Implement Curve3Texture

* This was required by users in some scenarios, such as animating individual axes over time with a single texture.
* Examples: Shaders, Particles, etc.
* CurveTexture now defaults to RGB, can be changed to Red if needed, this allows to freely exchange them.

5 files changed, 328 insertions, 17 deletions

diff --git a/doc/classes/Curve3Texture.xml b/doc/classes/Curve3Texture.xml
new file mode 100644
index 0000000000..1b352dff0d
--- /dev/null
+++ b/doc/classes/Curve3Texture.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="Curve3Texture" inherits="Texture2D" version="4.0">
+	<brief_description>
+	</brief_description>
+	<description>
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+	</methods>
+	<members>
+		<member name="curve_x" type="Curve" setter="set_curve_x" getter="get_curve_x">
+		</member>
+		<member name="curve_y" type="Curve" setter="set_curve_y" getter="get_curve_y">
+		</member>
+		<member name="curve_z" type="Curve" setter="set_curve_z" getter="get_curve_z">
+		</member>
+		<member name="width" type="int" setter="set_width" getter="get_width" default="2048">
+		</member>
+	</members>
+	<constants>
+	</constants>
+</class>
diff --git a/doc/classes/CurveTexture.xml b/doc/classes/CurveTexture.xml
index bc6b69d2d1..54065fe0f9 100644
--- a/doc/classes/CurveTexture.xml
+++ b/doc/classes/CurveTexture.xml
@@ -14,10 +14,16 @@
 		<member name="curve" type="Curve" setter="set_curve" getter="get_curve">
 			The [code]curve[/code] rendered onto the texture.
 		</member>
+		<member name="texture_mode" type="int" setter="set_texture_mode" getter="get_texture_mode" enum="CurveTexture.TextureMode" default="0">
+		</member>
 		<member name="width" type="int" setter="set_width" getter="get_width" default="2048">
 			The width of the texture.
 		</member>
 	</members>
 	<constants>
+		<constant name="TEXTURE_MODE_RGB" value="0" enum="TextureMode">
+		</constant>
+		<constant name="TEXTURE_MODE_RED" value="1" enum="TextureMode">
+		</constant>
 	</constants>
 </class>
diff --git a/scene/register_scene_types.cpp b/scene/register_scene_types.cpp
index d069d5e963..85bd08529c 100644
--- a/scene/register_scene_types.cpp
+++ b/scene/register_scene_types.cpp
@@ -774,6 +774,7 @@ void register_scene_types() {
 	ClassDB::register_class<AtlasTexture>();
 	ClassDB::register_class<MeshTexture>();
 	ClassDB::register_class<CurveTexture>();
+	ClassDB::register_class<Curve3Texture>();
 	ClassDB::register_class<GradientTexture>();
 	ClassDB::register_class<ProxyTexture>();
 	ClassDB::register_class<AnimatedTexture>();
diff --git a/scene/resources/texture.cpp b/scene/resources/texture.cpp
index 72031c3a69..b4d05fb545 100644
--- a/scene/resources/texture.cpp
+++ b/scene/resources/texture.cpp
@@ -1407,14 +1407,26 @@ void CurveTexture::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_curve", "curve"), &CurveTexture::set_curve);
 	ClassDB::bind_method(D_METHOD("get_curve"), &CurveTexture::get_curve);
 
+	ClassDB::bind_method(D_METHOD("set_texture_mode", "texture_mode"), &CurveTexture::set_texture_mode);
+	ClassDB::bind_method(D_METHOD("get_texture_mode"), &CurveTexture::get_texture_mode);
+
 	ClassDB::bind_method(D_METHOD("_update"), &CurveTexture::_update);
 
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "width", PROPERTY_HINT_RANGE, "32,4096"), "set_width", "get_width");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "texture_mode", PROPERTY_HINT_ENUM, "RGB,Red"), "set_texture_mode", "get_texture_mode");
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "curve", PROPERTY_HINT_RESOURCE_TYPE, "Curve"), "set_curve", "get_curve");
+
+	BIND_ENUM_CONSTANT(TEXTURE_MODE_RGB);
+	BIND_ENUM_CONSTANT(TEXTURE_MODE_RED);
 }
 
 void CurveTexture::set_width(int p_width) {
 	ERR_FAIL_COND(p_width < 32 || p_width > 4096);
+
+	if (_width == p_width) {
+		return;
+	}
+
 	_width = p_width;
 	_update();
 }
@@ -1450,7 +1462,7 @@ void CurveTexture::set_curve(Ref<Curve> p_curve) {
 
 void CurveTexture::_update() {
 	Vector<uint8_t> data;
-	data.resize(_width * sizeof(float));
+	data.resize(_width * sizeof(float) * (texture_mode == TEXTURE_MODE_RGB ? 3 : 1));
 
