From e806d41c8703ddc4bcaf2186d0c1701bd1e1ada3 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Wed, 22 Dec 2021 12:16:38 +0000
Subject: Initial commit with some basic UI

---
 application/main.cpp          |   1 -
 res/ui/icon/network.png       | Bin 0 -> 16793 bytes
 ui/gameMainWindow.cpp         |  25 ++++++++++++++----
 ui/icon.cpp                   |  33 +++++++++++++++++++++++
 ui/icon.h                     |  28 ++++++++++++++++++++
 ui/iconButton.cpp             |  59 ++++++++++++++++++++++++++++++++++++++++++
 ui/iconButton.h               |  27 +++++++++++++++++++
 ui/inputHandler.h             |  18 -------------
 ui/manualCameraController.cpp |   7 ++++-
 ui/manualCameraController.h   |  10 ++++---
 ui/toolbar.cpp                |  33 +++++++++++++++++++++++
 ui/toolbar.h                  |  26 +++++++++++++++++++
 ui/uiComponent.cpp            |  27 +++++++++++++++++++
 ui/uiComponent.h              |  24 ++++++++++++++++-
 ui/uiComponentPlacer.cpp      |  26 +++++++++++++++++++
 ui/uiComponentPlacer.h        |  22 ++++++++++++++++
 ui/window.cpp                 |  21 +++++++++++----
 ui/window.h                   |   8 +++---
 18 files changed, 356 insertions(+), 39 deletions(-)
 create mode 100644 res/ui/icon/network.png
 create mode 100644 ui/icon.cpp
 create mode 100644 ui/icon.h
 create mode 100644 ui/iconButton.cpp
 create mode 100644 ui/iconButton.h
 delete mode 100644 ui/inputHandler.h
 create mode 100644 ui/toolbar.cpp
 create mode 100644 ui/toolbar.h
 create mode 100644 ui/uiComponent.cpp
 create mode 100644 ui/uiComponentPlacer.cpp
 create mode 100644 ui/uiComponentPlacer.h

diff --git a/application/main.cpp b/application/main.cpp
index 68bc191..2053385 100644
--- a/application/main.cpp
+++ b/application/main.cpp
@@ -21,7 +21,6 @@
 #include <memory>
 #include <special_members.hpp>
 #include <ui/gameMainWindow.h>
-#include <ui/inputHandler.h>
 #include <ui/window.h>
 #include <vector>
 
diff --git a/res/ui/icon/network.png b/res/ui/icon/network.png
new file mode 100644
index 0000000..7a091f3
Binary files /dev/null and b/res/ui/icon/network.png differ
diff --git a/ui/gameMainWindow.cpp b/ui/gameMainWindow.cpp
index cd9d3e4..e1d9763 100644
--- a/ui/gameMainWindow.cpp
+++ b/ui/gameMainWindow.cpp
@@ -1,21 +1,36 @@
 #include "gameMainWindow.h"
-#include "collection.hpp"
 #include "gfx/camera_controller.h"
 #include "manualCameraController.h"
-#include "ui/window.h"
+#include "maths.h"
+#include "toolbar.h"
+#include "window.h"
 #include <GL/glew.h>
 #include <SDL2/SDL.h>
+#include <collection.hpp>
 #include <game/gamestate.h>
 #include <game/worldobject.h> // IWYU pragma: keep
 #include <gfx/renderable.h>
 #include <glm/glm.hpp>
-#include <maths.h>
 #include <memory>
 
+class GameMainToolbar : public Toolbar {
+public:
+	GameMainToolbar() :
+		Toolbar {
+				{"ui/icon/network.png",
+						[](const SDL_Event &) {
+							// fprintf(stderr, "network click\n");
+						}},
+		}
+	{
+	}
+};
+
 GameMainWindow::GameMainWindow(size_t w, size_t h) :
 	Window {w, h, "I Like Trains"}, camera {{-1250.0F, -1250.0F, 35.0F}, 70.0F, rdiv(w, h), 0.1F, 10000.0F}
 {
-	inputStack.create<ManualCameraController>(glm::vec2 {-1150, -1150});
+	uiComponents.create<GameMainToolbar>();
+	uiComponents.create<ManualCameraController>(glm::vec2 {-1150, -1150});
 
 	shader.setUniform("lightDirection", glm::normalize(glm::vec3 {1, 0, -1}));
 	shader.setUniform("lightColor", {.6, .6, .6});
@@ -25,7 +40,7 @@ GameMainWindow::GameMainWindow(size_t w, size_t h) :
 void
 GameMainWindow::tick(TickDuration)
 {
-	inputStack.apply<CameraController>(&CameraController::updateCamera, &camera);
+	uiComponents.apply<CameraController>(&CameraController::updateCamera, &camera);
 	shader.setView(camera.GetViewProjection());
 }
 
