Added button state textures + block colour progress bars

extension/src/openvic-extension/classes/GFXButtonStateTexture.cpp

@@ -0,0 +1,106 @@
+#include "GFXButtonStateTexture.hpp"
+
+#include "openvic-extension/utility/ClassBindings.hpp"
+
+using namespace OpenVic;
+using namespace godot;
+
+void GFXButtonStateTexture::_bind_methods() {
+	OV_BIND_METHOD(GFXButtonStateTexture::set_button_state, { "new_button_state" });
+	OV_BIND_METHOD(GFXButtonStateTexture::get_button_state);
+
+	OV_BIND_SMETHOD(get_generate_state_image_func_name);
+
+	OV_BIND_SMETHOD(button_state_to_theme_name, { "button_state" });
+	OV_BIND_METHOD(GFXButtonStateTexture::get_button_state_theme);
+
+	OV_BIND_METHOD(GFXButtonStateTexture::generate_state_image, { "source_image" });
+
+	BIND_ENUM_CONSTANT(HOVER);
+	BIND_ENUM_CONSTANT(PRESSED);
+	BIND_ENUM_CONSTANT(DISABLED);
+}
+
+GFXButtonStateTexture::GFXButtonStateTexture() : button_state { HOVER } {}
+
+Ref<GFXButtonStateTexture> GFXButtonStateTexture::make_gfx_button_state_texture(
+	ButtonState button_state, Ref<Image> const& source_image
+) {
+	Ref<GFXButtonStateTexture> button_state_texture;
+	button_state_texture.instantiate();
+	ERR_FAIL_NULL_V(button_state_texture, nullptr);
+	button_state_texture->set_button_state(button_state);
+	if (source_image.is_valid()) {
+		ERR_FAIL_COND_V(button_state_texture->generate_state_image(source_image) != OK, nullptr);
+	}
+	return button_state_texture;
+}
+
+void GFXButtonStateTexture::set_button_state(ButtonState new_button_state) {
+	ERR_FAIL_COND(new_button_state != HOVER && new_button_state != PRESSED && new_button_state != DISABLED);
+	button_state = new_button_state;
+}
+
+Error GFXButtonStateTexture::generate_state_image(Ref<Image> const& source_image) {
+	ERR_FAIL_COND_V(source_image.is_null() || source_image->is_empty(), FAILED);
+	/* Whether we've already set the ImageTexture to an image of the right dimensions and format,
+	* and so can update it without creating and setting a new image, or not. */
+	const bool can_update = state_image.is_valid() && state_image->get_size() == source_image->get_size()
+		&& state_image->get_format() == source_image->get_format();
+	if (!can_update) {
+		state_image = Image::create(source_image->get_width(), source_image->get_height(), false, source_image->get_format());
+		ERR_FAIL_NULL_V(state_image, FAILED);
+	}
+
+	static constexpr auto hover_colour = [](Color const& colour) -> Color {
+		return { std::min(colour.r + 0.1f, 1.0f), std::min(colour.g + 0.1f, 1.0f), std::min(colour.b + 0.1f, 1.0f), colour.a };
+	};
+	static constexpr auto pressed_colour = [](Color const& colour) -> Color {
+		return { std::max(colour.r - 0.1f, 0.0f), std::max(colour.g - 0.1f, 0.0f), std::max(colour.b - 0.1f, 0.0f), colour.a };
+	};
+	static constexpr auto disabled_colour = [](Color const& colour) -> Color {
+		const float luma = colour.get_luminance();
+		return { luma, luma, luma, colour.a };
+	};
+
+	const auto colour_func = button_state == HOVER ? hover_colour : button_state == PRESSED ? pressed_colour : disabled_colour;
+
+	for (Vector2i point { 0, 0 }; point.y < state_image->get_height(); ++point.y) {
+		for (point.x = 0; point.x < state_image->get_width(); ++point.x) {
+			state_image->set_pixelv(point, colour_func(source_image->get_pixelv(point)));
+		}
+	}
+
+	if (can_update) {
+		update(state_image);
+	} else {
+		set_image(state_image);
+	}
+	return OK;
+}
+
+StringName const& GFXButtonStateTexture::get_generate_state_image_func_name() {
+	static const StringName generate_state_image_func_name = "generate_state_image";
+	return generate_state_image_func_name;
+}
+
+StringName const& GFXButtonStateTexture::button_state_to_theme_name(ButtonState button_state) {
+	static const StringName theme_name_hover = "hover";
+	static const StringName theme_name_pressed = "pressed";
+	static const StringName theme_name_disabled = "disabled";
+	static const StringName theme_name_error = "";
+	switch (button_state) {
+		case HOVER:
+			return theme_name_hover;
+		case PRESSED:
+			return theme_name_pressed;
+		case DISABLED:
+			return theme_name_disabled;
+		default:
+			return theme_name_error;
+	}
+}
+
+StringName const& GFXButtonStateTexture::get_button_state_theme() const {
+	return button_state_to_theme_name(button_state);
+}

