Add objdiff setup

This is intended more as a proof of concept as we figure things out
than the start of an actual decompilation in this repository.  Target
object files are currently "bring your own."

objdiff/Makefile

@@ -0,0 +1,10 @@
+all: src/Jet2.obj
+
+# Simple inference rule for producing object files
+.SUFFIXES: .cpp .obj
+.cpp.obj:
+	CL.EXE /nologo /Wall /TP /W3 /O2 /G6 /MT /GX /Fo$@ /c $<
+
+# Header files used for each object
+src/Jet2.obj: src/Core.hpp src/D3D.hpp src/MMatrix.hpp src/Std.hpp\
+              src/Win32.hpp

objdiff/objdiff.json

@@ -0,0 +1,22 @@
+{
+  "custom_make": "NMAKE.EXE",
+  "watch_patterns": [
+    "*.cpp",
+    "*.hpp"
+  ],
+  "units": [
+    {
+      "name": "Jet2",
+      "target_path": "target/Jet2.obj",
+      "base_path": "src/Jet2.obj",
+      "complete": true,
+      "metadata": {
+        "source_path": "src/Jet2.cpp"
+      },
+      "symbol_mappings": {
+        "FUN_00187710": "$L514",
+        "FUN_0018771b": "$L522"
+      }
+    }
+  ]
+}

objdiff/src/Core.cpp

@@ -0,0 +1 @@
+#include "Core.hpp"

