project64/Source/Glide64/ucode07.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.
//
//****************************************************************
//
// Oct 2002 Created by Gonetz (Gonetz@ngs.ru)
// Info about this ucode is taken from TR64 OGL plugin. Thanks, Icepir8!
// Oct 2003 Modified by Gonetz (Gonetz@ngs.ru)
// Bugs fixed with help from glN64 sources. Thanks, Orkin!
//****************************************************************

uint32_t pd_col_addr = 0;

static void uc7_colorbase()
{
    WriteTrace(TraceRDP, TraceDebug, "uc7_colorbase");
    pd_col_addr = segoffset(rdp.cmd1);
}

typedef struct
{
    short y;
    short x;
    uint16_t idx;

    short z;

    short t;
    short s;
} vtx_uc7;

static void uc7_vertex()
{
    if (rdp.update & UPDATE_MULT_MAT)
    {
        rdp.update ^= UPDATE_MULT_MAT;
        MulMatrices(rdp.model, rdp.proj, rdp.combined);
    }

    // This is special, not handled in update()
    if (rdp.update & UPDATE_LIGHTS)
    {
        rdp.update ^= UPDATE_LIGHTS;

        // Calculate light vectors
        for (uint32_t l = 0; l < rdp.num_lights; l++)
        {
            InverseTransformVector(&rdp.light[l].dir_x, rdp.light_vector[l], rdp.model);
            NormalizeVector(rdp.light_vector[l]);
        }
    }

    uint32_t addr = segoffset(rdp.cmd1);
    uint32_t v0, i, n;
    float x, y, z;

    rdp.v0 = v0 = (rdp.cmd0 & 0x0F0000) >> 16;
    rdp.vn = n = ((rdp.cmd0 & 0xF00000) >> 20) + 1;

    WriteTrace(TraceRDP, TraceDebug, "uc7:vertex n: %d, v0: %d, from: %08lx", n, v0, addr);

    vtx_uc7 *vertex = (vtx_uc7 *)&gfx.RDRAM[addr];

    for (i = 0; i < n; i++)
    {
        VERTEX *v = &rdp.vtx[v0 + i];
        x = (float)vertex->x;
        y = (float)vertex->y;
        z = (float)vertex->z;
        v->flags = 0;
        v->ou = (float)vertex->s;
        v->ov = (float)vertex->t;
        v->uv_scaled = 0;

        WriteTrace(TraceRDP, TraceVerbose, "before: v%d - x: %f, y: %f, z: %f, flags: %04lx, ou: %f, ov: %f", i >> 4, x, y, z, v->flags, v->ou, v->ov);

        v->x = x*rdp.combined[0][0] + y*rdp.combined[1][0] + z*rdp.combined[2][0] + rdp.combined[3][0];
        v->y = x*rdp.combined[0][1] + y*rdp.combined[1][1] + z*rdp.combined[2][1] + rdp.combined[3][1];
        v->z = x*rdp.combined[0][2] + y*rdp.combined[1][2] + z*rdp.combined[2][2] + rdp.combined[3][2];
        v->w = x*rdp.combined[0][3] + y*rdp.combined[1][3] + z*rdp.combined[2][3] + rdp.combined[3][3];

        if (fabs(v->w) < 0.001) v->w = 0.001f;
        v->oow = 1.0f / v->w;
        v->x_w = v->x * v->oow;
        v->y_w = v->y * v->oow;
        v->z_w = v->z * v->oow;

        v->uv_calculated = 0xFFFFFFFF;
        v->screen_translated = 0;

        v->scr_off = 0;
        if (v->x < -v->w) v->scr_off |= 1;
        if (v->x > v->w) v->scr_off |= 2;
        if (v->y < -v->w) v->scr_off |= 4;
        if (v->y > v->w) v->scr_off |= 8;
        if (v->w < 0.1f) v->scr_off |= 16;

        uint8_t *color = &gfx.RDRAM[pd_col_addr + (vertex->idx & 0xff)];

        v->a = color[0];
        CalculateFog(v);

        if (rdp.geom_mode & 0x00020000)
        {
            v->vec[0] = (char)color[3];
            v->vec[1] = (char)color[2];
            v->vec[2] = (char)color[1];

            if (rdp.geom_mode & 0x80000)
            {
                calc_linear(v);
                WriteTrace(TraceRDP, TraceVerbose, "calc linear: v%d - u: %f, v: %f", i >> 4, v->ou, v->ov);
            }
            else if (rdp.geom_mode & 0x40000)
            {
                calc_sphere(v);
                WriteTrace(TraceRDP, TraceVerbose, "calc sphere: v%d - u: %f, v: %f", i >> 4, v->ou, v->ov);
            }

            NormalizeVector(v->vec);

            calc_light(v);
        }
        else
        {
            v->r = color[3];
            v->g = color[2];
            v->b = color[1];
        }
        WriteTrace(TraceRDP, TraceVerbose, "v%d - x: %f, y: %f, z: %f, w: %f, u: %f, v: %f", i >> 4, v->x, v->y, v->z, v->w, v->ou, v->ov);
        vertex++;
    }
}