diff --git a/ui/icon.cpp b/ui/icon.cpp
new file mode 100644
index 0000000..371410a
--- /dev/null
+++ b/ui/icon.cpp
@@ -0,0 +1,33 @@
+#include "icon.h"
+#include <gfx/image.h>
+#include <resource.h>
+#include <stb/stb_image.h>
+
+Icon::Icon(const std::filesystem::path & fileName) : Icon {Image {Resource::mapPath(fileName).c_str(), STBI_rgb_alpha}}
+{
+}
+
+Icon::Icon(const Image & tex) : size {tex.width, tex.height}, m_texture {}
+{
+	glGenTextures(1, &m_texture);
+	glBindTexture(GL_TEXTURE_2D, m_texture);
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, static_cast<GLsizei>(tex.width), static_cast<GLsizei>(tex.height), 0,
+			GL_RGBA, GL_UNSIGNED_BYTE, tex.data.data());
+}
+
+Icon::~Icon()
+{
+	glDeleteTextures(1, &m_texture);
+}
+
+void
+Icon::Bind() const
+{
+	glBindTexture(GL_TEXTURE_2D, m_texture);
+}
diff --git a/ui/icon.h b/ui/icon.h
new file mode 100644
index 0000000..cc6df87
--- /dev/null
+++ b/ui/icon.h
@@ -0,0 +1,28 @@
+#ifndef ICON_H
+#define ICON_H
+
+#include <GL/glew.h>
+#include <filesystem>
+#include <glm/glm.hpp>
+#include <special_members.hpp>
+
+class Image;
+
+class Icon {
+public:
+	explicit Icon(const std::filesystem::path & fileName);
+	explicit Icon(const Image & image);
+
+	virtual ~Icon();
+
+	NO_COPY(Icon);
+	NO_MOVE(Icon);
+
+	void Bind() const;
+	const glm::vec2 size;
+
+private:
+	GLuint m_texture;
+};
+
+#endif
diff --git a/ui/iconButton.cpp b/ui/iconButton.cpp
new file mode 100644
index 0000000..c35303f
--- /dev/null
+++ b/ui/iconButton.cpp
@@ -0,0 +1,59 @@
+#include "iconButton.h"
+#include "ui/icon.h"
+#include "ui/uiComponent.h"
+#include <SDL2/SDL.h>
+#include <array>
+#include <filesystem>
+#include <functional>
+#include <glm/gtc/type_ptr.hpp>
+#include <utility>
+
+IconButton::IconButton(const std::string & icon_, glm::vec2 position_, UIEvent click_) :
+	UIComponent {{position_, ICON_SIZE}}, icon {icon_}, click {std::move(click_)}, m_vertexArrayObject {},
+	m_vertexArrayBuffer {}
+{
+	glGenVertexArrays(1, &m_vertexArrayObject);
+	glBindVertexArray(m_vertexArrayObject);
+
+	glGenBuffers(1, &m_vertexArrayBuffer);
+
+	glBindBuffer(GL_ARRAY_BUFFER, m_vertexArrayBuffer);
+	glBufferData(GL_ARRAY_BUFFER, static_cast<GLsizeiptr>(sizeof(glm::vec4) * 4), nullptr, GL_DYNAMIC_DRAW);
+
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, sizeof(glm::vec4), nullptr);
+
+	glBindVertexArray(0);
+}
+
+void
+IconButton::render(const UIShader &, const Position & parentPos) const
+{
+	icon.Bind();
+	glBindVertexArray(m_vertexArrayObject);
+	glBindBuffer(GL_ARRAY_BUFFER, m_vertexArrayBuffer);
+	const auto abs = parentPos.origin + position.origin;
+	const auto limit = abs + ICON_SIZE;
+	std::array<glm::vec4, 4> vertices {{
+			{abs.x, abs.y, 0, 0},
+			{limit.x, abs.y, 1, 0},
+			{limit.x, limit.y, 1, 1},
+			{abs.x, limit.y, 0, 1},
+	}};
+	glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), glm::value_ptr(vertices.front()));
+	glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+}
+
+bool
+IconButton::handleInput(const SDL_Event & e, const Position & parentPos)
+{
+	const auto absPos = position + parentPos;
+	if (absPos & e.button) {
+		if (e.button.type == SDL_MOUSEBUTTONUP && e.button.button == SDL_BUTTON_LEFT) {
+			click(e);
+		}
+	}
+	return false;
+}
diff --git a/ui/iconButton.h b/ui/iconButton.h
new file mode 100644
index 0000000..ec3f357
--- /dev/null
+++ b/ui/iconButton.h
@@ -0,0 +1,27 @@
+#ifndef ICONBUTTON_H
+#define ICONBUTTON_H
+
+#include "icon.h"
+#include "uiComponent.h"
+#include <GL/glew.h>
+#include <glm/glm.hpp>
+#include <string>
+
+class UIShader;
+union SDL_Event;
+
+static const constexpr glm::vec2 ICON_SIZE {32.F, 32.F};
+class IconButton : public UIComponent {
+public:
+	IconButton(const std::string & icon, glm::vec2 position, UIEvent click);
+
+	void render(const UIShader &, const Position & parentPos) const override;
+
+	bool handleInput(const SDL_Event & e, const Position & parentPos) override;
+
+	Icon icon;
+	UIEvent click;
+	GLuint m_vertexArrayObject, m_vertexArrayBuffer;
+};
+
+#endif
diff --git a/ui/inputHandler.h b/ui/inputHandler.h
deleted file mode 100644
index aac323b..0000000
--- a/ui/inputHandler.h
+++ /dev/null
@@ -1,18 +0,0 @@
-#ifndef INPUT_HANDLER_H
-#define INPUT_HANDLER_H
-
-#include <special_members.hpp>
-
-union SDL_Event;
-
-class InputHandler {
-public:
-	InputHandler() = default;
-	virtual ~InputHandler() = default;
-
-	DEFAULT_MOVE_COPY(InputHandler);
-
-	virtual bool handleInput(const SDL_Event &) = 0;
-};
-
-#endif
diff --git a/ui/manualCameraController.cpp b/ui/manualCameraController.cpp
index 1d3a067..568c547 100644
--- a/ui/manualCameraController.cpp
+++ b/ui/manualCameraController.cpp
@@ -5,7 +5,7 @@
 #include <maths.h>
 
