86Box/src/video/vid_svga_render.c

/*
 * 86Box	A hypervisor and IBM PC system emulator that specializes in
 *		running old operating systems and software designed for IBM
 *		PC systems and compatibles from 1981 through fairly recent
 *		system designs based on the PCI bus.
 *
 *		This file is part of the 86Box distribution.
 *
 *		SVGA renderers.
 *
 * Version:	@(#)vid_svga_render.c	1.0.11	2018/05/26
 *
 * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
 *		Miran Grca, <mgrca8@gmail.com>
 *
 *		Copyright 2008-2018 Sarah Walker.
 *		Copyright 2016-2018 Miran Grca.
 */
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <wchar.h>
#include "../86box.h"
#include "../mem.h"
#include "video.h"
#include "vid_svga.h"
#include "vid_svga_render.h"


void svga_render_blank(svga_t *svga)
{
        int x, xx;
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->firstline_draw == 2000) 
                svga->firstline_draw = svga->displine;
        svga->lastline_draw = svga->displine;
        
        for (x = 0; x < svga->hdisp; x++)
        {
                switch (svga->seqregs[1] & 9)
                {
                        case 0:
                        for (xx = 0; xx < 9; xx++) ((uint32_t *)buffer32->line[svga->displine + y_add])[(x * 9) + xx + 32 + x_add] = 0;
                        break;
                        case 1:
                        for (xx = 0; xx < 8; xx++) ((uint32_t *)buffer32->line[svga->displine + y_add])[(x * 8) + xx + 32 + x_add] = 0;
                        break;
                        case 8:
                        for (xx = 0; xx < 18; xx++) ((uint32_t *)buffer32->line[svga->displine + y_add])[(x * 18) + xx + 32 + x_add] = 0;
                        break;
                        case 9:
                        for (xx = 0; xx < 16; xx++) ((uint32_t *)buffer32->line[svga->displine + y_add])[(x * 16) + xx + 32 + x_add] = 0;
                        break;
                }
        }
}

void svga_render_text_40(svga_t *svga)
{     
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->firstline_draw == 2000) 
                svga->firstline_draw = svga->displine;
        svga->lastline_draw = svga->displine;
        
        if (svga->fullchange)
        {
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[32 + x_add];
                int x, xx;
                int drawcursor;
                uint8_t chr, attr, dat;
                uint32_t charaddr;
                int fg, bg;
                int xinc = (svga->seqregs[1] & 1) ? 16 : 18;
                
                for (x = 0; x < svga->hdisp; x += xinc)
                {
                        drawcursor = ((svga->ma == svga->ca) && svga->con && svga->cursoron);
                        chr  = svga->vram[(svga->ma << 1) & svga->vram_display_mask];
                        attr = svga->vram[((svga->ma << 1) + 1) & svga->vram_display_mask];
                        if (attr & 8) charaddr = svga->charsetb + (chr * 128);
                        else          charaddr = svga->charseta + (chr * 128);

                        if (drawcursor) 
                        { 
                                bg = svga->pallook[svga->egapal[attr & 15]]; 
                                fg = svga->pallook[svga->egapal[attr >> 4]]; 
                        }
                        else
                        {
                                fg = svga->pallook[svga->egapal[attr & 15]];
                                bg = svga->pallook[svga->egapal[attr >> 4]];
                                if (attr & 0x80 && svga->attrregs[0x10] & 8)
                                {
                                        bg = svga->pallook[svga->egapal[(attr >> 4) & 7]];
                                        if (svga->blink & 16) 
                                                fg = bg;
                                }
                        }

                        dat = svga->vram[charaddr + (svga->sc << 2)];
                        if (svga->seqregs[1] & 1) 
                        { 
                                for (xx = 0; xx < 16; xx += 2) 
                                        p[xx] = p[xx + 1] = (dat & (0x80 >> (xx >> 1))) ? fg : bg;
                        }
                        else
                        {
                                for (xx = 0; xx < 16; xx += 2)
                                        p[xx] = p[xx + 1] = (dat & (0x80 >> (xx >> 1))) ? fg : bg;
                                if ((chr & ~0x1F) != 0xC0 || !(svga->attrregs[0x10] & 4)) 
                                        p[16] = p[17] = bg;
                                else                  
                                        p[16] = p[17] = (dat & 1) ? fg : bg;
                        }
                        svga->ma += 4; 
                        p += xinc;
                }
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_text_80(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->firstline_draw == 2000) 
                svga->firstline_draw = svga->displine;
        svga->lastline_draw = svga->displine;
        