objdiff/src/Core.hpp

@@ -0,0 +1,189 @@
+/* JSRF Decompilation: Core.hpp
+Game and GameObj classes that form the foundation of the JSRF game code.
+*/
+
+#ifndef CORE_HPP
+#define CORE_HPP
+
+#include "D3D.hpp"
+#include "MMatrix.hpp"
+#include "Std.hpp"
+#include "Win32.hpp"
+
+
+// TODO; move to header for Graphics COM object in Smilebit libraries
+struct GraphicsPerformanceCounters {
+	unsigned fps;
+	unsigned trianglesPerSecond;
+	unsigned frameTriangleCnt;
+	unsigned unknown0xC;
+	unsigned unknown0x10;
+	unsigned unknown0x14;
+};
+
+// Base class of most objects (and everything in g_game->objects)
+class GameObj {
+	enum GameObjFlags {
+		GOF_SOMETHINGLINKED_ALTLIST    = 1 <<  0,
+		GOF_SKIPDRAWCHILDREN           = 1 << 16,
+		GOF_SKIPDRAWASCHILD            = 1 << 18,
+		GOF_SKIPDRAWASROOT             = 1 << 22,
+		GOF_EXCLUDEFROMSOMETHINGLINKED = 1 << 30,
+		GOF_DELETEAFTEREXEC            = 1 << 31
+	} flags;
+
+	// Position in g_game->objects array
+	// Different indices and ranges are dedicated to different kinds of
+	// objecs.
+	enum GameObjIndex {
+		OBJ_NOTINDEXED = -1, // Not stored in array
+		OBJ_DIRECTOR   =  0
+		// TODO
+	} index;
+
+	unsigned  otherBitfield;
+	float     reverseSortKey; // Sign flipped to produced sortKey
+	unsigned  sortKey;        // Four-level key, one byte each
+	D3DVECTOR someTranslation;
+
+	// Links forming a tree of objects
+	GameObj * parent;
+	GameObj * firstChild;
+	GameObj * prevSibling;
+	GameObj * nextSibling;
+
+	// Some kind of linked list walked during rendering
+	GameObj *     somethingLinkedNext;
+	GameObj * *   somethingLinkedPrevNext;
+	GameObj * * * somethingLinkedEndNextPtr;
+
+	// Another linked list sort of arrangement
+	GameObj * someKindOfNextObj;
+
+public:
+	virtual ~GameObj();
+	GameObj(GameObj * parent, GameObjIndex index, GameObjFlags flags);
+
+	// Each frame, one of these trios of methods is called depending on
+	// which state the game is in
+	// Default implementation of each does nothing; inheriting objects
+	// override these methods to run some code during each phase of each
+	// frame.
+	virtual void execDefault();
+	virtual void postExecDefault();
+	virtual void drawDefault();
+
+	virtual void execEvent();
+	virtual void postExecEvent();
+	virtual void drawEvent();
+
+	virtual void execCoveredPause();
+	virtual void postExecCoveredPause();
+	virtual void drawCoveredPause();
+
+	virtual void execFreezeCam();
+	virtual void postExecFreezeCam();
+	virtual void drawFreezeCam();
+
+	virtual void execUncoveredPause();
+	virtual void postExecUncoveredPause();
+	virtual void drawUncoveredPause();
+
+	// TODO: non-virtual methods
+};
+
+// Top-level globally-accessible "god object" that runs the main loop and
+// provides global access to most other objects and many variables
+extern class Game {
+	char         unknown0x4[4];
+	unsigned     unknown0x8;
+	unsigned *   unknown0xC;
+	int          initState;
+	unsigned     unknown0x14;
+	BOOL         drawProfilingInfo;
+	int          unknown0x1C;
+	BOOL         logosStarted;
+	BOOL         fatalErr;
+
+	D3DCOLOR     colour;
+	D3DCOLOR     ambientColour;
+	D3DCOLOR     shadowColour;
+	D3DCOLOR     bgColour;
+	D3DCOLOR     bgColourFallback;
+	BOOL         useFallbackBgColour;
+
+	// Game state used to select GameObj methods to call in main loop
+	// If multiple states are acivated, the precedence is
+	//     coveredPause > Event > FreezeCam > UncoveredPause > Default
+	BOOL         coveredPause;   // Game paused with world not visible
+	BOOL         event;          // Events (cutscenes)
+	BOOL         freezeCam;      // Time-frozen camera shots
+	BOOL         uncoveredPause; // Game paused with world visible, or
+	                             // automatic pause at start of mission
+
+	BOOL         setCoveredPauseNextFrame;
+	BOOL         unsetCoveredPauseNextFrame;
+	BOOL         setEventNextFrame;
+	BOOL         unsetEventNextFrame;
+	BOOL         setFreezeCamNextFrame;
+	BOOL         unsetFreezeCamNextFrame;
+	BOOL         setUncoveredPauseNextFrame;
+	BOOL         unsetUncoveredPauseNextFrame;
+
+	unsigned     unknown0x70;
+	BOOL         skipDraw;
+	int          zeroedByExec;
+	GraphicsPerformanceCounters perfCounters;
+
+	enum DrawMode {
+		DRAW_YES,
+		DRAW_WAITVBLANK,
+		DRAW_NO
+	} drawMode;
+
+	// Globally accessible objects and variables
+	GameObj  *   objects[7668];
+	unsigned     globals[461]; // Items may be any 32-bit type, e.g. ptr
+
+	GameObj  *   somethingLinkedBHead;
+	GameObj  * * somethingLinkedBEndNext;
+
+	GameObj  *   somethingLinkedAHead;
+	GameObj  * * somethingLinkedAEndNext;
+
+	GameObj  *   sortedLinkedListHead;
+	GameObj  * * sortedLinkedListEndNext;
+
+	GameObj  *   linkedListsByKeyHeads  [256];
+	GameObj  * * linkedListByKeyEndNexts[256];
+
+	LARGE_INTEGER execPerfCount;
+	LARGE_INTEGER drawPerfCount;
+
+	unsigned     unknown0x87C8;
+	unsigned     unknown0x87CC;
+	unsigned     frameCnt1;
+	unsigned     unknown0x87D4;
+	unsigned     unknown0x87D8;
+	GameObj  *   rootExecObj;
+	int          frameCnt2;
+	int          frameCnt3;
+	unsigned     gameObjCnt;
+	GameObj  *   rootDrawObj;
+	int          unknown0x87F0;
+	int          unknown0x87F4;
+	Mat4         unknown0x87F8;
+	unsigned     unknown0x8838;
+	unsigned     unknown0x883C;
+
+public:
+	Game(unsigned *, unsigned);
+	virtual ~Game();
+
+	void initExecRootObj();
+	void mainLoop();
+	// TODO: other methods
+} * g_game;
+
+
+#endif

objdiff/src/D3D.hpp

@@ -0,0 +1,16 @@
+/* JSRF Decompilation: D3D.hpp
+Direct3D8 declarations.
+*/
+
+#ifndef D3D_HPP
+#define D3D_HPP
+
+#include "Win32.hpp"
+
+
+typedef DWORD D3DCOLOR;
+
+struct D3DVECTOR  { float x, y, z   ; };
+struct D3DVECTOR4 { float x, y, z, w; };
+
+#endif

