// "Build Engine & Tools" Copyright (c) 1993-1997 Ken Silverman
// Ken Silverman's official web site: "http://www.advsys.net/ken"
// See the included license file "BUILDLIC.TXT" for license info.
// This file has been modified from Ken Silverman's original release

/* DDOI - This file is an attempt to reimplement a_nasm.asm in C */
/* FCS: However did that work: This is far from perfect but you have my eternal respect !!! */

#include "platform.h"
#include "build.h"
#include "draw.h"

int32_t pixelsAllowed = 10000000000;

uint8_t  *transluc = NULL;

static int transrev = 0;


#define shrd(a,b,c) (((b)<<(32-(c))) | ((a)>>(c)))
#define shld(a,b,c) (((b)>>(32-(c))) | ((a)<<(c)))















/* ---------------  WALLS RENDERING METHOD (USED TO BE HIGHLY OPTIMIZED ASSEMBLY) ----------------------------*/
extern int32_t asm1;
extern intptr_t asm2;
extern uint8_t *asm3;
extern int32_t asm4;

static uint8_t machxbits_al;
static uint8_t bitsSetup;
static uint8_t * textureSetup;
void sethlinesizes(int32_t i1, int32_t _bits, uint8_t * textureAddress)
{
    machxbits_al = i1;
    bitsSetup = _bits;
    textureSetup = textureAddress;
}



//FCS:   Draw ceiling/floors
//Draw a line from destination in the framebuffer to framebuffer-numPixels
void hlineasm4(int32_t numPixels, int32_t shade, uint32_t i4, uint32_t i5, uint8_t *dest){

    int32_t shifter = ((256-machxbits_al) & 0x1f);
    uint32_t source;

    uint8_t * texture = textureSetup;
    uint8_t bits = bitsSetup;

    shade = shade & 0xffffff00;
    numPixels++;

        if (!RENDER_DRAW_CEILING_AND_FLOOR)
                return;

    while (numPixels) {

            source = i5 >> shifter;
            source = shld(source,i4,bits);
            source = texture[source];

                if (pixelsAllowed-- > 0)
                        *dest = globalpalwritten[shade|source];

            dest--;

            i5 -= asm1;
            i4 -= asm2;

            numPixels--;

    }
}

static int32_t rmach_eax;
static int32_t rmach_ebx;
static int32_t rmach_ecx;
static int32_t rmach_edx;
static int32_t rmach_esi;
void setuprhlineasm4(int32_t i1, int32_t i2, int32_t i3, int32_t i4, int32_t i5, int32_t i6)
{
    rmach_eax = i1;
    rmach_ebx = i2;
    rmach_ecx = i3;
    rmach_edx = i4;
    rmach_esi = i5;
}


void rhlineasm4(int32_t i1, uint8_t* texture, int32_t i3, uint32_t i4, uint32_t i5, int32_t dest)
{
    uint32_t ebp = dest - i1;
    uint32_t rmach6b = ebp-1;
    int32_t numPixels;

    if (i1 <= 0) return;

    numPixels = i1;
    do {



            i3 = ((i3&0xffffff00)|(*texture));
            i4 -= rmach_eax;
            ebp = (((i4+rmach_eax) < i4) ? -1 : 0);
            i5 -= rmach_ebx;

            if ((i5 + rmach_ebx) < i5)
            texture -= (rmach_ecx+1);
            else
            texture -= rmach_ecx;

            ebp &= rmach_esi;
            i1 = ((i1&0xffffff00)|(((uint8_t *)i3)[rmach_edx]));

                if (pixelsAllowed-- > 0)
                         ((uint8_t *)rmach6b)[numPixels] = (i1&0xff);

            texture -= ebp;
            numPixels--;
    } while (numPixels);
}

static int32_t rmmach_eax;
static int32_t rmmach_ebx;
static int32_t rmmach_ecx;
static int32_t rmmach_edx;
static int32_t setupTileHeight;
void setuprmhlineasm4(int32_t i1, int32_t i2, int32_t i3, int32_t i4, int32_t tileHeight, int32_t i6)
{
    rmmach_eax = i1;
    rmmach_ebx = i2;
    rmmach_ecx = i3;
    rmmach_edx = i4;
    setupTileHeight = tileHeight;
}


