366 lines
12 KiB
C
366 lines
12 KiB
C
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/*
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==============================================================================
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This file is part of the JUCE examples.
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Copyright (c) 2020 - Raw Material Software Limited
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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES,
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WHETHER EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR
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PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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#pragma once
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#include <map>
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//==============================================================================
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/**
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This is a quick-and-dirty parser for the 3D OBJ file format.
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Just call load() and if there aren't any errors, the 'shapes' array should
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be filled with all the shape objects that were loaded from the file.
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*/
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class WavefrontObjFile
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{
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public:
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WavefrontObjFile() {}
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Result load (const String& objFileContent)
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{
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shapes.clear();
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return parseObjFile (StringArray::fromLines (objFileContent));
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}
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Result load (const File& file)
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{
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sourceFile = file;
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return load (file.loadFileAsString());
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}
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//==============================================================================
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typedef juce::uint32 Index;
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struct Vertex { float x, y, z; };
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struct TextureCoord { float x, y; };
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struct Mesh
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{
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Array<Vertex> vertices, normals;
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Array<TextureCoord> textureCoords;
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Array<Index> indices;
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};
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struct Material
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{
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Material() noexcept
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{
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zerostruct (ambient);
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zerostruct (diffuse);
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zerostruct (specular);
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zerostruct (transmittance);
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zerostruct (emission);
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}
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String name;
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Vertex ambient, diffuse, specular, transmittance, emission;
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float shininess = 1.0f, refractiveIndex = 0.0f;
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String ambientTextureName, diffuseTextureName,
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specularTextureName, normalTextureName;
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StringPairArray parameters;
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};
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struct Shape
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{
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String name;
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Mesh mesh;
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Material material;
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};
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OwnedArray<Shape> shapes;
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private:
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//==============================================================================
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File sourceFile;
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struct TripleIndex
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{
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TripleIndex() noexcept {}
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bool operator< (const TripleIndex& other) const noexcept
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{
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if (this == &other)
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return false;
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if (vertexIndex != other.vertexIndex)
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return vertexIndex < other.vertexIndex;
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if (textureIndex != other.textureIndex)
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return textureIndex < other.textureIndex;
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return normalIndex < other.normalIndex;
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}
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int vertexIndex = -1, textureIndex = -1, normalIndex = -1;
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};
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struct IndexMap
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{
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std::map<TripleIndex, Index> map;
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Index getIndexFor (TripleIndex i, Mesh& newMesh, const Mesh& srcMesh)
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{
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const std::map<TripleIndex, Index>::iterator it (map.find (i));
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if (it != map.end())
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return it->second;
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auto index = (Index) newMesh.vertices.size();
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if (isPositiveAndBelow (i.vertexIndex, srcMesh.vertices.size()))
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newMesh.vertices.add (srcMesh.vertices.getReference (i.vertexIndex));
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if (isPositiveAndBelow (i.normalIndex, srcMesh.normals.size()))
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newMesh.normals.add (srcMesh.normals.getReference (i.normalIndex));
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if (isPositiveAndBelow (i.textureIndex, srcMesh.textureCoords.size()))
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newMesh.textureCoords.add (srcMesh.textureCoords.getReference (i.textureIndex));
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map[i] = index;
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return index;
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}
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};
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static float parseFloat (String::CharPointerType& t)
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{
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t.incrementToEndOfWhitespace();
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return (float) CharacterFunctions::readDoubleValue (t);
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}
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static Vertex parseVertex (String::CharPointerType t)
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{
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Vertex v;
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v.x = parseFloat (t);
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v.y = parseFloat (t);
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v.z = parseFloat (t);
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return v;
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}
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static TextureCoord parseTextureCoord (String::CharPointerType t)
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{
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TextureCoord tc;
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tc.x = parseFloat (t);
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tc.y = parseFloat (t);
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return tc;
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}
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static bool matchToken (String::CharPointerType& t, const char* token)
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{
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auto len = (int) strlen (token);
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if (CharacterFunctions::compareUpTo (CharPointer_ASCII (token), t, len) == 0)
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{
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auto end = t + len;
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if (end.isEmpty() || end.isWhitespace())
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{
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t = end.findEndOfWhitespace();
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return true;
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}
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}
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return false;
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}
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struct Face
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{
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Face (String::CharPointerType t)
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{
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while (! t.isEmpty())
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triples.add (parseTriple (t));
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}
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Array<TripleIndex> triples;
