X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/7e42f2f863e7fa64d5c2240324efe3eaf165328e..211cc8dc907ee50ca6d383b8df16bba9a4d3ce2d:/src/msw/glcanvas.cpp diff --git a/src/msw/glcanvas.cpp b/src/msw/glcanvas.cpp index f415d6030a..360e36c876 100644 --- a/src/msw/glcanvas.cpp +++ b/src/msw/glcanvas.cpp @@ -49,7 +49,7 @@ wxGLContext::wxGLContext(bool isRGB, wxGLCanvas *win, const wxPalette& palette) m_hDC = win->GetHDC(); m_glContext = wglCreateContext((HDC) m_hDC); - wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" ); + wxCHECK_RET( m_glContext, wxT("Couldn't create OpenGl context") ); wglMakeCurrent((HDC) m_hDC, m_glContext); } @@ -57,20 +57,20 @@ wxGLContext::wxGLContext(bool isRGB, wxGLCanvas *win, const wxPalette& palette) wxGLContext::wxGLContext( bool isRGB, wxGLCanvas *win, const wxPalette& palette, - const wxGLContext *other /* for sharing display lists */ -) + const wxGLContext *other /* for sharing display lists */ + ) { - m_window = win; + m_window = win; - m_hDC = win->GetHDC(); + m_hDC = win->GetHDC(); - m_glContext = wglCreateContext((HDC) m_hDC); - wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" ); + m_glContext = wglCreateContext((HDC) m_hDC); + wxCHECK_RET( m_glContext, wxT("Couldn't create OpenGl context") ); - if( other != 0 ) - wglShareLists( other->m_glContext, m_glContext ); + if( other != 0 ) + wglShareLists( other->m_glContext, m_glContext ); - wglMakeCurrent((HDC) m_hDC, m_glContext); + wglMakeCurrent((HDC) m_hDC, m_glContext); } wxGLContext::~wxGLContext() @@ -78,7 +78,7 @@ wxGLContext::~wxGLContext() if (m_glContext) { wglMakeCurrent(NULL, NULL); - wglDeleteContext(m_glContext); + wglDeleteContext(m_glContext); } } @@ -98,10 +98,10 @@ void wxGLContext::SetCurrent() wglMakeCurrent((HDC) m_hDC, m_glContext); } -/* - setupPixelFormat(hDC); - setupPalette(hDC); -*/ + /* + setupPixelFormat(hDC); + setupPalette(hDC); + */ } void wxGLContext::SetColour(const char *colour) @@ -134,25 +134,24 @@ END_EVENT_TABLE() wxGLCanvas::wxGLCanvas(wxWindow *parent, wxWindowID id, const wxPoint& pos, const wxSize& size, long style, const wxString& name, - int *attribList /* not used yet! */, const wxPalette& palette): - wxScrolledWindow() + int *attribList, const wxPalette& palette) : wxScrolledWindow() { - m_glContext = (wxGLContext*) NULL; + m_glContext = (wxGLContext*) NULL; - bool ret = Create(parent, id, pos, size, style, name); + bool ret = Create(parent, id, pos, size, style, name); - if ( ret ) - { - SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE)); - SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT)); - } + if ( ret ) + { + SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE)); + SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT)); + } - m_hDC = (WXHDC) ::GetDC((HWND) GetHWND()); + m_hDC = (WXHDC) ::GetDC((HWND) GetHWND()); - SetupPixelFormat(); - SetupPalette(palette); + SetupPixelFormat(attribList); + SetupPalette(palette); - m_glContext = new wxGLContext(TRUE, this, palette); + m_glContext = new wxGLContext(TRUE, this, palette); } wxGLCanvas::wxGLCanvas( wxWindow *parent, @@ -161,49 +160,49 @@ wxGLCanvas::wxGLCanvas( wxWindow *parent, int *attribList, const wxPalette& palette ) : wxScrolledWindow() { - m_glContext = (wxGLContext*) NULL; + m_glContext = (wxGLContext*) NULL; - bool ret = Create(parent, id, pos, size, style, name); + bool ret = Create(parent, id, pos, size, style, name); - if ( ret ) - { - SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE)); - SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT)); - } + if ( ret ) + { + SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE)); + SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT)); + } - m_hDC = (WXHDC) ::GetDC((HWND) GetHWND()); + m_hDC = (WXHDC) ::GetDC((HWND) GetHWND()); - SetupPixelFormat(); - SetupPalette(palette); + SetupPixelFormat(attribList); + SetupPalette(palette); - m_glContext = new wxGLContext(TRUE, this, palette, shared ); + m_glContext = new wxGLContext(TRUE, this, palette, shared ); } -// Not very usefull for wxMSW, but this is to be wxGTK compliant +// Not very useful for wxMSW, but this is to be wxGTK compliant wxGLCanvas::wxGLCanvas( wxWindow *parent, const wxGLCanvas *shared, wxWindowID id, const wxPoint& pos, const wxSize& size, long style, const wxString& name, int *attribList, const wxPalette& palette ): wxScrolledWindow() { - m_glContext = (wxGLContext*) NULL; + m_glContext = (wxGLContext*) NULL; - bool ret = Create(parent, id, pos, size, style, name); + bool ret = Create(parent, id, pos, size, style, name); - if ( ret ) - { - SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE)); - SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT)); - } + if ( ret ) + { + SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE)); + SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT)); + } - m_hDC = (WXHDC) ::GetDC((HWND) GetHWND()); + m_hDC = (WXHDC) ::GetDC((HWND) GetHWND()); - SetupPixelFormat(); - SetupPalette(palette); + SetupPixelFormat(attribList); + SetupPalette(palette); - wxGLContext *sharedContext=0; - if (shared) sharedContext=shared->GetContext(); - m_glContext = new wxGLContext(TRUE, this, palette, sharedContext ); + wxGLContext *sharedContext=0; + if (shared) sharedContext=shared->GetContext(); + m_glContext = new wxGLContext(TRUE, this, palette, sharedContext ); } wxGLCanvas::~wxGLCanvas() @@ -218,138 +217,231 @@ wxGLCanvas::~wxGLCanvas() bool wxGLCanvas::Create(wxWindow *parent, wxWindowID id, const wxPoint& pos, const wxSize& size, long style, const wxString& name) { - static bool registeredGLCanvasClass = FALSE; + /* + Suggestion from Kelly Brock (not yet implemented): - // We have to register a special window class because we need - // the CS_OWNDC style for GLCanvas. + OpenGL corruption fix is simple assuming it doesn't screw anything else + up. Add the following line to the top of the create function: + + wxSize parentSize = GetClientSize(); -/* - From Angel Popov + All locations within the function that use 'size' are changed to + 'parentSize'. + The above corrects the initial display corruption with the GeForce and + TNT2, not sure about other NVidia cards yet. + */ - Here are two snips from a dicussion in the OpenGL Gamedev list that explains - how this problem can be fixed: + static bool registeredGLCanvasClass = FALSE; - "There are 5 common DCs available in Win95. These are aquired when you call - GetDC or GetDCEx from a window that does _not_ have the OWNDC flag. - OWNDC flagged windows do not get their DC from the common DC