//FCS: ????
void rmhlineasm4(int32_t i1, intptr_t shade, int32_t colorIndex, int32_t i4, int32_t i5, int32_t dest)
{
    uint32_t ebp = dest - i1;
    uint32_t rmach6b = ebp-1;
    int32_t numPixels;

    if (i1 <= 0)
        return;

    numPixels = i1;
    do {



            colorIndex = ((colorIndex&0xffffff00)|(*((uint8_t *)shade)));
            i4 -= rmmach_eax;
            ebp = (((i4+rmmach_eax) < i4) ? -1 : 0);
            i5 -= rmmach_ebx;

            if ((i5 + rmmach_ebx) < i5)
            shade -= (rmmach_ecx+1);
            else
            shade -= rmmach_ecx;

            ebp &= setupTileHeight;

        //Check if this colorIndex is the transparent color (255).
            if ((colorIndex&0xff) != 255) {
                        if (pixelsAllowed-- > 0)
                        {
                                i1 = ((i1&0xffffff00)|(((uint8_t  *)colorIndex)[rmmach_edx]));
                                ((uint8_t  *)rmach6b)[numPixels] = (i1&0xff);
                        }
            }

            shade -= ebp;
            numPixels--;

    } while (numPixels);
}


//Variable used to draw column.
//This is how much you have to skip in the framebuffer in order to be one pixel below.
static int32_t bytesperline;
void setBytesPerLine(int32_t _bytesperline)
{
    bytesperline = _bytesperline;
}



static uint8_t  mach3_al;

//FCS:  RENDER TOP AND BOTTOM COLUMN
int32_t prevlineasm1(int32_t i1, uint8_t* palette, int32_t i3, int32_t i4, uint8_t  *source, uint8_t  *dest)
{


    if (i3 == 0)
    {
                if (!RENDER_DRAW_TOP_AND_BOTTOM_COLUMN)
            return 0;

            i1 += i4;
        i4 = ((uint32_t)i4) >> mach3_al;
            i4 = (i4&0xffffff00) | source[i4];

                if (pixelsAllowed-- > 0)
                        *dest = palette[i4];



            return i1;
    } else {
            return vlineasm1(i1,palette,i3,i4,source,dest);
    }
}


//FCS: This is used to draw wall border vertical lines
int32_t vlineasm1(int32_t vince, uint8_t* palookupoffse, int32_t numPixels, int32_t vplce, uint8_t* texture, uint8_t* dest)
{
    uint32_t temp;

    if (!RENDER_DRAW_WALL_BORDERS)
                return vplce;

    numPixels++;
    while (numPixels)
    {
            temp = ((uint32_t)vplce) >> mach3_al;

            temp = texture[temp];

                if (pixelsAllowed-- > 0)
                        *dest = palookupoffse[temp];

                vplce += vince;
            dest += bytesperline;
            numPixels--;
    }
    return vplce;
}


int32_t tvlineasm1(int32_t i1, uint8_t  * texture, int32_t numPixels, int32_t i4, uint8_t  *source, uint8_t  *dest)
{
    uint8_t shiftValue = (globalshiftval & 0x1f);

        numPixels++;
        while (numPixels)
        {
                uint32_t temp = i4;
                temp >>= shiftValue;
                temp = source[temp];

            //255 is the index for transparent color index. Skip drawing this pixel.
                if (temp != 255)
                {
                        uint16_t colorIndex;

                        colorIndex = texture[temp];
                        colorIndex |= ((*dest)<<8);

                        if (transrev)
                                colorIndex = ((colorIndex>>8)|(colorIndex<<8));

                        if (pixelsAllowed-- > 0)
                                *dest = transluc[colorIndex];
                }

                i4 += i1;

        //We are drawing a column ?!
                dest += bytesperline;
                numPixels--;
        }
        return i4;
} /* tvlineasm1 */


static uint8_t  tran2shr;
static uint32_t tran2pal_ebx;
static uint32_t tran2pal_ecx;
void setuptvlineasm2(int32_t i1, int32_t i2, int32_t i3)
{
        tran2shr = (i1&0x1f);
        tran2pal_ebx = i2;
        tran2pal_ecx = i3;
} /* */


void tvlineasm2(uint32_t i1, uint32_t i2, uintptr_t i3, uintptr_t i4, uint32_t i5, uintptr_t i6)
{
        uint32_t ebp = i1;
        uint32_t tran2inca = i2;
        uint32_t tran2incb = asm1;
        uintptr_t tran2bufa = i3;
        uintptr_t tran2bufb = i4;
        uintptr_t tran2edi = asm2;
        uintptr_t tran2edi1 = asm2 + 1;

