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/**************************
* Includes
*
**************************/
#include
#include
#include
#include "winuser.h"
#include
/**************************
* Function Declarations
*
**************************/
LRESULT CALLBACK WndProc (HWND hWnd, UINT message,
WPARAM wParam, LPARAM lParam);
void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC);
void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC);
unsigned int screentexture;
int screenwidth, screenheight;
void inittexture(void)
{
char *texture = new char[1024*1024*3];
HDC hdc;
hdc = GetDC(NULL);
for (int y = 0; y < screenheight; y++)
for (int x = 0; x < screenwidth; x++)
{
COLORREF c = GetPixel(hdc, x, y);
texture[y*1024*3 + x*3] = GetRValue(c);
texture[y*1024*3 + x*3 + 1] = GetGValue(c);
texture[y*1024*3 + x*3 + 2] = GetBValue(c);
}
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &screentexture);
glBindTexture(GL_TEXTURE_2D, screentexture);
glTexImage2D(GL_TEXTURE_2D, 0, 3, 1024, 1024, 0, GL_RGB, GL_UNSIGNED_BYTE, texture);
//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
delete[] texture;
}
float mikescale = 1.0f;
float focalpointx = 0.0;
float focalpointy = 0.0;
float focalpointvx = 0.0;
float focalpointvy = 0.0;
/**************************
* WinMain
*
**************************/
int WINAPI WinMain (HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int iCmdShow)
{
WNDCLASS wc;
HWND hWnd;
HDC hDC;
HGLRC hRC;
MSG msg;
BOOL bQuit = FALSE;
/* register window class */
wc.style = CS_OWNDC;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor (NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH) GetStockObject (BLACK_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = "GLSample";
RegisterClass (&wc);
screenwidth = GetSystemMetrics(SM_CXSCREEN);
screenheight = GetSystemMetrics(SM_CYSCREEN);
if (screenwidth > 1024 || screenheight > 1024)
{
MessageBox(NULL, "Sorry, your screen is too big. Width and height must be no greater than 1024 pixels.", "Screen too big", MB_OK);
return 1;
}
/*char string[89];
sprintf(string, "%d", screenheight);
MessageBox(NULL, string, string, MB_OK);*/
/* create main window */
hWnd = CreateWindow (
"GLSample", "OpenGL Sample",
WS_POPUPWINDOW | WS_VISIBLE,
0, 0, screenwidth, screenheight,
NULL, NULL, hInstance, NULL);
/* enable OpenGL for the window */
EnableOpenGL (hWnd, &hDC, &hRC);
ShowWindow(hWnd, SW_HIDE);
inittexture();
ShowWindow(hWnd, SW_SHOWNORMAL);
/* program main loop */
while (!bQuit)
{
/* check for messages */
if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
{
/* handle or dispatch messages */
if (msg.message == WM_QUIT)
{
bQuit = TRUE;
}
else
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
}
else
{
/* OpenGL animation code goes here */
glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
glClear (GL_COLOR_BUFFER_BIT);
float xmax = float(screenwidth)/1024.0;
float ymax = float(screenheight)/1024.0;
glPushMatrix ();
if (GetAsyncKeyState(VK_UP)) focalpointy+=0.1/mikescale;
if (GetAsyncKeyState(VK_DOWN)) focalpointy-=0.1/mikescale;
if (GetAsyncKeyState(VK_RIGHT)) focalpointx+=0.1/mikescale;
if (GetAsyncKeyState(VK_LEFT)) focalpointx-=0.1/mikescale;
focalpointx+=focalpointvx;
focalpointy+=focalpointvy;
// focalpointvx-=0.1/mikescale;
// focalpointvy-=0.1/mikescale;
if (GetAsyncKeyState(VK_LBUTTON)) {
