Add window resizing handling

game/src/event/evtman.c

@@ -94,6 +94,7 @@ void
 evtman_init ()
 {
 #define KEY(k) GINT_TO_POINTER(k)
+  evtman_add_handler (2, SDL_EVENT_WINDOW_RESIZED, NULL, NULL, graphics_cb_window_resize, NULL);
   /* The UI effectively eats most SDL events, as it needs it for it's
      own calculations. */
   evtman_add_handler (1, SDL_EVENT_KEY_DOWN,          evt_pred_flag, "ui_has_focus", uiman_cb_key_down,     NULL);

game/src/event/evtman.h

@@ -7,6 +7,7 @@
 #include "handler.h"
 #include "../util.h"
 #include "../flags.h"
+#include "../graphics.h"
 #include "../ui/uiman.h"
 
 typedef struct CompositePredicate

game/src/graphics.c

@@ -8,13 +8,12 @@ int render_distance = 2;
 
 static SDL_GLContext gl_context;
 
+static int window_w = 800, window_h = 600;
+
 static uint64_t last_check_perf = 0;
 static int avg_counter = 0;
 static double avg_elapsed = 0;
 
-#define WINDOW_WIDTH 800
-#define WINDOW_HEIGHT 600
-
 void
 graphics_init ()
 {
@@ -23,7 +22,7 @@ graphics_init ()
       g_error ("Couldn't initialize SDL: %s", SDL_GetError ());
     }
 
-  sdl_window = SDL_CreateWindow (GAME_NAME, WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_OPENGL);
+  sdl_window = SDL_CreateWindow (GAME_NAME, window_w, window_h, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
 
   if (!sdl_window)
     {
@@ -53,7 +52,7 @@ graphics_init ()
   g_info ("GLSL version: %s", glGetString (GL_SHADING_LANGUAGE_VERSION));
   g_info ("Max vertex attributes: %d", GL_MAX_VERTEX_ATTRIBS);
   
-  glViewport (0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
+  glViewport (0, 0, window_w, window_h);
   glClearColor (0, 0.3, 0.8, 1);
   
   glEnable (GL_CULL_FACE);
@@ -71,7 +70,7 @@ graphics_render ()
   uint64_t freq = SDL_GetPerformanceFrequency ();
   
   mat4 projection, view;
-  camera_get_projection (WINDOW_WIDTH / WINDOW_HEIGHT, projection);
+  camera_get_projection ((float) window_w / (float) window_h, projection);
   camera_get_view (view);
 
   resources_programs_set_mat4 ("projection", &projection);
@@ -129,3 +128,12 @@ graphics_free ()
   SDL_GL_DestroyContext (gl_context);
   SDL_DestroyWindow (sdl_window);
 }
+
+gboolean
+graphics_cb_window_resize (SDL_Event *event, void *data)
+{
+  UNUSED (event, data);
+  SDL_GetWindowSize (sdl_window, &window_w, &window_h);
+  glViewport (0, 0, window_w, window_h);
+  return TRUE;
+}

game/src/graphics.h

@@ -24,3 +24,4 @@
 void graphics_init ();
 void graphics_render ();
 void graphics_free ();
+gboolean graphics_cb_window_resize ();