        if (svga->fullchange)
        {
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[32 + x_add];
                int x, xx;
                int drawcursor;
                uint8_t chr, attr, dat;
                uint32_t charaddr;
                int fg, bg;
                int xinc = (svga->seqregs[1] & 1) ? 8 : 9;

                for (x = 0; x < svga->hdisp; x += xinc)
                {
                        drawcursor = ((svga->ma == svga->ca) && svga->con && svga->cursoron);
                        chr  = svga->vram[(svga->ma << 1) & svga->vram_display_mask];
                        attr = svga->vram[((svga->ma << 1) + 1) & svga->vram_display_mask];


                        if (attr & 8) charaddr = svga->charsetb + (chr * 128);
                        else          charaddr = svga->charseta + (chr * 128);

                        if (drawcursor) 
                        { 
                                bg = svga->pallook[svga->egapal[attr & 15]]; 
                                fg = svga->pallook[svga->egapal[attr >> 4]]; 
                        }
                        else
                        {
                                fg = svga->pallook[svga->egapal[attr & 15]];
                                bg = svga->pallook[svga->egapal[attr >> 4]];
                                if (attr & 0x80 && svga->attrregs[0x10] & 8)
                                {
                                        bg = svga->pallook[svga->egapal[(attr >> 4) & 7]];
                                        if (svga->blink & 16) 
                                                fg = bg;
                                }
                        }

                        dat = svga->vram[charaddr + (svga->sc << 2)];
                        if (svga->seqregs[1] & 1) 
                        { 
                                for (xx = 0; xx < 8; xx++) 
                                        p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
                        }
                        else
                        {
                                for (xx = 0; xx < 8; xx++) 
                                        p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
                                if ((chr & ~0x1F) != 0xC0 || !(svga->attrregs[0x10] & 4)) 
                                        p[8] = bg;
                                else                  
                                        p[8] = (dat & 1) ? fg : bg;
                        }
                        svga->ma += 4; 
                        p += xinc;
                }
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_text_80_ksc5601(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->firstline_draw == 2000) 
                svga->firstline_draw = svga->displine;
        svga->lastline_draw = svga->displine;
        
        if (svga->fullchange)
        {
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[32 + x_add];
                int x, xx;
                int drawcursor;
                uint8_t chr, attr, dat, nextchr;
                uint32_t charaddr;
                int fg, bg;
                int xinc = (svga->seqregs[1] & 1) ? 8 : 9;

                for (x = 0; x < svga->hdisp; x += xinc)
                {
                        drawcursor = ((svga->ma == svga->ca) && svga->con && svga->cursoron);
                        chr  = svga->vram[(svga->ma << 1) & svga->vram_display_mask];
			nextchr = svga->vram[((svga->ma + 4) << 1) & svga->vram_display_mask];
                        attr = svga->vram[((svga->ma << 1) + 1) & svga->vram_display_mask];


                        if (drawcursor) 
                        { 
                                bg = svga->pallook[svga->egapal[attr & 15]]; 
                                fg = svga->pallook[svga->egapal[attr >> 4]]; 
                        }
                        else
                        {
                                fg = svga->pallook[svga->egapal[attr & 15]];
                                bg = svga->pallook[svga->egapal[attr >> 4]];
                                if (attr & 0x80 && svga->attrregs[0x10] & 8)
                                {
                                        bg = svga->pallook[svga->egapal[(attr >> 4) & 7]];
                                        if (svga->blink & 16) 
                                                fg = bg;
                                }
                        }

                        if(x + xinc < svga->hdisp && (chr & nextchr & 0x80))
                        {
                                if((chr == 0xc9 || chr == 0xfe) && (nextchr > 0xa0 && nextchr < 0xff))
                                        dat = fontdatksc5601_user[(chr == 0xfe ? 96 : 0) + (nextchr & 0x7F) - 0x20].chr[svga->sc];
                                else
                                        dat = fontdatksc5601[((chr & 0x7F) << 7) | (nextchr & 0x7F)].chr[svga->sc];
                        }
                        else
                        {
                                if (attr & 8) charaddr = svga->charsetb + (chr * 128);
                                else          charaddr = svga->charseta + (chr * 128);
 
