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

---
 ui/iconButton.cpp | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 ui/iconButton.cpp

(limited to 'ui/iconButton.cpp')

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;
+}
-- 
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