first commit

README.md

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+# Intro
+
+The aim of this project is to reverse GTA III for PC by replacing
+parts of the game [one by one](https://en.wikipedia.org/wiki/Ship_of_Theseus)
+such that we have a working game at all times.
+
+# Strategy
+
+A good approach is to start at the fringes of the code base,
+i.e. classes that don't depend on code that we don't have reversed yet.
+If a function uses only few unreversed functions that would be inconvenient
+to reverse at the time, calling the original functions is acceptable.
+
+# Progress
+
+This is a list of some things that have been reversed to some non-trivial extent.
+Not everything is listed, check the code.
+
+```
+CPool
+CTxdStore
+CVector
+CVector2D
+CMatrix
+CModelInfo
+CBaseModelInfo
+CSimpleModelInfo
+CTimeModelInfo
+CClumpModelInfo
+CPedModelInfo
+CVehicleModelInfo
+CVisibilityPlugins
+CRenderer
+CEntity
+CPhysical
+CCollision
+CCullZones
+CTheZones
+CPathFind
+```
+
+# Low hanging fruit
+
+There are a couple of things that have been reversed for other projects
+already that could probably be put into this project without too much effort.
+Again, the list is not complete:
+
+* Animation (https://github.com/aap/iii_anim)
+* File Loader (https://github.com/aap/librwgta/tree/master/tools/IIItest)
+* ...
+
+# Coding style
+
+I started writing in [Plan 9 style](http://man.cat-v.org/plan_9/6/style),
+but realize that this is not the most popular style, so I'm willing to compromise.
+Try not to deviate too much so the code will look similar across the whole project.
+
+To give examples, these two styles (or anything in between) are fine:
+
+```
+type
+functionname(args)
+{
+	if(a == b){
+		s1;
+		s2;
+	}
+	if(x != y)
+		s3;
+}
+
+type functionname(args)
+{
+	if (a == b) {
+		s1;
+		s2;
+	}
+	if (x != y)
+		s3;
+}
+```
+
+This one (or anything more extreme) is heavily discouraged:
+
+```
+type functionname ( args )
+{
+  if ( a == b )
+  {
+    s1;
+    s2;
+  }
+  if ( x != y )
+  {
+    s3;
+  }
+}
+```
+
+Indentation is done with TABS.
+

premake5.cmd

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+premake5 vs2015

premake5.lua

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+workspace "re3"
+	configurations { "Release","Debug" }
+	location "build"
+
+	files { "src/*.*" }
+	files { "src/math/*.*" }
+	files { "src/modelinfo/*.*" }
+	files { "src/entities/*.*" }
+	files { "src/render/*.*" }
+
+	includedirs { "src", "src/modelinfo" }
+	includedirs { "src", "src/entities" }
+	includedirs { "src", "src/render" }
+	includedirs { os.getenv("RWSDK33") }
+
+project "re3"
+	kind "SharedLib"
+	language "C++"
+	targetname "re3"
+	targetdir "bin/%{cfg.buildcfg}"
+	targetextension ".dll"
+	characterset ("MBCS")
+
+	filter "configurations:Debug"
+		defines { "DEBUG" }
+		flags { "StaticRuntime" }
+		symbols "On"
+		debugdir "C:/Users/aap/games/gta3_re"
+		debugcommand "C:/Users/aap/games/gta3_re/gta3.exe"
+		postbuildcommands "copy /y \"$(TargetPath)\" \"C:\\Users\\aap\\games\\gta3_re\\plugins\\re3.dll\""
+
+	filter "configurations:Release"
+		defines { "NDEBUG" }
+		optimize "On"
+		flags { "StaticRuntime" }
+		debugdir "C:/Users/aap/games/gta3_re"
+		debugcommand "C:/Users/aap/games/gta3_re/gta3.exe"
+		postbuildcommands "copy /y \"$(TargetPath)\" \"C:\\Users\\aap\\games\\gta3_re\\plugins\\re3.dll\""

src/Camera.cpp

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+#include "common.h"
+#include "patcher.h"
+#include "Draw.h"
+#include "Camera.h"
+
+CCamera &TheCamera = *(CCamera*)0x6FACF8;
+
+bool
+CCamera::IsSphereVisible(const CVector &center, float radius, const CMatrix *mat)
+{
+	RwV3d c;
+	c = *(RwV3d*)&center;
+	RwV3dTransformPoints(&c, &c, 1, &mat->m_matrix);
+	if(c.y + radius < CDraw::GetNearClipZ()) return false;
+	if(c.y - radius > CDraw::GetFarClipZ()) return false;
+	if(c.x*m_vecFrustumNormals[0].x + c.y*m_vecFrustumNormals[0].y > radius) return false;
+	if(c.x*m_vecFrustumNormals[1].x + c.y*m_vecFrustumNormals[1].y > radius) return false;
+	if(c.y*m_vecFrustumNormals[2].y + c.z*m_vecFrustumNormals[2].z > radius) return false;
+	if(c.y*m_vecFrustumNormals[3].y + c.z*m_vecFrustumNormals[3].z > radius) return false;
+	return true;
+}
+
+bool
+CCamera::IsPointVisible(const CVector &center, const CMatrix *mat)
+{
+	RwV3d c;
+	c = *(RwV3d*)&center;
+	RwV3dTransformPoints(&c, &c, 1, &mat->m_matrix);
+	if(c.y < CDraw::GetNearClipZ()) return false;
+	if(c.y > CDraw::GetFarClipZ()) return false;
+	if(c.x*m_vecFrustumNormals[0].x + c.y*m_vecFrustumNormals[0].y > 0.0f) return false;
+	if(c.x*m_vecFrustumNormals[1].x + c.y*m_vecFrustumNormals[1].y > 0.0f) return false;
+	if(c.y*m_vecFrustumNormals[2].y + c.z*m_vecFrustumNormals[2].z > 0.0f) return false;
+	if(c.y*m_vecFrustumNormals[3].y + c.z*m_vecFrustumNormals[3].z > 0.0f) return false;
+	return true;
+}
+
+bool
+CCamera::IsBoxVisible(RwV3d *box, const CMatrix *mat)
+{
+	int i;
+	int frustumTests[6] = { 0 };
+	RwV3dTransformPoints(box, box, 8, &mat->m_matrix);
+
+	for(i = 0; i < 8; i++){
+		if(box[i].y < CDraw::GetNearClipZ()) frustumTests[0]++;
+		if(box[i].y > CDraw::GetFarClipZ()) frustumTests[1]++;
+		if(box[i].x*m_vecFrustumNormals[0].x + box[i].y*m_vecFrustumNormals[0].y > 0.0f) frustumTests[2]++;
+		if(box[i].x*m_vecFrustumNormals[1].x + box[i].y*m_vecFrustumNormals[1].y > 0.0f) frustumTests[3]++;
+//	Why not test z?
+//		if(box[i].y*m_vecFrustumNormals[2].y + box[i].z*m_vecFrustumNormals[2].z > 0.0f) frustumTests[4]++;
+//		if(box[i].y*m_vecFrustumNormals[3].y + box[i].z*m_vecFrustumNormals[3].z > 0.0f) frustumTests[5]++;
+	}
+	for(i = 0; i < 6; i++)
+		if(frustumTests[i] == 8)
+			return false;		// Box is completely outside of one plane
+	return true;
+}
+
+
+STARTPATCHES
+	InjectHook(0x42C760, &CCamera::IsSphereVisible, PATCH_JUMP);
+ENDPATCHES