pool, the issue - is they require 800 bytes each from the limited 64Kb local heap for GDI." + // We have to register a special window class because we need + // the CS_OWNDC style for GLCanvas. - "The deal is, if you hold onto one of the 5 shared DC's too long (as GL apps - do), Win95 will actually "steal" it from you. MakeCurrent fails, - apparently, because Windows re-assigns the HDC to a different window. The - only way to prevent this, the only reliable means, is to set CS_OWNDC." -*/ + /* + From Angel Popov - if (!registeredGLCanvasClass) - { - WNDCLASS wndclass; - - static const long styleNormal = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS | CS_OWNDC; - - // the fields which are common to all classes - wndclass.lpfnWndProc = (WNDPROC)wxWndProc; - wndclass.cbClsExtra = 0; - wndclass.cbWndExtra = sizeof( DWORD ); // VZ: what is this DWORD used for? - wndclass.hInstance = wxhInstance; - wndclass.hIcon = (HICON) NULL; - wndclass.hCursor = ::LoadCursor((HINSTANCE)NULL, IDC_ARROW); - wndclass.lpszMenuName = NULL; - - // Register the GLCanvas class name - wndclass.hbrBackground = (HBRUSH)NULL; - wndclass.lpszClassName = wxGLCanvasClassName; - wndclass.style = styleNormal; - - if ( !RegisterClass(&wndclass) ) - { - wxLogLastError("RegisterClass(wxGLCanvasClass)"); - - return FALSE; - } - registeredGLCanvasClass = TRUE; - } + Here are two snips from a dicussion in the OpenGL Gamedev list that explains + how this problem can be fixed: - wxCHECK_MSG( parent, FALSE, wxT("can't create wxWindow without parent") ); + "There are 5 common DCs available in Win95. These are aquired when you call + GetDC or GetDCEx from a window that does _not_ have the OWNDC flag. + OWNDC flagged windows do not get their DC from the common DC pool, the issue + is they require 800 bytes each from the limited 64Kb local heap for GDI." - if ( !CreateBase(parent, id, pos, size, style, wxDefaultValidator, name) ) - return FALSE; + "The deal is, if you hold onto one of the 5 shared DC's too long (as GL apps + do), Win95 will actually "steal" it from you. MakeCurrent fails, + apparently, because Windows re-assigns the HDC to a different window. The + only way to prevent this, the only reliable means, is to set CS_OWNDC." + */ - parent->AddChild(this); + if (!registeredGLCanvasClass) + { + WNDCLASS wndclass; - DWORD msflags = 0; - if ( style & wxBORDER ) - msflags |= WS_BORDER; - if ( style & wxTHICK_FRAME ) - msflags |= WS_THICKFRAME; + static const long styleNormal = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS | CS_OWNDC; - msflags |= WS_CHILD | WS_VISIBLE; - if ( style & wxCLIP_CHILDREN ) - msflags |= WS_CLIPCHILDREN; + // the fields which are common to all classes + wndclass.lpfnWndProc = (WNDPROC)wxWndProc; + wndclass.cbClsExtra = 0; + wndclass.cbWndExtra = sizeof( DWORD ); // VZ: what is this DWORD used for? + wndclass.hInstance = wxhInstance; + wndclass.hIcon = (HICON) NULL; + wndclass.hCursor = ::LoadCursor((HINSTANCE)NULL, IDC_ARROW); + wndclass.lpszMenuName = NULL; - bool want3D; - WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D); + // Register the GLCanvas class name + wndclass.hbrBackground = (HBRUSH)NULL; + wndclass.lpszClassName = wxGLCanvasClassName; + wndclass.style = styleNormal; - // Even with extended