                                dat = svga->vram[charaddr + (svga->sc << 2)];
                        }
                        if (svga->seqregs[1] & 1) 
                        { 
                                for (xx = 0; xx < 8; xx++) 
                                        p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
                        }
                        else
                        {
                                for (xx = 0; xx < 8; xx++) 
                                        p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
                                if ((chr & ~0x1F) != 0xC0 || !(svga->attrregs[0x10] & 4)) 
                                        p[8] = bg;
                                else                  
                                        p[8] = (dat & 1) ? fg : bg;
                        }
                        svga->ma += 4; 
                        p += xinc;

                        if(x + xinc < svga->hdisp && (chr & nextchr & 0x80))
                        {
                                attr = svga->vram[((svga->ma << 1) + 1) & svga->vram_display_mask];

                                if (drawcursor) 
                                { 
                                        bg = svga->pallook[svga->egapal[attr & 15]]; 
                                        fg = svga->pallook[svga->egapal[attr >> 4]]; 
                                }
                                else
                                {
                                        fg = svga->pallook[svga->egapal[attr & 15]];
                                        bg = svga->pallook[svga->egapal[attr >> 4]];
                                        if (attr & 0x80 && svga->attrregs[0x10] & 8)
                                        {
                                                bg = svga->pallook[svga->egapal[(attr >> 4) & 7]];
                                                if (svga->blink & 16) 
                                                        fg = bg;
                                        }
                                }

                                if((chr == 0xc9 || chr == 0xfe) && (nextchr > 0xa0 && nextchr < 0xff))
                                        dat = fontdatksc5601_user[(chr == 0xfe ? 96 : 0) + (nextchr & 0x7F) - 0x20].chr[svga->sc + 16];
                                else
                                        dat = fontdatksc5601[((chr & 0x7F) << 7) | (nextchr & 0x7F)].chr[svga->sc + 16];
                                if (svga->seqregs[1] & 1) 
                                { 
                                        for (xx = 0; xx < 8; xx++) 
                                                p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
                                }
                                else
                                {
                                        for (xx = 0; xx < 8; xx++) 
                                                p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
                                        if ((chr & ~0x1F) != 0xC0 || !(svga->attrregs[0x10] & 4)) 
                                                p[8] = bg;
                                        else                  
                                                p[8] = (dat & 1) ? fg : bg;
                                }

                                svga->ma += 4; 
                                p += xinc;
                                x += xinc;
                        }
                }
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_2bpp_lowres(svga_t *svga)
{
        int changed_offset;
        
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

	changed_offset = ((svga->ma << 1) + (svga->sc & ~svga->crtc[0x17] & 3) * 0x8000) >> 12;
                
        if (svga->changedvram[changed_offset] || svga->changedvram[changed_offset + 1] || svga->fullchange)
        {
                int x;
                int offset = ((8 - svga->scrollcache) << 1) + 16;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];
                
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;
                       
                for (x = 0; x <= svga->hdisp; x += 16)
                {
                        uint8_t dat[2];
                        
                        dat[0] = svga->vram[(svga->ma << 1) + ((svga->sc & ~svga->crtc[0x17] & 3)) * 0x8000];
                        dat[1] = svga->vram[(svga->ma << 1) + ((svga->sc & ~svga->crtc[0x17] & 3)) * 0x8000 + 1];
                        svga->ma += 4; 
                        svga->ma &= svga->vram_display_mask;

                        p[0]  = p[1]  = svga->pallook[svga->egapal[(dat[0] >> 6) & 3]];
                        p[2]  = p[3]  = svga->pallook[svga->egapal[(dat[0] >> 4) & 3]];
                        p[4]  = p[5]  = svga->pallook[svga->egapal[(dat[0] >> 2) & 3]];
                        p[6]  = p[7]  = svga->pallook[svga->egapal[dat[0] & 3]];
                        p[8]  = p[9]  = svga->pallook[svga->egapal[(dat[1] >> 6) & 3]];
                        p[10] = p[11] = svga->pallook[svga->egapal[(dat[1] >> 4) & 3]];
                        p[12] = p[13] = svga->pallook[svga->egapal[(dat[1] >> 2) & 3]];
                        p[14] = p[15] = svga->pallook[svga->egapal[dat[1] & 3]];

