project64/Source/Glide64/Util.h

/*
* Glide64 - Glide video plugin for Nintendo 64 emulators.
* Copyright (c) 2002  Dave2001
* Copyright (c) 2003-2009  Sergey 'Gonetz' Lipski
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

//****************************************************************
//
// Glide64 - Glide Plugin for Nintendo 64 emulators
// Project started on December 29th, 2001
//
// Authors:
// Dave2001, original author, founded the project in 2001, left it in 2002
// Gugaman, joined the project in 2002, left it in 2002
// Sergey 'Gonetz' Lipski, joined the project in 2002, main author since fall of 2002
// Hiroshi 'KoolSmoky' Morii, joined the project in 2007
//
//****************************************************************
//
// To modify Glide64:
// * Write your name and (optional)email, commented by your work, so I know who did it, and so that you can find which parts you modified when it comes time to send it to me.
// * Do NOT send me the whole project or file that you modified.  Take out your modified code sections, and tell me where to put them.  If people sent the whole thing, I would have many different versions, but no idea how to combine them all.
//
//****************************************************************

#ifndef Util_H
#define Util_H

#define NOT_TMU0	0x00
#define NOT_TMU1	0x01
#define NOT_TMU2	0x02

void util_init();

int cull_tri(VERTEX **v);
void draw_tri(VERTEX **v, uint16_t linew = 0);
void do_triangle_stuff(uint16_t linew = 0, int old_interpolate = TRUE);
void do_triangle_stuff_2(uint16_t linew = 0);
void apply_shade_mods(VERTEX *v);

void update();
void update_scissor();

void set_message_combiner();

float ScaleZ(float z);

// positional and texel coordinate clipping
#define CCLIP(ux,lx,ut,lt,uc,lc) \
		if (ux > lx || lx < uc || ux > lc) { rdp.tri_n += 2; return; } \
		if (ux < uc) { \
			float p = (uc-ux)/(lx-ux); \
			ut = p*(lt-ut)+ut; \
			ux = uc; \
                		} \
		if (lx > lc) { \
			float p = (lc-ux)/(lx-ux); \
			lt = p*(lt-ut)+ut; \
			lx = lc; \
                		}

#define CCLIP2(ux,lx,ut,lt,un,ln,uc,lc) \
		if (ux > lx || lx < uc || ux > lc) { rdp.tri_n += 2; return; } \
		if (ux < uc) { \
			float p = (uc-ux)/(lx-ux); \
			ut = p*(lt-ut)+ut; \
			un = p*(ln-un)+un; \
			ux = uc; \
                		} \
		if (lx > lc) { \
			float p = (lc-ux)/(lx-ux); \
			lt = p*(lt-ut)+ut; \
			ln = p*(ln-un)+un; \
			lx = lc; \
                		}

#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
#include <stdlib.h>
#define bswap32(x) _byteswap_ulong(x)
#else
static inline uint32_t bswap32(uint32_t val)
{
    return (((val & 0xff000000) >> 24) |
        ((val & 0x00ff0000) >>  8) |
        ((val & 0x0000ff00) <<  8) |
        ((val & 0x000000ff) << 24));
}
#endif

#define ALOWORD(x)   (*((uint16_t*)&(x)))   // low word

static inline uint16_t __ROR__(uint16_t value, unsigned int count)
{
    const unsigned int nbits = sizeof(uint16_t) * 8;
    count %= nbits;

    uint16_t low = (value << (nbits - count)) & 0xFFFF;
    value >>= count;
    value |= low;
    return value;
}

template<class T> static inline T __ROR__(T value, unsigned int count)
{
    const unsigned int nbits = sizeof(T) * 8;
    count %= nbits;

    T low = value << (nbits - count);
    value >>= count;
    value |= low;
    return value;
}

// rotate left
template<class T> static T __ROL__(T value, unsigned int count)
{
    const unsigned int nbits = sizeof(T) * 8;
    count %= nbits;

    T high = value >> (nbits - count);
    value <<= count;
    value |= high;
    return value;
}

#endif  // ifndef Util_H