From 7425d9a5b2ec41821265416b3383f1a3f0e20293 Mon Sep 17 00:00:00 2001
From: Jan Racek <racek.janek@gmail.com>
Date: Sun, 29 Mar 2026 12:47:05 +0200
Subject: [PATCH] Fixed psyqo-lua problems

---
 Makefile                 |   6 +-
 src/fixedpoint_patch.h   | 201 +++++++++++++++++++++++++++++++++++++++
 src/loadbuffer_patch.cpp |  48 ++++++++++
 src/scenemanager.cpp     |  29 +++---
 4 files changed, 271 insertions(+), 13 deletions(-)
 create mode 100644 src/fixedpoint_patch.h
 create mode 100644 src/loadbuffer_patch.cpp

diff --git a/Makefile b/Makefile
index bdbeef8..785a9f1 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,8 @@ src/bvh.cpp \
 src/cutscene.cpp \
 src/uisystem.cpp \
 src/loadingscreen.cpp \
-src/memoverlay.cpp
+src/memoverlay.cpp \
+src/loadbuffer_patch.cpp
 
 # LOADER=cdrom  → CD-ROM backend (for ISO builds on real hardware)
 # LOADER=pcdrv  → PCdrv backend (default, emulator + SIO1)
@@ -58,4 +59,7 @@ LDFLAGS := $(subst psyqo_realloc,lua_oom_realloc,$(LDFLAGS))
 # NOPARSER=1  → Use precompiled bytecode, strip Lua parser from runtime (~25KB savings)
 ifeq ($(NOPARSER),1)
 LIBRARIES := $(subst liblua.a,liblua-noparser.a,$(LIBRARIES))
+# Wrap luaL_loadbufferx to intercept psyqo-lua's source-text FixedPoint
+# metatable init and redirect it to pre-compiled bytecode.
+LDFLAGS += -Wl,--wrap=luaL_loadbufferx
 endif
diff --git a/src/fixedpoint_patch.h b/src/fixedpoint_patch.h
new file mode 100644
index 0000000..6c0e47c
--- /dev/null
+++ b/src/fixedpoint_patch.h
@@ -0,0 +1,201 @@
+#pragma once
+
+// Pre-compiled PS1 Lua bytecode for psyqo FixedPoint metatable script.
+// Compiled from the R"lua(...)lua" source in psyqo-lua/src/lua.cpp.
+// This intercepts the source-text loadBuffer call so NOPARSER builds work.
+// 2301 bytes
+
+static const unsigned char FIXEDPOINT_PATCHED_BYTECODE[] = {
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+    0x00, 0x06, 0x24, 0x00, 0x00, 0x00, 0x86, 0x00, 0x40, 0x00, 0xc0, 0x00,
+    0x80, 0x00, 0x9d, 0x80, 0x00, 0x01, 0x18, 0x40, 0x40, 0x01, 0x17, 0x80,
+    0x02, 0x80, 0x87, 0x80, 0xc0, 0x00, 0x9b, 0x00, 0x00, 0x00, 0x17, 0xc0,
+    0x01, 0x80, 0x87, 0x80, 0x40, 0x00, 0xc7, 0x80, 0xc0, 0x00, 0x5a, 0xc0,
+    0x00, 0x01, 0x17, 0x00, 0x00, 0x80, 0x83, 0x40, 0x00, 0x00, 0x83, 0x00,
+    0x80, 0x00, 0x9f, 0x00, 0x00, 0x01, 0x17, 0x80, 0x04, 0x80, 0x86, 0x00,
+    0x40, 0x00, 0xc0, 0x00, 0x80, 0x00, 0x9d, 0x80, 0x00, 0x01, 0x18, 0xc0,
+    0x40, 0x01, 0x17, 0x80, 0x02, 0x80, 0x87, 0x80, 0x40, 0x00, 0xc5, 0x00,
+    0x80, 0x00, 0x00, 0x01, 0x80, 0x00, 0x41, 0x01, 0x01, 0x00, 0xdd, 0x80,
+    0x80, 0x01, 0x5a, 0xc0, 0x00, 0x01, 0x17, 0x00, 0x00, 0x80, 0x83, 0x40,
+    0x00, 0x00, 0x83, 0x00, 0x80, 0x00, 0x9f, 0x00, 0x00, 0x01, 0x17, 0x80,
