Fix 3D scaling enum size in the editor and improve descriptions

doc/classes/RenderingServer.xml

@@ -3932,10 +3932,10 @@
 			[FogVolume] will have no shape, will cover the whole world and will not be culled.
 		</constant>
 		<constant name="VIEWPORT_SCALING_3D_MODE_BILINEAR" value="0" enum="ViewportScaling3DMode">
-			Enables bilinear scaling on 3D viewports. The amount of scaling can be set using [member Viewport.scaling_3d_scale]. Values less then [code]1.0[/code] will result in undersampling while values greater than [code]1.0[/code] will result in supersampling. A value of [code]1.0[/code] disables scaling.
+			Use bilinear scaling for the viewport's 3D buffer. The amount of scaling can be set using [member Viewport.scaling_3d_scale]. Values less then [code]1.0[/code] will result in undersampling while values greater than [code]1.0[/code] will result in supersampling. A value of [code]1.0[/code] disables scaling.
 		</constant>
 		<constant name="VIEWPORT_SCALING_3D_MODE_FSR" value="1" enum="ViewportScaling3DMode">
-			Enables FSR upscaling on 3D viewports. The amount of scaling can be set using [member Viewport.scaling_3d_scale]. Values less then [code]1.0[/code] will be result in the viewport being upscaled using FSR. Values greater than [code]1.0[/code] are not supported and bilinear supersampling will be used instead. A value of [code]1.0[/code] disables scaling.
+			Use AMD FidelityFX Super Resolution 1.0 upscaling for the viewport's 3D buffer. The amount of scaling can be set using [member Viewport.scaling_3d_scale]. Values less then [code]1.0[/code] will be result in the viewport being upscaled using FSR. Values greater than [code]1.0[/code] are not supported and bilinear downsampling will be used instead. A value of [code]1.0[/code] disables scaling.
 		</constant>
 		<constant name="VIEWPORT_SCALING_3D_MODE_MAX" value="2" enum="ViewportScaling3DMode">
 		</constant>

doc/classes/Viewport.xml

@@ -332,10 +332,10 @@
 			Represents the size of the [enum ShadowAtlasQuadrantSubdiv] enum.
 		</constant>
 		<constant name="SCALING_3D_MODE_BILINEAR" value="0" enum="Scaling3DMode">
-			Enables bilinear scaling on 3D viewports. The amount of scaling can be set using [member scaling_3d_scale]. Values less then [code]1.0[/code] will result in undersampling while values greater than [code]1.0[/code] will result in supersampling. A value of [code]1.0[/code] disables scaling.
+			Use bilinear scaling for the viewport's 3D buffer. The amount of scaling can be set using [member scaling_3d_scale]. Values less then [code]1.0[/code] will result in undersampling while values greater than [code]1.0[/code] will result in supersampling. A value of [code]1.0[/code] disables scaling.
 		</constant>
 		<constant name="SCALING_3D_MODE_FSR" value="1" enum="Scaling3DMode">
-			Enables FSR upscaling on 3D viewports. The amount of scaling can be set using [member scaling_3d_scale]. Values less then [code]1.0[/code] will be result in the viewport being upscaled using FSR. Values greater than [code]1.0[/code] are not supported and bilinear supersampling will be used instead. A value of [code]1.0[/code] disables scaling.
+			Use AMD FidelityFX Super Resolution 1.0 upscaling for the viewport's 3D buffer. The amount of scaling can be set using [member scaling_3d_scale]. Values less then [code]1.0[/code] will be result in the viewport being upscaled using FSR. Values greater than [code]1.0[/code] are not supported and bilinear downsampling will be used instead. A value of [code]1.0[/code] disables scaling.
 		</constant>
 		<constant name="SCALING_3D_MODE_MAX" value="2" enum="Scaling3DMode">
 			Represents the size of the [enum Scaling3DMode] enum.

scene/main/viewport.cpp

@@ -3744,7 +3744,7 @@ void Viewport::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "debug_draw", PROPERTY_HINT_ENUM, "Disabled,Unshaded,Overdraw,Wireframe"), "set_debug_draw", "get_debug_draw");
 #ifndef _3D_DISABLED
 	ADD_GROUP("Scaling 3D", "");
-	ADD_PROPERTY(PropertyInfo(Variant::INT, "scaling_3d_mode", PROPERTY_HINT_ENUM, "Disabled (Slowest),Bilinear (Fastest),FSR (Fast)"), "set_scaling_3d_mode", "get_scaling_3d_mode");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "scaling_3d_mode", PROPERTY_HINT_ENUM, "Bilinear (Fastest),FSR 1.0 (Fast)"), "set_scaling_3d_mode", "get_scaling_3d_mode");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "scaling_3d_scale", PROPERTY_HINT_RANGE, "0.25,2.0,0.01"), "set_scaling_3d_scale", "get_scaling_3d_scale");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "fsr_mipmap_bias", PROPERTY_HINT_RANGE, "-2,2,0.1"), "set_fsr_mipmap_bias", "get_fsr_mipmap_bias");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "fsr_sharpness", PROPERTY_HINT_RANGE, "0,2,0.1"), "set_fsr_sharpness", "get_fsr_sharpness");

servers/rendering/renderer_viewport.cpp

@@ -77,23 +77,21 @@ void RendererViewport::_configure_3d_render_buffers(Viewport *p_viewport) {
 			RSG::scene->free(p_viewport->render_buffers);
 			p_viewport->render_buffers = RID();
 		} else {
-			float scaling_3d_scale = p_viewport->scaling_3d_scale;
-
+			const float scaling_3d_scale = p_viewport->scaling_3d_scale;
 			RS::ViewportScaling3DMode scaling_3d_mode = p_viewport->scaling_3d_mode;
 			bool scaling_enabled = true;
 
 			if ((scaling_3d_mode == RS::VIEWPORT_SCALING_3D_MODE_FSR) && (scaling_3d_scale > 1.0)) {
-				// FSR is not design for downsampling.
-				// Throw a warning and fallback to VIEWPORT_SCALING_3D_MODE_BILINEAR
-				WARN_PRINT_ONCE("FSR 3D resolution scaling does not support supersampling. Falling back to bilinear scaling.");
+				// FSR is not designed for downsampling.
+				// Fall back to bilinear scaling.
 				scaling_3d_mode = RS::VIEWPORT_SCALING_3D_MODE_BILINEAR;
 			}
 
 			if ((scaling_3d_mode == RS::VIEWPORT_SCALING_3D_MODE_FSR) && !p_viewport->fsr_enabled) {
 				// FSR is not actually available.
-				// Throw a warning and fallback to disable scaling
-				WARN_PRINT_ONCE("FSR 3D resolution scaling is not available. Disabling 3D resolution scaling.");
-				scaling_enabled = false;
+				// Fall back to bilinear scaling.
+				WARN_PRINT_ONCE("FSR 1.0 3D resolution scaling is not available. Falling back to bilinear 3D resolution scaling.");
+				scaling_3d_mode = RS::VIEWPORT_SCALING_3D_MODE_BILINEAR;
 			}
 
 			if (scaling_3d_scale == 1.0) {