Sprite/Halo

#include "pch.h"
#include "Sprite_.h"
#include "..\..\NewNetvar.h"

static BYTE* SetupCurrentView = 0;
static Vector* g_vecCurrentRenderOrigin = 0;
static Vector* g_vecCurrentVUp = 0;
static Vector* g_vecCurrentVRight = 0;
static Vector* g_vecCurrentVForward = 0;

typedef bool (__cdecl* ScreenTransformFn)(Vector& world, Vector& screen);
ScreenTransformFn ScreenTransform;

static bool bOnceSprite = false;

void Sprite_Init()
{
    if (!SetupCurrentView)
        SetupCurrentView = (BYTE*)toolkit::FindPattern_("client.dll", (PBYTE)"\x8B\x44\x24\x04\xD9\x00\x8B\x4C\x24\x08\xD9\x1D", "xxxxxxxxxxxx");
    if (!SetupCurrentView)
        DebugBreak();

    g_vecCurrentRenderOrigin = *(Vector**)(SetupCurrentView + 0x0C);
    g_vecCurrentVUp = *(Vector**)(SetupCurrentView + 0x24);
    g_vecCurrentVRight = *(Vector**)(SetupCurrentView + 0x2F);
    g_vecCurrentVForward = *(Vector**)(SetupCurrentView + 0x36);

    ScreenTransform = (ScreenTransformFn)toolkit::FindPattern_("client.dll", (PBYTE)"\x8B\x0D\x00\x00\x00\x00\x8B\x01\x8B\x90\x90\x00\x00\x00\xFF\xD2\xD9\x40\x08\x8B\x4C\x24\x04", "xx????xxxxxxxxxxxxxxxxx");
}

const Vector &CurrentViewOrigin()
{
    return *g_vecCurrentRenderOrigin;
}

const Vector &CurrentViewForward()
{
    return *g_vecCurrentVForward;
}

const Vector &CurrentViewRight()
{
    return *g_vecCurrentVRight;
}

const Vector &CurrentViewUp()
{
    return *g_vecCurrentVUp;
}

void DrawHalo(IMaterial* pMaterial, Vector& source, float scale, float const* color, float flHDRColorScale )
{
    if (!bOnceSprite)
    {
        Sprite_Init();
        bOnceSprite = true;
    }

    static unsigned int nHDRColorScaleCache = 0;
    Vector screen;
    Vector point;

    CMeshBuilder meshBuilder;
    CMatRenderContextPtr pRenderContext( materials );
    pRenderContext->Bind(pMaterial);
    IMesh* pMesh = pRenderContext->GetDynamicMesh( );
    meshBuilder.Begin( pMesh, MATERIAL_QUADS, 1 );

    // Transform source into screen space
    ScreenTransform( source, screen );

    meshBuilder.Color3fv (color);
    meshBuilder.TexCoord2f (0, 0, 1);
    VectorMA (source, -scale, CurrentViewUp(), point);
    VectorMA (point, -scale, CurrentViewRight(), point);
    meshBuilder.Position3fv (point.Base());
    meshBuilder.AdvanceVertex();

    meshBuilder.Color3fv (color);
    meshBuilder.TexCoord2f (0, 0, 0);
    VectorMA (source, scale, CurrentViewUp(), point);
    VectorMA (point, -scale, CurrentViewRight(), point);
    meshBuilder.Position3fv (point.Base());
    meshBuilder.AdvanceVertex();

    meshBuilder.Color3fv (color);
    meshBuilder.TexCoord2f (0, 1, 0);
    VectorMA (source, scale, CurrentViewUp(), point);
    VectorMA (point, scale, CurrentViewRight(), point);
    meshBuilder.Position3fv (point.Base());
    meshBuilder.AdvanceVertex();

    meshBuilder.Color3fv (color);
    meshBuilder.TexCoord2f (0, 1, 1);
    VectorMA (source, -scale, CurrentViewUp(), point);
    VectorMA (point, scale, CurrentViewRight(), point);
    meshBuilder.Position3fv (point.Base());
    meshBuilder.AdvanceVertex();

    meshBuilder.End();
    pMesh->Draw();
}