+    0x00, 0x80, 0x85, 0x00, 0x00, 0x01, 0xc1, 0x40, 0x01, 0x00, 0x9d, 0x40,
+    0x00, 0x01, 0x1f, 0x00, 0x80, 0x00, 0x06, 0x00, 0x00, 0x00, 0x04, 0x05,
+    0x00, 0x00, 0x00, 0x74, 0x79, 0x70, 0x65, 0x00, 0x04, 0x06, 0x00, 0x00,
+    0x00, 0x74, 0x61, 0x62, 0x6c, 0x65, 0x00, 0x04, 0x05, 0x00, 0x00, 0x00,
+    0x5f, 0x72, 0x61, 0x77, 0x00, 0x04, 0x07, 0x00, 0x00, 0x00, 0x6e, 0x75,
+    0x6d, 0x62, 0x65, 0x72, 0x00, 0x03, 0x0c, 0x00, 0x00, 0x00, 0x04, 0x08,
+    0x00, 0x00, 0x00, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x72, 0x65, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x01,
+    0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x53, 0x00, 0x00, 0x00, 0x55, 0x00, 0x00,
+    0x00, 0x01, 0x00, 0x02, 0x03, 0x00, 0x00, 0x00, 0x47, 0x00, 0x40, 0x00,
+    0x5f, 0x00, 0x00, 0x01, 0x1f, 0x00, 0x80, 0x00, 0x01, 0x00, 0x00, 0x00,
+    0x04, 0x05, 0x00, 0x00, 0x00, 0x5f, 0x72, 0x61, 0x77, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x58, 0x00,
+    0x00, 0x00, 0x5a, 0x00, 0x00, 0x00, 0x01, 0x00, 0x04, 0x07, 0x00, 0x00,
+    0x00, 0x45, 0x00, 0x00, 0x00, 0x87, 0x00, 0x40, 0x00, 0x8d, 0x40, 0x40,
+    0x01, 0xc1, 0x80, 0x00, 0x00, 0x5e, 0x00, 0x80, 0x01, 0x5f, 0x00, 0x00,
+    0x00, 0x1f, 0x00, 0x80, 0x00, 0x03, 0x00, 0x00, 0x00, 0x04, 0x05, 0x00,
+    0x00, 0x00, 0x5f, 0x72, 0x61, 0x77, 0x00, 0x03, 0x00, 0x08, 0x00, 0x00,
+    0x03, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
+    0x00, 0x01, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5d, 0x00, 0x00, 0x00, 0x60,
+    0x00, 0x00, 0x00, 0x02, 0x00, 0x07, 0x0f, 0x00, 0x00, 0x00, 0x18, 0x00,
+    0xc0, 0x00, 0x17, 0x00, 0x00, 0x80, 0x41, 0x40, 0x00, 0x00, 0x86, 0x80,
+    0x40, 0x00, 0xcb, 0x40, 0x00, 0x00, 0x05, 0x01, 0x80, 0x00, 0x40, 0x01,
+    0x00, 0x00, 0x81, 0x01, 0x01, 0x00, 0x1d, 0x81, 0x80, 0x01, 0x0d, 0x41,
+    0x00, 0x02, 0xca, 0x00, 0x81, 0x81, 0x06, 0x41, 0x41, 0x00, 0x9e, 0x00,
+    0x80, 0x01, 0x9f, 0x00, 0x00, 0x00, 0x1f, 0x00, 0x80, 0x00, 0x06, 0x00,
+    0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x04, 0x0d, 0x00, 0x00,
+    0x00, 0x73, 0x65, 0x74, 0x6d, 0x65, 0x74, 0x61, 0x74, 0x61, 0x62, 0x6c,
+    0x65, 0x00, 0x04, 0x05, 0x00, 0x00, 0x00, 0x5f, 0x72, 0x61, 0x77, 0x00,
+    0x03, 0x0c, 0x00, 0x00, 0x00, 0x04, 0x0b, 0x00, 0x00, 0x00, 0x46, 0x69,
+    0x78, 0x65, 0x64, 0x50, 0x6f, 0x69, 0x6e, 0x74, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
+    0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
diff --git a/src/loadbuffer_patch.cpp b/src/loadbuffer_patch.cpp
new file mode 100644
index 0000000..943f2af
--- /dev/null
+++ b/src/loadbuffer_patch.cpp
@@ -0,0 +1,48 @@
+// Linker --wrap intercept for luaL_loadbufferx.