                        p += 16;
                }
        }
}

void svga_render_2bpp_highres(svga_t *svga)
{
        int changed_offset;
        
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

	changed_offset = ((svga->ma << 1) + (svga->sc & ~svga->crtc[0x17] & 3) * 0x8000) >> 12;
                                
        if (svga->changedvram[changed_offset] || svga->changedvram[changed_offset + 1] || svga->fullchange)
        {
                int x;
                int offset = (8 - svga->scrollcache) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];
                
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;
                       
                for (x = 0; x <= svga->hdisp; x += 8)
                {
                        uint8_t dat[2];
                        
                        dat[0] = svga->vram[(svga->ma << 1) + ((svga->sc & ~svga->crtc[0x17] & 3)) * 0x8000];
                        dat[1] = svga->vram[(svga->ma << 1) + ((svga->sc & ~svga->crtc[0x17] & 3)) * 0x8000 + 1];
                        svga->ma += 4; 
                        svga->ma &= svga->vram_display_mask;

                        p[0] = svga->pallook[svga->egapal[(dat[0] >> 6) & 3]];
                        p[1] = svga->pallook[svga->egapal[(dat[0] >> 4) & 3]];
                        p[2] = svga->pallook[svga->egapal[(dat[0] >> 2) & 3]];
                        p[3] = svga->pallook[svga->egapal[dat[0] & 3]];
                        p[4] = svga->pallook[svga->egapal[(dat[1] >> 6) & 3]];
                        p[5] = svga->pallook[svga->egapal[(dat[1] >> 4) & 3]];
                        p[6] = svga->pallook[svga->egapal[(dat[1] >> 2) & 3]];
                        p[7] = svga->pallook[svga->egapal[dat[1] & 3]];
                        
                        p += 8;
                }
        }
}

void svga_render_4bpp_lowres(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
        {
                int x;
                int offset = ((8 - svga->scrollcache) << 1) + 16;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];
                
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;

                for (x = 0; x <= svga->hdisp; x += 16)
                {
                        uint8_t edat[4];
                        uint8_t dat;

                        *(uint32_t *)(&edat[0]) = *(uint32_t *)(&svga->vram[svga->ma]);                        
                        svga->ma += 4; 
                        svga->ma &= svga->vram_display_mask;

                        dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2);
                        p[0]  = p[1]  = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
                        p[2]  = p[3]  = svga->pallook[svga->egapal[dat & svga->plane_mask]];
                        dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2);
                        p[4]  = p[5]  = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
                        p[6]  = p[7]  = svga->pallook[svga->egapal[dat & svga->plane_mask]];
                        dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2);
                        p[8]  = p[9]  = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
                        p[10] = p[11] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
                        dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2);
                        p[12] = p[13] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
                        p[14] = p[15] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
                                                
                        p += 16;
                }
        }
}

void svga_render_4bpp_highres(svga_t *svga)
{
        int changed_offset;
        
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

	changed_offset = (svga->ma + (svga->sc & ~svga->crtc[0x17] & 3) * 0x8000) >> 12;
                
        if (svga->changedvram[changed_offset] || svga->changedvram[changed_offset + 1] || svga->fullchange)
        {
                int x;
                int offset = (8 - svga->scrollcache) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];
        
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;
                
                for (x = 0; x <= svga->hdisp; x += 8)
                {
                        uint8_t edat[4];
                        uint8_t dat;

			*(uint32_t *)(&edat[0]) = *(uint32_t *)(&svga->vram[svga->ma | ((svga->sc & ~svga->crtc[0x17] & 3)) * 0x8000]);
                        svga->ma += 4;
                        svga->ma &= svga->vram_display_mask;

                        dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2);
                        p[0] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
                        p[1] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
                        dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2);
                        p[2] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
                        p[3] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
                        dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2);
                        p[4] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
                        p[5] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
                        dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2);
                        p[6] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
                        p[7] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
                        
                        p += 8;
                }
        }
}

void svga_render_8bpp_lowres(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
        {
                int x;
                int offset = (8 - (svga->scrollcache & 6)) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];
                
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;
                                                                
                for (x = 0; x <= svga->hdisp; x += 8)
                {
                        uint32_t dat = *(uint32_t *)(&svga->vram[svga->ma & svga->vram_display_mask]);
                        
