OpenGL hacks.

1 files changed, 167 insertions, 0 deletions

diff --git a/hacks/gl/basic_gl_pane.cc b/hacks/gl/basic_gl_pane.cc
new file mode 100644
index 000000000..565bf4cee
--- /dev/null
+++ b/hacks/gl/basic_gl_pane.cc
@@ -0,0 +1,167 @@
+#include "wx/wx.h"
+#include "wx/sizer.h"
+#include "wx/glcanvas.h"
+
+#include "basic_gl_pane.h"
+#include "image.h"
+#include "drawable.h"
+
+// include OpenGL
+#ifdef __WXMAC__
+#include "OpenGL/glu.h"
+#include "OpenGL/gl.h"
+#else
+#include <GL/glu.h>
+#include <GL/gl.h>
+#endif
+
+class MyApp: public wxApp
+{
+    virtual bool OnInit();
+
+    wxFrame *frame;
+    BasicGLPane * glPane;
+public:
+
+};
+
+IMPLEMENT_APP(MyApp)
+
+Image* image = NULL;
+DrawableThing* sprite;
+
+bool MyApp::OnInit()
+{
+    wxBoxSizer* sizer = new wxBoxSizer(wxHORIZONTAL);
+    frame = new wxFrame((wxFrame *)NULL, -1,  wxT("Hello GL World"), wxPoint(50,50), wxSize(400,200));
+
+    int args[] = {WX_GL_RGBA, WX_GL_DOUBLEBUFFER, WX_GL_DEPTH_SIZE, 16, 0};
+
+    glPane = new BasicGLPane( (wxFrame*) frame, args);
+    sizer->Add(glPane, 1, wxEXPAND);
+
+    frame->SetSizer(sizer);
+    frame->SetAutoLayout(true);
+
+    frame->Show();
+    return true;
+}
+
+BEGIN_EVENT_TABLE(BasicGLPane, wxGLCanvas)
+EVT_MOTION(BasicGLPane::mouseMoved)
+EVT_LEFT_DOWN(BasicGLPane::mouseDown)
+EVT_LEFT_UP(BasicGLPane::mouseReleased)
+EVT_RIGHT_DOWN(BasicGLPane::rightClick)
+EVT_LEAVE_WINDOW(BasicGLPane::mouseLeftWindow)
+EVT_SIZE(BasicGLPane::resized)
+EVT_KEY_DOWN(BasicGLPane::keyPressed)
+EVT_KEY_UP(BasicGLPane::keyReleased)
+EVT_MOUSEWHEEL(BasicGLPane::mouseWheelMoved)
+EVT_PAINT(BasicGLPane::render)
+END_EVENT_TABLE()
+
+
+// some useful events to use
+void BasicGLPane::mouseMoved(wxMouseEvent& event) {}
+void BasicGLPane::mouseDown(wxMouseEvent& event) {}
+void BasicGLPane::mouseWheelMoved(wxMouseEvent& event) {}
+void BasicGLPane::mouseReleased(wxMouseEvent& event) {}
+void BasicGLPane::rightClick(wxMouseEvent& event) {}
+void BasicGLPane::mouseLeftWindow(wxMouseEvent& event) {}
+void BasicGLPane::keyPressed(wxKeyEvent& event) {}
+void BasicGLPane::keyReleased(wxKeyEvent& event) {}
+
+BasicGLPane::BasicGLPane(wxFrame* parent, int* args) :
+wxGLCanvas(parent, wxID_ANY,  wxDefaultPosition, wxDefaultSize, 0, wxT("GLCanvas"),  args)
+{
+}
+
+void BasicGLPane::resized(wxSizeEvent& evt)
+{
+    wxGLCanvas::OnSize(evt);
+
+    Refresh();
+}
+
+void BasicGLPane::prepare3DViewport(int topleft_x, int topleft_y, int bottomrigth_x, int bottomrigth_y)
+{
+    /*
+     *  Inits the OpenGL viewport for drawing in 3D.
+     */
+
+    glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // Black Background
+    glClearDepth(1.0f);	// Depth Buffer Setup
+    glEnable(GL_DEPTH_TEST); // Enables Depth Testing
+    glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do
+    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
+
+    glEnable(GL_COLOR_MATERIAL);
+
+    glViewport(topleft_x, topleft_y, bottomrigth_x-topleft_x, bottomrigth_y-topleft_y);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+
+    float ratio_w_h = (float)(bottomrigth_x-topleft_x)/(float)(bottomrigth_y-topleft_y);
+    gluPerspective(45 /*view angle*/, ratio_w_h, 0.1 /*clip close*/, 200 /*clip far*/);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+
+}
+
+void BasicGLPane::prepare2DViewport(int topleft_x, int topleft_y, int bottomrigth_x, int bottomrigth_y)
+{
+
+    /*
+     *  Inits the OpenGL viewport for drawing in 2D
+     */
+
+    glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // Black Background
+    glEnable(GL_TEXTURE_2D);   // textures
+    glEnable(GL_COLOR_MATERIAL);
+    glEnable(GL_BLEND);
+    glDisable(GL_DEPTH_TEST);
+    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
+
+    glViewport(topleft_x, topleft_y, bottomrigth_x-topleft_x, bottomrigth_y-topleft_y);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+
+    gluOrtho2D(topleft_x, bottomrigth_x, bottomrigth_y, topleft_y);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+}
+
+int BasicGLPane::getWidth()
+{
+    return GetSize().x;
+}
+
+int BasicGLPane::getHeight()
+{
+    return GetSize().y;
+}
+
+void BasicGLPane::render( wxPaintEvent& evt )
+{
+    if(!IsShown()) return;
+
+    wxGLCanvas::SetCurrent();
+
+
+    if(image == NULL)
+    {
+        image = new Image( wxT("myfile.png") );
+        sprite = new DrawableThing(image);
+    }
+
+    wxPaintDC(this); // only to be used in paint events. use wxClientDC to paint outside the paint event
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    // render loaded image
+    prepare2DViewport(0,0,getWidth(), getHeight());
+    sprite->render();
+
+    glFlush();
+    SwapBuffers();
+}