Move screen run logic into apple run_loop and create

include/apple2.h

@@ -1,8 +1,9 @@
 #ifndef _APPLE2_H_
 #define _APPLE2_H_
 
-#include "mos6502.h"
 #include "apple2.dd.h"
+#include "mos6502.h"
+#include "vm_screen.h"
 
 typedef struct {
     /*
@@ -17,6 +18,11 @@ typedef struct {
      */
     vm_segment *memory;
 
+    /*
+     * The screen wherein we shall render all of our graphics.
+     */
+    vm_screen *screen;
+
     /*
      * Our two disk drives.
      */
@@ -24,11 +30,12 @@ typedef struct {
     apple2dd *drive2;
 } apple2;
 
-extern apple2 *apple2_create();
+extern apple2 *apple2_create(int, int);
 extern void apple2_free(apple2 *);
 extern void apple2_press_key(apple2 *, vm_8bit);
 extern void apple2_clear_strobe(apple2 *);
 extern void apple2_release_key(apple2 *);
 extern int apple2_boot(apple2 *);
+extern void apple2_run_loop(apple2 *);
 
 #endif

src/apple2.c

@@ -25,9 +25,10 @@
  * Create the basic apple2 structure.
  */
 apple2 *
-apple2_create()
+apple2_create(int width, int height)
 {
     apple2 *mach;
+    int err;
 
     mach = malloc(sizeof(apple2));
     if (mach == NULL) {
@@ -37,12 +38,39 @@ apple2_create()
     mach->cpu = mos6502_create();
     mach->memory = mach->cpu->memory;
 
+    // Our two drives -- we create both of them, even if we intend to
+    // use only one.
     mach->drive1 = apple2dd_create();
     mach->drive2 = apple2dd_create();
 
+    // Let's build our screen abstraction!
+    mach->screen = vm_screen_create();
+    if (mach->screen == NULL) {
+        log_critical("Screen creation failed!\n");
+        return NULL;
+    }
+
+    // We still need to add a window, since we want to render some
+    // graphics.
+    err = vm_screen_add_window(mach->screen, width, height);
+    if (err != OK) {
+        log_critical("Window creation failed!\n");
+        return NULL;
+    }
+
     return mach;
 }
 
+void
+apple2_run_loop(apple2 *mach)
+{
+    while (vm_screen_active(mach->screen)) {
+        vm_screen_set_color(mach->screen, 255, 0, 0, 255);
+        vm_screen_draw_rect(mach->screen, 50, 50, 20, 20);
+        vm_screen_refresh(mach->screen);
+    }
+}
+
 /*
  * Free the memory reserved for an apple2 struct.
  */

src/main.c

@@ -89,33 +89,24 @@ main(int argc, char **argv)
     // successfully or if we run `exit()` from elsewhere in the program.
     atexit(finish);
 
-    mach = apple2_create();
+    // Let's build the basic machine, using the width and height
-    err = apple2_boot(mach);
+    // indicated by the user.
+    mach = apple2_create(option_get_width(),
+                         option_get_height());
 
+    // Ok, it's time to boot this up!
+    err = apple2_boot(mach);
     if (err != OK) {
         fprintf(stderr, "Bootup failed!\n");
         exit(1);
     }
 
-    screen = vm_screen_create();
+    // This will run for as long as we want to hang out in the emulated
-    if (screen == NULL) {
+    // machine.
-        fprintf(stderr, "Screen creation failed!\n");
+    apple2_run_loop(mach);
-        exit(1);
-    }
 
-    err = vm_screen_add_window(screen, 
+    // We're all done, so let's tear everything down.
-                               option_get_width(), 
+    apple2_free(mach);
-                               option_get_height());
-    if (err != OK) {
-        fprintf(stderr, "Window creation failed!\n");
-        exit(1);
-    }
-
-    while (vm_screen_active(screen)) {
-        vm_screen_set_color(screen, 255, 0, 0, 255);
-        vm_screen_draw_rect(screen, 50, 50, 20, 20);
-        vm_screen_refresh(screen);
-    }
 
     // ha ha ha ha #nervous #laughter
     printf("Hello, world\n");