WIP of assimp integration.

Engine/lib/assimp/code/DXFHelper.h

@@ -0,0 +1,236 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2018, assimp team
+
+
+All rights reserved.
+
+Redistribution and use of this software 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 of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+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
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN 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.
+
+----------------------------------------------------------------------
+*/
+
+/** @file  DXFHelper.h
+ *  @brief Internal utilities for the DXF loader.
+ */
+
+#ifndef INCLUDED_DXFHELPER_H
+#define INCLUDED_DXFHELPER_H
+
+#include <assimp/LineSplitter.h>
+#include <assimp/TinyFormatter.h>
+#include <assimp/StreamReader.h>
+#include <assimp/fast_atof.h>
+#include <vector>
+#include <assimp/DefaultLogger.hpp>
+
+namespace Assimp {
+    namespace DXF {
+
+
+// read pairs of lines, parse group code and value and provide utilities
+// to convert the data to the target data type.
+class LineReader
+{
+
+public:
+
+    LineReader(StreamReaderLE& reader)
+         // do NOT skip empty lines. In DXF files, they count as valid data.
+        : splitter(reader,false,true)
+        , groupcode( 0 )
+        , value()
+        , end()
+    {
+    }
+
+public:
+
+
+    // -----------------------------------------
+    bool Is(int gc, const char* what) const {
+        return groupcode == gc && !strcmp(what,value.c_str());
+    }
+
+    // -----------------------------------------
+    bool Is(int gc) const {
+        return groupcode == gc;
+    }
+
+    // -----------------------------------------
+    int GroupCode() const {
+        return groupcode;
+    }
+
+    // -----------------------------------------
+    const std::string& Value() const {
+        return value;
+    }
+
+    // -----------------------------------------
+    bool End() const {
+        return !((bool)*this);
+    }
+
+public:
+
+    // -----------------------------------------
+    unsigned int ValueAsUnsignedInt() const {
+        return strtoul10(value.c_str());
+    }
+
+    // -----------------------------------------
+    int ValueAsSignedInt() const {
+        return strtol10(value.c_str());
+    }
+
+    // -----------------------------------------
+    float ValueAsFloat() const {
+        return fast_atof(value.c_str());
+    }
+
+public:
+
+    // -----------------------------------------
+    /** pseudo-iterator increment to advance to the next (groupcode/value) pair */
+    LineReader& operator++() {
+        if (end) {
+            if (end == 1) {
+                ++end;
+            }
+            return *this;
+        }
+
+        try {
+            groupcode = strtol10(splitter->c_str());
+            splitter++;
+
+            value = *splitter;
+            splitter++;
+
+            // automatically skip over {} meta blocks (these are for application use
+            // and currently not relevant for Assimp).
+            if (value.length() && value[0] == '{') {
+
+                size_t cnt = 0;
+                for(;splitter->length() && splitter->at(0) != '}'; splitter++, cnt++);
+
+                splitter++;
+                ASSIMP_LOG_DEBUG((Formatter::format("DXF: skipped over control group ("),cnt," lines)"));
+            }
+        } catch(std::logic_error&) {
+            ai_assert(!splitter);
+        }
+        if (!splitter) {
+            end = 1;
+        }
+        return *this;
+    }
+
+    // -----------------------------------------
+    LineReader& operator++(int) {
+        return ++(*this);
+    }
+
+
+    // -----------------------------------------
+    operator bool() const {
+        return end <= 1;
+    }
+
+private:
+    LineSplitter splitter;
+    int groupcode;
+    std::string value;
+    int end;
+};
+
+
+
+// represents a POLYLINE or a LWPOLYLINE. or even a 3DFACE The data is converted as needed.
+struct PolyLine
+{
+    PolyLine()
+        : flags()
+    {}
+
+    std::vector<aiVector3D> positions;
+    std::vector<aiColor4D>  colors;
+    std::vector<unsigned int> indices;
+    std::vector<unsigned int> counts;
+    unsigned int flags;
+
+    std::string layer;
+    std::string desc;
+};
+
+
+// reference to a BLOCK. Specifies its own coordinate system.
+struct InsertBlock
+{
+    InsertBlock()
+        : scale(1.f,1.f,1.f)
+        , angle()
+    {}
+
+    aiVector3D pos;
+    aiVector3D scale;
+    float angle;
+
+    std::string name;
+};
+
+
+// keeps track of all geometry in a single BLOCK.
+struct Block
+{
+    std::vector< std::shared_ptr<PolyLine> > lines;
+    std::vector<InsertBlock> insertions;
+
+    std::string name;
+    aiVector3D base;
+};
+
+
+struct FileData
+{
+    // note: the LAST block always contains the stuff from ENTITIES.
+    std::vector<Block> blocks;
+};
+
+
+
+
+
+}}
+#endif