feat: added runtime frame decoder and entrypoint

ps2xRuntime/include/ps2_runtime.h

@@ -380,7 +380,7 @@ public:
     PS2Runtime();
     ~PS2Runtime();
 
-    bool initialize();
+    bool initialize(const char *title = "PS2 Game");
     bool loadELF(const std::string &elfPath);
     void run();
 
@@ -390,7 +390,7 @@ public:
     RecompiledFunction lookupFunction(uint32_t address);
 
     void SignalException(R5900Context *ctx, PS2Exception exception);
-    
+
     void executeVU0Microprogram(uint8_t *rdram, R5900Context *ctx, uint32_t address);
     void vu0StartMicroProgram(uint8_t *rdram, R5900Context *ctx, uint32_t address);
 
@@ -405,6 +405,13 @@ public:
     void handleTLBP(uint8_t *rdram, R5900Context *ctx);
     void clearLLBit(R5900Context *ctx);
 
+public:
+    inline R5900Context &cpu() { return m_cpuContext; }
+    inline const R5900Context &cpu() const { return m_cpuContext; }
+
+    inline PS2Memory &memory() { return m_memory; }
+    inline const PS2Memory &memory() const { return m_memory; }
+
 public:
     bool check_overflow = false;
 

ps2xRuntime/include/ps2_syscalls.h

@@ -2,6 +2,9 @@
 #define PS2_SYSCALLS_H
 
 #include "ps2_runtime.h"
+#include <mutex>
+
+static std::mutex g_sys_fd_mutex;
 
 #define PS2_FIO_O_RDONLY 0x0001
 #define PS2_FIO_O_WRONLY 0x0002

ps2xRuntime/src/main.cpp

@@ -14,7 +14,7 @@ int main(int argc, char *argv[])
     std::string elfPath = argv[1];
 
     PS2Runtime runtime;
-    if (!runtime.initialize())
+    if (!runtime.initialize("ps2xRuntime (Raylib host)"))
     {
         std::cerr << "Failed to initialize PS2 runtime" << std::endl;
         return 1;

ps2xRuntime/src/ps2_runtime.cpp

@@ -3,6 +3,7 @@
 #include <fstream>
 #include <algorithm>
 #include <cstring>
+#include "raylib.h"
 
 #define ELF_MAGIC 0x464C457F // "\x7FELF" in little endian
 #define ET_EXEC 2            // Executable file
@@ -46,6 +47,16 @@ struct ProgramHeader
 };
 
 #define PT_LOAD 1 // Loadable segment
+ 
+static constexpr int FB_WIDTH = 640;
+static constexpr int FB_HEIGHT = 448;
+static constexpr uint32_t DEFAULT_FB_ADDR = 0x00100000; // location in RDRAM the guest will draw to
+
+static void UploadFrame(Texture2D &tex, PS2Runtime *rt)
+{
+    uint8_t *src = rt->memory().getRDRAM() + (DEFAULT_FB_ADDR & 0x1FFFFFFF);
+    UpdateTexture(tex, src);
+}
 
 PS2Runtime::PS2Runtime()
 {
@@ -68,7 +79,7 @@ PS2Runtime::~PS2Runtime()
     m_functionTable.clear();
 }
 
-bool PS2Runtime::initialize()
+bool PS2Runtime::initialize(const char *title)
 {
     if (!m_memory.initialize())
     {
@@ -76,6 +87,10 @@ bool PS2Runtime::initialize()
         return false;
     }
 
+    SetConfigFlags(FLAG_WINDOW_RESIZABLE);
+    InitWindow(FB_WIDTH, FB_HEIGHT, title);
+    SetTargetFPS(60);
+
     return true;
 }
 
@@ -163,7 +178,7 @@ PS2Runtime::RecompiledFunction PS2Runtime::lookupFunction(uint32_t address)
 
     std::cerr << "Warning: Function at address 0x" << std::hex << address << std::dec << " not found" << std::endl;
 
-    static RecompiledFunction defaultFunction = [](uint8_t *rdram, R5900Context *ctx, PS2Runtime* runtime)
+    static RecompiledFunction defaultFunction = [](uint8_t *rdram, R5900Context *ctx, PS2Runtime *runtime)
     {
         std::cerr << "Error: Called unimplemented function at address 0x" << std::hex << ctx->pc << std::dec << std::endl;
     };
@@ -199,7 +214,7 @@ void PS2Runtime::vu0StartMicroProgram(uint8_t *rdram, R5900Context *ctx, uint32_
 
 void PS2Runtime::handleSyscall(uint8_t *rdram, R5900Context *ctx)
 {
-    std::cout << "Syscall encountered at PC: 0x" << std::hex << ctx->pc << std::dec << std::endl; 
+    std::cout << "Syscall encountered at PC: 0x" << std::hex << ctx->pc << std::dec << std::endl;
 }
 
 void PS2Runtime::handleBreak(uint8_t *rdram, R5900Context *ctx)
@@ -268,6 +283,30 @@ void PS2Runtime::run()
         entryPoint(m_memory.getRDRAM(), &m_cpuContext, this);
 
         std::cout << "Program execution completed successfully" << std::endl;
+
+        // A blank image to use as a framebuffer
+        Image blank = GenImageColor(FB_WIDTH, FB_HEIGHT, BLANK);
+        Texture2D frameTex = LoadTextureFromImage(blank);
+        UnloadImage(blank);
+
+        while (!WindowShouldClose())
+        {
+            // TODO step only a small slice each host
+			auto self = this;
+            lookupFunction(memory().read32(0))(
+                memory().getRDRAM(),
+                &cpu(),
+                self);
+
+            UploadFrame(frameTex, self);
+
+            BeginDrawing();
+            ClearBackground(BLACK);
+            DrawTexture(frameTex, 0, 0, WHITE);
+            EndDrawing();
+        }
+
+        CloseWindow();
     }
     catch (const std::exception &e)
     {

ps2xRuntime/src/ps2_syscalls.cpp

@@ -484,7 +484,11 @@ namespace ps2_syscalls
             return;
         }
 
-        size_t bytesRead = ::fread(hostBuf, 1, size, fp);
+        size_t bytesRead = 0;
+        {
+            std::lock_guard<std::mutex> lock(g_sys_fd_mutex);
+            bytesRead = fread(hostBuf, 1, size, fp);
+        }
 
         if (bytesRead < size && ferror(fp))
         {