[FIRST SFP] Render objects[0.0]

#include <windows.h>
#include <string>
#include <assert.h>
#include "CSAMPFUNCS.h"

CSAMPFUNCS *SF = new CSAMPFUNCS();
stFontInfo *rFont;

float vect3_length(const float in[3])
{
	return sqrtf(in[0] * in[0] + in[1] * in[1] + in[2] * in[2]);
}

void vect3_vect3_sub(const float in1[3], const float in2[3], float out[3])
{
	int i;

	for (i = 0; i < 3; i++)
		out[i] = in1[i] - in2[i];
}

void CalcScreenCoors(D3DXVECTOR3 *vecWorld, D3DXVECTOR3 *vecScreen)
{
	/** C++-ifyed function 0x71DA00, formerly called by CHudSA::CalcScreenCoors **/
	// Get the static view matrix as D3DXMATRIX
	D3DXMATRIX	m((float *)(0xB6FA2C));

	// Get the static virtual screen (x,y)-sizes
	DWORD		*dwLenX = (DWORD *)(0xC17044);
	DWORD		*dwLenY = (DWORD *)(0xC17048);

	//DWORD *dwLenZ = (DWORD*)(0xC1704C);
	//double aspectRatio = (*dwLenX) / (*dwLenY);
	// Do a transformation
	vecScreen->x = (vecWorld->z * m._31) + (vecWorld->y * m._21) + (vecWorld->x * m._11) + m._41;
	vecScreen->y = (vecWorld->z * m._32) + (vecWorld->y * m._22) + (vecWorld->x * m._12) + m._42;
	vecScreen->z = (vecWorld->z * m._33) + (vecWorld->y * m._23) + (vecWorld->x * m._13) + m._43;

	// Get the correct screen coordinates
	double	fRecip = (double)1.0 / vecScreen->z;	//(vecScreen->z - (*dwLenZ));
	vecScreen->x *= (float)(fRecip * (*dwLenX));
	vecScreen->y *= (float)(fRecip * (*dwLenY));
}

float vect3_dist(const float in1[3], const float in2[3])
{
	float	dist[3];

	vect3_vect3_sub(in1, in2, dist);
	return vect3_length(dist);
}

bool CALLBACK Present(CONST RECT *pSourceRect, CONST RECT *pDestRect, HWND hDestWindowOverride, CONST RGNDATA *pDirtyRegion)
{
	if (SUCCEEDED(SF->getRender()->BeginRender()))
	{
		if (!SF->getGame()->isGTAMenuActive())
		{
			actor_info *self = SF->getSAMP()->getPlayers()->pLocalPlayer->pSAMP_Actor->pGTA_Ped;
			if (self != nullptr)
			{
				char rText[32]; // buf

				float fObjPos[3];
				float fScreen[2];
				D3DXVECTOR3 eobjpos, escreen;

				for (int i = 0; i < MAX_OBJECTS; i++)
				{
					if (SF->getSAMP()->getInfo()->pPools->pPool_Object->IsObjectExists(i))
					{
						object_info	*obj = SF->getSAMP()->getInfo()->pPools->pPool_Object->object[i]->pGTAObject;
						if (obj == nullptr)
							continue;

						fObjPos[0] = obj->base.matrix[4 * 3];
						fObjPos[1] = obj->base.matrix[4 * 3 + 1];
						fObjPos[2] = obj->base.matrix[4 * 3 + 2];

						if (vect3_dist(fObjPos, &self->base.matrix[4 * 3]) > 30.0)
							continue;

						eobjpos.x = fObjPos[0];
						eobjpos.y = fObjPos[1];
						eobjpos.z = fObjPos[2];
						CalcScreenCoors(&eobjpos, &escreen);
						fScreen[0] = escreen.x;
						fScreen[1] = escreen.y;
						fScreen[2] = escreen.z;

						if (fScreen[2] < 1.f)
							continue;

						sprintf(rText, "Object %d, model %d", i, obj->base.model_alt_id);
						rFont->Print(rText, D3DCOLOR_XRGB(255, 255, 255), fScreen[0], fScreen[1], true);
					}
				}
			}
		}

		SF->getRender()->EndRender();
	}
	return 1;
}

void CALLBACK mainloop( void )
{
	static bool init = false;
	if( !init )
	{
		if( !SF->getSAMP()->IsInitialized() )
			return;
		
		rFont = SF->getRender()->CreateNewFont("Trebuchet MS", 9, FCR_BORDER && FCR_BOLD);
		SF->getRender()->registerD3DCallback(eDirect3DDeviceMethods::D3DMETHOD_PRESENT, Present);

		init = true;
	}
}

BOOL APIENTRY DllMain( HMODULE hModule, DWORD dwReasonForCall, LPVOID lpReserved )
{
	switch ( dwReasonForCall )
	{
	case DLL_PROCESS_ATTACH:     
		SF->initPlugin( mainloop, hModule );
		break;
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:  
		break;
	}
	return TRUE;
}