working on texts and fonts

runtime/Sources/Graphics/Text.cpp

@@ -0,0 +1,61 @@
+#include <PreCompiled.h>
+
+#include <Graphics/Text.h>
+
+#define STB_RECT_PACK_IMPLEMENTATION
+#include <stb_rect_pack.h>
+
+namespace mlx
+{
+	Text::Text(const std::string& text, std::shared_ptr<Font> font) : Drawable(DrawableType::Text)
+	{
+		MLX_PROFILE_FUNCTION();
+
+		Assert(font != nullptr, "invalid font");
+
+		std::vector<Vertex> vertex_data;
+		std::vector<std::uint32_t> index_data;
+
+		float stb_x = 0.0f;
+		float stb_y = 0.0f;
+
+		for(char c : text)
+		{
+			if(c < 32)
+				continue;
+
+			stbtt_aligned_quad q;
+			stbtt_GetPackedQuad(font->GetCharData().data(), RANGE, RANGE, c - 32, &stb_x, &stb_y, &q, 1);
+
+			std::size_t index = vertex_data.size();
+
+			vertex_data.emplace_back(Vec4f{ q.x0, q.y0, 0.0f, 0.0f }, Vec2f{ q.s0, q.t0 });
+			vertex_data.emplace_back(Vec4f{ q.x1, q.y0, 0.0f, 0.0f }, Vec2f{ q.s1, q.t0 });
+			vertex_data.emplace_back(Vec4f{ q.x1, q.y1, 0.0f, 0.0f }, Vec2f{ q.s1, q.t1 });
+			vertex_data.emplace_back(Vec4f{ q.x0, q.y1, 0.0f, 0.0f }, Vec2f{ q.s0, q.t1 });
+
+			index_data.emplace_back(index + 0);
+			index_data.emplace_back(index + 1);
+			index_data.emplace_back(index + 2);
+			index_data.emplace_back(index + 2);
+			index_data.emplace_back(index + 3);
+			index_data.emplace_back(index + 0);
+		}
+
+		std::shared_ptr<Mesh> mesh = std::make_shared<Mesh>();
+		mesh->AddSubMesh({ std::move(vertex_data), std::move(index_data) });
+		Init(text, font, mesh);
+	}
+
+	void Text::Init(const std::string& text, std::shared_ptr<Font> font, std::shared_ptr<Mesh> mesh)
+	{
+		MLX_PROFILE_FUNCTION();
+
+		Assert(font != nullptr, "invalid font");
+		Assert(mesh != nullptr, "invalid mesh");
+
+		p_mesh = mesh;
+		p_font = font;
+		m_text = text;
+	}
+}