POINT point;
GetCursorPos(&point);
float gridx = float(point.x)/float(screenwidth)*2.0-1.0;
float gridy = -(float(point.y)/float(screenheight)*2.0-1.0);
focalpointx+=gridx/mikescale/12.0;
focalpointy+=gridy/mikescale/12.0;
mikescale+=0.1;
}
if (GetAsyncKeyState(VK_RBUTTON))
{
POINT point;
GetCursorPos(&point);
float gridx = float(point.x)/float(screenwidth)*2.0-1.0;
float gridy = -(float(point.y)/float(screenheight)*2.0-1.0);
focalpointx+=gridx/mikescale/12.0;
focalpointy+=gridy/mikescale/12.0;
if (mikescale > .8) mikescale-=0.1;
}
if (focalpointx > 1.0) focalpointx=1.0;
else if (focalpointx < -1.0) focalpointx=-1.0;
if (focalpointy > 1.0) focalpointy=1.0;
else if (focalpointy < -1.0) focalpointy=-1.0;
// glScalef(mikescale, mikescale, 1);
// glTranslatef(-focalpointx/mikescale, -focalpointy/mikescale, 0);
//glTranslatef(-focalpointx, -focalpointy, 0);
//mikescale+=0.1;
glBegin (GL_QUADS);
glTexCoord2f(0, ymax);
// glVertex2f (-1*mikescale-focalpointx, -1*mikescale-focalpointy);
glVertex2f ((-1-focalpointx)*mikescale, (-1-focalpointy)*mikescale);
glTexCoord2f(xmax, ymax);
// glVertex2f (1*mikescale-focalpointx, -1*mikescale-focalpointy);
glVertex2f ((1-focalpointx)*mikescale, (-1-focalpointy)*mikescale);
glTexCoord2f(xmax, 0);
// glVertex2f (1*mikescale-focalpointx, 1*mikescale-focalpointy);
glVertex2f ((1-focalpointx)*mikescale, (1-focalpointy)*mikescale);
glTexCoord2f(0, 0);
// glVertex2f (-1*mikescale-focalpointx, 1*mikescale-focalpointy);
glVertex2f ((-1-focalpointx)*mikescale, (1-focalpointy)*mikescale);
glEnd ();
glPopMatrix ();
SwapBuffers (hDC);
Sleep (1);
}
}
/* shutdown OpenGL */
DisableOpenGL (hWnd, hDC, hRC);
/* destroy the window explicitly */
DestroyWindow (hWnd);
return msg.wParam;
}
/********************
* Window Procedure
*
********************/
LRESULT CALLBACK WndProc (HWND hWnd, UINT message,
WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
return 0;
case WM_CLOSE:
PostQuitMessage (0);
return 0;
case WM_DESTROY:
return 0;
case WM_LBUTTONDOWN:
{
int xPos = lParam & 0x0000ffff;
int yPos = lParam >> 16;
char string[80];
// float focalpointx = float(xPos)/800.0f*2.0 - 1.0;
// float focalpointy = float(yPos)/600.0f*2.0 - 1.0;
/* float gridx = float(xPos)/799.0*2.0-1.0;
float gridy = -(float(yPos)/599.0*2.0-1.0);
focalpointx+=gridx/mikescale/2;
focalpointy+=gridy/mikescale/2;
mikescale+=0.5;*/
sprintf(string, "%d %d", xPos, yPos);
// MessageBox(NULL, string, string, MB_OK);
}
return 0;
case WM_RBUTTONDOWN:
//mikescale-=0.5;
return 0;
case WM_KEYDOWN:
switch (wParam)
{
case VK_ESCAPE:
PostQuitMessage(0);
return 0;
}
return 0;
default:
return DefWindowProc (hWnd, message, wParam, lParam);
}
}
/*******************
* Enable OpenGL
*
*******************/
void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC)
{
PIXELFORMATDESCRIPTOR pfd;
int iFormat;
/* get the device context (DC) */
*hDC = GetDC (hWnd);
/* set the pixel format for the DC */
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);
/* create and enable the render context (RC) */
*hRC = wglCreateContext( *hDC );
wglMakeCurrent( *hDC, *hRC );
}
/******************
* Disable OpenGL
*
******************/
void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC)
{
wglMakeCurrent (NULL, NULL);
wglDeleteContext (hRC);
ReleaseDC (hWnd, hDC);
}
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