        i6 -= asm2;

        do {

                i1 = i5 >> tran2shr;
                i2 = ebp >> tran2shr;
                i5 += tran2inca;
                ebp += tran2incb;
                i3 = ((uint8_t  *)tran2bufa)[i1];
                i4 = ((uint8_t  *)tran2bufb)[i2];
                if (i3 == 255) { // skipdraw1
                        if (i4 != 255) { // skipdraw3
                                uint16_t val;
                                val = ((uint8_t  *)tran2pal_ecx)[i4];
                                val |= (((uint8_t  *)i6)[tran2edi1]<<8);

                                if (transrev)
                                        val = ((val>>8)|(val<<8));

                                if (pixelsAllowed-- > 0)
                                        ((uint8_t  *)i6)[tran2edi1] = transluc[val];
                        }
                } else if (i4 == 255) { // skipdraw2
                        uint16_t val;
                        val = ((uint8_t  *)tran2pal_ebx)[i3];
                        val |= (((uint8_t  *)i6)[tran2edi]<<8);

                        if (transrev)
                val = ((val>>8)|(val<<8));

                        if (pixelsAllowed-- > 0)
                                ((uint8_t  *)i6)[tran2edi] = transluc[val];
                } else {
                        uint16_t l = ((uint8_t  *)i6)[tran2edi]<<8;
                        uint16_t r = ((uint8_t  *)i6)[tran2edi1]<<8;
                        l |= ((uint8_t  *)tran2pal_ebx)[i3];
                        r |= ((uint8_t  *)tran2pal_ecx)[i4];
                        if (transrev) {
                                l = ((l>>8)|(l<<8));
                                r = ((r>>8)|(r<<8));
                        }
                        if (pixelsAllowed-- > 0)
                        {
                                ((uint8_t  *)i6)[tran2edi] = transluc[l];
                                ((uint8_t  *)i6)[tran2edi1] =transluc[r];
                                pixelsAllowed--;
                        }
                }
                i6 += bytesperline;
        } while (i6 > i6 - bytesperline);
        asm1 = i5;
        asm2 = ebp;
}



static uint8_t  machmv;
int32_t mvlineasm1(int32_t vince, uint8_t* palookupoffse, int32_t i3, int32_t vplce, uint8_t* texture, uint8_t  *dest)
{
    uint32_t temp;

    for(;i3>=0;i3--)
    {
                temp = ((uint32_t)vplce) >> machmv;
            temp = texture[temp];

            if (temp != 255)
                {
                        if (pixelsAllowed-- > 0)
                        *dest = palookupoffse[temp];
                }

            vplce += vince;
            dest += bytesperline;
    }
    return vplce;
}


void setupvlineasm(int32_t i1)
{
    mach3_al = (i1&0x1f);
}

//FCS This is used to fill the inside of a wall (so it draws VERTICAL column, always).
void vlineasm4(int32_t columnIndex, intptr_t framebuffer)
{

    if (!RENDER_DRAW_WALL_INSIDE)
        return ;

    int i;
    uint32_t temp;

    uintptr_t index = (framebuffer + ylookup[columnIndex]);
    uint8_t  *dest= (uint8_t *)(-ylookup[columnIndex]);

    do {
        for (i = 0; i < 4; i++)
        {

            temp = ((uint32_t)vplce[i]) >> mach3_al;
            temp = (((uint8_t *)(bufplce[i]))[temp]);

            if (pixelsAllowed-- > 0)
                dest[index+i] = palookupoffse [i] [temp];

            vplce[i] += vince[i];
        }
        dest += bytesperline;
    } while (((uint32_t)dest - bytesperline) < ((uint32_t)dest));
}


void setupmvlineasm(int32_t i1)
{
    //Only keep 5 first bits
    machmv = (i1&0x1f);
}


void mvlineasm4(int32_t column, intptr_t framebufferOffset)
{
    int i;
    uint32_t temp;
    uintptr_t index = (framebufferOffset + ylookup[column]);
    uint8_t  *dest = (uint8_t *)(-ylookup[column]);

    do {

                if (pixelsAllowed <= 0)
                        return;

        for (i = 0; i < 4; i++)
        {

              temp = ((uint32_t)vplce[i]) >> machmv;
              temp = (((uint8_t *)(bufplce[i]))[temp]);
              if (temp != 255)
                  {
                          if (pixelsAllowed-- > 0)
                                dest[index+i] = palookupoffse[i][temp];
                  }
              vplce[i] += vince[i];
        }
        dest += bytesperline;