styles, need to combine with WS_BORDER - // for them to look right. - if ( want3D || (m_windowStyle & wxSIMPLE_BORDER) || (m_windowStyle & wxRAISED_BORDER ) || - (m_windowStyle & wxSUNKEN_BORDER) || (m_windowStyle & wxDOUBLE_BORDER)) + if ( !RegisterClass(&wndclass) ) { - msflags |= WS_BORDER; + wxLogLastError(wxT("RegisterClass(wxGLCanvasClass)")); + return FALSE; } - // calculate the value to return from WM_GETDLGCODE handler - if ( GetWindowStyleFlag() & wxWANTS_CHARS ) - { - // want everything: i.e. all keys and WM_CHAR message - m_lDlgCode = DLGC_WANTARROWS | DLGC_WANTCHARS | - DLGC_WANTTAB | DLGC_WANTMESSAGE; - } + registeredGLCanvasClass = TRUE; + } - MSWCreate(m_windowId, parent, wxGLCanvasClassName, this, NULL, - pos.x, pos.y, - WidthDefault(size.x), HeightDefault(size.y), - msflags, NULL, exStyle); - - return TRUE; - -} - -void wxGLCanvas::SetupPixelFormat() // (HDC hDC) -{ - PIXELFORMATDESCRIPTOR pfd = { - sizeof(PIXELFORMATDESCRIPTOR), /* size */ - 1, /* version */ - PFD_SUPPORT_OPENGL | - PFD_DRAW_TO_WINDOW | - PFD_DOUBLEBUFFER, /* support double-buffering */ - PFD_TYPE_RGBA, /* color type */ - 16, /* prefered color depth */ - 0, 0, 0, 0, 0, 0, /* color bits (ignored) */ - 0, /* no alpha buffer */ - 0, /* alpha bits (ignored) */ - 0, /* no accumulation buffer */ - 0, 0, 0, 0, /* accum bits (ignored) */ - 16, /* depth buffer */ - 0, /* no stencil buffer */ - 0, /* no auxiliary buffers */ - PFD_MAIN_PLANE, /* main layer */ - 0, /* reserved */ - 0, 0, 0, /* no layer, visible, damage masks */ - }; - int pixelFormat; - - pixelFormat = ChoosePixelFormat((HDC) m_hDC, &pfd); - if (pixelFormat == 0) { - MessageBox(WindowFromDC((HDC) m_hDC), "ChoosePixelFormat failed.", "Error", - MB_ICONERROR | MB_OK); - exit(1); - } + wxCHECK_MSG( parent, FALSE, wxT("can't create wxWindow without parent") ); + + if ( !CreateBase(parent, id, pos, size, style, wxDefaultValidator, name) ) + return FALSE; + + parent->AddChild(this); + + DWORD msflags = 0; + if ( style & wxBORDER ) + msflags |= WS_BORDER; + if ( style & wxTHICK_FRAME ) + msflags |= WS_THICKFRAME; + + /* + A general rule with OpenGL and Win32 is that any window that will have a + HGLRC built for it must have two flags: WS_CLIPCHILDREN & WS_CLIPSIBLINGS. + You can find references about this within the knowledge base and most OpenGL + books that contain the wgl function descriptions. + */ + + msflags |= WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS; + // if ( style & wxCLIP_CHILDREN ) + // msflags |= WS_CLIPCHILDREN; + msflags |= WS_CLIPCHILDREN; - if (SetPixelFormat((HDC) m_hDC, pixelFormat, &pfd) != TRUE) { - MessageBox(WindowFromDC((HDC) m_hDC), "SetPixelFormat failed.", "Error", - MB_ICONERROR | MB_OK); - exit(1); + bool want3D; + WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D); + + // Even with extended styles, need to combine with WS_BORDER + // for them to look right. + if ( want3D || (m_windowStyle & wxSIMPLE_BORDER) || (m_windowStyle & wxRAISED_BORDER ) || + (m_windowStyle & wxSUNKEN_BORDER) || (m_windowStyle & wxDOUBLE_BORDER)) + { + msflags |= WS_BORDER; + } + + // calculate the value to return from WM_GETDLGCODE handler + if ( GetWindowStyleFlag() & wxWANTS_CHARS ) + { + // want everything: i.e. all keys and WM_CHAR message + m_lDlgCode = DLGC_WANTARROWS | DLGC_WANTCHARS | + DLGC_WANTTAB | DLGC_WANTMESSAGE; + } + + MSWCreate(m_windowId, parent, wxGLCanvasClassName, this, NULL, + pos.x, pos.y, + WidthDefault(size.x), HeightDefault(size.y), + msflags, NULL, exStyle); + + return TRUE; +} + +void wxGLCanvas::SetupPixelFormat(int *attribList) // (HDC hDC) +{ + int pixelFormat; + PIXELFORMATDESCRIPTOR pfd = { + sizeof(PIXELFORMATDESCRIPTOR), /* size */ + 1, /* version */ + PFD_SUPPORT_OPENGL | + PFD_DRAW_TO_WINDOW | + PFD_DOUBLEBUFFER, /* support double-buffering */ + PFD_TYPE_RGBA, /* color type */ + 16, /* prefered color depth */ + 0, 0, 0, 0, 0, 0, /* color bits (ignored) */ + 0, /* no alpha buffer */ + 0, /* alpha bits (ignored) */ + 0, /* no accumulation buffer */ + 0, 0, 0, 0, /* accum bits (ignored) */ + 16, /* depth buffer */ + 0, /* no stencil buffer */ + 0, /* no auxiliary buffers */ + PFD_MAIN_PLANE, /* main layer */ + 0, /* reserved */ + 0, 0, 0, /* no layer, visible, damage masks */ + }; + + if (attribList) { + pfd.dwFlags &= ~PFD_DOUBLEBUFFER; + pfd.iPixelType = PFD_TYPE_COLORINDEX; + pfd.cColorBits = 0; + int arg=0; + + while( (attribList[arg]!=0) ) + { + switch( attribList[arg++] ) + { + case WX_GL_RGBA: + pfd.iPixelType = PFD_TYPE_RGBA; + break; + case WX_GL_BUFFER_SIZE: + pfd.cColorBits = attribList[arg++]; + break; + case WX_GL_LEVEL: + // this member looks like it may be obsolete + if (attribList[arg] > 0) { + pfd.iLayerType = PFD_OVERLAY_PLANE; + } else if (attribList[arg] < 0) { + pfd.iLayerType = PFD_UNDERLAY_PLANE; + } else { + pfd.iLayerType = PFD_MAIN_PLANE; + } + arg++; + break; + case WX_GL_DOUBLEBUFFER: + pfd.dwFlags |= PFD_DOUBLEBUFFER; + break; + case WX_GL_STEREO: + pfd.dwFlags |= PFD_STEREO; + break; + case WX_GL_AUX_BUFFERS: + pfd.cAuxBuffers = attribList[arg++]; + break; + case WX_GL_MIN_RED: + pfd.cColorBits += (pfd.cRedBits = attribList[arg++]); + break; + case WX_GL_MIN_GREEN: + pfd.cColorBits += (pfd.cGreenBits = attribList[arg++]); + break; + case WX_GL_MIN_BLUE: + pfd.cColorBits += (pfd.cBlueBits = attribList[arg++]); + break; + case WX_GL_MIN_ALPHA: + // doesn't count in cColorBits + pfd.cAlphaBits = attribList[arg++]; + break; + case WX_GL_DEPTH_SIZE: + pfd.cDepthBits = attribList[arg++]; + break; + case WX_GL_STENCIL_SIZE: + pfd.cStencilBits = attribList[arg++]; + break; + case WX_GL_MIN_ACCUM_RED: + pfd.cAccumBits += (pfd.cAccumRedBits = attribList[arg++]); + break; + case WX_GL_MIN_ACCUM_GREEN: + pfd.cAccumBits += (pfd.cAccumGreenBits = attribList[arg++]); + break; + case WX_GL_MIN_ACCUM_BLUE: + pfd.cAccumBits += (pfd.cAccumBlueBits = attribList[arg++]); + break; + case WX_GL_MIN_ACCUM_ALPHA: + pfd.cAccumBits += (pfd.cAccumAlphaBits = attribList[arg++]); + break; + default: + break; + } } + } + pixelFormat = ChoosePixelFormat((HDC) m_hDC, &pfd); + if (pixelFormat == 0) { + MessageBox(WindowFromDC((HDC) m_hDC), wxT("ChoosePixelFormat failed."), wxT("Error"), + MB_ICONERROR | MB_OK); + exit(1); + } + + if (SetPixelFormat((HDC) m_hDC, pixelFormat, &pfd) != TRUE) { + MessageBox(WindowFromDC((HDC) m_hDC), wxT("SetPixelFormat failed."), wxT("Error"), + MB_ICONERROR | MB_OK); + exit(1); + } } void wxGLCanvas::SetupPalette(const wxPalette& palette) @@ -389,7 +481,7 @@ wxPalette