/*  Starshatter OpenSource Distribution
    Copyright (c) 1997-2004, Destroyer Studios LLC.
    All Rights Reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name "Destroyer Studios" nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

    SUBSYSTEM:    Magic.exe
    FILE:         ModelFile3DS.cpp
    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    File loader for 3DStudio MAX 3DS format models
*/

#include "stdafx.h"
#include "Magic.h"
#include "MagicDoc.h"
#include "ModelFile3DS.h"

#include "Bitmap.h"
#include "Polygon.h"
#include "Text.h"
#include "List.h"
#include "l3ds.h"

// +--------------------------------------------------------------------+

ModelFile3DS::ModelFile3DS(const char* fname)
   : ModelFile(fname)
{
}

ModelFile3DS::~ModelFile3DS()
{
}

// +--------------------------------------------------------------------+

static int mcomp(const void* a, const void* b)
{
   Poly* pa = (Poly*) a;
   Poly* pb = (Poly*) b;

   if (pa->sortval == pb->sortval)
      return 0;

   if (pa->sortval < pb->sortval)
      return 1;

   return -1;
}

bool
ModelFile3DS::Load(Model* model, double scale)
{
   if (model && scale > 0 && strlen(filename) > 0) {
      ModelFile::Load(model, scale);

      L3DS loader;

      if (!loader.LoadFile(filename)) {
         ::MessageBox(0, "3DS Import Failed: Magic could not open the file for reading", "ERROR", MB_OK);
         return false;
      }

      int ntex   = 0;
      int nsurfs = 0;
      int nverts = 0;
      int npolys = 0;
      int nmatls = 0;
      int nmeshs = loader.GetMeshCount();

      int*   mesh_verts = new int[nmeshs];

      for (int m = 0; m < nmeshs; m++) {
         LMesh& mesh = loader.GetMesh(m);

         mesh_verts[m] = nverts;

         // count verts and polys:
         nverts += mesh.GetVertexCount();
         npolys += mesh.GetTriangleCount();
      }

      if (nverts > Model::MAX_VERTS || npolys > Model::MAX_POLYS) {
         ::MessageBox(0, "3DS Import Failed:  model was too large (max 16000 polys)", "ERROR", MB_OK);
         delete [] mesh_verts;
         return FALSE;
      }

      // get materials:
      nmatls = loader.GetMaterialCount();

      for (int i = 0; i < nmatls; i++) {
         LMaterial& matl      = loader.GetMaterial(i);
         LMap&      tex_diff  = matl.GetTextureMap1();
         LMap&      tex_spec  = matl.GetSpecularMap();
         LMap&      tex_bump  = matl.GetBumpMap();
         LMap&      tex_glow  = matl.GetTextureMap2();

         Material*  material  = new Material;

         strncpy(material->name, matl.GetName().c_str(), Material::NAMELEN);

         material->Ka.Set( matl.GetAmbientColor().r,
                           matl.GetAmbientColor().g,
                           matl.GetAmbientColor().b );

         material->ambient_value  = 1.0f;
         material->ambient_color  = material->Ka.ToColor();

         material->Kd.Set( matl.GetDiffuseColor().r,
                           matl.GetDiffuseColor().g,
                           matl.GetDiffuseColor().b );

         material->diffuse_value  = 1.0f;
         material->diffuse_color  = material->Kd.ToColor();

         material->Ks.Set( matl.GetSpecularColor().r,
                           matl.GetSpecularColor().g,
                           matl.GetSpecularColor().b );

         material->specular_value  = 1.0f;
         material->specular_color  = material->Ks.ToColor();

         material->power = matl.GetShininess() * 100;

         if (tex_diff.mapName[0])
            LoadTexture(tex_diff.mapName, material->tex_diffuse);

         if (tex_spec.mapName[0])
            LoadTexture(tex_spec.mapName, material->tex_specular);

         if (tex_bump.mapName[0])
            LoadTexture(tex_bump.mapName, material->tex_bumpmap);

         if (tex_glow.mapName[0])
            LoadTexture(tex_glow.mapName, material->tex_emissive);

         model->GetMaterials().append(material);
      }

      Surface* surface = new Surface;
      model->GetSurfaces().append(surface);

      surface->CreateVerts(nverts);
      surface->CreatePolys(npolys);