 bool
-ManualCameraController::handleInput(const SDL_Event & e)
+ManualCameraController::handleInput(const SDL_Event & e, const Position &)
 {
 	switch (e.type) {
 		case SDL_KEYDOWN:
@@ -58,6 +58,11 @@ ManualCameraController::handleInput(const SDL_Event & e)
 	return false;
 }
 
+void
+ManualCameraController::render(const UIShader &, const Position &) const
+{
+}
+
 void
 ManualCameraController::updateCamera(Camera * camera) const
 {
diff --git a/ui/manualCameraController.h b/ui/manualCameraController.h
index ceff9ac..5ed45f5 100644
--- a/ui/manualCameraController.h
+++ b/ui/manualCameraController.h
@@ -1,19 +1,21 @@
 #ifndef MANUAL_CAMERA_CONTROLLER_H
 #define MANUAL_CAMERA_CONTROLLER_H
 
-#include "inputHandler.h"
+#include "uiComponent.h"
 #include <SDL2/SDL.h>
 #include <gfx/camera_controller.h>
 #include <glm/glm.hpp>
 #include <maths.h>
 
+class UIShader;
 class Camera;
 
-class ManualCameraController : public CameraController, public InputHandler {
+class ManualCameraController : public CameraController, public UIComponent {
 public:
-	explicit ManualCameraController(glm::vec2 f) : focus {f} { }
+	explicit ManualCameraController(glm::vec2 f) : UIComponent {{}}, focus {f} { }
 
-	bool handleInput(const SDL_Event & e) override;
+	bool handleInput(const SDL_Event & e, const Position &) override;
+	void render(const UIShader &, const Position & parentPos) const override;
 
 	void updateCamera(Camera * camera) const override;
 