objdiff/src/Jet2.cpp

@@ -0,0 +1,19 @@
+#pragma bss_seg(".data")
+
+#include "Core.hpp"
+
+
+// Address: 0x0022FCE0
+// Core.cpp really seems like a more natural place to put this, but it doesn't
+// appear to be with Core.cpp's other data in .data
+Game * g_game;
+
+
+// Address: 0x0006F9E0
+// Matching: yes
+void main(void) {
+    g_game = new Game(NULL, 0);
+    g_game->initExecRootObj();
+    g_game->mainLoop();
+    delete g_game;
+}

objdiff/src/MMatrix.cpp

@@ -0,0 +1,56 @@
+#pragma code_seg("MMATRIX")
+
+
+// Address: 0x00264C04
+Mat4 * * g_matricesHead;
+
+// Address: 0x00264C08
+Mat4 * g_matrices[3];
+
+
+// Address: 0x001BB690
+// Matching: yes
+HRESULT __stdcall initMatrices(unsigned const count) {
+/* Initialize the matrix stack with the given number of matrices.
+The requested number of matrices is rounded up to the nearest multiple of two.
+The initialized matrices are accessible through g_matrices.
+*/
+	// Allocate matrices
+	unsigned     i    = (count + 1) & 0xFFFFFFFE; // Round up
+	Mat4 * const mats = (Mat4 *)VirtualAlloc(
+		NULL,
+		(i + 2) * sizeof *mats,
+		MEM_COMMIT|MEM_RESERVE,
+		PAGE_READWRITE
+	);
+	if (mats != NULL) {
+		Mat4 * mat = mats + 2;
+
+		// Initialize each matrix to identity
+		if (i > 0) for (; i > 0; i--) {
+			float * entry = (float *)mat;
+
+			for (unsigned j = 0; j < sizeof *mat/sizeof *entry; j++) {
+				*entry  = 0;
+				entry  += 1;
+			}
+
+			(*mat)[3].w = 1;
+			(*mat)[2].z = 1;
+			(*mat)[1].y = 1;
+			(*mat)[0].x = 1;
+			mat++;
+		}
+
+		// Assign to g_matrices for later access
+		mat            = mats + 2;
+		g_matrices[1]  = mats;
+		g_matrices[2]  = mat;
+		g_matrices[0]  = mats;
+		g_matricesHead = g_matrices + 2;
+
+		return ERROR_SUCCESS;
+	}
+
+	return E_OUTOFMEMORY;
+}

objdiff/src/MMatrix.hpp

@@ -0,0 +1,14 @@
+/* JSRF Decompilation: MMatrix.hpp
+Smilebit's stack-based matrix math library.
+*/
+
+#ifndef MMATRIX_HPP
+#define MMATRIX_HPP
+
+#include "D3D.hpp"
+
+
+// 4x4 matrix type
+typedef D3DVECTOR4 Mat4[4];
+
+#endif

objdiff/src/Std.hpp

@@ -0,0 +1,12 @@
+/* JSRF Decompilation: Std.hpp
+C(++) standard library definitions.  Implemented in the repository instead of
+linking to an outside stdlib to ensure consistency (this may not actually be
+possible to accomplish, but we'll go for it for now).
+*/
+
+#ifndef STD_HPP
+#define STD_HPP
+
+#define NULL 0
+
+#endif

objdiff/src/Win32.hpp

@@ -0,0 +1,40 @@
+/* JSRF Decompilation: Win32.hpp
+Definitions normally provided by Windows headers.
+*/
+
+#ifndef WIN32_HPP
+#define WIN32_HPP
+
+// The famous Win32 typedefs
+typedef unsigned char    UCHAR;
+typedef          char     CHAR;
+typedef unsigned short   USHORT;
+typedef          short    SHORT;
+typedef unsigned int     UINT;
+typedef          int      INT;
+typedef unsigned long    ULONG;
+typedef          long     LONG;
+typedef unsigned __int64 ULONGLONG;
+typedef          __int64  LONGLONG;
+
+typedef unsigned char  BYTE;
+typedef unsigned short WORD;
+typedef unsigned long  DWORD;
+
+typedef int   BOOL;
+typedef float FLOAT;
+
+// 64-bit integer compatibility type
+union LARGE_INTEGER {
+    struct {
+        DWORD LowPart;
+        LONG HighPart;
+    };
+    struct {
+        DWORD LowPart;
+        LONG HighPart;
+    } u;
+    LONGLONG QuadPart;
+};
+
+#endif