Add Console class for reading stdout using GPU

include/cpp3ds/Graphics/Console.hpp

@@ -0,0 +1,77 @@
+#ifndef CPP3DS_CONSOLE_HPP
+#define CPP3DS_CONSOLE_HPP
+
+////////////////////////////////////////////////////////////
+// Headers
+////////////////////////////////////////////////////////////
+#include <cpp3ds/System/NonCopyable.hpp>
+#include <cpp3ds/Graphics/Drawable.hpp>
+#include <cpp3ds/Graphics/Font.hpp>
+#include <cpp3ds/Graphics/Text.hpp>
+
+namespace cpp3ds
+{
+
+extern std::vector<String> g_stdout;
+
+////////////////////////////////////////////////////////////
+/// \brief Class holding a valid drawing context
+///
+////////////////////////////////////////////////////////////
+class Console : public Drawable
+{
+public:
+
+	////////////////////////////////////////////////////////////
+	/// \brief Default constructor
+	///
+	/// The constructor creates and activates the context
+	///
+	////////////////////////////////////////////////////////////
+	Console();
+
+	////////////////////////////////////////////////////////////
+	/// \brief Destructor
+	///
+	/// The destructor deactivates and destroys the context
+	///
+	////////////////////////////////////////////////////////////
+	~Console();
+
+public:
+
+	void create();
+
+	void update(float delta);
+
+	void write(String text);
+
+	bool processEvent(Event& event);
+
+	void setVisible(bool visible);
+
+private:
+
+	////////////////////////////////////////////////////////////
+	/// \brief Draw the console to a render target
+	///
+	/// \param target Render target to draw to
+	/// \param states Current render states
+	///
+	////////////////////////////////////////////////////////////
+	virtual void draw(RenderTarget& target, RenderStates states) const;
+
+	////////////////////////////////////////////////////////////
+	// Member data
+	////////////////////////////////////////////////////////////
+	Font  m_font;
+	std::vector<Text> m_lines;
+	unsigned int m_limit;
+	bool m_initialized;
+	bool m_visible;
+};
+
+} // namespace cpp3ds
+
+
+#endif // CPP3DS_CONSOLE_HPP

src/cpp3ds/Graphics/Console.cpp

@@ -0,0 +1,134 @@
+////////////////////////////////////////////////////////////
+// Headers
+////////////////////////////////////////////////////////////
+#include <vector>
+#include <cpp3ds/Config.hpp>
+#include <cpp3ds/Window/Event.hpp>
+#include <cpp3ds/Graphics/Console.hpp>
+#include <cpp3ds/Window/GlContext.hpp>
+#include <cpp3ds/Graphics/RenderTarget.hpp>
+#include <cpp3ds/Resources.hpp>
+#include <stdio.h>
+#ifndef EMULATION
+#include <sys/iosupport.h>
+#endif
+
+namespace cpp3ds {
+	std::vector<String> g_stdout;
+}
+
+extern "C" {
+
+#ifndef EMULATION
+ssize_t console_write(struct _reent *r, int fd, const char *ptr, size_t len) {
+	cpp3ds::g_stdout.push_back(cpp3ds::String(ptr));
+	return len;
+}
+
+static const devoptab_t dotab_stdout = {
+	"con", 0, NULL, NULL, console_write, NULL, NULL, NULL
+};
+#endif
+
+}
+
+namespace cpp3ds
+{
+////////////////////////////////////////////////////////////
+Console::Console()
+{
+	//
+}
+
+
+////////////////////////////////////////////////////////////
+Console::~Console()
+{
+	if (m_initialized)
+	{
+		//
+	}
+}
+
+
+////////////////////////////////////////////////////////////
+void Console::create()
+{
+	if (!m_initialized) {
+		m_initialized = true;
+#ifndef EMULATION
+		devoptab_list[STD_OUT] = &dotab_stdout;
+		devoptab_list[STD_ERR] = &dotab_stdout;
+		setvbuf(stdout, NULL, _IONBF, 0);
+		setvbuf(stderr, NULL, _IONBF, 0);
+
+		priv::ResourceInfo font = priv::core_resources["sansation.ttf"];
+		m_font.loadFromMemory(font.data, font.size);
+#endif
+
+		m_limit = 1000;
+	}
+}
+
+
+////////////////////////////////////////////////////////////
+void Console::update(float delta)
+{
+	for (String& s : g_stdout)
+		write(s);
+	g_stdout.clear();
+
+	if (m_lines.size() > m_limit)
+		m_lines.erase(m_lines.begin(), m_lines.end() - m_limit);
+}
+
+
+////////////////////////////////////////////////////////////
+void Console::write(String text)
+{
+	Text line(text, m_font, 12);
+	m_lines.push_back(line);
+}
+
+
+////////////////////////////////////////////////////////////
+bool Console::processEvent(Event& event)
+{
+	if (event.type == Event::KeyPressed) {
+		if (event.key.code == Keyboard::A) {
+			m_visible = !m_visible;
+			return false;
+		}
+	}
+
+	// Allow event to also be processed by the game
+	return true;
+}
+
+
+////////////////////////////////////////////////////////////
+void Console::setVisible(bool visible)
+{
+	m_visible = visible;
+}
+
+
+////////////////////////////////////////////////////////////
+void Console::draw(RenderTarget& target, RenderStates states) const
+{
+	if (!m_visible)
+		return;
+
+	int h = 240;
+	int i = m_lines.size();
+
+	while (h > 0 && i > 0) {
+		Text text = m_lines[--i];
+		h -= text.getGlobalBounds().height;
+		text.setPosition(0, h);
+		target.draw(text);
+	}
+}
+
+
+} // namespace cpp3ds