diff --git a/ui/toolbar.cpp b/ui/toolbar.cpp
new file mode 100644
index 0000000..c8febce
--- /dev/null
+++ b/ui/toolbar.cpp
@@ -0,0 +1,33 @@
+#include "toolbar.h"
+#include "ui/iconButton.h"
+#include "ui/uiComponent.h"
+#include "uiComponentPlacer.h"
+#include <SDL2/SDL.h>
+#include <glm/glm.hpp>
+
+Toolbar::Toolbar(const std::initializer_list<InitInfo> & initInfo) : UIComponent {{{}, {}}}
+{
+	UIComponentPlacer placer {{10, 10}, 5, 1};
+	for (const auto & ii : initInfo) {
+		icons.create(ii.first, placer.next(ICON_SIZE), ii.second);
+	}
+	this->position.size = placer.getLimit();
+}
+
+void
+Toolbar::render(const UIShader & uiShader, const Position & parentPos) const
+{
+	const auto absPos = this->position + parentPos;
+	icons.apply(&UIComponent::render, uiShader, absPos);
+}
+
+bool
+Toolbar::handleInput(const SDL_Event & e, const Position & parentPos)
+{
+	const auto absPos = this->position + parentPos;
+	if (absPos & e.button) {
+		icons.applyOne(&UIComponent::handleInput, e, absPos);
+		return true;
+	}
+	return false;
+}
diff --git a/ui/toolbar.h b/ui/toolbar.h
new file mode 100644
index 0000000..28aba6c
--- /dev/null
+++ b/ui/toolbar.h
@@ -0,0 +1,26 @@
+#ifndef TOOLBAR_H
+#define TOOLBAR_H
+
+#include "collection.hpp"
+#include "iconButton.h"
+#include "uiComponent.h"
+#include <initializer_list>
+#include <string>
+#include <utility>
+
+class UIShader;
+union SDL_Event;
+
+class Toolbar : public UIComponent {
+public:
+	using InitInfo = std::pair<std::string, UIEvent>;
+	explicit Toolbar(const std::initializer_list<InitInfo> & initInfo);
+
+	void render(const UIShader & uiShader, const Position & parentPos) const override;
+
+	bool handleInput(const SDL_Event & e, const Position & parentPos) override;
+
+	Collection<IconButton, false> icons;
+};
+
+#endif
diff --git a/ui/uiComponent.cpp b/ui/uiComponent.cpp
new file mode 100644
index 0000000..ef62db9
--- /dev/null
+++ b/ui/uiComponent.cpp
@@ -0,0 +1,27 @@
+#include "uiComponent.h"
+#include <SDL2/SDL.h>
+
+UIComponent::UIComponent(Position position) : position {position} { }
+
+UIComponent::Position
+UIComponent::Position::operator+(const Position & parentPos) const
+{
+	return *this + parentPos.origin;
+}
+
+UIComponent::Position
+UIComponent::Position::operator+(const glm::vec2 & parentPos) const
+{
+	return {origin + parentPos, size};
+}
+
+bool
+UIComponent::Position::operator&(const glm::vec2 & pos) const
+{
+	return (pos.x >= origin.x && pos.y >= origin.y && pos.x < origin.x + size.x && pos.y < origin.y + size.y);
+}
+bool
+UIComponent::Position::operator&(const SDL_MouseButtonEvent & pos) const
+{
+	return *this & glm::vec2 {pos.x, pos.y};
+}
diff --git a/ui/uiComponent.h b/ui/uiComponent.h
index cd21de3..e7b3a0b 100644
--- a/ui/uiComponent.h
+++ b/ui/uiComponent.h
@@ -1,12 +1,34 @@
 #ifndef UICOMPONENT_H
 #define UICOMPONENT_H
 
+#include <functional>
+#include <glm/glm.hpp>
+#include <special_members.hpp>
+
 class UIShader;
+union SDL_Event;
+struct SDL_MouseButtonEvent;
+using UIEvent = std::function<void(const SDL_Event &)>;
 
 class UIComponent {
 public:
+	struct Position {
+		glm::vec2 origin, size;
+		Position operator+(const Position &) const;
+		Position operator+(const glm::vec2 &) const;
+		bool operator&(const SDL_MouseButtonEvent &) const;
+		bool operator&(const glm::vec2 &) const;
+	};
+	explicit UIComponent(Position);
 	virtual ~UIComponent() = default;
-	virtual void render(const UIShader &) const = 0;
+
+	NO_MOVE(UIComponent);
+	NO_COPY(UIComponent);
+
+	virtual void render(const UIShader &, const Position & parentPos) const = 0;
+	virtual bool handleInput(const SDL_Event &, const Position & parentPos) = 0;
+
+	Position position;
 };
 
