#define WXUNUSED_WITHOUT_GL_EXT_vertex_array(name) WXUNUSED(name)
#endif
+// ----------------------------------------------------------------------------
+// define possibly missing WGL constants
+// ----------------------------------------------------------------------------
+
+#ifndef WGL_ARB_pixel_format
+#define WGL_DRAW_TO_WINDOW_ARB 0x2001
+#define WGL_ACCELERATION_ARB 0x2003
+#define WGL_NUMBER_OVERLAYS_ARB 0x2008
+#define WGL_NUMBER_UNDERLAYS_ARB 0x2009
+#define WGL_SUPPORT_OPENGL_ARB 0x2010
+#define WGL_DOUBLE_BUFFER_ARB 0x2011
+#define WGL_STEREO_ARB 0x2012
+#define WGL_COLOR_BITS_ARB 0x2014
+#define WGL_RED_BITS_ARB 0x2015
+#define WGL_GREEN_BITS_ARB 0x2017
+#define WGL_BLUE_BITS_ARB 0x2019
+#define WGL_ALPHA_BITS_ARB 0x201B
+#define WGL_ACCUM_RED_BITS_ARB 0x201E
+#define WGL_ACCUM_GREEN_BITS_ARB 0x201F
+#define WGL_ACCUM_BLUE_BITS_ARB 0x2020
+#define WGL_ACCUM_ALPHA_BITS_ARB 0x2021
+#define WGL_DEPTH_BITS_ARB 0x2022
+#define WGL_STENCIL_BITS_ARB 0x2023
+#define WGL_AUX_BUFFERS_ARB 0x2024
+#define WGL_FULL_ACCELERATION_ARB 0x2027
+#endif
+
+#ifndef WGL_ARB_multisample
+#define WGL_SAMPLE_BUFFERS_ARB 0x2041
+#define WGL_SAMPLES_ARB 0x2042
+#endif
+
// ----------------------------------------------------------------------------
// libraries
// ----------------------------------------------------------------------------
// wxGLCanvas construction
// ----------------------------------------------------------------------------
+static int ChoosePixelFormatARB(HDC hdc, const int *attribList);
+
void wxGLCanvas::Init()
{
#if WXWIN_COMPATIBILITY_2_8
wxGLCanvas::~wxGLCanvas()
{
-#if WXWIN_COMPATIBILITY_2_8
- delete m_glContext;
-#endif
-
::ReleaseDC(GetHwnd(), m_hDC);
}
// Replaces wxWindow::Create functionality, since we need to use a different
// window class
-bool wxGLCanvas::Create(wxWindow *parent,
- wxWindowID id,
- const wxPoint& pos,
- const wxSize& size,
- long style,
- const wxString& name,
- const int *attribList,
- const wxPalette& palette)
+bool wxGLCanvas::CreateWindow(wxWindow *parent,
+ wxWindowID id,
+ const wxPoint& pos,
+ const wxSize& size,
+ long style,
+ const wxString& name)
{
wxCHECK_MSG( parent, false, wxT("can't create wxWindow without parent") );
if ( !m_hDC )
return false;
- if ( !DoSetup(attribList) )
+ return true;
+}
+
+bool wxGLCanvas::Create(wxWindow *parent,
+ wxWindowID id,
+ const wxPoint& pos,
+ const wxSize& size,
+ long style,
+ const wxString& name,
+ const int *attribList,
+ const wxPalette& palette)
+{
+ // Create the window first: we will either use it as is or use it to query
+ // for multisampling support and recreate it later with another pixel format
+ if ( !CreateWindow(parent, id, pos, size, style, name) )
return false;
+ PIXELFORMATDESCRIPTOR pfd;
+ const int setupVal = DoSetup(pfd, attribList);
+ if ( setupVal == 0 ) // PixelFormat error
+ return false;
+
+ if ( setupVal == -1 ) // FSAA requested
+ {
+ // now that we have a valid OpenGL window, query it for FSAA support
+ int pixelFormat;
+ {
+ wxGLContext ctx(this);
+ ctx.SetCurrent(*this);
+ pixelFormat = ::ChoosePixelFormatARB(m_hDC, attribList);
+ }
+
+ if ( pixelFormat > 0 )
+ {
+ // from http://msdn.microsoft.com/en-us/library/ms537559(VS.85).aspx:
+ //
+ // Setting the pixel format of a window more than once can
+ // lead to significant complications for the Window Manager
+ // and for multithread applications, so it is not allowed. An
+ // application can only set the pixel format of a window one
+ // time. Once a window's pixel format is set, it cannot be
+ // changed.
