gluPerspective not working - c++

Question

I use gluPerspective to mainly increase the draw distance, but it doesn't seem to work.
This is how it shows in my code:
gluPerspective(0, 70/70, 0, 4333);
ratio: The window Width and Height is both 700 and they are constant, in case of wondering.
fovy: I put 0 because, "they" say that using 45 is very nice to draw, but it stops drawing on the screen.
This is the full code:
#include <Windows.h>
#include <gl\GL.h>
#include <gl/glut.h>
WNDCLASSEX wclass;
MSG msg;
HWND hwnd;
HDC hdc;
HDC p_hdc;
float t;
int red, green, blue, x, y, z;
void update()
{
RECT rec;
GetClientRect(hwnd, &rec);
InvalidateRect(hwnd, &rec, false);
UpdateWindow(hwnd);
t += 0.5f;
}
void game()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(0, 0, 0, 0);
float norm = 1;
float z = 0;
red = 255;
green = 255;
glPushMatrix();
glRotatef(t, 0, 1, 1);
glBegin(GL_TRIANGLES);
glColor3f(255, 0, 0);
glVertex3f(-norm, norm, z);
glVertex3f(norm, norm, z);
glColor3f(0, 110, 10);
glVertex3f(-norm, -norm, z);
glEnd();
gluPerspective(45, 70/70, 0.01f, 4333);
glPopMatrix();
SwapBuffers(hdc);
}
HGLRC hrc;
LRESULT CALLBACK WinProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpstr, int nCmdShow)
{
wclass.cbSize = sizeof(WNDCLASSEX);
wclass.style = 0;
wclass.lpfnWndProc = WinProc;
wclass.cbClsExtra = 0;
wclass.cbWndExtra = 0;
wclass.hInstance = hInstance;
wclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wclass.hbrBackground = (HBRUSH) (COLOR_WINDOW);
wclass.lpszMenuName = NULL;
wclass.lpszClassName = "CLASS";
wclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&wclass))
{
MessageBox(0, "Windows Class Registration Failure Detected!\nProgram Can't Be Initialized..", "Failure Detected", MB_ICONERROR | MB_OK);
return 0;
}
hwnd = CreateWindowEx(
0, "CLASS", "OPENGL WORLD", WS_OVERLAPPEDWINDOW,
0, 0, 700, 700,
HWND_DESKTOP, NULL, hInstance, NULL
);
EnableOpenGL(hwnd, &hdc, &hrc);
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
if(hwnd == NULL)
{
MessageBox(0, "Windows Form Creation Failure..", "Failure", MB_ICONERROR | MB_OK);
}
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WinProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_CREATE:
SetTimer(hwnd, 1, 1, NULL);
break;
case WM_DESTROY:
PostQuitMessage (0);
break;
case WM_TIMER:
game();
update();
break;
case WM_PAINT:
PAINTSTRUCT ps;
HDC win;
win = BeginPaint(hwnd, &ps);
p_hdc = win;
game();
EndPaint(hwnd, &ps);
break;
default:
return DefWindowProc (hwnd, msg, wParam, lParam);
}
return 0;
}
void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC)
{
PIXELFORMATDESCRIPTOR pfd;
int iFormat;
*hDC = GetDC(hwnd);
ZeroMemory(&pfd, sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW |
PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cDepthBits = 16;
pfd.iLayerType = PFD_MAIN_PLANE;
iFormat = ChoosePixelFormat(*hDC, &pfd);
SetPixelFormat(*hDC, iFormat, &pfd);
*hRC = wglCreateContext(*hDC);
wglMakeCurrent(*hDC, *hRC);
}
What to do?
EDIT: THE NEW CODE
#include <Windows.h>
#include <gl\GL.h>
#include <gl/glut.h>
WNDCLASSEX wclass;
MSG msg;
HWND hwnd;
HDC hdc;
HDC p_hdc;
float t;
int red, green, blue, x, y, z;
float cx, cy, cz;
void handle_resize()
{
RECT rec;
GetClientRect(hwnd, &rec);
long width = rec.right - rec.left;
long height = rec.top - rec.bottom;
float aspect = (float)width/(float)height;
glViewport(0, 0, 700, 700);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45, aspect, 0.01f, 99999);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void update()
{
RECT rec;
GetClientRect(hwnd, &rec);
InvalidateRect(hwnd, &rec, false);
UpdateWindow(hwnd);
t += 0.5f;
cz = -3;
}
void game()
{
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
float norm = 1;
float z = 0;
red = 255;
green = 255;
glPushMatrix();
glRotatef(t, 0, 1, 1);
glBegin(GL_TRIANGLES);
glColor3f(255, 0, 0);
glVertex3f(-norm, norm, z);
glVertex3f(norm, norm, z);
glColor3f(0, 110, 10);
glVertex3f(-norm, -norm, z);
glEnd();
glPopMatrix();
SwapBuffers(hdc);
}
HGLRC hrc;
LRESULT CALLBACK WinProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpstr, int nCmdShow)
{
wclass.cbSize = sizeof(WNDCLASSEX);
wclass.style = 0;
wclass.lpfnWndProc = WinProc;
wclass.cbClsExtra = 0;
wclass.cbWndExtra = 0;
wclass.hInstance = hInstance;
wclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wclass.hbrBackground = (HBRUSH) (COLOR_WINDOW);
wclass.lpszMenuName = NULL;
wclass.lpszClassName = "CLASS";
wclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&wclass))
{
MessageBox(0, "Windows Class Registration Failure Detected!\nProgram Can't Be Initialized..", "Failure Detected", MB_ICONERROR | MB_OK);
return 0;
}
hwnd = CreateWindowEx(
0, "CLASS", "OPENGL WORLD", WS_OVERLAPPEDWINDOW,
0, 0, 700, 700,
HWND_DESKTOP, NULL, hInstance, NULL
);
EnableOpenGL(hwnd, &hdc, &hrc);
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
glMatrixMode(GL_PROJECTION);
glMatrixMode(GL_MODELVIEW);
if(hwnd == NULL)
{
MessageBox(0, "Windows Form Creation Failure..", "Failure", MB_ICONERROR | MB_OK);
}
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WinProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_CREATE:
SetTimer(hwnd, 1, 1, NULL);
break;
case WM_DESTROY:
PostQuitMessage (0);
break;
case WM_TIMER:
game();
update();
break;
case WM_PAINT:
PAINTSTRUCT ps;
HDC win;
win = BeginPaint(hwnd, &ps);
p_hdc = win;
game();
EndPaint(hwnd, &ps);
break;
case WM_SIZE:
handle_resize();
break;
default:
return DefWindowProc (hwnd, msg, wParam, lParam);
}
return 0;
}
void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC)
{
PIXELFORMATDESCRIPTOR pfd;
int iFormat;
*hDC = GetDC(hwnd);
ZeroMemory(&pfd, sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW |
PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cDepthBits = 16;
pfd.iLayerType = PFD_MAIN_PLANE;
iFormat = ChoosePixelFormat(*hDC, &pfd);
SetPixelFormat(*hDC, iFormat, &pfd);
*hRC = wglCreateContext(*hDC);
wglMakeCurrent(*hDC, *hRC);
}

