From 00d5b228460b82cf7f2feee3925eb1c19627a788 Mon Sep 17 00:00:00 2001
From: jborza <jborza@gmail.com>
Date: Sat, 27 Apr 2019 20:49:07 +0200
Subject: [PATCH] Windows 6502 debugger / frontend similar to easy6502

---
 debugger_windows.c | 160 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100644 debugger_windows.c

diff --git a/debugger_windows.c b/debugger_windows.c
new file mode 100644
index 0000000..c26b526
--- /dev/null
+++ b/debugger_windows.c
@@ -0,0 +1,160 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <memory.h>
+#include "state.h"
+#include "cpu.h"
+#include "disassembler.h"
+#include "opcodes.h"
+#include <windows.h> 
+#include <conio.h>
+
+#define MEMORY_SIZE 0xFFFF
+#define PRG_START 0x0600
+#define BLOCK 0xDB
+
+int glob_file_size;
+int last_key;
+
+void con_set_color(unsigned int fg_color, unsigned int bg_color)
+{
+	HANDLE hStdOut;
+
+	hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
+
+	if (hStdOut == INVALID_HANDLE_VALUE) {
+		return;
+	}
+
+	SetConsoleTextAttribute(hStdOut, (bg_color << 4) | fg_color);
+}
+
+void con_set_xy(int x, int y)
+{
+	COORD coord;
+	coord.X = x;
+	coord.Y = y;
+	SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
+}
+
+void print_row(State6502 * state, int start_address) {
+	byte last_color = 0xff;
+	for (int address = start_address; address < start_address + 32; address++) {
+		if (state->memory[address] != last_color)
+		{
+			con_set_color(0x04, state->memory[address]);
+			last_color = state->memory[address];
+		}
+		_putch('*');
+		//		printf(" ");
+	}
+}
+
+void print_mem(State6502 * state) {
+	con_set_xy(1, 1);
+	for (int row = 0; row < 32; row++)
+	{
+		print_row(state, 0x0200 + row * 32);
+		con_set_xy(1, 1 + row);
+	}
+}
+
+void print_state_debug(State6502 * state) {
+	con_set_color(0x0F, 0x00); //white FG, black BG
+	con_set_xy(40, 0);
+	printf("A=$%02X X=$%02X Y=$%02X", state->a, state->x, state->y);
+	con_set_xy(40, 1);
+	printf("SP=$%02X PC=$%04X", state->sp, state->pc);
+	con_set_xy(40, 3);
+	printf("NV-BDIZC");
+	con_set_xy(40, 4);
+	printf("%d%d%d%d%d%d%d%d", state->flags.n, state->flags.v, state->flags.pad, state->flags.b, state->flags.d, state->flags.i, state->flags.z, state->flags.c);
+}
+
+void print_stack(State6502 * state) {
+	con_set_xy(40, 16);
+	for (int i = state->sp + 1; i <= 0xFF; i++)
+		printf("%02x ", state->memory[STACK_HOME + i]);
+}
+
+byte * read_bin() {
+	FILE* file = fopen("bins\\snake_fast.bin", "rb");
+	if (!file) {
+		int err = errno;
+		exit(1);
+	}
+	fseek(file, 0, SEEK_END);
+	glob_file_size = ftell(file);
+	rewind(file);
+
+	byte* buffer = malloc(glob_file_size);
+	int read = fread(buffer, sizeof(byte), glob_file_size, file);
+	fclose(file);
+	return buffer;
+}
+
+void check_keys() {
+	int keys[] = { 'W', 'S', 'A', 'D' };
+	for (int i = 0; i < sizeof(keys); i++)
+		if (GetAsyncKeyState(keys[i])) {
+			last_key = keys[i];
+		}
+}
+
+void print_frame() {
+	con_set_color(0x08, 0x00);
+	con_set_xy(0, 0);
+	_putch('/');
+	int y = 0;
+	for (int x = 1; x <= 32; x++) {
+		con_set_xy(x, y);
+		_putch('-');
+	}
+	_putch('\\');
+	y = 33;
+	for (int x = 0; x < 32; x++) {
+		con_set_xy(x, y);
+		_putch('-');
+	}
+	int x = 0;
+	for (int y = 1; y <= 32; y++) {
+		con_set_xy(x, y);
+		_putch('|');
+	}
+	x = 33;
+	for (int y = 1; y <= 32; y++) {
+		con_set_xy(x, y);
+		_putch('|');
+	}
+}
+
+int main(int argc, char* argv[]) {
+	State6502 state;
+	clear_state(&state);
+	state.memory = malloc(MEMORY_SIZE);
+	memset(state.memory, 0, MEMORY_SIZE);
+	//load a binary
+	byte* bin = read_bin();
+
+	memcpy(state.memory + PRG_START, bin, glob_file_size);
+
+	state.pc = PRG_START;
+	//white - 0x0F
+	print_frame();
+	//update screen every N ticks
+	do
+	{
+		con_set_xy(40, 8);
+		printf("                                        ");
+		con_set_xy(40, 8);
+		//disassemble_6502(state.memory, state.pc);
+		for (int i = 0; i < 32; i++) {
+			emulate_6502_op(&state);
+			check_keys();
+			state.memory[0xFF] = last_key & 0xFF;
+		}
+		print_mem(&state);
+		print_state_debug(&state);
+		print_stack(&state);
+		state.memory[0xfe] = rand() & 0xFF;
+	} while (state.flags.b != 1);
+}
\ No newline at end of file