From e81e9c0c6834ff7753680751780c5bd55fbdee2e Mon Sep 17 00:00:00 2001
From: Nick Gasson <nick@nickg.me.uk>
Date: Thu, 9 Jul 2009 21:50:59 +0100
Subject: [PATCH] Add FLTK model viewer

---
 include/ModelViewer.hpp | 42 ++++++++++++++++++++++
 src/Editor.cpp          |  5 +++
 src/Mesh.cpp            |  2 +-
 src/ModelViewer.cpp     | 78 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 126 insertions(+), 1 deletion(-)
 create mode 100644 include/ModelViewer.hpp
 create mode 100644 src/ModelViewer.cpp

diff --git a/include/ModelViewer.hpp b/include/ModelViewer.hpp
new file mode 100644
index 0000000..aac186b
--- /dev/null
+++ b/include/ModelViewer.hpp
@@ -0,0 +1,42 @@
+//
+//  Copyright (C) 2009  Nick Gasson
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INC_MODELVIEWER_HPP
+#define INC_MODELVIEWER_HPP
+
+#include "Platform.hpp"
+#include "IModel.hpp"
+
+#include <FL/Fl.H>
+#include <FL/Fl_Gl_Window.H>
+
+// FLTK widget for displaying models
+class ModelViewer : public Fl_Gl_Window {
+public:
+   ModelViewer(int x, int y, int w, int h);
+   ~ModelViewer();
+
+   void setModel(IModelPtr aModel) { myModel = aModel; }
+
+   // Fl_Gl_Window interface
+   void draw();
+   int handle(int anEvent);
+private:
+   IModelPtr myModel;
+};
+
+#endif
diff --git a/src/Editor.cpp b/src/Editor.cpp
index 23b6b84..2b970d5 100644
--- a/src/Editor.cpp
+++ b/src/Editor.cpp
@@ -22,6 +22,7 @@
 #include "Maths.hpp"
 #include "ILight.hpp"
 #include "BuildingPanel.hpp"
+#include "ModelViewer.hpp"
 
 #include <algorithm>
 
@@ -99,6 +100,7 @@ namespace {
    };
    
    Fl_Menu_Button* theToolMenu;
+   ModelViewer* theModelViewer;
    
    Editor* theEditor = NULL;
    
@@ -116,6 +118,9 @@ void addEditorGUI()
    
    theToolMenu = new Fl_Menu_Button(0, 0, panelW, 32);
    theToolMenu->copy(theTools);
+
+   theModelViewer = new ModelViewer(0, 40, panelW, 200);
+   theModelViewer->setModel(loadModel("pclass.obj"));
 }
 
 Editor::Editor(IMapPtr aMap, const string& aFileName) 
diff --git a/src/Mesh.cpp b/src/Mesh.cpp
index f719545..d3e2a02 100644
--- a/src/Mesh.cpp
+++ b/src/Mesh.cpp
@@ -551,7 +551,7 @@ IMeshPtr makeMesh(IMeshBufferPtr aBuffer)
 {
    //aBuffer->printStats();
 
-   // Prefer VBOs for large meshes meshes
+   // Prefer VBOs for large meshes
    if (aBuffer->vertexCount() > 100 && GLEW_ARB_vertex_buffer_object)
       return IMeshPtr(new VBOMesh(aBuffer));
    else
diff --git a/src/ModelViewer.cpp b/src/ModelViewer.cpp
new file mode 100644
index 0000000..c78f6ab
--- /dev/null
+++ b/src/ModelViewer.cpp
@@ -0,0 +1,78 @@
+//
+//  Copyright (C) 2009  Nick Gasson
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "ModelViewer.hpp"
+#include "ILight.hpp"
+
+#include <stdexcept>
+
+#include <boost/lexical_cast.hpp>
+
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+using namespace boost;
+
+ModelViewer::ModelViewer(int x, int y, int w, int h)
+   : Fl_Gl_Window(x, y, w, h)
+{
+
+}
+
+ModelViewer::~ModelViewer()
+{
+
+}
+
+void ModelViewer::draw()
+{
+   static ILightPtr sun = makeSunLight();
+   
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+
+   const GLfloat wf = static_cast<GLfloat>(w());
+   const GLfloat hf = static_cast<GLfloat>(h());
+   gluPerspective(45.0f, wf/hf, 0.1f, 50.0f);
+
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+
+   glEnable(GL_LIGHTING);
+   glEnable(GL_DEPTH_TEST);
+   
+   sun->apply();
+   
+   if (myModel) {
+      glRotatef(45.0f, 1.0f, 0.0f, 0.0f);
+      glRotatef(45.0f, 0.0f, 1.0f, 0.0f);
+      glTranslatef(5.0f, -8.0f, -4.0f);
+      glColor3f(1.0f, 1.0f, 1.0f);
+      myModel->render();
+   }
+
+   GLenum error = glGetError();
+   if (error != GL_NO_ERROR) {   
+      throw runtime_error
+         ("OpenGL error: " + lexical_cast<string>(gluErrorString(error)));
+   }
+}
+
+int ModelViewer::handle(int anEvent)
+{
+   return Fl_Gl_Window::handle(anEvent);
+}
-- 
2.39.2