extension/src/openvic-extension/classes/GFXButtonStateTexture.hpp

@@ -0,0 +1,46 @@
+#pragma once
+
+#include <godot_cpp/classes/image_texture.hpp>
+
+#include <openvic-simulation/utility/Getters.hpp>
+
+namespace OpenVic {
+	class GFXButtonStateTexture : public godot::ImageTexture {
+		GDCLASS(GFXButtonStateTexture, godot::ImageTexture)
+
+	public:
+		enum ButtonState {
+			HOVER,
+			PRESSED,
+			DISABLED
+		};
+
+	private:
+		ButtonState PROPERTY(button_state);
+		godot::Ref<godot::Image> state_image;
+
+	protected:
+		static void _bind_methods();
+
+	public:
+		GFXButtonStateTexture();
+
+		/* Create a GFXButtonStateTexture using the specified godot::Image. Returns nullptr if generate_state_image fails. */
+		static godot::Ref<GFXButtonStateTexture> make_gfx_button_state_texture(
+			ButtonState button_state, godot::Ref<godot::Image> const& source_image = nullptr
+		);
+
+		/* Set the ButtonState to be generated by this class (calling this does not trigger state image generation). */
+		void set_button_state(ButtonState new_button_state);
+
+		/* Generate a modified version of source_image and update the underlying godot::ImageTexture to use it. */
+		godot::Error generate_state_image(godot::Ref<godot::Image> const& source_image);
+
+		static godot::StringName const& get_generate_state_image_func_name();
+
+		static godot::StringName const& button_state_to_theme_name(ButtonState button_state);
+		godot::StringName const& get_button_state_theme() const;
+	};
+}
+
+VARIANT_ENUM_CAST(OpenVic::GFXButtonStateTexture::ButtonState);

extension/src/openvic-extension/classes/GFXIconTexture.cpp

@@ -15,6 +15,11 @@ using OpenVic::Utilities::godot_to_std_string;
 using OpenVic::Utilities::std_view_to_godot_string;
 using OpenVic::Utilities::std_view_to_godot_string_name;
 
+StringName const& GFXIconTexture::_signal_image_updated() {
+	static const StringName signal_image_updated = "image_updated";
+	return signal_image_updated;
+}
+
 void GFXIconTexture::_bind_methods() {
 	OV_BIND_METHOD(GFXIconTexture::clear);
 
@@ -26,16 +31,32 @@ void GFXIconTexture::_bind_methods() {
 	OV_BIND_METHOD(GFXIconTexture::get_icon_count);
 
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "icon_index"), "set_icon_index", "get_icon_index");
+
+	ADD_SIGNAL(
+		MethodInfo(_signal_image_updated(), PropertyInfo(Variant::OBJECT, "source_image", PROPERTY_HINT_RESOURCE_TYPE, "Image"))
+	);
 }
 
 GFXIconTexture::GFXIconTexture()
 	: gfx_texture_sprite { nullptr }, icon_index { GFX::NO_FRAMES }, icon_count { GFX::NO_FRAMES } {}
 
-Ref<GFXIconTexture> GFXIconTexture::make_gfx_icon_texture(GFX::TextureSprite const* gfx_texture_sprite, GFX::frame_t icon) {
+Ref<GFXIconTexture> GFXIconTexture::make_gfx_icon_texture(
+	GFX::TextureSprite const* gfx_texture_sprite, GFX::frame_t icon,
+	std::vector<Ref<GFXButtonStateTexture>> const& button_state_textures
+) {
 	Ref<GFXIconTexture> icon_texture;
 	icon_texture.instantiate();
 	ERR_FAIL_NULL_V(icon_texture, nullptr);
-	icon_texture->set_gfx_texture_sprite(gfx_texture_sprite, icon);
+
+	for (Ref<GFXButtonStateTexture> const& button_state_texture : button_state_textures) {
+		icon_texture->connect(
+			_signal_image_updated(),
+			Callable { *button_state_texture, GFXButtonStateTexture::get_generate_state_image_func_name() },
+			CONNECT_PERSIST
+		);
+	}
+
+	ERR_FAIL_COND_V(icon_texture->set_gfx_texture_sprite(gfx_texture_sprite, icon) != OK, nullptr);
 	return icon_texture;
 }
 
