/*
* 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.
//
//****************************************************************

int cur_mtx = 0;
int billboarding = 0;
int vtx_last = 0;
uint32_t dma_offset_mtx = 0;
uint32_t dma_offset_vtx = 0;

static void uc5_dma_offsets()
{
    dma_offset_mtx = rdp.cmd0 & 0x00FFFFFF;
    dma_offset_vtx = rdp.cmd1 & 0x00FFFFFF;
    vtx_last = 0;
    FRDP("uc5:dma_offsets - mtx: %08lx, vtx: %08lx\n", dma_offset_mtx, dma_offset_vtx);
}

static void uc5_matrix()
{
    // Use segment offset to get the address
    uint32_t addr = dma_offset_mtx + (segoffset(rdp.cmd1) & BMASK);

    uint8_t n = (uint8_t)((rdp.cmd0 >> 16) & 0xF);
    uint8_t multiply;

    if (n == 0) //DKR
    {
        n = (uint8_t)((rdp.cmd0 >> 22) & 0x3);
        multiply = 0;
    }
    else //JF
    {
        multiply = (uint8_t)((rdp.cmd0 >> 23) & 0x1);
    }

    cur_mtx = n;

    FRDP("uc5:matrix - #%d, addr: %08lx\n", n, addr);

    if (multiply)
    {
        DECLAREALIGN16VAR(m[4][4]);
        load_matrix(m, addr);
        DECLAREALIGN16VAR(m_src[4][4]);
        memcpy(m_src, rdp.dkrproj[0], 64);
        MulMatrices(m, m_src, rdp.dkrproj[n]);
    }
    else
    {
        load_matrix(rdp.dkrproj[n], addr);
    }
    rdp.update |= UPDATE_MULT_MAT;

#ifdef EXTREME_LOGGING
    FRDP ("{%f,%f,%f,%f}\n", rdp.dkrproj[n][0][0], rdp.dkrproj[n][0][1], rdp.dkrproj[n][0][2], rdp.dkrproj[n][0][3]);
    FRDP ("{%f,%f,%f,%f}\n", rdp.dkrproj[n][1][0], rdp.dkrproj[n][1][1], rdp.dkrproj[n][1][2], rdp.dkrproj[n][1][3]);
    FRDP ("{%f,%f,%f,%f}\n", rdp.dkrproj[n][2][0], rdp.dkrproj[n][2][1], rdp.dkrproj[n][2][2], rdp.dkrproj[n][2][3]);
    FRDP ("{%f,%f,%f,%f}\n", rdp.dkrproj[n][3][0], rdp.dkrproj[n][3][1], rdp.dkrproj[n][3][2], rdp.dkrproj[n][3][3]);

    for (int i=0; i<3; i++)
    {
        FRDP ("proj %d\n", i);
        FRDP ("{%f,%f,%f,%f}\n", rdp.dkrproj[i][0][0], rdp.dkrproj[i][0][1], rdp.dkrproj[i][0][2], rdp.dkrproj[i][0][3]);
        FRDP ("{%f,%f,%f,%f}\n", rdp.dkrproj[i][1][0], rdp.dkrproj[i][1][1], rdp.dkrproj[i][1][2], rdp.dkrproj[i][1][3]);
        FRDP ("{%f,%f,%f,%f}\n", rdp.dkrproj[i][2][0], rdp.dkrproj[i][2][1], rdp.dkrproj[i][2][2], rdp.dkrproj[i][2][3]);
        FRDP ("{%f,%f,%f,%f}\n", rdp.dkrproj[i][3][0], rdp.dkrproj[i][3][1], rdp.dkrproj[i][3][2], rdp.dkrproj[i][3][3]);
    }
#endif
}

static void uc5_vertex()
{
    uint32_t addr = dma_offset_vtx + (segoffset(rdp.cmd1) & BMASK);