      VertexSet*  vset     = surface->GetVertexSet();
      Poly*       polys    = surface->GetPolys();
      float       radius   = 0;
      int         v        = 0;

      for (int m = 0; m < nmeshs && v < nverts; m++) {
         LMesh& mesh = loader.GetMesh(m);

         // read vertex set:
         for (int i = 0; i < mesh.GetVertexCount() && v < nverts; i++) {
            vset->loc[v].x = mesh.GetVertex(i).x;
            vset->loc[v].y = mesh.GetVertex(i).z;
            vset->loc[v].z = mesh.GetVertex(i).y;

            vset->nrm[v].x = mesh.GetNormal(i).x;
            vset->nrm[v].y = mesh.GetNormal(i).z;
            vset->nrm[v].z = mesh.GetNormal(i).y;

            vset->tu[v]    = mesh.GetUV(i).x;
            vset->tv[v]    = mesh.GetUV(i).y;

            float d = vset->loc[v].length();
            if (d > radius)
               radius = d;

            v++;
         }
      }

      if (radius < 16) {
         model->ScaleBy(256.0f / radius);
         radius = 256.0f;
      }

      int n = 0;

      for (int m = 0; m < nmeshs && n < npolys; m++) {
         LMesh& mesh = loader.GetMesh(m);

         // read polys:
         int mesh_tris = mesh.GetTriangleCount();
         for (int i = 0; i < mesh_tris && n < npolys; i++) {
            Poly*             p     = surface->GetPolys() + n++;
            const LTriangle&  tri   = mesh.GetTriangle(i);
            LTriangle2        tri2  = mesh.GetTriangle2(i);

            p->nverts = 3;

            p->verts[0] = tri.a + mesh_verts[m];
            p->verts[1] = tri.b + mesh_verts[m];
            p->verts[2] = tri.c + mesh_verts[m];

            if (p->verts[0] > nverts || p->verts[1] > nverts || p->verts[2] > nverts) {
               p->verts[0] = 0;
               p->verts[1] = 1;
               p->verts[2] = 2;
            }

            if (tri2.vertexNormals[0] == tri2.vertexNormals[1] &&
                tri2.vertexNormals[0] == tri2.vertexNormals[2])
               p->flatness = 1.0f;
            else
               p->flatness = 0.0f;

            p->vertex_set  = vset;
            p->material    = model->GetMaterials()[ tri2.materialId ];
            p->sortval     = tri2.materialId;

            p->plane       = Plane(vset->loc[ p->verts[0] ],
                                   vset->loc[ p->verts[2] ],
                                   vset->loc[ p->verts[1] ]);

            surface->AddIndices(p->nverts);
         }
      }

      // sort the polys by material index:
      qsort((void*) polys, npolys, sizeof(Poly), mcomp);

      // then assign them to cohesive segments:
      Segment* segment = 0;

      for (int n = 0; n < npolys; n++) {
         if (segment && segment->material == polys[n].material) {
            segment->npolys++;
         }
         else {
            segment = 0;
         }

         if (!segment) {
            segment = new Segment;

            segment->npolys   = 1;
            segment->polys    = &polys[n];
            segment->material = segment->polys->material;

            surface->GetSegments().append(segment);
         }
      }

      *pnverts = nverts;
      *pnpolys = npolys;
      *pradius = radius;

      model->Normalize();
      return true;
   }

   return false;
}

// +--------------------------------------------------------------------+

bool
ModelFile3DS::Save(Model* m)
{
   if (m) {
      ModelFile::Save(m);

      FILE* f = fopen(filename, "w");
      if (!f) {
         ::MessageBox(0, "3DS Export Failed: Magic could not open the file for writing", "ERROR", MB_OK);
         return false;
      }

      fclose(f);

      return true;
   }

   return false;
}

// +--------------------------------------------------------------------+