MacroLibX/runtime/Sources/Graphics/Text.cpp

#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;
	}
}