+ //
+ // so we need to delete the old window and create the new one
+
+ // destroy Window
+ ::ReleaseDC(GetHwnd(), m_hDC);
+ m_hDC = 0;
+
+ parent->RemoveChild(this);
+ const HWND hwnd = GetHwnd();
+ DissociateHandle(); // will do SetHWND(0);
+ ::DestroyWindow(hwnd);
+
+ // now recreate with FSAA pixelFormat
+ if ( !CreateWindow(parent, id, pos, size, style, name) )
+ return false;
+
+ if ( !::SetPixelFormat(m_hDC, pixelFormat, &pfd) )
+ {
+ wxLogLastError(_T("SetPixelFormat"));
+ return false;
+ }
+ }
+ }
+
#if wxUSE_PALETTE
if ( !SetupPalette(palette) )
return false;
{
if ( !::SwapBuffers(m_hDC) )
{
- return false;
wxLogLastError(_T("SwapBuffers"));
+ return false;
}
+
return true;
}
+
+// ----------------------------------------------------------------------------
+// multi sample support
+// ----------------------------------------------------------------------------
+
+// this macro defines a variable of type "name_t" called "name" and initializes
+// it with the pointer to WGL function "name" (which may be NULL)
+#define wxDEFINE_WGL_FUNC(name) \
+ name##_t name = (name##_t)wglGetProcAddress(#name)
+
+/* static */
+bool wxGLCanvasBase::IsExtensionSupported(const char *extension)
+{
+ static const char *s_extensionsList = (char *)wxUIntPtr(-1);
+ if ( s_extensionsList == (char *)wxUIntPtr(-1) )
+ {
+ typedef const char * (WINAPI *wglGetExtensionsStringARB_t)(HDC hdc);
+
+ wxDEFINE_WGL_FUNC(wglGetExtensionsStringARB);
+ if ( wglGetExtensionsStringARB )
+ {
+ s_extensionsList = wglGetExtensionsStringARB(wglGetCurrentDC());
+ }
+ else
+ {
+ typedef const char * (WINAPI * wglGetExtensionsStringEXT_t)();
+
+ wxDEFINE_WGL_FUNC(wglGetExtensionsStringEXT);
+ if ( wglGetExtensionsStringEXT )
+ {
+ s_extensionsList = wglGetExtensionsStringEXT();
+ }
+ else
+ {
+ s_extensionsList = NULL;
+ }
+ }
+ }
+
+ return s_extensionsList && IsExtensionInList(s_extensionsList, extension);
+}
+
+// this is a wrapper around wglChoosePixelFormatARB(): returns the pixel format
+// index matching the given attributes on success or 0 on failure
+static int ChoosePixelFormatARB(HDC hdc, const int *attribList)
+{
+ if ( !wxGLCanvas::IsExtensionSupported("WGL_ARB_multisample") )
+ return 0;
+
+ typedef BOOL (WINAPI * wglChoosePixelFormatARB_t)
+ (HDC hdc,
+ const int *piAttribIList,
+ const FLOAT *pfAttribFList,
+ UINT nMaxFormats,
+ int *piFormats,
+ UINT *nNumFormats
+ );
+
+ wxDEFINE_WGL_FUNC(wglChoosePixelFormatARB);
+ if ( !wglChoosePixelFormatARB )
