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#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, char_to_wx("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, char_to_wx("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(char_to_wx("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();
}
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