adding text management in engine

ScopEngine/Runtime/Sources/Graphics/Font.cpp

@@ -0,0 +1,65 @@
+#include <Graphics/Font.h>
+#include <Core/Logs.h>
+
+#include <fstream>
+
+#define STBRP_ASSERT(x) Scop::Assert(x, "internal stb assertion " #x)
+#define STB_RECT_PACK_IMPLEMENTATION
+#include <stb_rect_pack.h>
+
+#define STB_TRUETYPE_IMPLEMENTATION
+#include <stb_truetype.h>
+
+namespace Scop
+{
+	void Font::BuildFont()
+	{
+		std::vector<std::uint8_t> file_bytes;
+		if(std::holds_alternative<std::filesystem::path>(m_build_data))
+		{
+			std::ifstream file(std::get<std::filesystem::path>(m_build_data), std::ios::binary);
+			if(!file.is_open())
+			{
+				Error("Font: cannot open font file, %", m_name);
+				return;
+			}
+			std::ifstream::pos_type file_size = std::filesystem::file_size(std::get<std::filesystem::path>(m_build_data));
+			file.seekg(0, std::ios::beg);
+			file_bytes.resize(file_size);
+			file.read(reinterpret_cast<char*>(file_bytes.data()), file_size);
+			file.close();
+		}
+
+		CPUBuffer bitmap(RANGE * RANGE);
+
+		stbtt_pack_context pc;
+		stbtt_PackBegin(&pc, bitmap.GetData(), RANGE, RANGE, RANGE, 1, nullptr);
+		if(std::holds_alternative<std::filesystem::path>(m_build_data))
+			stbtt_PackFontRange(&pc, file_bytes.data(), 0, m_scale, 32, 96, m_cdata.data());
+		else
+			stbtt_PackFontRange(&pc, std::get<std::vector<std::uint8_t>>(m_build_data).data(), 0, m_scale, 32, 96, m_cdata.data());
+		stbtt_PackEnd(&pc);
+
+		// TODO : find better solution; No, using VK_FORMAT_R8_SRGB does not work
+		CPUBuffer vulkan_bitmap(RANGE * RANGE * 4);
+		for(int i = 0, j = 0; i < RANGE * RANGE; i++, j += 4)
+		{
+			vulkan_bitmap.GetData()[j + 0] = bitmap.GetData()[i];
+			vulkan_bitmap.GetData()[j + 1] = bitmap.GetData()[i];
+			vulkan_bitmap.GetData()[j + 2] = bitmap.GetData()[i];
+			vulkan_bitmap.GetData()[j + 3] = bitmap.GetData()[i];
+		}
+
+		m_atlas.Init(std::move(vulkan_bitmap), RANGE, RANGE, VK_FORMAT_R8G8B8A8_SRGB, false, m_name + "_font_atlas_" + std::to_string(m_scale));
+
+		Message("Font: loaded % with a scale of %", m_name, m_scale);
+	}
+
+	void Font::Destroy()
+	{
+		if(!m_atlas.IsInit())
+			return;
+		m_atlas.Destroy();
+		Message("Font: unloaded % with a scale of %", m_name, m_scale);
+	}
+}