+ return 0; // should not occur if extension is supported
+
+ int iAttributes[128];
+ int dst = 0; // index in iAttributes array
+
+ #define ADD_ATTR(attr, value) \
+ iAttributes[dst++] = attr; iAttributes[dst++] = value
+
+ ADD_ATTR( WGL_DRAW_TO_WINDOW_ARB, GL_TRUE );
+ ADD_ATTR( WGL_SUPPORT_OPENGL_ARB, GL_TRUE );
+ ADD_ATTR( WGL_ACCELERATION_ARB, WGL_FULL_ACCELERATION_ARB );
+
+ if ( !attribList )
+ {
+ ADD_ATTR( WGL_COLOR_BITS_ARB, 24 );
+ ADD_ATTR( WGL_ALPHA_BITS_ARB, 8 );
+ ADD_ATTR( WGL_DEPTH_BITS_ARB, 16 );
+ ADD_ATTR( WGL_STENCIL_BITS_ARB, 0 );
+ ADD_ATTR( WGL_DOUBLE_BUFFER_ARB, GL_TRUE );
+ ADD_ATTR( WGL_SAMPLE_BUFFERS_ARB, GL_TRUE );
+ ADD_ATTR( WGL_SAMPLES_ARB, 4 );
+ }
+ else // have custom attributes
+ {
+ #define ADD_ATTR_VALUE(attr) ADD_ATTR(attr, attribList[src++])
+
+ int src = 0;
+ while ( attribList[src] )
+ {
+ switch ( attribList[src++] )
+ {
+ case WX_GL_RGBA:
+ ADD_ATTR( WGL_COLOR_BITS_ARB, 24 );
+ ADD_ATTR( WGL_ALPHA_BITS_ARB, 8 );
+ break;
+
+ case WX_GL_BUFFER_SIZE:
+ ADD_ATTR_VALUE( WGL_COLOR_BITS_ARB);
+ break;
+
+ case WX_GL_LEVEL:
+ if ( attribList[src] > 0 )
+ {
+ ADD_ATTR( WGL_NUMBER_OVERLAYS_ARB, 1 );
+ }
+ else if ( attribList[src] <0 )
+ {
+ ADD_ATTR( WGL_NUMBER_UNDERLAYS_ARB, 1 );
+ }
+ //else: ignore it
+
+ src++; // skip the value in any case
+ break;
+
+ case WX_GL_DOUBLEBUFFER:
+ ADD_ATTR( WGL_DOUBLE_BUFFER_ARB, GL_TRUE );
+ break;
+
+ case WX_GL_STEREO:
+ ADD_ATTR( WGL_STEREO_ARB, GL_TRUE );
+ break;
+
+ case WX_GL_AUX_BUFFERS:
+ ADD_ATTR_VALUE( WGL_AUX_BUFFERS_ARB );
+ break;
+
+ case WX_GL_MIN_RED:
+ ADD_ATTR_VALUE( WGL_RED_BITS_ARB );
+ break;
+
+ case WX_GL_MIN_GREEN:
+ ADD_ATTR_VALUE( WGL_GREEN_BITS_ARB );
+ break;
+
+ case WX_GL_MIN_BLUE:
+ ADD_ATTR_VALUE( WGL_BLUE_BITS_ARB );
+ break;
+
+ case WX_GL_MIN_ALPHA:
+ ADD_ATTR_VALUE( WGL_ALPHA_BITS_ARB );
+ break;
+
+ case WX_GL_DEPTH_SIZE:
+ ADD_ATTR_VALUE( WGL_DEPTH_BITS_ARB );
+ break;
+
+ case WX_GL_STENCIL_SIZE:
+ ADD_ATTR_VALUE( WGL_STENCIL_BITS_ARB );
+ break;
+
+ case WX_GL_MIN_ACCUM_RED:
+ ADD_ATTR_VALUE( WGL_ACCUM_RED_BITS_ARB );
+ break;
+
+ case WX_GL_MIN_ACCUM_GREEN:
+ ADD_ATTR_VALUE( WGL_ACCUM_GREEN_BITS_ARB );
+ break;
+
+ case WX_GL_MIN_ACCUM_BLUE:
+ ADD_ATTR_VALUE( WGL_ACCUM_BLUE_BITS_ARB );
+ break;
+
+ case WX_GL_MIN_ACCUM_ALPHA:
+ ADD_ATTR_VALUE( WGL_ACCUM_ALPHA_BITS_ARB );
+ break;
+
+ case WX_GL_SAMPLE_BUFFERS:
+ ADD_ATTR_VALUE( WGL_SAMPLE_BUFFERS_ARB );
+ break;
+
+ case WX_GL_SAMPLES:
+ ADD_ATTR_VALUE( WGL_SAMPLES_ARB );
+ break;
+ }
+ }
+
+ #undef ADD_ATTR_VALUE