                        p[0] = p[1] = svga->pallook[dat & 0xff];
                        p[2] = p[3] = svga->pallook[(dat >> 8) & 0xff];
                        p[4] = p[5] = svga->pallook[(dat >> 16) & 0xff];
                        p[6] = p[7] = svga->pallook[(dat >> 24) & 0xff];
                        
                        svga->ma += 4;
                        p += 8;
                }
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_8bpp_highres(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
        {
                int x;
                int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];

                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;
                                                                
                for (x = 0; x <= svga->hdisp; x += 8)
                {
                        uint32_t dat;
                        dat = *(uint32_t *)(&svga->vram[svga->ma & svga->vram_display_mask]);
                        p[0] = svga->pallook[dat & 0xff];
                        p[1] = svga->pallook[(dat >> 8) & 0xff];
                        p[2] = svga->pallook[(dat >> 16) & 0xff];
                        p[3] = svga->pallook[(dat >> 24) & 0xff];

                        dat = *(uint32_t *)(&svga->vram[(svga->ma + 4) & svga->vram_display_mask]);
                        p[4] = svga->pallook[dat & 0xff];
                        p[5] = svga->pallook[(dat >> 8) & 0xff];
                        p[6] = svga->pallook[(dat >> 16) & 0xff];
                        p[7] = svga->pallook[(dat >> 24) & 0xff];
                        
                        svga->ma += 8;
                        p += 8;
                }
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_15bpp_lowres(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
        {
                int x;
                int offset = (8 - (svga->scrollcache & 6)) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];
                
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;
               
                for (x = 0; x <= svga->hdisp; x += 4)
                {
                        uint32_t dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);

                        p[x]     = video_15to32[dat & 0xffff];
                        p[x + 1] = video_15to32[dat >> 16];

                        dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);

                        p[x]     = video_15to32[dat & 0xffff];
                        p[x + 1] = video_15to32[dat >> 16];
                }
                svga->ma += x << 1; 
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_15bpp_highres(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
        {
                int x;
                int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];

                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;

                for (x = 0; x <= svga->hdisp; x += 8)
                {
                        uint32_t dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
                        p[x]     = video_15to32[dat & 0xffff];
                        p[x + 1] = video_15to32[dat >> 16];
                        
                        dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
                        p[x + 2] = video_15to32[dat & 0xffff];
                        p[x + 3] = video_15to32[dat >> 16];

                        dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 8) & svga->vram_display_mask]);
                        p[x + 4] = video_15to32[dat & 0xffff];
                        p[x + 5] = video_15to32[dat >> 16];

                        dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 12) & svga->vram_display_mask]);
                        p[x + 6] = video_15to32[dat & 0xffff];
                        p[x + 7] = video_15to32[dat >> 16];
                }
                svga->ma += x << 1; 
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_16bpp_lowres(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
        {
                int x;
                int offset = (8 - (svga->scrollcache & 6)) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];
                
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;
               
                for (x = 0; x <= svga->hdisp; x += 4)
                {
                        uint32_t dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);

                        p[x]     = video_16to32[dat & 0xffff];
                        p[x + 1] = video_16to32[dat >> 16];

                        dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);

                        p[x]     = video_16to32[dat & 0xffff];
                        p[x + 1] = video_16to32[dat >> 16];
                }
                svga->ma += x << 1; 
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_16bpp_highres(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
        {
                int x;
                int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];

                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;

                for (x = 0; x <= svga->hdisp; x += 8)
                {
                        uint32_t dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
                        p[x]     = video_16to32[dat & 0xffff];
                        p[x + 1] = video_16to32[dat >> 16];
                        
                        dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
                        p[x + 2] = video_16to32[dat & 0xffff];
                        p[x + 3] = video_16to32[dat >> 16];

                        dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 8) & svga->vram_display_mask]);
                        p[x + 4] = video_16to32[dat & 0xffff];
                        p[x + 5] = video_16to32[dat >> 16];

                        dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 12) & svga->vram_display_mask]);
                        p[x + 6] = video_16to32[dat & 0xffff];
                        p[x + 7] = video_16to32[dat >> 16];
                }
                svga->ma += x << 1; 
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_24bpp_lowres(svga_t *svga)
{
        int x, offset;
        uint32_t fg;
        