    } while (((uint32_t)dest - bytesperline) < ((uint32_t)dest));
}
/* END ---------------  WALLS RENDERING METHOD (USED TO BE HIGHLY OPTIMIZED ASSEMBLY) ----------------------------*/





























/* ---------------  SPRITE RENDERING METHOD (USED TO BE HIGHLY OPTIMIZED ASSEMBLY) ----------------------------*/
static int32_t spal_eax;
static int32_t smach_eax;
static int32_t smach2_eax;
static int32_t smach5_eax;
static int32_t smach_ecx;
void setupspritevline(int32_t i1, int32_t i2, int32_t i3, int32_t i4, int32_t i5, int32_t i6)
{
    spal_eax = i1;
    smach_eax = (i5<<16);
    smach2_eax = (i5>>16)+i2;
    smach5_eax = smach2_eax + i4;
    smach_ecx = i3;
}


void spritevline(int32_t i1, uint32_t i2, int32_t i3, uint32_t i4, uint8_t* source, uint8_t* dest)
{


setup:

    i2 += smach_eax;
    i1 = (i1&0xffffff00) | (*source&0xff);
    if ((i2 - smach_eax) > i2)
                source += smach2_eax + 1;
    else
                source += smach2_eax;

    while(1) {

        i1 = (i1&0xffffff00) | (((uint8_t  *)spal_eax)[i1]&0xff);

        if (pixelsAllowed-- > 0)
            *dest = i1;

        dest += bytesperline;

        i4 += smach_ecx;
        i4--;
        if (!((i4 - smach_ecx) > i4) && i4 != 0)
            goto setup;

        if (i4 == 0)
            return;

        i2 += smach_eax;

        i1 = (i1&0xffffff00) | (*source&0xff);

        if ((i2 - smach_eax) > i2)
            source += smach5_eax + 1;
        else
            source += smach5_eax;
    }
}


static int32_t mspal_eax;
static int32_t msmach_eax;
static int32_t msmach2_eax;
static int32_t msmach5_eax;
static int32_t msmach_ecx;
void msetupspritevline(int32_t i1, int32_t i2, int32_t i3, int32_t i4, int32_t i5, int32_t i6)
{
    mspal_eax = i1;
    msmach_eax = (i5<<16);
    msmach2_eax = (i5>>16)+i2;
    msmach5_eax = smach2_eax + i4;
    msmach_ecx = i3;
}


void mspritevline(int32_t colorIndex, int32_t i2, int32_t i3, int32_t i4, uint8_t  * source, uint8_t  * dest)
{

setup:
    i2 += smach_eax;

    colorIndex = (colorIndex&0xffffff00) | (*source&0xff);

    if ((i2 - smach_eax) > i2)
        source += smach2_eax + 1;
    else
        source += smach2_eax;

        while(1){

        //Skip transparent pixels (index=255)
        if ((colorIndex&0xff) != 255)
        {
            colorIndex = (colorIndex&0xffffff00) | (((uint8_t  *)spal_eax)[colorIndex]&0xff);

            if (pixelsAllowed-- > 0)
                *dest = colorIndex;
        }

        dest += bytesperline;
        i4 += smach_ecx;
        i4--;

        if (!((i4 - smach_ecx) > i4) && i4 != 0)
            goto setup;

        if (i4 == 0)
            return;

        i2 += smach_eax;

        colorIndex = (colorIndex&0xffffff00) | (*source&0xff);

        if ((i2 - smach_eax) > i2)
            source += smach5_eax + 1;
        else
            source += smach5_eax;
    }
}


uint8_t * tspal;
uint32_t tsmach_eax1;
uint32_t adder;
uint32_t tsmach_eax3;
uint32_t tsmach_ecx;
void tsetupspritevline(uint8_t * palette, int32_t i2, int32_t i3, int32_t i4, int32_t i5)
{
        tspal = palette;
        tsmach_eax1 = i5 << 16;
        adder = (i5 >> 16) + i2;
        tsmach_eax3 = adder + i4;
        tsmach_ecx = i3;
}