+//
+// psyqo-lua's FixedPoint metatable setup (at the pinned nugget commit)
+// loads Lua SOURCE text via loadBuffer. With NOPARSER, the parser stub
+// rejects it with "parser not loaded". This wrapper intercepts that
+// specific call and redirects it to pre-compiled bytecode.
+//
+// All other loadBuffer calls pass through to the real implementation.
+
+#include "fixedpoint_patch.h"
+
+extern "C" {
+
+// The real luaL_loadbufferx provided by liblua
+int __real_luaL_loadbufferx(void* L, const char* buff, unsigned int size,
+                            const char* name, const char* mode);
+
+int __wrap_luaL_loadbufferx(void* L, const char* buff, unsigned int size,
+                            const char* name, const char* mode) {
+    // Check if this is the fixedpoint script load from psyqo-lua.
+    // The name is "buffer:fixedPointScript" in the pinned nugget version.
+    if (name) {
+        // Compare the first few chars to identify the fixedpoint load
+        const char* expected = "buffer:fixedPointScript";
+        const char* a = name;
+        const char* b = expected;
+        bool match = true;
+        while (*b) {
+            if (*a != *b) { match = false; break; }
+            a++;
+            b++;
+        }
+        if (match && *a == '\0') {
+            // Redirect to pre-compiled bytecode
+            return __real_luaL_loadbufferx(
+                L,
+                reinterpret_cast<const char*>(FIXEDPOINT_PATCHED_BYTECODE),
+                sizeof(FIXEDPOINT_PATCHED_BYTECODE),
+                "bytecode:fixedPointScript",
+                mode);
+        }
+    }
+
+    // All other calls pass through unchanged
+    return __real_luaL_loadbufferx(L, buff, size, name, mode);
+}
+
+}  // extern "C"
diff --git a/src/scenemanager.cpp b/src/scenemanager.cpp
index efd90b9..f84975f 100644
--- a/src/scenemanager.cpp
+++ b/src/scenemanager.cpp
@@ -608,22 +608,27 @@ void psxsplash::SceneManager::setObjectActive(GameObject* go, bool active) {
 }
 
 void psxsplash::SceneManager::processEnableDisableEvents() {
-    // Process any pending enable/disable flags (for batched operations)
+    // Process any pending enable/disable flags.
+    // Uses raw bit manipulation on flagsAsInt instead of the BitField
+    // accessors to avoid a known issue where the BitSpan get/set
+    // operations don't behave correctly on the MIPS target.
     for (auto* go : m_gameObjects) {
         if (!go) continue;
-        
-        if (go->isPendingEnable()) {
-            go->setPendingEnable(false);
-            if (!go->isActive()) {
-                go->setActive(true);
+
+        // Bit 1 = pendingEnable
+        if (go->flagsAsInt & 0x02) {
+            go->flagsAsInt &= ~0x02u;  // clear pending
+            if (!(go->flagsAsInt & 0x01)) {  // if not already active
+                go->flagsAsInt |= 0x01;  // set active
                 L.OnEnable(go);
             }
         }
-        
-        if (go->isPendingDisable()) {
-            go->setPendingDisable(false);
-            if (go->isActive()) {
-                go->setActive(false);
+
+        // Bit 2 = pendingDisable
+        if (go->flagsAsInt & 0x04) {
+            go->flagsAsInt &= ~0x04u;  // clear pending
+            if (go->flagsAsInt & 0x01) {  // if currently active
+                go->flagsAsInt &= ~0x01u;  // clear active
                 L.OnDisable(go);
             }
         }
@@ -848,4 +853,4 @@ int psxsplash::SceneManager::findAudioClipByName(const char* name) const {
         }
     }
     return -1;
-}
+}
\ No newline at end of file