#ifdef _WIN32
#pragma comment(lib, "glu32.lib")
#pragma comment(lib, "opengl32.lib")
#pragma comment(lib, "SDL.lib")
#pragma comment(lib, "SDLmain.lib")
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#endif
#include <GL/gl.h>
#include <GL/glu.h>
#include "SDL.h"
#include <cstdlib>
#include <cstddef>
#include <iostream>
const int width = 800;
const int height = 800;
const int bpp = 32;
const float fov = 45.0f;
const float nClip = 1.0f;
const float fClip = 500.0f;
void Draw();
bool CheckInput();
void SetOrthoProj();
void ResetPersProj();
void CheckGLErrors();
int main(int argc, char** argv)
{
if(SDL_InitSubSystem(SDL_INIT_VIDEO) == -1 || SDL_SetVideoMode(width, height, bpp, SDL_OPENGL) == 0)
{
SDL_Quit();
std::cerr << "Initialization has failed, exiting." << std::endl;
return -1;
}
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
gluPerspective(fov, float(width)/float(height), nClip, fClip);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glPointSize(10);
while(CheckInput() == true)
{
Draw();
CheckGLErrors();
SDL_GL_SwapBuffers();
}
SDL_Quit();
return 0;
}
void Draw()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
SetOrthoProj();
glEnableClientState(GL_COLOR_ARRAY);
glEnableClientState(GL_VERTEX_ARRAY);
static GLint tempa[] = { 0, 0,
100, 100,
0, 100};
static GLfloat tempb[] = { 1, 0, 0,
0, 1, 0,
0, 0, 1};
glVertexPointer(2, GL_INT, 0, tempa);
glColorPointer(3, GL_FLOAT, 0, tempb);
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
glBegin(GL_POINTS);
glColor3fv(tempb+0); glVertex2iv(tempa+0);
glColor3fv(tempb+3); glVertex2iv(tempa+2);
glColor3fv(tempb+6); glVertex2iv(tempa+4);
glEnd();
ResetPersProj();
}
bool CheckInput()
{
static SDL_Event event;
while(SDL_PollEvent(&event))
{
if((event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_ESCAPE) || event.type == SDL_QUIT) return false;
}
return true;
}
void SetOrthoProj()
{
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrtho(0, double(width), 0, double(height), -1, 1);
glMatrixMode(GL_MODELVIEW);
}
void ResetPersProj()
{
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
}
void CheckGLErrors()
{
static GLenum error;
error = glGetError();
if(error != GL_NO_ERROR)
{
std::cerr << "* OpenGL Error: " << gluErrorString(error) << std::endl;
}
}
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