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void addIndices (Mesh& newMesh, const Mesh& srcMesh, IndexMap& indexMap)
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{
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TripleIndex i0 (triples[0]), i1, i2 (triples[1]);
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for (auto i = 2; i < triples.size(); ++i)
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{
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i1 = i2;
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i2 = triples.getReference (i);
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newMesh.indices.add (indexMap.getIndexFor (i0, newMesh, srcMesh));
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newMesh.indices.add (indexMap.getIndexFor (i1, newMesh, srcMesh));
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newMesh.indices.add (indexMap.getIndexFor (i2, newMesh, srcMesh));
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}
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}
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static TripleIndex parseTriple (String::CharPointerType& t)
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{
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TripleIndex i;
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t.incrementToEndOfWhitespace();
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i.vertexIndex = t.getIntValue32() - 1;
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t = findEndOfFaceToken (t);
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if (t.isEmpty() || t.getAndAdvance() != '/')
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return i;
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if (*t == '/')
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{
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++t;
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}
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else
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{
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i.textureIndex = t.getIntValue32() - 1;
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t = findEndOfFaceToken (t);
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if (t.isEmpty() || t.getAndAdvance() != '/')
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return i;
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}
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i.normalIndex = t.getIntValue32() - 1;
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t = findEndOfFaceToken (t);
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return i;
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}
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static String::CharPointerType findEndOfFaceToken (String::CharPointerType t) noexcept
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{
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return CharacterFunctions::findEndOfToken (t, CharPointer_ASCII ("/ \t"), String().getCharPointer());
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}
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};
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static Shape* parseFaceGroup (const Mesh& srcMesh,
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Array<Face>& faceGroup,
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const Material& material,
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const String& name)
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{
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if (faceGroup.size() == 0)
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return nullptr;
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std::unique_ptr<Shape> shape (new Shape());
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shape->name = name;
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shape->material = material;
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IndexMap indexMap;
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for (auto& f : faceGroup)
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f.addIndices (shape->mesh, srcMesh, indexMap);
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return shape.release();
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}
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Result parseObjFile (const StringArray& lines)
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{
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Mesh mesh;
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Array<Face> faceGroup;
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Array<Material> knownMaterials;
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Material lastMaterial;
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String lastName;
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for (auto lineNum = 0; lineNum < lines.size(); ++lineNum)
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{
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auto l = lines[lineNum].getCharPointer().findEndOfWhitespace();
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if (matchToken (l, "v")) { mesh.vertices .add (parseVertex (l)); continue; }
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if (matchToken (l, "vn")) { mesh.normals .add (parseVertex (l)); continue; }
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if (matchToken (l, "vt")) { mesh.textureCoords.add (parseTextureCoord (l)); continue; }
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if (matchToken (l, "f")) { faceGroup .add (Face (l)); continue; }
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if (matchToken (l, "usemtl"))
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{
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auto name = String (l).trim();
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for (auto i = knownMaterials.size(); --i >= 0;)
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{
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if (knownMaterials.getReference (i).name == name)
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{
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lastMaterial = knownMaterials.getReference (i);
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break;
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}
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}
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continue;
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}
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if (matchToken (l, "mtllib"))
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{
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auto r = parseMaterial (knownMaterials, String (l).trim());
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continue;
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}
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if (matchToken (l, "g") || matchToken (l, "o"))
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{
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if (auto* shape = parseFaceGroup (mesh, faceGroup, lastMaterial, lastName))
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shapes.add (shape);
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faceGroup.clear();
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lastName = StringArray::fromTokens (l, " \t", "")[0];
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continue;
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}
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}
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if (auto* shape = parseFaceGroup (mesh, faceGroup, lastMaterial, lastName))
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shapes.add (shape);
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return Result::ok();
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}
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Result parseMaterial (Array<Material>& materials, const String& filename)
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{
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jassert (sourceFile.exists());
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auto f = sourceFile.getSiblingFile (filename);
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if (! f.exists())
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return Result::fail ("Cannot open file: " + filename);
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auto lines = StringArray::fromLines (f.loadFileAsString());
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materials.clear();
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Material material;
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for (auto line : lines)
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{
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auto l = line.getCharPointer().findEndOfWhitespace();
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if (matchToken (l, "newmtl")) { materials.add (material); material.name = String (l).trim(); continue; }
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if (matchToken (l, "Ka")) { material.ambient = parseVertex (l); continue; }
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if (matchToken (l, "Kd")) { material.diffuse = parseVertex (l); continue; }
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if (matchToken (l, "Ks")) { material.specular = parseVertex (l); continue; }
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if (matchToken (l, "Kt")) { material.transmittance = parseVertex (l); continue; }
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if (matchToken (l, "Ke")) { material.emission = parseVertex (l); continue; }
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if (matchToken (l, "Ni")) { material.refractiveIndex = parseFloat (l); continue; }
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if (matchToken (l, "Ns")) { material.shininess = parseFloat (l); continue; }
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if (matchToken (l, "map_Ka")) { material.ambientTextureName = String (l).trim(); continue; }
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if (matchToken (l, "map_Kd")) { material.diffuseTextureName = String (l).trim(); continue; }
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if (matchToken (l, "map_Ks")) { material.specularTextureName = String (l).trim(); continue; }
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if (matchToken (l, "map_Ns")) { material.normalTextureName = String (l).trim(); continue; }
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auto tokens = StringArray::fromTokens (l, " \t", "");
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if (tokens.size() >= 2)
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material.parameters.set (tokens[0].trim(), tokens[1].trim());
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}
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materials.add (material);
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return Result::ok();
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}
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (WavefrontObjFile)
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};
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