Let us start here, from square one. No, from Zero!

2022-09-30 22:45:51 +09:00
parent 14215af0d1
commit b7a60638a4
1005 changed files with 303069 additions and 0 deletions
@@ -0,0 +1,158 @@
+#include "gunio.h"
+#include "util/logging.h"
+
+bool games::mga::SpiceGearGunHandle::open(LPCWSTR lpFileName) {
+    if (wcscmp(lpFileName, L"COM1") != 0) {
+        return false;
+    }
+    log_info("metalgear", "Opened gun device on COM1");
+    return true;
+}
+
+int games::mga::SpiceGearGunHandle::read(LPVOID lpBuffer, DWORD nNumberOfBytesToRead) {
+
+    // minimum buffer size
+    if ((command == 0u) || nNumberOfBytesToRead < 2)
+        return 0;
+
+    // execute command
+    int bytes_read = 0;
+    switch (command) {
+        case 0x04: // get version
+
+            // write version
+            *((unsigned char *) lpBuffer + bytes_read++) = version;
+
+            break;
+        case 0x08: // get input state
+        {
+            // check buffer size
+            if (nNumberOfBytesToRead < 12)
+                return 0;
+
+            // get cursor position
+            POINT cursor_pos{};
+            GetCursorPos(&cursor_pos);
+
+            // get screen size
+            RECT screen_size{};
+            GetWindowRect(GetDesktopWindow(), &screen_size);
+            auto screen_width = (unsigned short) (screen_size.right - screen_size.left);
+            auto screen_height = (unsigned short) (screen_size.bottom - screen_size.top);
+
+            // calculate cursor position
+            p1_x = (unsigned short) (((cursor_pos.x * 1024) / screen_width) % 1024);
+            p1_y = (unsigned short) (1024 - (((cursor_pos.y * 1024) / screen_height) % 1024));
+
+            // gun P1
+            *((unsigned char *) lpBuffer + bytes_read++) = 0x00;
+            *((unsigned char *) lpBuffer + bytes_read++) = HIBYTE(p1_x);
+            *((unsigned char *) lpBuffer + bytes_read++) = LOBYTE(p1_x);
+            *((unsigned char *) lpBuffer + bytes_read++) = HIBYTE(p1_y);
+            *((unsigned char *) lpBuffer + bytes_read++) = LOBYTE(p1_y);
+            bytes_read += 3;
+
+            // fill buffer
+            *((unsigned char *) lpBuffer + bytes_read++) = 0x75;
+            *((unsigned char *) lpBuffer + bytes_read++) = 0x75;
+            *((unsigned char *) lpBuffer + bytes_read++) = 0x75;
+
+            break;
+        }
+        case 0x0C: // not called in game - empty
+
+            // empty data
+            *((unsigned char *) lpBuffer + bytes_read++) = 0x00;
+
+            break;
+        case 0x10: // get DIP switches
+
+            // clear bits
+            *((unsigned char *) lpBuffer + bytes_read) = 0x00;
+
+            // set bits
+            if (frequency == 1)
+                *((unsigned char *) lpBuffer + bytes_read) |= 0x80;
+            if (frequency == 2)
+                *((unsigned char *) lpBuffer + bytes_read) |= 0x40;
+            if (frequency == 3)
+                *((unsigned char *) lpBuffer + bytes_read) |= 0x20;
+            if (frequency == 4)
+                *((unsigned char *) lpBuffer + bytes_read) |= 0x10;
+
+            break;
+        case 0x14: // frequency 1
+
+            // set frequency and return empty data
+            frequency = 1;
+            *((unsigned char *) lpBuffer + bytes_read++) = 0x00;
+
+            break;
+        case 0x18: // frequency 2
+
+            // set frequency and return empty data
+            frequency = 2;
+            *((unsigned char *) lpBuffer + bytes_read++) = 0x00;
+
+            break;
+        case 0x19: // frequency 3
+
+            // set frequency and return empty data
+            frequency = 3;
+            *((unsigned char *) lpBuffer + bytes_read++) = 0x00;
+
+            break;
+        case 0x1A: // frequency 4
+
+            // set frequency and return empty data
+            frequency = 4;
+            *((unsigned char *) lpBuffer + bytes_read++) = 0x00;
+
+            break;
+        case 0x1C: // led board check
+
+            // check buffer size
+            if (nNumberOfBytesToRead < 11)
+                return 0;
+
+            // set all bits
+            memset(lpBuffer, 0xFF, 10);
+            bytes_read += 10;
+
+            break;
+        default:
+            log_warning("metalgear", "unknown opcode: 0x{:02X}", command);
+            *((unsigned char *) lpBuffer + bytes_read++) = 0x01;
+    }
+
+    // reset command
+    command = 0;
+
+    // calculate checksum
+    unsigned char checksum = 0xFF;
+    for (int i = 0; i < bytes_read; i++)
+        checksum -= *((unsigned char *) lpBuffer + i);
+    *((unsigned char *) lpBuffer + bytes_read++) = checksum;
+
+    // return amount of bytes read
+    return bytes_read;
+}
+
+int games::mga::SpiceGearGunHandle::write(LPCVOID lpBuffer, DWORD nNumberOfBytesToWrite) {
+
+    // save command
+    if (nNumberOfBytesToWrite > 0)
+        command = *((unsigned char *) lpBuffer);
+
+    return (int) nNumberOfBytesToWrite;
+}
+
+int games::mga::SpiceGearGunHandle::device_io(DWORD dwIoControlCode, LPVOID lpInBuffer, DWORD nInBufferSize,
+                                              LPVOID lpOutBuffer, DWORD nOutBufferSize) {
+    return -1;
+}
+
+bool games::mga::SpiceGearGunHandle::close() {
+    log_info("metalgear", "Closed gun device on COM1");
+    return true;
+}