From 1f68fe78e84f25c8ddacdc37a293a5de31725bab Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 1 Jan 2022 13:01:08 +0000
Subject: First iteration with font/text support

---
 ui/font.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 ui/font.h

(limited to 'ui/font.h')

diff --git a/ui/font.h b/ui/font.h
new file mode 100644
index 0000000..c9d834a
--- /dev/null
+++ b/ui/font.h
@@ -0,0 +1,48 @@
+#ifndef FONT_H
+#define FONT_H
+
+#include <GL/glew.h>
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <glm/glm.hpp>
+#include <map>
+#include <string>
+#include <string_view>
+#include <vector>
+
+class Font {
+public:
+	Font(const char * const path, unsigned int height);
+
+	using Quad = std::array<glm::vec4, 4>;
+	using Quads = std::vector<Quad>;
+	using TextureQuads = std::map<GLuint /*textureId*/, Quads>;
+	TextureQuads render(const std::string_view text) const;
+
+	struct CharData {
+		size_t textureIdx;
+		glm::uvec2 size;
+		glm::uvec2 position;
+		glm::ivec2 bearing;
+		long advance;
+	};
+	struct FontTexture {
+		GLuint texture;
+		unsigned int used;
+	};
+
+	static glm::uvec3 getTextureSize(unsigned int height);
+
+protected:
+	void generateChars(const std::string_view text) const;
+	const CharData getChar(char) const;
+	std::size_t getTextureWithSpace(unsigned int adv) const;
+
+	std::string path;
+	glm::uvec3 size;
+	mutable std::map<uint32_t, CharData> charsData;
+	mutable std::vector<FontTexture> fontTextures;
+};
+
+#endif
-- 
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