num_config);
+		egl.eglChooseConfig(display, s_configAttribs2, null, 0, num_config);
 
 		int numConfigs = num_config[0];
 
@@ -94,7 +87,7 @@ public class RegularConfigChooser implements GLSurfaceView.EGLConfigChooser {
 		/* Allocate then read the array of minimally matching EGL configs
 		 */
 		EGLConfig[] configs = new EGLConfig[numConfigs];
-		egl.eglChooseConfig(display, GLUtils.use_gl3 ? s_configAttribs3 : s_configAttribs2, configs, numConfigs, num_config);
+		egl.eglChooseConfig(display, s_configAttribs2, configs, numConfigs, num_config);
 
 		if (GLUtils.DEBUG) {
 			GLUtils.printConfigs(egl, display, configs);
diff --git a/platform/android/java/lib/src/org/godotengine/godot/xr/regular/RegularContextFactory.java b/platform/android/java/lib/src/org/godotengine/godot/xr/regular/RegularContextFactory.java
index 22bd4ced87..f2b4c95a2c 100644
--- a/platform/android/java/lib/src/org/godotengine/godot/xr/regular/RegularContextFactory.java
+++ b/platform/android/java/lib/src/org/godotengine/godot/xr/regular/RegularContextFactory.java
@@ -52,24 +52,17 @@ public class RegularContextFactory implements GLSurfaceView.EGLContextFactory {
 
 	public EGLContext createContext(EGL10 egl, EGLDisplay display, EGLConfig eglConfig) {
 		String driver_name = GodotLib.getGlobal("rendering/quality/driver/driver_name");
-		if (GLUtils.use_gl3 && !driver_name.equals("GLES3")) {
-			GLUtils.use_gl3 = false;
-		}
-		if (GLUtils.use_gl3)
-			Log.w(TAG, "creating OpenGL ES 3.0 context :");
-		else
-			Log.w(TAG, "creating OpenGL ES 2.0 context :");
+		// FIXME: Add support for Vulkan.
+		Log.w(TAG, "creating OpenGL ES 2.0 context :");
 
 		GLUtils.checkEglError(TAG, "Before eglCreateContext", egl);
 		EGLContext context;
 		if (GLUtils.use_debug_opengl) {
 			int[] attrib_list2 = { EGL_CONTEXT_CLIENT_VERSION, 2, _EGL_CONTEXT_FLAGS_KHR, _EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR, EGL10.EGL_NONE };
-			int[] attrib_list3 = { EGL_CONTEXT_CLIENT_VERSION, 3, _EGL_CONTEXT_FLAGS_KHR, _EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR, EGL10.EGL_NONE };
-			context = egl.eglCreateContext(display, eglConfig, EGL10.EGL_NO_CONTEXT, GLUtils.use_gl3 ? attrib_list3 : attrib_list2);
+			context = egl.eglCreateContext(display, eglConfig, EGL10.EGL_NO_CONTEXT, attrib_list2);
 		} else {
 			int[] attrib_list2 = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL10.EGL_NONE };
-			int[] attrib_list3 = { EGL_CONTEXT_CLIENT_VERSION, 3, EGL10.EGL_NONE };
-			context = egl.eglCreateContext(display, eglConfig, EGL10.EGL_NO_CONTEXT, GLUtils.use_gl3 ? attrib_list3 : attrib_list2);
+			context = egl.eglCreateContext(display, eglConfig, EGL10.EGL_NO_CONTEXT, attrib_list2);
 		}
 		GLUtils.checkEglError(TAG, "After eglCreateContext", egl);
 		return context;