Improve outdated README files and improve simple C++ demo

cpp/simple/README.md

@@ -0,0 +1,30 @@
+# Simple GDNative C++ demo
+
+This is a small example using C++ to create a GDNative script
+that just showcases some very simple bare bones calls.
+
+Language: C++
+
+Renderer: GLES 2
+
+Dependencies:
+ * You need [godot-cpp](https://github.com/godotengine/godot-cpp),
+   this is now a Git submodule of this repo.
+ * `clang`, `gcc`, or any decent C++ compiler that's C++14 compatible.
+
+## Compiling
+
+You can use SCons to compile the library:
+
+```
+scons platform=PLATFORM
+```
+
+Where PLATFORM is: `windows`, `linux`, or `osx`.
+
+This creates the file `libsimple` in the respective
+subfolders in the `project/gdnative` directory.
+
+## Screenshots
+
+![Screenshot](screenshots/screenshot.png)

cpp/simple/project/default_env.tres

@@ -1,18 +0,0 @@
-[gd_resource type="Environment" load_steps=2 format=2]
-
-[sub_resource type="ProceduralSky" id=1]
-radiance_size = 4
-sky_top_color = Color( 0.0470588, 0.454902, 0.976471, 1 )
-sky_horizon_color = Color( 0.556863, 0.823529, 0.909804, 1 )
-sky_curve = 0.25
-ground_bottom_color = Color( 0.101961, 0.145098, 0.188235, 1 )
-ground_horizon_color = Color( 0.482353, 0.788235, 0.952941, 1 )
-ground_curve = 0.01
-sun_energy = 16.0
-
-[resource]
-background_mode = 2
-background_sky = SubResource( 1 )
-fog_height_min = 0.0
-fog_height_max = 100.0
-ssao_quality = 0

cpp/simple/project/main.tscn

@@ -24,7 +24,7 @@ __meta__ = {
 "_edit_use_anchors_": false
 }
 
-[node name="Sprite" type="Sprite" parent="."]
+[node name="SimpleSprite" type="Sprite" parent="."]
 position = Vector2( 100, 100 )
 texture = ExtResource( 2 )
 script = ExtResource( 3 )

cpp/simple/project/project.godot

@@ -14,11 +14,14 @@ _global_script_class_icons={
 
 [application]
 
-config/name="New Game Project"
+config/name="Simple GDNative C++ demo"
 run/main_scene="res://main.tscn"
 config/icon="res://icon.png"
 
 [rendering]
 
-quality/driver/fallback_to_gles2=true
-environment/default_environment="res://default_env.tres"
+quality/driver/driver_name="GLES2"
+quality/intended_usage/framebuffer_allocation=0
+quality/intended_usage/framebuffer_allocation.mobile=0
+vram_compression/import_etc=true
+vram_compression/import_etc2=false

cpp/simple/src/Simple.cpp

@@ -19,16 +19,17 @@ void SimpleSprite::_register_methods() {
 }
 
 // `_init` doesn't need to be registered in `_register_methods`.
+// `_init` is always required, if you exclude it then Godot will crash.
 void SimpleSprite::_init() {
 	godot::Godot::print("A SimpleSprite was initialized in GDNative!");
 }
 
-void SimpleSprite::_process(double delta) {
+void SimpleSprite::_process(double p_delta) {
 	godot::Input *input = godot::Input::get_singleton();
 	godot::Vector2 input_dir(0, 0);
 
 	input_dir.x = input->get_action_strength("ui_right") - input->get_action_strength("ui_left");
 	input_dir.y = input->get_action_strength("ui_down") - input->get_action_strength("ui_up");
 
-	set_position(get_position() + input_dir.normalized() * delta * 300);
+	set_position(get_position() + input_dir.normalized() * p_delta * 300);
 }

cpp/simple/src/Simple.hpp

@@ -1,3 +1,6 @@
+#ifndef SIMPLE_H
+#define SIMPLE_H
+
 #include <Godot.hpp>
 
 #include <Reference.hpp>
@@ -24,5 +27,7 @@ public:
 
 	void _init();
 
-	void _process(double delta);
+	void _process(double p_delta);
 };
+
+#endif // SIMPLE_H