From bc48df9f7162a4a816fdc0edaa6ed08304008c9c Mon Sep 17 00:00:00 2001
From: gbc dev <gbc@localhost>
Date: Sat, 4 Jul 2026 22:11:10 +0200
Subject: core emulator: SM83 CPU, MMU, timer, PPU, CGB support

Passes blargg cpu_instrs (all 11), instr_timing, mem_timing.
---
 src/main.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 src/main.c

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..27e886a
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,41 @@
+#include "gb.h"
+#include "cpu.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char **argv) {
+    if (argc < 2) {
+        fprintf(stderr, "usage: %s <rom> [--test seconds]\n", argv[0]);
+        return 1;
+    }
+    const char *rom = argv[1];
+    bool test = false;
+    double seconds = 30.0;
+    for (int i = 2; i < argc; i++) {
+        if (!strcmp(argv[i], "--test")) {
+            test = true;
+            if (i + 1 < argc) seconds = atof(argv[++i]);
+        }
+    }
+
+    GB *gb = calloc(1, sizeof(GB));
+    if (cart_load(&gb->cart, rom) != 0) return 1;
+    gb_reset(gb);
+
+    if (test) {
+        gb->serial_log = true;
+        u64 target = (u64)(seconds * 4194304.0);
+        while (gb->cycles < target) cpu_step(gb);
+        fprintf(stderr, "\n[ran %llu cycles]\n", (unsigned long long)gb->cycles);
+        cart_free(&gb->cart);
+        free(gb);
+        return 0;
+    }
+
+    // TODO: interactive terminal rendering
+    fprintf(stderr, "interactive mode not yet implemented; use --test\n");
+    cart_free(&gb->cart);
+    free(gb);
+    return 0;
+}
-- 
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