CameraHook

#include "Hooks_Camera.h"
#include "GameCamera.h"
#include "PapyrusEvents.h"
#include "SafeWrite.h"
#include <queue>

static const UInt32 kInstallCameraHook_Base = 0x00653097;
static const UInt32 kInstallCameraHook_Entry_retn = kInstallCameraHook_Base + 0x05;
/*

.text:00653094                 mov     ecx, [esi+20h]
.text:00653097                 mov     eax, ecx
.text:00653099                 neg     eax
.text:0065309B                 pop     edi
.text:0065309C                 sbb     eax, eax
.text:0065309E                 pop     esi
.text:0065309F                 pop     ebx

edi - old state
ecx - new state

*/

void __stdcall InstallCameraHook(TESCameraState * oldState, TESCameraState * newState)
{
    SKSECameraEvent evn(oldState, newState);
    g_cameraEventDispatcher.SendEvent(&evn);
}

__declspec(naked) void InstallHookCamera_Entry(void)
{
    __asm
    {
        pushad
        push    ecx
        push    edi
        call    InstallCameraHook
        popad

        // overwritten code
        mov     eax, ecx
        neg     eax
        pop     edi

        jmp     [kInstallCameraHook_Entry_retn]
    }
}


void Hooks_Camera_Commit(void)
{
    WriteRelJump(kInstallCameraHook_Base, (UInt32)InstallHookCamera_Entry);
}