 	// The array is locked in that scope
 	{
@@ -1461,24 +1473,42 @@ void CurveTexture::_update() {
 			Curve &curve = **_curve;
 			for (int i = 0; i < _width; ++i) {
 				float t = i / static_cast<float>(_width);
-				wd[i] = curve.interpolate_baked(t);
+				if (texture_mode == TEXTURE_MODE_RGB) {
+					wd[i * 3 + 0] = curve.interpolate_baked(t);
+					wd[i * 3 + 1] = wd[i * 3 + 0];
+					wd[i * 3 + 2] = wd[i * 3 + 0];
+				} else {
+					wd[i] = curve.interpolate_baked(t);
+				}
 			}
 
 		} else {
 			for (int i = 0; i < _width; ++i) {
-				wd[i] = 0;
+				if (texture_mode == TEXTURE_MODE_RGB) {
+					wd[i * 3 + 0] = 0;
+					wd[i * 3 + 1] = 0;
+					wd[i * 3 + 2] = 0;
+				} else {
+					wd[i] = 0;
+				}
 			}
 		}
 	}
 
-	Ref<Image> image = memnew(Image(_width, 1, false, Image::FORMAT_RF, data));
+	Ref<Image> image = memnew(Image(_width, 1, false, texture_mode == TEXTURE_MODE_RGB ? Image::FORMAT_RGBF : Image::FORMAT_RF, data));
 
 	if (_texture.is_valid()) {
-		RID new_texture = RS::get_singleton()->texture_2d_create(image);
-		RS::get_singleton()->texture_replace(_texture, new_texture);
+		if (_current_texture_mode != texture_mode || _current_width != _width) {
+			RID new_texture = RS::get_singleton()->texture_2d_create(image);
+			RS::get_singleton()->texture_replace(_texture, new_texture);
+		} else {
+			RS::get_singleton()->texture_2d_update(_texture, image);
+		}
 	} else {
 		_texture = RS::get_singleton()->texture_2d_create(image);
 	}
+	_current_texture_mode = texture_mode;
+	_current_width = _width;
 
 	emit_changed();
 }
@@ -1487,6 +1517,17 @@ Ref<Curve> CurveTexture::get_curve() const {
 	return _curve;
 }
 
+void CurveTexture::set_texture_mode(TextureMode p_mode) {
+	if (texture_mode == p_mode) {
+		return;
+	}
+	texture_mode = p_mode;
+	_update();
+}
+CurveTexture::TextureMode CurveTexture::get_texture_mode() const {
+	return texture_mode;
+}
+
 RID CurveTexture::get_rid() const {
 	if (!_texture.is_valid()) {
 		_texture = RS::get_singleton()->texture_2d_placeholder_create();
@@ -1504,6 +1545,204 @@ CurveTexture::~CurveTexture() {
 