    // | cccc cccc 1111 1??? 0000 0002 2222 2222 | cmd1 = address |
    // c = vtx command
    // 1 = method #1 of getting count
    // 2 = method #2 of getting count
    // ? = unknown, but used
    // 0 = unused

    int n = ((rdp.cmd0 >> 19) & 0x1F);// + 1;
    if (settings.hacks&hack_Diddy)
        n++;

    if (rdp.cmd0 & 0x00010000)
    {
        if (billboarding)
            vtx_last = 1;
    }
    else
        vtx_last = 0;

    int first = ((rdp.cmd0 >> 9) & 0x1F) + vtx_last;
    FRDP("uc5:vertex - addr: %08lx, first: %d, count: %d, matrix: %08lx\n", addr, first, n, cur_mtx);

    int prj = cur_mtx;

    int start = 0;
    float x, y, z;
    for (int i = first; i < first + n; i++)
    {
        start = (i - first) * 10;
        VERTEX *v = &rdp.vtx[i];
        x = (float)((short*)gfx.RDRAM)[(((addr + start) >> 1) + 0) ^ 1];
        y = (float)((short*)gfx.RDRAM)[(((addr + start) >> 1) + 1) ^ 1];
        z = (float)((short*)gfx.RDRAM)[(((addr + start) >> 1) + 2) ^ 1];

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

        if (billboarding)
        {
            v->x += rdp.vtx[0].x;
            v->y += rdp.vtx[0].y;
            v->z += rdp.vtx[0].z;
            v->w += rdp.vtx[0].w;
        }

        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->shade_mod = 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;
        if (fabs(v->z_w) > 1.0) v->scr_off |= 32;

        v->r = ((uint8_t*)gfx.RDRAM)[(addr + start + 6) ^ 3];
        v->g = ((uint8_t*)gfx.RDRAM)[(addr + start + 7) ^ 3];
        v->b = ((uint8_t*)gfx.RDRAM)[(addr + start + 8) ^ 3];
        v->a = ((uint8_t*)gfx.RDRAM)[(addr + start + 9) ^ 3];
        CalculateFog(v);

#ifdef EXTREME_LOGGING
        FRDP ("v%d - x: %f, y: %f, z: %f, w: %f, z_w: %f, r=%d, g=%d, b=%d, a=%d\n", i, v->x, v->y, v->z, v->w, v->z_w, v->r, v->g, v->b, v->a);
#endif
    }

    vtx_last += n;
}

static void uc5_tridma()
{
    vtx_last = 0;    // we've drawn something, so the vertex index needs resetting
    if (rdp.skip_drawing)
        return;

    // | cccc cccc 2222 0000 1111 1111 1111 0000 | cmd1 = address |
    // c = tridma command
    // 1 = method #1 of getting count
    // 2 = method #2 of getting count
    // 0 = unused

    uint32_t addr = segoffset(rdp.cmd1) & BMASK;
    int num = (rdp.cmd0 & 0xFFF0) >> 4;
    //int num = ((rdp.cmd0 & 0x00F00000) >> 20) + 1;  // same thing!
    FRDP("uc5:tridma #%d - addr: %08lx, count: %d\n", rdp.tri_n, addr, num);

    int start, v0, v1, v2, flags;
    for (int i = 0; i < num; i++)
    {
        start = i << 4;
        v0 = gfx.RDRAM[addr + start];
        v1 = gfx.RDRAM[addr + start + 1];
        v2 = gfx.RDRAM[addr + start + 2];

        FRDP("tri #%d - %d, %d, %d\n", rdp.tri_n, v0, v1, v2);

        VERTEX *v[3] = {
            &rdp.vtx[v0],
            &rdp.vtx[v1],
            &rdp.vtx[v2]
        };

        flags = gfx.RDRAM[addr + start + 3];

        if (flags & 0x40) { // no cull
            rdp.flags &= ~CULLMASK;
            grCullMode(GR_CULL_DISABLE);
        }
        else {        // front cull
            rdp.flags &= ~CULLMASK;
            if (rdp.view_scale[0] < 0) {
                rdp.flags |= CULL_BACK;   // agh, backwards culling
                grCullMode(GR_CULL_POSITIVE);
            }
            else {
                rdp.flags |= CULL_FRONT;
                grCullMode(GR_CULL_NEGATIVE);
            }
        }
        start += 4;

        v[0]->ou = (float)((short*)gfx.RDRAM)[((addr + start) >> 1) + 5] / 32.0f;
        v[0]->ov = (float)((short*)gfx.RDRAM)[((addr + start) >> 1) + 4] / 32.0f;
        v[1]->ou = (float)((short*)gfx.RDRAM)[((addr + start) >> 1) + 3] / 32.0f;
        v[1]->ov = (float)((short*)gfx.RDRAM)[((addr + start) >> 1) + 2] / 32.0f;
        v[2]->ou = (float)((short*)gfx.RDRAM)[((addr + start) >> 1) + 1] / 32.0f;
        v[2]->ov = (float)((short*)gfx.RDRAM)[((addr + start) >> 1) + 0] / 32.0f;

