Initial work on OBJ model support
What works: - Parsing the model - Constructing geometry (surfaces) for triangulated models What doesn't: - Rendering the model - Building the vertex buffer - Triangulating quads
This commit is contained in:
Kevin Caccamo
Christoph Oelckers
parent
7c4dd9408d
commit
1c15fb2408
4 changed files with 444 additions and 1 deletions
344
src/r_data/models/models_obj.cpp
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344
src/r_data/models/models_obj.cpp
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//
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//---------------------------------------------------------------------------
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//
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// Copyright(C) 2018 Kevin Caccamo
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// All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see http://www.gnu.org/licenses/
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//
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//--------------------------------------------------------------------------
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#include "w_wad.h"
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#include "cmdlib.h"
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#include "r_data/models/models_obj.h"
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bool FOBJModel::Load(const char* fn, int lumpnum, const char* buffer, int length)
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{
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FString objName = Wads.GetLumpFullPath(lumpnum);
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sc.OpenMem(objName, buffer, length);
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Printf("Parsing %s\n", objName.GetChars());
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while(sc.GetString())
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{
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if (sc.Compare("#")) // Line comment
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{
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sc.Line += 1; // I don't think this does anything, though...
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}
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else if (sc.Compare("v")) // Vertex
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{
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ParseVector3(this->verts);
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}
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else if (sc.Compare("vn")) // Vertex normal
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{
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ParseVector3(this->norms);
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}
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else if (sc.Compare("vt")) // UV Coordinates
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{
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ParseVector2(this->uvs);
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}
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else if (sc.Compare("usemtl"))
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{
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// Get material name and try to load it
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sc.MustGetString();
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curMtl = LoadSkin("", sc.String);
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if (!curMtl.isValid())
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{
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// Relative to model file path?
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curMtl = LoadSkin(fn, sc.String);
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}
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if (!curMtl.isValid())
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{
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// Don't use materials that don't exist
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continue;
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}
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// Most OBJs are sorted by material, but just in case the one we're loading isn't...
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// Build surface...
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if (curSurface == nullptr)
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{
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// First surface
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curSurface = new OBJSurface(curMtl);
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}
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else
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{
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if (curSurfFaceCount > 0)
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{
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// Search for existing surface with current material
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/*
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for(size_t i = 0; i < surfaces.Size(); i++)
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{
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if (surfaces[i].skin == curMtl)
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{
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curSurface = &surfaces[i];
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surfExists = true;
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}
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}
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*/
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// Add previous surface
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curSurface->numFaces = curSurfFaceCount;
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curSurface->faceStart = aggSurfFaceCount;
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surfaces.Push(*curSurface);
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delete curSurface;
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// Go to next surface
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curSurface = new OBJSurface(curMtl);
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aggSurfFaceCount += curSurfFaceCount;
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}
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else
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{
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curSurface->skin = curMtl;
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}
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}
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curSurfFaceCount = 0;
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}
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else if (sc.Compare("f"))
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{
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FString sides[4];
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OBJFace face;
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for (int i = 0; i < 3; i++)
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{
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// A face must have at least 3 sides
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sc.MustGetString();
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sides[i] = sc.String;
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ParseFaceSide(sides[i], face, i);
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}
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face.sideCount = 3;
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if (sc.GetString())
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{
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if (!sc.Compare("f"))
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{
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sides[3] = sc.String;
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face.sideCount += 1;
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ParseFaceSide(sides[3], face, 3);
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}
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else
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{
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sc.UnGet(); // No 4th side, move back
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}
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}
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faces.Push(face);
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curSurfFaceCount += 1;
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}
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}
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sc.Close();
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// No valid materials detected
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if (curSurface == nullptr)
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{
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FTextureID dummyMtl = LoadSkin("", "-NOFLAT-"); // Built-in to GZDoom
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curSurface = new OBJSurface(dummyMtl);
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}
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curSurface->numFaces = curSurfFaceCount;
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curSurface->faceStart = aggSurfFaceCount;
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surfaces.Push(*curSurface);
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delete curSurface;
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/*
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Printf("%d vertices\n", verts.Size());
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Printf("%d normals\n", norms.Size());
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Printf("%d UVs\n", uvs.Size());
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Printf("%d faces\n", faces.Size());
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Printf("%d surfaces\n", surfaces.Size());
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*/
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mLumpNum = lumpnum;
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for (size_t i = 0; i < surfaces.Size(); i++)
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{
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ConstructSurfaceTris(&surfaces[i]);
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}
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return true;
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}
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/**
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* Parse a 2D vector
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*
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* @param start The buffer to parse from
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* @param array The array to append the parsed vector to
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*/
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void FOBJModel::ParseVector2(TArray<FVector2> &array)
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{
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float coord[2];
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for (int axis = 0; axis < 2; axis++)
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{
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sc.MustGetFloat();
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coord[axis] = (float)sc.Float;
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}