+ }
+
+ #undef ADD_ATTR
+
+ iAttributes[dst++] = 0;
+
+ int pf;
+ UINT numFormats = 0;
+ if ( !wglChoosePixelFormatARB(hdc, iAttributes, NULL, 1, &pf, &numFormats) )
+ {
+ wxLogLastError(_T("wglChoosePixelFormatARB"));
+ return 0;
+ }
+
+ return pf;
+}
+
// ----------------------------------------------------------------------------
// pixel format stuff
// ----------------------------------------------------------------------------
-static void
+// returns true if pfd was adjusted accordingly to attributes provided, false
+// if there is an error with attributes or -1 if the attributes indicate
+// features not supported by ChoosePixelFormat() at all (currently only multi
+// sampling)
+static int
AdjustPFDForAttributes(PIXELFORMATDESCRIPTOR& pfd, const int *attribList)
{
if ( !attribList )
- return;
+ return 1;
+ // remove default attributes
pfd.dwFlags &= ~PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_COLORINDEX;
- pfd.cColorBits = 0;
- int arg=0;
- while ( attribList[arg] )
+ bool requestFSAA = false;
+ for ( int arg = 0; attribList[arg]; )
{
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_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.cColorBits +
- (pfd.cRedBits = attribList[arg++]));
+ pfd.cColorBits += (pfd.cRedBits = attribList[arg++]);
break;
+
case WX_GL_MIN_GREEN:
- pfd.cColorBits = (pfd.cColorBits +
- (pfd.cGreenBits = attribList[arg++]));
+ pfd.cColorBits += (pfd.cGreenBits = attribList[arg++]);
break;
+
case WX_GL_MIN_BLUE:
- pfd.cColorBits = (pfd.cColorBits +
- (pfd.cBlueBits = attribList[arg++]));
+ 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.cAccumBits +
- (pfd.cAccumRedBits = attribList[arg++]));
+ pfd.cAccumBits += (pfd.cAccumRedBits = attribList[arg++]);
break;
+
case WX_GL_MIN_ACCUM_GREEN:
- pfd.cAccumBits = (pfd.cAccumBits +
- (pfd.cAccumGreenBits = attribList[arg++]));
+ pfd.cAccumBits += (pfd.cAccumGreenBits = attribList[arg++]);
break;
+
case WX_GL_MIN_ACCUM_BLUE:
- pfd.cAccumBits = (pfd.cAccumBits +
- (pfd.cAccumBlueBits = attribList[arg++]));
+ pfd.cAccumBits += (pfd.cAccumBlueBits = attribList[arg++]);
break;
+
case WX_GL_MIN_ACCUM_ALPHA:
- pfd.cAccumBits = (pfd.cAccumBits +
- (pfd.cAccumAlphaBits = attribList[arg++]));
+ pfd.cAccumBits += (pfd.cAccumAlphaBits = attribList[arg++]);
+ break;
+
+ case WX_GL_SAMPLE_BUFFERS:
+ case WX_GL_SAMPLES:
+ // There is no support for multisample when using PIXELFORMATDESCRIPTOR
+ requestFSAA = true; // Remember that multi sample is requested.
