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#pragma comment(lib, "openGL32.lib")
#pragma comment(lib, "glu32.lib")
#pragma comment(lib, "SDL.lib")
#pragma
#ifdef _WIN32
#include <windows.h>
#endif
#include <iostream>
#include <vector>
#include <string>
#include <SDL/SDL.h>
#include <GL/gl.h>
#include <GL/glu.h>
using std::vector;
void error(const std::string& s) {
#ifdef _WIN32
MessageBox(NULL, s.c_str(), "An error occurred", MB_ICONINFORMATION | MB_OK);
#else
std::cerr << s << std::endl;
#endif
}
class SimpleApp
{
public:
static const int WINDOW_WIDTH = 1024;
static const int WINDOW_HEIGHT = 768;
SimpleApp();
bool initialize();
void resize(int x, int y);
void prepare();
void render();
};
SimpleApp::SimpleApp()
{
}
bool SimpleApp::initialize()
{
//Enable depth testing
glEnable(GL_DEPTH_TEST);
//Set up the projection matrix
resize(WINDOW_WIDTH, WINDOW_HEIGHT);
return true;
}
void SimpleApp::render()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
gluLookAt(0.0, 1.0, 6.0,
0.0, 0.0, 0.0,
0.0, 1.0, 0.0);
glBegin(GL_TRIANGLES);
//Send the vertices and colors for the triangle
glColor4f(1.0, 0.0, 0.0, 1.0);
glVertex3f(2.0, 2.5, -1.0);
glColor4f(0.0, 1.0, 0.0, 1.0);
glVertex3f(-3.5, -2.5, -1.0);
glColor4f(0.0, 0.0, 1.0, 1.0);
glVertex3f(2.0, -4.0, -1.0);
glEnd();
glBegin(GL_TRIANGLE_FAN);
//Send the vertices and colors for the pentagon
glColor4f(1.0, 1.0, 1.0, 1.0);
glVertex3f(-1.0, 2.0, 0.0);
glColor4f(1.0, 1.0, 0.0, 1.0);
glVertex3f(-3.0, -0.5, 0.0);
glColor4f(0.0, 1.0, 1.0, 1.0);
glVertex3f(-1.5, -3.0, 0.0);
glColor4f(0.0, 0.0, 0.0, 1.0);
glVertex3f(1.0, -2.0, 0.0);
glColor4f(1.0, 0.0, 1.0, 1.0);
glVertex3f(1.0, 1.0, 0.0);
glEnd();
}
void SimpleApp::resize(int w, int h)
{
//Prevent a divide by zero error
if (h <= 0)
{
h = 1;
}
//When we resize the window, we tell OpenGL about the new viewport size
glViewport(0, 0, (GLsizei)w, (GLsizei)h);
glMatrixMode(GL_PROJECTION); //deprecated
glLoadIdentity();
//Then we set up our projection matrix with the correct aspect ratio
gluPerspective(60.0f, float(w) / float(h), 1.0f, 100.0f); //deprecated
glMatrixMode(GL_MODELVIEW); //deprecated
glLoadIdentity(); //deprecated
}
int main(int argc, char** argv)
{
SimpleApp myApp;
if ( SDL_Init( SDL_INIT_VIDEO ) != 0 )
{
std::cerr << "Could not initialize SDL" << std::endl;
return false;
}
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
std::string title = "BOGLGP Chapter 1";
SDL_WM_SetCaption(title.c_str(), title.c_str());
// Create the window
if (!SDL_SetVideoMode(SimpleApp::WINDOW_WIDTH, SimpleApp::WINDOW_HEIGHT, 0, SDL_OPENGL | SDL_RESIZABLE))
{
std::cerr << "Could not create the window" << std::endl;
return false;
}
if (!myApp.initialize())
{
SDL_Quit();
return 1;
}
bool done = false;
while (!done)
{
SDL_Event event;
while (SDL_PollEvent(&event))
{
switch(event.type) {
case SDL_QUIT:
done = true;
break;
case SDL_VIDEORESIZE:
myApp.resize(event.resize.w, event.resize.h);
break;
case SDL_KEYDOWN:
if (event.key.keysym.sym == SDLK_ESCAPE) {
done = true;
}
break;
default:
break;
}
}
myApp.render();
SDL_GL_SwapBuffers();
}
SDL_Quit();
return 0;
}
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