Add option to control the window scale

Author: Rodrigodd

src/core.c

@@ -10,7 +10,11 @@ void free_block(gb_block *block)
     munmap(block->mem, block->size);
 }
 
-bool init_vm(gb_vm *vm, const char *filename, int opt_level, bool init_io)
+bool init_vm(gb_vm *vm,
+             const char *filename,
+             int opt_level,
+             int scale,
+             bool init_io)
 {
     if (!gb_memory_init(&vm->memory, filename))
         return false;
@@ -90,7 +94,7 @@ bool init_vm(gb_vm *vm, const char *filename, int opt_level, bool init_io)
 
     if (init_io) {
         /* both audio and lcd will be initialized if init_io is true*/
-        if (!init_window(&vm->lcd))
+        if (!init_window(&vm->lcd, scale))
             return false;
 
         vm->draw_frame = true;

src/core.h

@@ -31,8 +31,12 @@ typedef struct {
 
 void free_block(gb_block *block);
 
-bool init_vm(gb_vm *vm, const char *filename, int opt_level, bool init_io);
 bool run_vm(gb_vm *vm);
+bool init_vm(gb_vm *vm,
+             const char *filename,
+             int opt_level,
+             int scale,
+             bool init_io);
 bool free_vm(gb_vm *vm);
 
 #endif

src/lcd.c

@@ -181,11 +181,13 @@ static int render_thread_function(void *ptr)
     return 0;
 }
 
-bool init_window(gb_lcd *lcd)
+bool init_window(gb_lcd *lcd, int scale)
 {
     SDL_Init(SDL_INIT_VIDEO);
+    int width = 160 * scale;
+    int height = 144 * scale;
     lcd->win = SDL_CreateWindow("jitboy", SDL_WINDOWPOS_UNDEFINED,
-                                SDL_WINDOWPOS_UNDEFINED, 160 * 3, 144 * 3,
+                                SDL_WINDOWPOS_UNDEFINED, width, height,
                                 SDL_WINDOW_OPENGL);
     if (!lcd->win) {
         LOG_ERROR("Window could not be created! SDL_Error: %s\n",

src/lcd.h

@@ -13,7 +13,7 @@ typedef struct {
     bool fullscreen;
 } gb_lcd;
 
-bool init_window(gb_lcd *lcd);
+bool init_window(gb_lcd *lcd, int scale);
 void deinit_window(gb_lcd *lcd);
 void update_line(uint8_t *mem);
 void toggle_fullscreen(gb_lcd *lcd);

src/main.c

@@ -11,7 +11,8 @@ static void usage(const char *exe)
     printf(
         "Usage: %s [OPTIONS]\n"
         "Options:\n"
-        "  -O, --opt-level=LEVEL   Set the optimization level (default: 0)\n",
+        "  -O, --opt-level=LEVEL   Set the optimization level (default: 0)\n"
+        "  -s, --scale=SCALE       Set the scale of the window (default: 3)\n",
         exe);
 }
 
@@ -48,16 +49,21 @@ int main(int argc, char *argv[])
     }
 
     int opt_level = 0;
+    int scale = 3;
     int c;
     const struct option long_options[] = {
         {"opt-level", required_argument, NULL, 'O'},
+        {"scale", required_argument, NULL, 's'},
         {NULL, 0, NULL, 0}  // Terminating element
     };
-    while ((c = getopt_long(argc, argv, "O:", long_options, NULL)) != -1) {
+    while ((c = getopt_long(argc, argv, "O:s:", long_options, NULL)) != -1) {
         switch (c) {
         case 'O':
             sscanf(optarg, "%i", &opt_level);
             break;
+        case 's':
+            sscanf(optarg, "%i", &scale);
+            break;
         case '?':
         default:
             usage(argv[0]);
@@ -77,7 +83,7 @@ int main(int argc, char *argv[])
 
     /* initialize memory */
     gb_vm *vm = malloc(sizeof(gb_vm));
-    if (!init_vm(vm, argv[optind], opt_level, true)) {
+    if (!init_vm(vm, argv[optind], opt_level, scale, true)) {
         LOG_ERROR("Fail to initialize\n");
         exit(1);
     }

tests/instr_test.c

@@ -37,7 +37,7 @@ static void gbz80_init(size_t tester_instruction_mem_size,
     instruction_mem = tester_instruction_mem;
 
     vm = malloc(sizeof(gb_vm));
-    if (!init_vm(vm, NULL, 0, false)) {
+    if (!init_vm(vm, NULL, 0, 0, false)) {
         LOG_ERROR("Fail to initialize\n");
         exit(1);
     }