 #endif
diff --git a/ui/uiComponentPlacer.cpp b/ui/uiComponentPlacer.cpp
new file mode 100644
index 0000000..368e772
--- /dev/null
+++ b/ui/uiComponentPlacer.cpp
@@ -0,0 +1,26 @@
+#include "uiComponentPlacer.h"
+#include <algorithm>
+
+UIComponentPlacer::UIComponentPlacer(glm::vec2 padding, float spacing, glm::length_t axis) :
+	padding {padding}, spacing {spacing}, axis {axis}, current {padding[axis]}
+{
+}
+
+glm::vec2
+UIComponentPlacer::next(glm::vec2 size)
+{
+	glm::vec2 n {};
+	n[axis] = current;
+	n[1 - axis] = padding[1 - axis];
+	current += spacing + size[axis];
+	max = std::max(max, size[1 - axis]);
+	return n;
+}
+glm::vec2
+UIComponentPlacer::getLimit() const
+{
+	glm::vec2 n {};
+	n[axis] = current + padding[axis];
+	n[1 - axis] = max + padding[1 - axis];
+	return n;
+}
diff --git a/ui/uiComponentPlacer.h b/ui/uiComponentPlacer.h
new file mode 100644
index 0000000..b68c4d8
--- /dev/null
+++ b/ui/uiComponentPlacer.h
@@ -0,0 +1,22 @@
+#ifndef UICOMPONENTPLACER_H
+#define UICOMPONENTPLACER_H
+
+#include <glm/glm.hpp>
+
+class UIComponentPlacer {
+public:
+	UIComponentPlacer(glm::vec2 padding, float spacing, glm::length_t axis = 0);
+
+	glm::vec2 next(glm::vec2 size);
+	glm::vec2 getLimit() const;
+
+private:
+	const glm::vec2 padding;
+	const float spacing;
+	const glm::length_t axis;
+
+	float current {};
+	float max {};
+};
+
+#endif
diff --git a/ui/window.cpp b/ui/window.cpp
index cd4a202..13c7d95 100644
--- a/ui/window.cpp
+++ b/ui/window.cpp
@@ -1,9 +1,10 @@
 #include "window.h"
-#include "inputHandler.h"
 #include "uiComponent.h"
 #include <GL/glew.h>
-#include <optional>
+#include <glm/glm.hpp>
 #include <stdexcept>
+#include <tuple>
+#include <type_traits>
 
 static SDL_GLContext
 SDL_GL_CreateContextAndGlewInit(SDL_Window * w)
@@ -27,7 +28,7 @@ Window::Window(size_t width, size_t height, const std::string & title) :
 			static_cast<int>(width), static_cast<int>(height), static_cast<Uint32>(SDL_WINDOW_OPENGL)},
 	uiShader {[this](auto w) {
 				  // must call glContent before creating the shader
-				  glContext();
+				  std::ignore = glContext();
 				  return w;
 			  }(width),
 			height}
@@ -51,7 +52,17 @@ bool
 Window::handleInput(const SDL_Event & e)
 {
 	if (SDL_GetWindowID(m_window) == e.window.windowID) {
-		inputStack.applyOne(&InputHandler::handleInput, e);
+		SDL_Event eAdjusted {e};
+		glm::ivec2 size {};
+		switch (e.type) {
+			// SDL and OpenGL have coordinates that are vertically opposed.
+			case SDL_MOUSEBUTTONDOWN:
+			case SDL_MOUSEBUTTONUP:
+				SDL_GetWindowSize(m_window, &size.x, &size.y);
+				eAdjusted.button.y = size.y - e.button.y;
+				break;
+		}
+		uiComponents.applyOne(&UIComponent::handleInput, eAdjusted, UIComponent::Position {{}, size});
 		return true;
 	}
 	return false;
@@ -80,5 +91,5 @@ Window::render(const GameState *) const
 {
 	uiShader.use();
 	glDisable(GL_DEPTH_TEST);
-	inputStack.apply<UIComponent>(&UIComponent::render, uiShader);
+	uiComponents.apply(&UIComponent::render, uiShader, UIComponent::Position {});
 }
diff --git a/ui/window.h b/ui/window.h
index 9c6d023..25443bd 100644
--- a/ui/window.h
+++ b/ui/window.h
@@ -4,12 +4,12 @@
 #include "chronology.hpp"
 #include "collection.hpp"
 #include "gfx/gl/uiShader.h"
-#include "inputHandler.h" // IWYU pragma: keep
 #include "ptr.hpp"
+#include "uiComponent.h" // IWYU pragma: keep
 #include <SDL2/SDL.h>
+#include <cstddef>
 #include <special_members.hpp>
 #include <string>
-#include <type_traits>
 
 class GameState;
 
@@ -29,12 +29,12 @@ public:
 	void swapBuffers() const;
 
 protected:
-	SDL_GLContext glContext() const;
+	[[nodiscard]] SDL_GLContext glContext() const;
 	virtual void render(const GameState *) const;
 
 	using SDL_WindowPtr = wrapped_ptrt<SDL_Window, SDL_CreateWindow, SDL_DestroyWindow>;
 	SDL_WindowPtr m_window;
-	Collection<InputHandler> inputStack;
+	Collection<UIComponent> uiComponents;
 	UIShader uiShader;
 };
 
-- 
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