@@ -57,9 +78,15 @@ Error GFXIconTexture::set_gfx_texture_sprite(GFX::TextureSprite const* new_gfx_t
 		ERR_FAIL_NULL_V(asset_manager, FAILED);
 
 		const StringName texture_file = std_view_to_godot_string_name(new_gfx_texture_sprite->get_texture_file());
+
+		/* Needed for GFXButtonStateTexture, AssetManager::get_texture will re-use this image from its internal cache. */
+		const Ref<Image> image = asset_manager->get_image(texture_file);
+		ERR_FAIL_NULL_V_MSG(image, FAILED, vformat("Failed to load image: %s", texture_file));
+
 		const Ref<ImageTexture> texture = asset_manager->get_texture(texture_file);
 		ERR_FAIL_NULL_V_MSG(texture, FAILED, vformat("Failed to load texture: %s", texture_file));
 
+		sprite_image = image;
 		gfx_texture_sprite = new_gfx_texture_sprite;
 		set_atlas(texture);
 		icon_index = GFX::NO_FRAMES;
@@ -98,6 +125,7 @@ Error GFXIconTexture::set_icon_index(int32_t new_icon_index) {
 		}
 		icon_index = GFX::NO_FRAMES;
 		set_region({ {}, size });
+		emit_signal(_signal_image_updated(), sprite_image);
 		return OK;
 	}
 	if (GFX::NO_FRAMES < new_icon_index && new_icon_index <= icon_count) {
@@ -111,5 +139,6 @@ Error GFXIconTexture::set_icon_index(int32_t new_icon_index) {
 		}
 	}
 	set_region({ (icon_index - 1) * size.x / icon_count, 0, size.x / icon_count, size.y });
+	emit_signal(_signal_image_updated(), sprite_image->get_region(get_region()));
 	return OK;
 }

extension/src/openvic-extension/classes/GFXIconTexture.hpp

@@ -4,6 +4,8 @@
 
 #include <openvic-simulation/interface/GFX.hpp>
 
+#include "openvic-extension/classes/GFXButtonStateTexture.hpp"
+
 namespace OpenVic {
 	class GFXIconTexture : public godot::AtlasTexture {
 		GDCLASS(GFXIconTexture, godot::AtlasTexture)
@@ -16,14 +18,22 @@ namespace OpenVic {
 		GFX::frame_t PROPERTY(icon_index);
 		GFX::frame_t PROPERTY(icon_count);
 
+		godot::Ref<godot::Image> sprite_image;
+
+		static godot::StringName const& _signal_image_updated();
+
 	protected:
 		static void _bind_methods();
 
 	public:
 		GFXIconTexture();
 
+		/* Create a GFXIconTexture using the specified GFX::TextureSprite and icon index. Returns nullptr if
+		 * set_gfx_texture_sprite fails. Connects the provided GFXButtonStateTextures (if any) to the
+		* GFXIconTexture's image_updated signal. */
 		static godot::Ref<GFXIconTexture> make_gfx_icon_texture(
-			GFX::TextureSprite const* gfx_texture_sprite, GFX::frame_t icon = GFX::NO_FRAMES
+			GFX::TextureSprite const* gfx_texture_sprite, GFX::frame_t icon = GFX::NO_FRAMES,
+			std::vector<godot::Ref<GFXButtonStateTexture>> const& button_state_textures = {}
 		);
 
 		/* Discard the GFX::TextureSprite, atlas texture and icon index. */

extension/src/openvic-extension/classes/GFXMaskedFlagTexture.cpp

@@ -13,15 +13,22 @@ using OpenVic::Utilities::godot_to_std_string;
 using OpenVic::Utilities::std_view_to_godot_string;
 using OpenVic::Utilities::std_view_to_godot_string_name;
 
+StringName const& GFXMaskedFlagTexture::_signal_image_updated() {
+	static const StringName signal_image_updated = "image_updated";
+	return signal_image_updated;
+}
+
 Error GFXMaskedFlagTexture::_generate_combined_image() {
 	ERR_FAIL_NULL_V(overlay_image, FAILED);
-	bool can_update = true;
-	if (combined_image.is_null() || combined_image->get_size() != overlay_image->get_size()) {
+	/* Whether we've already set the ImageTexture to an image of the right dimensions and format,
+	 * and so can update it without creating and setting a new image, or not. */
+	const bool can_update = combined_image.is_valid() && combined_image->get_size() == overlay_image->get_size()
+		&& combined_image->get_format() == overlay_image->get_format();
+	if (!can_update) {
 		combined_image = Image::create(
 			overlay_image->get_width(), overlay_image->get_height(), false, overlay_image->get_format()
 		);
 		ERR_FAIL_NULL_V(combined_image, FAILED);
-		can_update = false;
 	}
 
 	if (mask_image.is_valid() && flag_image.is_valid()) {
@@ -55,6 +62,7 @@ Error GFXMaskedFlagTexture::_generate_combined_image() {
 	} else {
 		set_image(combined_image);
 	}
+	emit_signal(_signal_image_updated(), combined_image);
 	return OK;
 }
 