+ arg++; // will call ChoosePixelFormatARB() later
break;
}
}
+
+ return requestFSAA ? -1 : 1;
}
/* static */
1, // version
PFD_SUPPORT_OPENGL |
PFD_DRAW_TO_WINDOW |
- PFD_DOUBLEBUFFER, // support double-buffering
- PFD_TYPE_RGBA, // color type
- 16, // preferred 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, // accumulator bits (ignored)
+ PFD_DOUBLEBUFFER, // use double-buffering by default
+ PFD_TYPE_RGBA, // default pixel type
+ 0, // preferred color depth (don't care)
+ 0, 0, 0, 0, 0, 0, // color bits and shift bits (ignored)
+ 0, 0, // alpha bits and shift (ignored)
+ 0, // accumulation total bits
+ 0, 0, 0, 0, // accumulator RGBA bits (not used)
16, // depth buffer
0, // no stencil buffer
0, // no auxiliary buffers
else
*ppfd = pfd;
- AdjustPFDForAttributes(*ppfd, attribList);
+ // adjust the PFD using the provided attributes and also check if we can
+ // use PIXELFORMATDESCRIPTOR at all: if multisampling is requested, we
+ // can't as it's not supported by ChoosePixelFormat()
+ switch ( AdjustPFDForAttributes(*ppfd, attribList) )
+ {
+ case 1:
+ return ::ChoosePixelFormat(hdc, ppfd);
+
+ default:
+ wxFAIL_MSG( "unexpected AdjustPFDForAttributes() return value" );
+ // fall through
- return ::ChoosePixelFormat(hdc, ppfd);
+ case 0:
+ // error in attributes
+ return 0;
+
+ case -1:
+ // requestFSAA == true, will continue as normal
+ // in order to query later for a FSAA pixelformat
+ return -1;
+ }
}
-bool wxGLCanvas::DoSetup(const int *attribList)
+/* static */
+bool wxGLCanvasBase::IsDisplaySupported(const int *attribList)
{
- PIXELFORMATDESCRIPTOR pfd;
- const int pixelFormat = ChooseMatchingPixelFormat(m_hDC, attribList, &pfd);
+ // We need a device context to test the pixel format, so get one
+ // for the root window.
+ return wxGLCanvas::ChooseMatchingPixelFormat(ScreenHDC(), attribList) > 0;
+}
+
+int wxGLCanvas::DoSetup(PIXELFORMATDESCRIPTOR &pfd, const int *attribList)
+{
+ int pixelFormat = ChooseMatchingPixelFormat(m_hDC, attribList, &pfd);
+
+ const bool requestFSAA = pixelFormat == -1;
+ if ( requestFSAA )
+ pixelFormat = ::ChoosePixelFormat(m_hDC, &pfd);
+
if ( !pixelFormat )
{
wxLogLastError(_T("ChoosePixelFormat"));
- return false;
+ return 0;
}
if ( !::SetPixelFormat(m_hDC, pixelFormat, &pfd) )
{
wxLogLastError(_T("SetPixelFormat"));
- return false;
+ return 0;
}
- return true;
+ return requestFSAA ? -1 : 1;
}
// ----------------------------------------------------------------------------
pPal->palNumEntries = (WORD)paletteSize;
/* build a simple RGB color palette */
- {
int redMask = (1 << pfd.cRedBits) - 1;
int greenMask = (1 << pfd.cGreenBits) - 1;
int blueMask = (1 << pfd.cBlueBits) - 1;
- int i;
- for (i=0; i<paletteSize; ++i) {
+ for (int i=0; i<paletteSize; ++i)
+ {
pPal->palPalEntry[i].peRed =
(BYTE)((((i >> pfd.cRedShift) & redMask) * 255) / redMask);
pPal->palPalEntry[i].peGreen =
(BYTE)((((i >> pfd.cBlueShift) & blueMask) * 255) / blueMask);
pPal->palPalEntry[i].peFlags = 0;
}
- }
HPALETTE hPalette = CreatePalette(pPal);
free(pPal);
projects / wxWidgets.git / blobdiff