/*
 FCS: Draw a sprite vertical line of pixels.
 */
void DrawSpriteVerticalLine(int32_t i2, int32_t numPixels, uint32_t i4, uint8_t  * texture, uint8_t  * dest)
{
    uint8_t colorIndex;

        while (numPixels)
        {
                numPixels--;

                if (numPixels != 0)
                {

                        i4 += tsmach_ecx;

                        if (i4 < (i4 - tsmach_ecx))
                adder = tsmach_eax3;

                        colorIndex = *texture;

                        i2 += tsmach_eax1;
                        if (i2 < (i2 - tsmach_eax1))
                texture++;

                        texture += adder;

            //255 is the index of the transparent color: Do not draw it.
                        if (colorIndex != 255)
                        {
                                uint16_t val;
                                val = tspal[colorIndex];
                                val |= (*dest)<<8;

                                if (transrev)
                                        val = ((val>>8)|(val<<8));

                                colorIndex = transluc[val];

                                if (pixelsAllowed-- > 0)
                                        *dest = colorIndex;
                        }

            //Move down one pixel on the framebuffer
                        dest += bytesperline;
                }


        }
}
/* END---------------  SPRITE RENDERING METHOD (USED TO BE HIGHLY OPTIMIZED ASSEMBLY) ----------------------------*/
























/* ---------------  FLOOR/CEILING RENDERING METHOD (USED TO BE HIGHLY OPTIMIZED ASSEMBLY) ----------------------------*/

void settrans(int32_t type){
        transrev = type;
}

static uint8_t  * textureData;
static uint8_t  * mmach_asm3;
static int32_t mmach_asm1;
static int32_t mmach_asm2;

void mhline(uint8_t  * texture, int32_t i2, int32_t numPixels, int32_t i4, int32_t i5, uint8_t* dest)
{
    textureData = texture;
    mmach_asm3 = asm3;
    mmach_asm1 = asm1;
    mmach_asm2 = asm2;
    mhlineskipmodify(i2,numPixels>>16,i5,dest);
}


static uint8_t  mshift_al = 26;
static uint8_t  mshift_bl = 6;
void mhlineskipmodify( uint32_t i2, int32_t numPixels, int32_t i5, uint8_t* dest)
{
    uint32_t ebx;
    int32_t colorIndex;

    while (numPixels >= 0)
    {
            ebx = i2 >> mshift_al;
            ebx = shld (ebx, (uint32_t)i5, mshift_bl);
            colorIndex = textureData[ebx];

        //Skip transparent color.
                if ((colorIndex&0xff) != 0xff){
            if (pixelsAllowed-- > 0)
                                *dest = mmach_asm3[colorIndex];
        }
            i2 += mmach_asm1;
            i5 += mmach_asm2;
            dest++;
            numPixels--;


    }
}


void msethlineshift(int32_t i1, int32_t i2)
{
    i1 = 256-i1;
    mshift_al = (i1&0x1f);
    mshift_bl = (i2&0x1f);
} /* msethlineshift */


static uint8_t * tmach_eax;
static uint8_t * tmach_asm3;
static int32_t tmach_asm1;
static int32_t tmach_asm2;

void thline(uint8_t  * i1, int32_t i2, int32_t i3, int32_t i4, int32_t i5, uint8_t * i6)
{
    tmach_eax = i1;
    tmach_asm3 = asm3;
    tmach_asm1 = asm1;
    tmach_asm2 = asm2;
    thlineskipmodify(asm2,i2,i3,i4,i5,i6);
}

static uint8_t  tshift_al = 26;
static uint8_t  tshift_bl = 6;
void thlineskipmodify(int32_t i1, uint32_t i2, uint32_t i3, int32_t i4, int32_t i5, uint8_t * i6)
{
    uint32_t ebx;
    int counter = (i3>>16);
    while (counter >= 0)
    {
            ebx = i2 >> tshift_al;
            ebx = shld (ebx, (uint32_t)i5, tshift_bl);
            i1 = tmach_eax[ebx];
            if ((i1&0xff) != 0xff)
            {
                    uint16_t val = tmach_asm3[i1];
                    val |= (*i6)<<8;

                    if (transrev)
                                val = ((val>>8)|(val<<8));