wxGLCanvas::CreateDefaultPalette() DescribePixelFormat((HDC) m_hDC, pixelFormat, sizeof(PIXELFORMATDESCRIPTOR), &pfd); - paletteSize = 1 << pfd.cColorBits; + paletteSize = 1 << pfd.cColorBits; LOGPALETTE* pPal = (LOGPALETTE*) malloc(sizeof(LOGPALETTE) + paletteSize * sizeof(PALETTEENTRY)); @@ -464,30 +556,30 @@ void wxGLCanvas::SetColour(const char *colour) // So we need wxFrame to call OnQueryNewPalette for all children... void wxGLCanvas::OnQueryNewPalette(wxQueryNewPaletteEvent& event) { - /* realize palette if this is the current window */ - if ( GetPalette()->Ok() ) { - ::UnrealizeObject((HPALETTE) GetPalette()->GetHPALETTE()); - ::SelectPalette((HDC) GetHDC(), (HPALETTE) GetPalette()->GetHPALETTE(), FALSE); - ::RealizePalette((HDC) GetHDC()); - Refresh(); - event.SetPaletteRealized(TRUE); - } - else - event.SetPaletteRealized(FALSE); + /* realize palette if this is the current window */ + if ( GetPalette()->Ok() ) { + ::UnrealizeObject((HPALETTE) GetPalette()->GetHPALETTE()); + ::SelectPalette((HDC) GetHDC(), (HPALETTE) GetPalette()->GetHPALETTE(), FALSE); + ::RealizePalette((HDC) GetHDC()); + Refresh(); + event.SetPaletteRealized(TRUE); + } + else + event.SetPaletteRealized(FALSE); } // I think this doesn't have to be propagated to child windows. void wxGLCanvas::OnPaletteChanged(wxPaletteChangedEvent& event) { - /* realize palette if this is *not* the current window */ - if ( GetPalette() && + /* realize palette if this is *not* the current window */ + if ( GetPalette() && GetPalette()->Ok() && (this != event.GetChangedWindow()) ) - { - ::UnrealizeObject((HPALETTE) GetPalette()->GetHPALETTE()); - ::SelectPalette((HDC) GetHDC(), (HPALETTE) GetPalette()->GetHPALETTE(), FALSE); - ::RealizePalette((HDC) GetHDC()); - Refresh(); - } + { + ::UnrealizeObject((HPALETTE) GetPalette()->GetHPALETTE()); + ::SelectPalette((HDC) GetHDC(), (HPALETTE) GetPalette()->GetHPALETTE(), FALSE); + ::RealizePalette((HDC) GetHDC()); + Refresh(); + } } /* Give extensions proper function names. */ @@ -531,15 +623,15 @@ void glIndexPointerEXT(GLenum type, GLsizei stride, GLsizei count, const GLvoid void glNormalPointerEXT(GLenum type, GLsizei stride, GLsizei count, const GLvoid *pointer) { #ifdef GL_EXT_vertex_array - static PFNGLNORMALPOINTEREXTPROC proc = 0; + static PFNGLNORMALPOINTEREXTPROC proc = 0; - if ( !proc ) - { - proc = (PFNGLNORMALPOINTEREXTPROC) wglGetProcAddress("glNormalPointerEXT"); - } + if ( !proc ) + { + proc = (PFNGLNORMALPOINTEREXTPROC) wglGetProcAddress("glNormalPointerEXT"); + } - if ( proc ) - (* proc) (type, stride, count, pointer); + if ( proc ) + (* proc) (type, stride, count, pointer); #endif } @@ -550,15 +642,14 @@ void glTexCoordPointerEXT(GLint size, GLenum type, GLsizei stride, GLsizei count void glVertexPointerEXT(GLint size, GLenum type, GLsizei stride, GLsizei count, const GLvoid *pointer) { #ifdef GL_EXT_vertex_array - static PFNGLVERTEXPOINTEREXTPROC proc = 0; - - if ( !proc ) - { - proc = (PFNGLVERTEXPOINTEREXTPROC) wglGetProcAddress("glVertexPointerEXT"); - } + static PFNGLVERTEXPOINTEREXTPROC proc = 0; - if ( proc ) - (* proc) (size, type, stride, count, pointer); + if ( !proc ) + { + proc = (PFNGLVERTEXPOINTEREXTPROC) wglGetProcAddress("glVertexPointerEXT"); + } + if ( proc ) + (* proc) (size, type, stride, count, pointer); #endif }