draw some test text in Window for now

src/gui/Window.cc

@@ -1,8 +1,10 @@
 #include "gl3w.h"
 #include "Window.h"
+#include "Runtime.h"
 
 #define INITIAL_WIDTH   500
 #define INITIAL_HEIGHT  500
+#define FONT_SIZE 16
 
 /**
  * Initialize SDL.
@@ -92,6 +94,23 @@ bool Window::create()
 
     m_exit_requested = false;
 
+    /* TODO: user configurable font, size */
+    std::string font_path = Runtime::find(Runtime::FONT, "DejaVuSansMono");
+    if (font_path == "")
+    {
+        return false;
+    }
+
+    if (!m_font.load(font_path.c_str(), FONT_SIZE))
+    {
+        return false;
+    }
+
+    m_programs.text = std::make_shared<TextProgram>();
+    m_programs.text->use();
+    m_programs.text->set_texture(0);
+    m_programs.text->set_color(1.0, 0.9, 0.8, 1.0);
+
     resize();
 
     return true;
@@ -149,10 +168,10 @@ void Window::handle_event(SDL_Event & event)
 
 void Window::resize()
 {
-    int width;
-    int height;
-    SDL_GetWindowSize(m_window, &width, &height);
-    glViewport(0, 0, width, height);
+    SDL_GetWindowSize(m_window, &m_width, &m_height);
+    glViewport(0, 0, m_width, m_height);
+    m_programs.text->use();
+    m_programs.text->set_viewport_size(m_width, m_height);
 }
 
 void Window::redraw()
@@ -160,5 +179,18 @@ void Window::redraw()
     glClearColor (0.0, 0.0, 0.0, 0.0);
     glClear(GL_COLOR_BUFFER_BIT);
 
+    m_programs.text->use();
+    static const char msg[] = "Welcome to " APPNAME " pre-pre-pre-alpha!!";
+    int advance = m_font.get_advance();
+    int x = 0;
+    int y = m_height - FONT_SIZE;
+    for (int i = 0, len = strlen(msg); i < len; i++)
+    {
+        m_programs.text->set_position(x, y);
+        auto g = m_font.get_glyph(msg[i]);
+        g->render();
+        x += advance;
+    }
+
     SDL_GL_SwapWindow(m_window);
 }

src/gui/Window.h

@@ -2,6 +2,8 @@
 #define WINDOW_H
 
 #include <SDL.h>
+#include "TextProgram.h"
+#include "Font.h"
 
 class Window
 {
@@ -16,6 +18,14 @@ protected:
 
     SDL_Window * m_window;
     bool m_exit_requested;
+    int m_width;
+    int m_height;
+    struct
+    {
+        std::shared_ptr<TextProgram> text;
+    } m_programs;
+
+    Font m_font;
 };
 
 #endif