Add experimental OBJ exporter code.

plugins/model/Makefile.am

@@ -11,6 +11,7 @@ model_la_LIBADD = $(top_builddir)/libs/picomodel/libpicomodel.la \
 model_la_SOURCES = AseExporter.cpp \
                    Lwo2Chunk.cpp \
                    Lwo2Exporter.cpp \
+				   WavefrontExporter.cpp \
                    PicoModelNode.cpp \
                    RenderablePicoModel.cpp \
                    PicoModelLoader.cpp \

plugins/model/PicoModelModule.h

@@ -12,6 +12,7 @@
 #include "PicoModelLoader.h"
 #include "AseExporter.h"
 #include "Lwo2Exporter.h"
+#include "WavefrontExporter.h"
 
 typedef unsigned char byte;
 
@@ -113,6 +114,7 @@ class PicoModelModule :
 
 		GlobalModelFormatManager().registerExporter(std::make_shared<AseExporter>());
 		GlobalModelFormatManager().registerExporter(std::make_shared<Lwo2Exporter>());
+		GlobalModelFormatManager().registerExporter(std::make_shared<WavefrontExporter>());
 	}
 };
 

plugins/model/WavefrontExporter.cpp

@@ -0,0 +1,88 @@
+#include "WavefrontExporter.h"
+
+#include "itextstream.h"
+#include "imodelsurface.h"
+#include "imap.h"
+
+#include <boost/algorithm/string/replace.hpp>
+#include <boost/format.hpp>
+
+namespace model
+{
+
+WavefrontExporter::WavefrontExporter()
+{}
+
+IModelExporterPtr WavefrontExporter::clone()
+{
+	return std::make_shared<WavefrontExporter>();
+}
+
+const std::string& WavefrontExporter::getDisplayName() const
+{
+	static std::string _extension("Wavefront OBJ");
+	return _extension;
+}
+
+const std::string& WavefrontExporter::getExtension() const
+{
+	static std::string _extension("OBJ");
+	return _extension;
+}
+
+void WavefrontExporter::exportToStream(std::ostream& stream)
+{
+	// Count exported vertices. Exported indices are 1-based though.
+	std::size_t vertexCount = 0;
+
+	// Each surface is exported as group. 
+	for (const Surfaces::value_type& pair : _surfaces)
+	{
+		const Surface& surface = pair.second;
+
+		// Base index for vertices, added to the surface indices
+		std::size_t vertBaseIndex = vertexCount;
+
+		// Since we don't write .mtl files store at least the material into the group name
+		stream << "g " << surface.materialName << std::endl;
+		stream << std::endl;
+
+		// Temporary buffers for vertices, texcoords and polys
+		std::stringstream vertexBuf;
+		std::stringstream texCoordBuf;
+		std::stringstream polyBuf;
+
+		for (const ArbitraryMeshVertex& meshVertex : surface.vertices)
+		{
+			// Write coordinates into the export buffers
+			const Vector3& vert = meshVertex.vertex;
+			const Vector2& uv = meshVertex.texcoord;
+
+			vertexBuf << "v " << vert.x() << " " << vert.y() << " " << vert.z() << "\n";
+			texCoordBuf << "vt " << uv.x() << " " << uv.y() << "\n";
+
+			vertexCount++;
+		}
+
+		// Every three indices form a triangle. Indices are 1-based so add +1 to each index
+		for (std::size_t i = 0; i + 2 < surface.indices.size(); i += 3)
+		{ 
+			std::size_t index1 = vertBaseIndex + static_cast<std::size_t>(surface.indices[i+0]) + 1;
+			std::size_t index2 = vertBaseIndex + static_cast<std::size_t>(surface.indices[i+1]) + 1;
+			std::size_t index3 = vertBaseIndex + static_cast<std::size_t>(surface.indices[i+2]) + 1;
+
+			// f 1/1 3/3 2/2
+			polyBuf << "f";
+			polyBuf << " " << index1 << "/" << index1;
+			polyBuf << " " << index2 << "/" << index2;
+			polyBuf << " " << index3 << "/" << index3;
+			polyBuf << "\n";
+		}
+
+		stream << vertexBuf.str() << std::endl;
+		stream << texCoordBuf.str() << std::endl;
+		stream << polyBuf.str() << std::endl;
+	}
+}
+
+}

plugins/model/WavefrontExporter.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include "imodel.h"
+#include "ModelExporterBase.h"
+
+namespace model
+{
+
+class WavefrontExporter :
+	public ModelExporterBase
+{
+public:
+	WavefrontExporter();
+
+	IModelExporterPtr clone() override;
+
+	Format getFileFormat() const override
+	{
+		return Format::Text;
+	}
+
+	const std::string& getDisplayName() const override;
+
+	// Returns the uppercase file extension this exporter is suitable for
+	const std::string& getExtension() const override;
+
+	// Export the model file to the given stream
+	void exportToStream(std::ostream& stream)  override;
+};
+
+}

tools/msvc/model.vcxproj

@@ -323,6 +323,7 @@
     <ClCompile Include="..\..\plugins\model\plugin.cpp" />
     <ClCompile Include="..\..\plugins\model\RenderablePicoModel.cpp" />
     <ClCompile Include="..\..\plugins\model\RenderablePicoSurface.cpp" />
+    <ClCompile Include="..\..\plugins\model\WavefrontExporter.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\plugins\model\AseExporter.h" />
@@ -335,6 +336,7 @@
     <ClInclude Include="..\..\plugins\model\plugin.h" />
     <ClInclude Include="..\..\plugins\model\RenderablePicoModel.h" />
     <ClInclude Include="..\..\plugins\model\RenderablePicoSurface.h" />
+    <ClInclude Include="..\..\plugins\model\WavefrontExporter.h" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="picomodellib.vcxproj">

tools/msvc/model.vcxproj.filters

@@ -31,6 +31,9 @@
     <ClCompile Include="..\..\plugins\model\Lwo2Chunk.cpp">
       <Filter>src</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\plugins\model\WavefrontExporter.cpp">
+      <Filter>src</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\plugins\model\PicoModelLoader.h">
@@ -63,5 +66,8 @@
     <ClInclude Include="..\..\plugins\model\ModelExporterBase.h">
       <Filter>src</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\plugins\model\WavefrontExporter.h">
+      <Filter>src</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>