 //////////////////
 
+void Curve3Texture::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("set_width", "width"), &Curve3Texture::set_width);
+
+	ClassDB::bind_method(D_METHOD("set_curve_x", "curve"), &Curve3Texture::set_curve_x);
+	ClassDB::bind_method(D_METHOD("get_curve_x"), &Curve3Texture::get_curve_x);
+
+	ClassDB::bind_method(D_METHOD("set_curve_y", "curve"), &Curve3Texture::set_curve_y);
+	ClassDB::bind_method(D_METHOD("get_curve_y"), &Curve3Texture::get_curve_y);
+
+	ClassDB::bind_method(D_METHOD("set_curve_z", "curve"), &Curve3Texture::set_curve_z);
+	ClassDB::bind_method(D_METHOD("get_curve_z"), &Curve3Texture::get_curve_z);
+
+	ClassDB::bind_method(D_METHOD("_update"), &Curve3Texture::_update);
+
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "width", PROPERTY_HINT_RANGE, "32,4096"), "set_width", "get_width");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "curve_x", PROPERTY_HINT_RESOURCE_TYPE, "Curve"), "set_curve_x", "get_curve_x");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "curve_y", PROPERTY_HINT_RESOURCE_TYPE, "Curve"), "set_curve_y", "get_curve_y");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "curve_z", PROPERTY_HINT_RESOURCE_TYPE, "Curve"), "set_curve_z", "get_curve_z");
+}
+
+void Curve3Texture::set_width(int p_width) {
+	ERR_FAIL_COND(p_width < 32 || p_width > 4096);
+
+	if (_width == p_width) {
+		return;
+	}
+
+	_width = p_width;
+	_update();
+}
+
+int Curve3Texture::get_width() const {
+	return _width;
+}
+
+void Curve3Texture::ensure_default_setup(float p_min, float p_max) {
+	if (_curve_x.is_null()) {
+		Ref<Curve> curve = Ref<Curve>(memnew(Curve));
+		curve->add_point(Vector2(0, 1));
+		curve->add_point(Vector2(1, 1));
+		curve->set_min_value(p_min);
+		curve->set_max_value(p_max);
+		set_curve_x(curve);
+	}
+
+	if (_curve_y.is_null()) {
+		Ref<Curve> curve = Ref<Curve>(memnew(Curve));
+		curve->add_point(Vector2(0, 1));
+		curve->add_point(Vector2(1, 1));
+		curve->set_min_value(p_min);
+		curve->set_max_value(p_max);
+		set_curve_y(curve);
+	}
+
+	if (_curve_z.is_null()) {
+		Ref<Curve> curve = Ref<Curve>(memnew(Curve));
+		curve->add_point(Vector2(0, 1));
+		curve->add_point(Vector2(1, 1));
+		curve->set_min_value(p_min);
+		curve->set_max_value(p_max);
+		set_curve_z(curve);
+	}
+}
+
+void Curve3Texture::set_curve_x(Ref<Curve> p_curve) {
+	if (_curve_x != p_curve) {
+		if (_curve_x.is_valid()) {
+			_curve_x->disconnect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Curve3Texture::_update));
+		}
+		_curve_x = p_curve;
+		if (_curve_x.is_valid()) {
+			_curve_x->connect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Curve3Texture::_update), varray(), CONNECT_REFERENCE_COUNTED);
+		}
+		_update();
+	}
+}
+
+void Curve3Texture::set_curve_y(Ref<Curve> p_curve) {
+	if (_curve_y != p_curve) {
+		if (_curve_y.is_valid()) {
+			_curve_y->disconnect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Curve3Texture::_update));
+		}
+		_curve_y = p_curve;
+		if (_curve_y.is_valid()) {
+			_curve_y->connect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Curve3Texture::_update), varray(), CONNECT_REFERENCE_COUNTED);
+		}
+		_update();
+	}
+}
+
+void Curve3Texture::set_curve_z(Ref<Curve> p_curve) {
+	if (_curve_z != p_curve) {
+		if (_curve_z.is_valid()) {
+			_curve_z->disconnect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Curve3Texture::_update));
+		}
+		_curve_z = p_curve;
+		if (_curve_z.is_valid()) {
+			_curve_z->connect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Curve3Texture::_update), varray(), CONNECT_REFERENCE_COUNTED);
+		}
+		_update();
+	}
+}
+
+void Curve3Texture::_update() {
+	Vector<uint8_t> data;
+	data.resize(_width * sizeof(float) * 3);
+
+	// The array is locked in that scope
+	{
+		uint8_t *wd8 = data.ptrw();
+		float *wd = (float *)wd8;
+
+		if (_curve_x.is_valid()) {
+			Curve &curve_x = **_curve_x;
+			for (int i = 0; i < _width; ++i) {
+				float t = i / static_cast<float>(_width);
+				wd[i * 3 + 0] = curve_x.interpolate_baked(t);
+			}
+
+		} else {
+			for (int i = 0; i < _width; ++i) {
+				wd[i * 3 + 0] = 0;
+			}
+		}
+
+		if (_curve_y.is_valid()) {
+			Curve &curve_y = **_curve_y;
+			for (int i = 0; i < _width; ++i) {
+				float t = i / static_cast<float>(_width);
+				wd[i * 3 + 1] = curve_y.interpolate_baked(t);
+			}
+
+		} else {
+			for (int i = 0; i < _width; ++i) {
+				wd[i * 3 + 1] = 0;
+			}
+		}
+
+		if (_curve_z.is_valid()) {
+			Curve &curve_z = **_curve_z;
+			for (int i = 0; i < _width; ++i) {
+				float t = i / static_cast<float>(_width);
+				wd[i * 3 + 2] = curve_z.interpolate_baked(t);
+			}
+
+		} else {
+			for (int i = 0; i < _width; ++i) {
+				wd[i * 3 + 2] = 0;
+			}
+		}
+	}
+
+	Ref<Image> image = memnew(Image(_width, 1, false, Image::FORMAT_RGBF, data));
+
+	if (_texture.is_valid()) {
+		if (_current_width != _width) {
+			RID new_texture = RS::get_singleton()->texture_2d_create(image);
+			RS::get_singleton()->texture_replace(_texture, new_texture);
+		} else {
+			RS::get_singleton()->texture_2d_update(_texture, image);
+		}
+	} else {
+		_texture = RS::get_singleton()->texture_2d_create(image);
+	}
+	_current_width = _width;
+
+	emit_changed();
+}
+
+Ref<Curve> Curve3Texture::get_curve_x() const {
+	return _curve_x;
+}
+
+Ref<Curve> Curve3Texture::get_curve_y() const {
+	return _curve_y;
+}
+
+Ref<Curve> Curve3Texture::get_curve_z() const {
+	return _curve_z;
+}
+
+RID Curve3Texture::get_rid() const {
+	if (!_texture.is_valid()) {
+		_texture = RS::get_singleton()->texture_2d_placeholder_create();
+	}
+	return _texture;
+}
+
+Curve3Texture::Curve3Texture() {}
+
+Curve3Texture::~Curve3Texture() {
+	if (_texture.is_valid()) {
+		RS::get_singleton()->free(_texture);
+	}
+}
+
+//////////////////
+
 GradientTexture::GradientTexture() {
 	_queue_update();
 }
diff --git a/scene/resources/texture.h b/scene/resources/texture.h
index 40193e3ff6..73390039cb 100644
--- a/scene/resources/texture.h
+++ b/scene/resources/texture.h
@@ -586,11 +586,19 @@ public:
 class CurveTexture : public Texture2D {
 	GDCLASS(CurveTexture, Texture2D);
 	RES_BASE_EXTENSION("curvetex")
+public:
+	enum TextureMode {
+		TEXTURE_MODE_RGB,
+		TEXTURE_MODE_RED,
+	};
 