        v[0]->uv_calculated = 0xFFFFFFFF;
        v[1]->uv_calculated = 0xFFFFFFFF;
        v[2]->uv_calculated = 0xFFFFFFFF;

        if (cull_tri(v))
            rdp.tri_n++;
        else
        {
            update();

            draw_tri(v);
            rdp.tri_n++;
        }
    }
}

static void uc5_dl_in_mem()
{
    uint32_t addr = segoffset(rdp.cmd1) & BMASK;
    int count = (rdp.cmd0 & 0x00FF0000) >> 16;
    FRDP("uc5:dl_in_mem - addr: %08lx, count: %d\n", addr, count);

    if (rdp.pc_i >= 9) {
        RDP_E("** DL stack overflow **\n");
        LRDP("** DL stack overflow **\n");
        return;
    }
    rdp.pc_i++;  // go to the next PC in the stack
    rdp.pc[rdp.pc_i] = addr;  // jump to the address
    rdp.dl_count = count + 1;
}

static void uc5_moveword()
{
    LRDP("uc5:moveword ");

    // Find which command this is (lowest byte of cmd0)
    switch (rdp.cmd0 & 0xFF)
    {
    case 0x02:  // moveword matrix 2 billboard
        billboarding = (rdp.cmd1 & 1);
        FRDP("matrix billboard - %s\n", str_offon[billboarding]);
        break;

    case 0x04:  // clip (verified same)
        if (((rdp.cmd0 >> 8) & 0xFFFF) == 0x04)
        {
            rdp.clip_ratio = sqrt((float)rdp.cmd1);
            rdp.update |= UPDATE_VIEWPORT;
        }
        FRDP("clip %08lx, %08lx\n", rdp.cmd0, rdp.cmd1);
        break;

    case 0x06:  // segment (verified same)
        FRDP("segment: %08lx -> seg%d\n", rdp.cmd1, (rdp.cmd0 >> 10) & 0x0F);
        rdp.segment[(rdp.cmd0 >> 10) & 0x0F] = rdp.cmd1;
        break;

    case 0x08:
    {
        rdp.fog_multiplier = (short)(rdp.cmd1 >> 16);
        rdp.fog_offset = (short)(rdp.cmd1 & 0x0000FFFF);
        FRDP("fog: multiplier: %f, offset: %f\n", rdp.fog_multiplier, rdp.fog_offset);
        //	  rdp.update |= UPDATE_FOG_ENABLED;
    }
    break;

    case 0x0a:  // moveword matrix select
        cur_mtx = (rdp.cmd1 >> 6) & 3;
        FRDP("matrix select - mtx: %d\n", cur_mtx);
        break;

    default:
        FRDP("(unknown) %02lx - IGNORED\n", rdp.cmd0 & 0xFF);
    }
}

static void uc5_setgeometrymode()
{
    FRDP("uc0:setgeometrymode %08lx\n", rdp.cmd1);

    rdp.geom_mode |= rdp.cmd1;

    if (rdp.cmd1 & 0x00000001)  // Z-Buffer enable
    {
        if (!(rdp.flags & ZBUF_ENABLED))
        {
            rdp.flags |= ZBUF_ENABLED;
            rdp.update |= UPDATE_ZBUF_ENABLED;
        }
    }

    //Added by Gonetz
    if (rdp.cmd1 & 0x00010000)      // Fog enable
    {
        if (!(rdp.flags & FOG_ENABLED))
        {
            rdp.flags |= FOG_ENABLED;
            rdp.update |= UPDATE_FOG_ENABLED;
        }
    }
}

static void uc5_cleargeometrymode()
{
    FRDP("uc0:cleargeometrymode %08lx\n", rdp.cmd1);

    rdp.geom_mode &= (~rdp.cmd1);

    if (rdp.cmd1 & 0x00000001)  // Z-Buffer enable
    {
        if (rdp.flags & ZBUF_ENABLED)
        {
            rdp.flags ^= ZBUF_ENABLED;
            rdp.update |= UPDATE_ZBUF_ENABLED;
        }
    }
    //Added by Gonetz
    if (rdp.cmd1 & 0x00010000)      // Fog enable
    {
        if (rdp.flags & FOG_ENABLED)
        {
            rdp.flags ^= FOG_ENABLED;
            rdp.update |= UPDATE_FOG_ENABLED;
        }
    }
}