@@ -68,14 +76,29 @@ void GFXMaskedFlagTexture::_bind_methods() {
 	OV_BIND_METHOD(GFXMaskedFlagTexture::set_flag_country_name, { "new_flag_country_name" });
 	OV_BIND_METHOD(GFXMaskedFlagTexture::get_flag_country_name);
 	OV_BIND_METHOD(GFXMaskedFlagTexture::get_flag_type);
+
+	ADD_SIGNAL(
+		MethodInfo(_signal_image_updated(), PropertyInfo(Variant::OBJECT, "source_image", PROPERTY_HINT_RESOURCE_TYPE, "Image"))
+	);
 }
 
 GFXMaskedFlagTexture::GFXMaskedFlagTexture() : gfx_masked_flag { nullptr }, flag_country { nullptr } {}
 
-Ref<GFXMaskedFlagTexture> GFXMaskedFlagTexture::make_gfx_masked_flag_texture(GFX::MaskedFlag const* gfx_masked_flag) {
+Ref<GFXMaskedFlagTexture> GFXMaskedFlagTexture::make_gfx_masked_flag_texture(
+	GFX::MaskedFlag const* gfx_masked_flag, std::vector<Ref<GFXButtonStateTexture>> const& button_state_textures
+) {
 	Ref<GFXMaskedFlagTexture> masked_flag_texture;
 	masked_flag_texture.instantiate();
 	ERR_FAIL_NULL_V(masked_flag_texture, nullptr);
+
+	for (Ref<GFXButtonStateTexture> const& button_state_texture : button_state_textures) {
+		masked_flag_texture->connect(
+			_signal_image_updated(),
+			Callable { *button_state_texture, GFXButtonStateTexture::get_generate_state_image_func_name() },
+			CONNECT_PERSIST
+		);
+	}
+
 	ERR_FAIL_COND_V(masked_flag_texture->set_gfx_masked_flag(gfx_masked_flag) != OK, nullptr);
 	return masked_flag_texture;
 }

extension/src/openvic-extension/classes/GFXMaskedFlagTexture.hpp

@@ -5,6 +5,8 @@
 #include <openvic-simulation/country/Country.hpp>
 #include <openvic-simulation/interface/GFX.hpp>
 
+#include "openvic-extension/classes/GFXButtonStateTexture.hpp"
+
 namespace OpenVic {
 	class GFXMaskedFlagTexture : public godot::ImageTexture {
 		GDCLASS(GFXMaskedFlagTexture, godot::ImageTexture)
@@ -15,6 +17,8 @@ namespace OpenVic {
 
 		godot::Ref<godot::Image> overlay_image, mask_image, flag_image, combined_image;
 
+		static godot::StringName const& _signal_image_updated();
+
 		godot::Error _generate_combined_image();
 
 	protected:
@@ -23,9 +27,12 @@ namespace OpenVic {
 	public:
 		GFXMaskedFlagTexture();
 
-		/* Create a GFXMaskedFlagTexture using the specific GFX::MaskedFlag.
-		 * Returns nullptr if setting gfx_masked_flag fails. */
-		static godot::Ref<GFXMaskedFlagTexture> make_gfx_masked_flag_texture(GFX::MaskedFlag const* gfx_masked_flag);
+		/* Create a GFXMaskedFlagTexture using the specified GFX::MaskedFlag. Returns nullptr if gfx_masked_flag fails.
+		 * Connects the provided GFXButtonStateTextures (if any) to the GFXMaskedFlagTexture's image_updated signal. */
+		static godot::Ref<GFXMaskedFlagTexture> make_gfx_masked_flag_texture(
+			GFX::MaskedFlag const* gfx_masked_flag,
+			std::vector<godot::Ref<GFXButtonStateTexture>> const& button_state_textures = {}
+		);
 
 		/* Reset gfx_masked_flag, flag_country and flag_type to nullptr/an empty string, and unreference all images.
 		 * This does not affect the godot::ImageTexture, which cannot be reset to a null or empty image. */