 private:
 	mutable RID _texture;
 	Ref<Curve> _curve;
 	int _width = 2048;
+	int _current_width = 0;
+	TextureMode texture_mode = TEXTURE_MODE_RGB;
+	TextureMode _current_texture_mode = TEXTURE_MODE_RGB;
 
 	void _update();
 
@@ -601,6 +609,9 @@ public:
 	void set_width(int p_width);
 	int get_width() const override;
 
+	void set_texture_mode(TextureMode p_mode);
+	TextureMode get_texture_mode() const;
+
 	void ensure_default_setup(float p_min = 0, float p_max = 1);
 
 	void set_curve(Ref<Curve> p_curve);
@@ -614,18 +625,49 @@ public:
 	CurveTexture();
 	~CurveTexture();
 };
-/*
-	enum CubeMapSide {
-		CUBEMAP_LEFT,
-		CUBEMAP_RIGHT,
-		CUBEMAP_BOTTOM,
-		CUBEMAP_TOP,
-		CUBEMAP_FRONT,
-		CUBEMAP_BACK,
-	};
 
-*/
-//VARIANT_ENUM_CAST( Texture::CubeMapSide );
+VARIANT_ENUM_CAST(CurveTexture::TextureMode)
+
+class Curve3Texture : public Texture2D {
+	GDCLASS(Curve3Texture, Texture2D);
+	RES_BASE_EXTENSION("curvetex")
+
+private:
+	mutable RID _texture;
+	Ref<Curve> _curve_x;
+	Ref<Curve> _curve_y;
+	Ref<Curve> _curve_z;
+	int _width = 2048;
+	int _current_width = 0;
+
+	void _update();
+
+protected:
+	static void _bind_methods();
+
+public:
+	void set_width(int p_width);
+	int get_width() const override;
+
+	void ensure_default_setup(float p_min = 0, float p_max = 1);
+
+	void set_curve_x(Ref<Curve> p_curve);
+	Ref<Curve> get_curve_x() const;
+
+	void set_curve_y(Ref<Curve> p_curve);
+	Ref<Curve> get_curve_y() const;
+
+	void set_curve_z(Ref<Curve> p_curve);
+	Ref<Curve> get_curve_z() const;
+
+	virtual RID get_rid() const override;
+
+	virtual int get_height() const override { return 1; }
+	virtual bool has_alpha() const override { return false; }
+
+	Curve3Texture();
+	~Curve3Texture();
+};
 
 class GradientTexture : public Texture2D {
 	GDCLASS(GradientTexture, Texture2D);