                        if (pixelsAllowed-- > 0)
                         *i6 = transluc[val];
            }

            i2 += tmach_asm1;
            i5 += tmach_asm2;
            i6++;
            counter--;


    }
}


void tsethlineshift(int32_t i1, int32_t i2)
{
    i1 = 256-i1;
    tshift_al = (i1&0x1f);
    tshift_bl = (i2&0x1f);
}




static intptr_t slopemach_ebx;
static int32_t slopemach_ecx;
static int32_t slopemach_edx;
static uint8_t  slopemach_ah1;
static uint8_t  slopemach_ah2;
static float asm2_f;
typedef union { unsigned int i; float f; } bitwisef2i;
void setupslopevlin(int32_t i1, intptr_t i2, int32_t i3)
{
    bitwisef2i c;
    slopemach_ebx = i2;
    slopemach_ecx = i3;
    slopemach_edx = (1<<(i1&0x1f)) - 1;
    slopemach_edx <<= ((i1&0x1f00)>>8);
    slopemach_ah1 = 32-((i1&0x1f00)>>8);
    slopemach_ah2 = (slopemach_ah1 - (i1&0x1f)) & 0x1f;
    c.f = asm2_f = (float)asm1;
    asm2 = c.i;
}

extern int32_t reciptable[2048];
extern int32_t globalx3, globaly3;
extern int32_t fpuasm;
#define low32(a) ((a&0xffffffff))
#define high32(a) ((int)(((__int64)a&(__int64)0xffffffff00000000)>>32))

//FCS: Render RENDER_SLOPPED_CEILING_AND_FLOOR
void slopevlin(intptr_t i1, uint32_t i2, int32_t i3, int32_t i4, int32_t i5, int32_t i6)
{
    bitwisef2i c;
    uint32_t ecx,eax,ebx,edx,esi,edi;
//This is so bad to cast asm3 to int then float :( !!!
    float a = (float)(int32_t) asm3 + asm2_f;
    i1 -= slopemach_ecx;
    esi = i5 + low32((__int64)globalx3 * (__int64)(i2<<3));
    edi = i6 + low32((__int64)globaly3 * (__int64)(i2<<3));
    ebx = i4;

        if (!RENDER_SLOPPED_CEILING_AND_FLOOR)
                return;

    do {
            // -------------
            // All this is calculating a fixed point approx. of 1/a
            c.f = a;
            fpuasm = eax = c.i;
            edx = (((int32_t)eax) < 0) ? 0xffffffff : 0;
            eax = eax << 1;
            ecx = (eax>>24);    //  exponent
            eax = ((eax&0xffe000)>>11);
            ecx = ((ecx&0xffffff00)|((ecx-2)&0xff));
            eax = reciptable[eax/4];
            eax >>= (ecx&0x1f);
            eax ^= edx;
            // -------------
            edx = i2;
            i2 = eax;
            eax -= edx;
            ecx = low32((__int64)globalx3 * (__int64)eax);
            eax = low32((__int64)globaly3 * (__int64)eax);
            a += asm2_f;

            asm4 = ebx;
            ecx = ((ecx&0xffffff00)|(ebx&0xff));
            if (ebx >= 8) ecx = ((ecx&0xffffff00)|8);

            ebx = esi;
            edx = edi;
            while ((ecx&0xff))
            {
                    ebx >>= slopemach_ah2;
                    esi += ecx;
                    edx >>= slopemach_ah1;
                    ebx &= slopemach_edx;
                    edi += eax;
                    i1 += slopemach_ecx;
                    edx = ((edx&0xffffff00)|((((uint8_t  *)(ebx+edx))[slopemach_ebx])));
                    ebx = *((uint32_t*)i3); // register trickery
                    i3 -= 4;
                    eax = ((eax&0xffffff00)|(*((uint8_t  *)(ebx+edx))));
                    ebx = esi;

                        if (pixelsAllowed-- > 0)
                                *((uint8_t  *)i1) = (eax&0xff);

                    edx = edi;
                    ecx = ((ecx&0xffffff00)|((ecx-1)&0xff));


            }
            ebx = asm4;
            ebx -= 8;   // BITSOFPRECISIONPOW



    } while ((int32_t)ebx > 0);
}


/* END ---------------  FLOOR/CEILING RENDERING METHOD (USED TO BE HIGHLY OPTIMIZED ASSEMBLY) ----------------------------*/