Answer 1

gluPerspective(0, 70/70, 0, 4333);
^ nope ^ nope
fovy and zNear must both be positive and non-zero.
Try this:
gluPerspective( 45, 70/70, 0.1, 4333 );
EDIT: Push your camera back a bit too:
#include <GL/glut.h>
float t = 0;
void timer( int val )
{
t += 0.5f;
glutTimerFunc( 10, timer, 0 );
glutPostRedisplay();
}
void display()
{
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
double w = glutGet( GLUT_WINDOW_WIDTH );
double h = glutGet( GLUT_WINDOW_HEIGHT );
gluPerspective( 45, w / h, 0.1, 4333.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glTranslatef( 0, 0, -5 );
float norm = 1;
float z = 0;
glPushMatrix();
glRotatef(t, 0, 1, 1);
glBegin(GL_TRIANGLES);
glColor3f(255, 0, 0);
glVertex3f(-norm, norm, z);
glVertex3f(norm, norm, z);
glColor3f(0, 110, 10);
glVertex3f(-norm, -norm, z);
glEnd();
glPopMatrix();
glutSwapBuffers();
}
int main( int argc, char **argv )
{
glutInit( &argc, argv );
glutInitDisplayMode( GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE );
glutInitWindowSize( 640, 480 );
glutCreateWindow( "GLUT" );
glutDisplayFunc( display );
glutTimerFunc( 0, timer, 0 );
glutMainLoop();
return 0;
}

Answer 2

As-per our comments, I made a few changes to your code that are necessary to properly deal with the perspective projection matrix and window sizing. There are still a number of things about this code that I do not like, such as drawing using a timer but this should at least address the small things.
New code:
void handle_resize (void)
{
RECT rec;
GetClientRect(hwnd, &rec);
long width = rec.right - rec.left;
long height = rec.top - rec.bottom;
float aspect = (float)width/(float)height;
glViewport (0, 0, width, height);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gluPerspective (45, aspect, 0.01f, 4333);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
}
void game()
{
glClearColor(0, 0, 0, 0); // Do this first
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
float norm = 1;
float z = 0;
red = 255;
green = 255;
glMatrixMode (GL_MODELVIEW);
glPushMatrix();
glRotatef(t, 0, 1, 1);
glBegin(GL_TRIANGLES);
glColor3ub(255, 0, 0);
glVertex3f(-norm, norm, z);
glVertex3f(norm, norm, z);
glColor3ub(0, 110, 10);
glVertex3f(-norm, -norm, z);
glEnd();
//gluPerspective(45, 70/70, 0.01f, 4333); // GET THIS OUT OF HERE!!!
glPopMatrix();
SwapBuffers(hdc);
}
Changes to your window message handler:
switch (msg)
{
case WM_CREATE:
SetTimer(hwnd, 1, 1, NULL);
break;
// NEW EVENT: Handle window size change
case WM_SIZE:
handle_resize ();
break;
Other things to note:
glColor3f clamps the floating-point value to the range [0.0,1.0], you were using values of 255 which is only appropriate if you use glColor3ub, which is essentially the same thing as glColor3f (1.0f, 1.0f, 1.0f).