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FVector2 vec(coord);
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array.Push(vec);
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}
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/**
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* Parse a 3D vector
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*
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* @param start The buffer to parse from
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* @param array The array to append the parsed vector to
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*/
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void FOBJModel::ParseVector3(TArray<FVector3> &array)
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{
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float coord[3];
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for (int axis = 0; axis < 3; axis++)
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{
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sc.MustGetFloat();
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coord[axis] = (float)sc.Float;
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}
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FVector3 vec(coord);
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array.Push(vec);
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}
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void FOBJModel::ParseFaceSide(const FString &sideStr, OBJFace &face, int sidx)
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{
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OBJFaceSide side;
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int origIdx;
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if (sideStr.IndexOf("/") >= 0)
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{
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TArray<FString> sides = sideStr.Split("/");
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if (sides[0].Len() > 0)
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{
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origIdx = atoi(sides[0].GetChars());
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side.vertref = ResolveIndex(origIdx, FaceElement::VertexIndex);
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}
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if (sides[1].Len() > 0)
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{
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origIdx = atoi(sides[1].GetChars());
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side.uvref = ResolveIndex(origIdx, FaceElement::UVIndex);
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}
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if (sides.Size() > 2)
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{
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if (sides[2].Len() > 0)
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{
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origIdx = atoi(sides[2].GetChars());
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side.normref = ResolveIndex(origIdx, FaceElement::VNormalIndex);
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}
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}
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}
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else
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{
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origIdx = atoi(sideStr.GetChars());
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side.vertref = ResolveIndex(origIdx, FaceElement::VertexIndex);
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side.normref = 0;
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side.uvref = 0;
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}
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face.sides[sidx] = side;
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}
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int FOBJModel::ResolveIndex(int origIndex, FaceElement el)
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{
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if (origIndex > 0)
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{
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return origIndex - 1; // OBJ indices start at 1
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}
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else if (origIndex < 0)
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{
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if (el == FaceElement::VertexIndex)
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{
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return this->verts.Size() + origIndex; // origIndex is negative
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}
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else if (el == FaceElement::UVIndex)
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{
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return this->uvs.Size() + origIndex;
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}
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else if (el == FaceElement::VNormalIndex)
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{
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return this->norms.Size() + origIndex;
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}
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}
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return 0;
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}
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void FOBJModel::TriangulateQuad(const OBJFace &quad, OBJFace *tris)
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{
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// if (quad.sides < 3 || quad.sides > 4) exception
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// if (quad.sides == 3) return &quad;
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tris[0].sideCount = 3;
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tris[1].sideCount = 3;
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for (int i = 0; i < 3; i++)
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{
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tris[0].sides[i].vertref = quad.sides[i].vertref;
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tris[1].sides[i].vertref = quad.sides[i+1].vertref;
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tris[0].sides[i].uvref = quad.sides[i].uvref;
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tris[1].sides[i].uvref = quad.sides[i+1].uvref;
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tris[0].sides[i].normref = quad.sides[i].normref;
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tris[1].sides[i].normref = quad.sides[i+1].normref;
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}
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}
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void FOBJModel::ConstructSurfaceTris(OBJSurface *surf)
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{
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int triCount = 0;
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size_t start = surf->faceStart;
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size_t end = start + surf->numFaces;
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for (size_t i = start; i < end; i++)
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{
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triCount += (faces[i].sideCount > 3) ? 2 : 1;
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}
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surf->numTris = triCount;
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surf->tris = new OBJFace[triCount];
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int quadCount = 0;
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for (size_t i = start; i < end; i++)
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{
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surf->tris[i+quadCount].sideCount = 3;
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if (faces[i].sideCount == 3)
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{
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memcpy(surf->tris[i+quadCount].sides, faces[i].sides, sizeof(OBJFaceSide) * 3);
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}
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else if (faces[i].sideCount == 4)
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{
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OBJFace *triangulated = new OBJFace[2];
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TriangulateQuad(faces[i], triangulated);
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memcpy(surf->tris[i+quadCount].sides, triangulated->sides, sizeof(OBJFaceSide) * 3);
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memcpy(surf->tris[i+quadCount+1].sides, (triangulated+1)->sides, sizeof(OBJFaceSide) * 3);
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delete[] triangulated;
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quadCount += 1;
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}
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}
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}
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int FOBJModel::FindFrame(const char* name)
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{
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return 0; // OBJs are not animated.
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}
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// Stubs - I don't know what these do exactly
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void FOBJModel::RenderFrame(FModelRenderer *renderer, FTexture * skin, int frameno, int frameno2, double inter, int translation)
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{
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/*
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for (int i = 0; i < numMtls; i++)
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{
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renderer->SetMaterial(skin, false, translation);
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GetVertexBuffer(renderer)->SetupFrame(renderer, surf->vindex + frameno * surf->numVertices, surf->vindex + frameno2 * surf->numVertices, surf->numVertices);
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renderer->DrawElements(surf->numTriangles * 3, surf->iindex * sizeof(unsigned int));
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}
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*/
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}
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void FOBJModel::BuildVertexBuffer(FModelRenderer *renderer)
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{
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}
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void FOBJModel::AddSkins(uint8_t* hitlist)
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{
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}
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FOBJModel::~FOBJModel()
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{
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for (size_t i = 0; i < surfaces.Size(); i++)
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{
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delete[] surfaces[i].tris;
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}
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}
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