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/*
* Original Author: Leo Chan -- 1995
*
* Adam King 1997
* Ported to Win32 from X
*
* Ron Cemer 1999
* Ported to MS Java VM, which supports JDirect instead of JNI
*
* This file takes care of the C implementation of finding the correct
* Win32 window, assigning an OpenGL graphics context to it, storing that
* graphics context in the java class data structure.
*
* also contains the use() and swap() functions for double buffering
*
* September 12, 1997 - Adam King
* - Added support for rendering directly into a Canvas ( BIG rewrite )
*
* Currently, only the windows special overlapping window procs are
* implemented here !
*
* The other procs are implemented with JNI !
*/
#include "OpenGL_misc.h"
#define CLASS_NAME "GL4JavaOglRenderingWindowClass"
#define WINDOW_NAME "GL4JavaOglRenderingWindow"
#define MAX_WINDOWS 1024
static int verbose = 0;
static LONG classregistered = 0;
static LRESULT CALLBACK CallWndProc(int nCode,WPARAM wParam,LPARAM lParam);
static LRESULT CALLBACK CallWndRetProc(int nCode,WPARAM wParam,LPARAM lParam);
BOOL APIENTRY DllMain
(HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
/* Initialize various things the first time
that we attach this DLL to a process. */
if (InterlockedIncrement(&classregistered) == 1)
{
WNDCLASS wndclass;
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
wndclass.style = CS_GLOBALCLASS | CS_SAVEBITS;
wndclass.lpfnWndProc = (WNDPROC)WindowProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hModule;
wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(LTGRAY_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = CLASS_NAME;
RegisterClass(&wndclass);
}
else
InterlockedDecrement(&classregistered);
break;
case DLL_PROCESS_DETACH:
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
}
return TRUE;
} /* DllMain() */
// Select the pixel format for a given device context
static LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
return DefWindowProc(hwnd,uMsg,wParam,lParam);
} /* WindowProc() */
__declspec(dllexport) void OGLWindowMsgPumpJDirect(void)
{
MSG msg;
while (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
} /* OGLWindowMsgPumpJDirect() */
__declspec(dllexport) void moveOGLWindowNativeJDirect(long _hdc, int x, int y, int width, int height)
{
HWND hwnd, hwndParent;
HDC hdc = (HDC)((PointerHolder)_hdc);
RECT rect;
int parentx = 0, parenty = 0;
int insetsleft = 0, insetstop = 0;
if (hdc != NULL)
{
if ((hwnd = WindowFromDC(hdc)) != NULL)
{
if ((hwndParent = GetParent(hwnd)) != NULL)
{
GetWindowRect(hwndParent,&rect);
parentx = rect.left;
parenty = rect.top;
}
else
parentx = parenty = 0;
MoveWindow(hwnd,x-parentx,y-parenty,width,height,TRUE);
GetWindowRect(hwnd,&rect);
insetsleft = rect.left-x;
insetstop = rect.top-y;
if ( (insetsleft) || (insetstop) )
MoveWindow(hwnd,x-(parentx+insetsleft),y-(parenty+insetstop),width,height,TRUE);
}
}
} /* moveOGLWindowNativeJDirect() */
__declspec(dllexport) long createOGLWindowNativeJDirect(long hwndParent, int x, int y, int width, int height)
{
HWND hwnd;
HDC hdc;
if ((hwnd = CreateWindow
(CLASS_NAME,
WINDOW_NAME,
WS_CHILD | WS_VISIBLE | WS_DISABLED,
x,
y,
width,
height,
(HWND)((PointerHolder)hwndParent),
NULL,
NULL,
NULL)) == NULL)
{
fprintf(stderr,"createOGLWindowNativeJDirect(): CreateWindow failed!\n");
fprintf(stderr,"GetLastError() returns: %d\n",(int)GetLastError());
return(0);
}
hdc = GetDC(hwnd);
moveOGLWindowNativeJDirect((long)((PointerHolder)hdc), x, y, width, height);
return (long)((PointerHolder)hdc);
} /* createOGLWindowNativeJDirect() */
__declspec(dllexport) void destroyOGLWindowNativeJDirect(long _hdc)
{
HWND hwnd;
HDC hdc = (HDC)((PointerHolder)_hdc);
if (hdc != NULL)
{
if ((hwnd = WindowFromDC(hdc)) != NULL)
{
ReleaseDC(hwnd,hdc);
DestroyWindow(hwnd);
}
}
} /* destroyOGLWindowNativeJDirect() */
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