From d6645d0494f55509c868dadcd91058e0cdc7fc03 Mon Sep 17 00:00:00 2001
From: Nick Gasson <nick@nickg.me.uk>
Date: Sat, 5 Dec 2009 15:58:04 +0000
Subject: [PATCH] Add new 3D preview window

---
 include/gui/Canvas3D.hpp | 37 ++++++++++++++++++++
 src/gui/Canvas3D.cpp     | 75 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+)
 create mode 100644 include/gui/Canvas3D.hpp
 create mode 100644 src/gui/Canvas3D.cpp

diff --git a/include/gui/Canvas3D.hpp b/include/gui/Canvas3D.hpp
new file mode 100644
index 0000000..90eac87
--- /dev/null
+++ b/include/gui/Canvas3D.hpp
@@ -0,0 +1,37 @@
+//
+//  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_CANVAS3D_HPP
+#define INC_CANVAS3D_HPP
+
+#include "Platform.hpp"
+#include "gui/Widget.hpp"
+
+namespace gui {
+
+   // A canvas which arbitrary 3D scenes can be rendered on
+   class Canvas3D : public Widget {
+   public:
+      Canvas3D(const AttributeSet& attrs);
+
+      void render(RenderContext& rc) const;
+   private:
+      bool clear;
+   };
+}
+
+#endif
diff --git a/src/gui/Canvas3D.cpp b/src/gui/Canvas3D.cpp
new file mode 100644
index 0000000..e574c0c
--- /dev/null
+++ b/src/gui/Canvas3D.cpp
@@ -0,0 +1,75 @@
+//
+//  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 "gui/Canvas3D.hpp"
+#include "ILogger.hpp"
+
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+#include <boost/lexical_cast.hpp>
+
+using namespace gui;
+using namespace boost;
+
+Canvas3D::Canvas3D(const AttributeSet& attrs)
+   : Widget(attrs),
+     clear(attrs.get<bool>("clear", true))
+{
+
+}
+
+void Canvas3D::render(RenderContext& rc) const
+{
+   glPushAttrib(GL_ALL_ATTRIB_BITS);
+   glPushMatrix();
+
+   glMatrixMode(GL_PROJECTION);
+   glPushMatrix();
+   glLoadIdentity();
+
+   const GLfloat wf = static_cast<GLfloat>(width());
+   const GLfloat hf = static_cast<GLfloat>(height());
+   gluPerspective(45.0f, wf/hf, 0.1f, 50.0f);
+
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+
+   if (clear)
+      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   glEnable(GL_LIGHTING);
+   glEnable(GL_DEPTH_TEST);
+
+   const_cast<Canvas3D*>(this)->raise(SIG_RENDER);
+   
+   glMatrixMode(GL_PROJECTION);
+   glPopMatrix();
+
+   glMatrixMode(GL_MODELVIEW);
+   glPopMatrix();
+   
+   glPopAttrib();
+   
+   GLenum error = glGetError();
+   if (error != GL_NO_ERROR) {   
+      throw runtime_error
+         ("OpenGL error: " + lexical_cast<string>(gluErrorString(error)));
+   }
+}
+
+      
-- 
2.39.2