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
        {
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;

                offset = (8 - (svga->scrollcache & 6)) + 24;

                for (x = 0; x <= svga->hdisp; x++)
                {
                        fg = svga->vram[svga->ma] | (svga->vram[svga->ma + 1] << 8) | (svga->vram[svga->ma + 2] << 16);
                        svga->ma += 3; 
                        svga->ma &= svga->vram_display_mask;
                        ((uint32_t *)buffer32->line[svga->displine + y_add])[(x << 1) + offset + x_add] = ((uint32_t *)buffer32->line[svga->displine + y_add])[(x << 1) + 1 + offset + x_add] = fg;
                }
        }
}

void svga_render_24bpp_highres(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
        {
                int x;
                int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];
                
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;

                for (x = 0; x <= svga->hdisp; x += 4)
                {
                        uint32_t dat = *(uint32_t *)(&svga->vram[svga->ma & svga->vram_display_mask]);
                        p[x] = dat & 0xffffff;
                        
                        dat = *(uint32_t *)(&svga->vram[(svga->ma + 3) & svga->vram_display_mask]);
                        p[x + 1] = dat & 0xffffff;
                        
                        dat = *(uint32_t *)(&svga->vram[(svga->ma + 6) & svga->vram_display_mask]);
                        p[x + 2] = dat & 0xffffff;
                        
                        dat = *(uint32_t *)(&svga->vram[(svga->ma + 9) & svga->vram_display_mask]);
                        p[x + 3] = dat & 0xffffff;
                        
                        svga->ma += 12;
                }
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_32bpp_lowres(svga_t *svga)
{
        int x, offset;
        uint32_t fg;
        
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
        {
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;

                offset = (8 - (svga->scrollcache & 6)) + 24;

                for (x = 0; x <= svga->hdisp; x++)
                {
                        fg = svga->vram[svga->ma] | (svga->vram[svga->ma + 1] << 8) | (svga->vram[svga->ma + 2] << 16);
                        svga->ma += 4; 
                        svga->ma &= svga->vram_display_mask;
                        ((uint32_t *)buffer32->line[svga->displine + y_add])[(x << 1) + offset + x_add] = ((uint32_t *)buffer32->line[svga->displine + y_add])[(x << 1) + 1 + offset + x_add] = fg;
                }
        }
}

/*72%
  91%*/
void svga_render_32bpp_highres(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] ||  svga->changedvram[(svga->ma >> 12) + 1] || svga->changedvram[(svga->ma >> 12) + 2] || svga->fullchange)
        {
                int x;
                int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];
                
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;

                for (x = 0; x <= svga->hdisp; x++)
                {
                        uint32_t dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 2)) & svga->vram_display_mask]);
                        p[x] = dat & 0xffffff;
                }
                svga->ma += 4; 
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_ABGR8888_highres(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] ||  svga->changedvram[(svga->ma >> 12) + 1] || svga->changedvram[(svga->ma >> 12) + 2] || svga->fullchange)
        {
                int x;
                int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];
                
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;

                for (x = 0; x <= svga->hdisp; x++)
                {
                        uint32_t dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 2)) & svga->vram_display_mask]);
                        p[x] = ((dat & 0xff0000) >> 16) | (dat & 0x00ff00) | ((dat & 0x0000ff) << 16);
                }
                svga->ma += 4; 
                svga->ma &= svga->vram_display_mask;
        }
}

void svga_render_RGBA8888_highres(svga_t *svga)
{
	int y_add = enable_overscan ? (overscan_y >> 1) : 0;
	int x_add = enable_overscan ? 8 : 0;

        if (svga->changedvram[svga->ma >> 12] ||  svga->changedvram[(svga->ma >> 12) + 1] || svga->changedvram[(svga->ma >> 12) + 2] || svga->fullchange)
        {
                int x;
                int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
                uint32_t *p = &((uint32_t *)buffer32->line[svga->displine + y_add])[offset + x_add];
                
                if (svga->firstline_draw == 2000) 
                        svga->firstline_draw = svga->displine;
                svga->lastline_draw = svga->displine;

                for (x = 0; x <= svga->hdisp; x++)
                {
                        uint32_t dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 2)) & svga->vram_display_mask]);
                        p[x] = dat >> 8;
                }
                svga->ma += 4; 
                svga->ma &= svga->vram_display_mask;
        }
}