diff options
Diffstat (limited to 'intern/ghost/intern/GHOST_ContextWGL.cpp')
| -rw-r--r-- | intern/ghost/intern/GHOST_ContextWGL.cpp | 69 |
1 files changed, 54 insertions, 15 deletions
diff --git a/intern/ghost/intern/GHOST_ContextWGL.cpp b/intern/ghost/intern/GHOST_ContextWGL.cpp index cb580f60bd7..eeb6a2469ee 100644 --- a/intern/ghost/intern/GHOST_ContextWGL.cpp +++ b/intern/ghost/intern/GHOST_ContextWGL.cpp @@ -63,6 +63,7 @@ static bool is_crappy_intel_card() GHOST_ContextWGL::GHOST_ContextWGL( bool stereoVisual, + bool alphaBackground, GHOST_TUns16 numOfAASamples, HWND hWnd, HDC hDC, @@ -78,6 +79,7 @@ GHOST_ContextWGL::GHOST_ContextWGL( m_contextMajorVersion(contextMajorVersion), m_contextMinorVersion(contextMinorVersion), m_contextFlags(contextFlags), + m_alphaBackground(alphaBackground), m_contextResetNotificationStrategy(contextResetNotificationStrategy), m_hGLRC(NULL) #ifdef WITH_GLEW_MX @@ -168,7 +170,7 @@ GHOST_TSuccess GHOST_ContextWGL::activateDrawingContext() /* Ron Fosner's code for weighting pixel formats and forcing software. * See http://www.opengl.org/resources/faq/technical/weight.cpp */ -static int weight_pixel_format(PIXELFORMATDESCRIPTOR &pfd) +static int weight_pixel_format(PIXELFORMATDESCRIPTOR &pfd, PIXELFORMATDESCRIPTOR &preferredPFD) { int weight = 0; @@ -194,11 +196,12 @@ static int weight_pixel_format(PIXELFORMATDESCRIPTOR &pfd) weight += pfd.cColorBits - 8; -#ifdef GHOST_OPENGL_ALPHA - if (pfd.cAlphaBits > 0) + if (preferredPFD.cAlphaBits > 0 && pfd.cAlphaBits > 0) + weight++; +#ifdef WIN32_COMPOSITING + if ((preferredPFD.dwFlags & PFD_SUPPORT_COMPOSITION) && (pfd.dwFlags & PFD_SUPPORT_COMPOSITION)) weight++; #endif - #ifdef GHOST_OPENGL_STENCIL if (pfd.cStencilBits >= 8) weight++; @@ -239,7 +242,7 @@ static int choose_pixel_format_legacy(HDC hDC, PIXELFORMATDESCRIPTOR &preferredP WIN32_CHK(check == lastPFD); - int w = weight_pixel_format(pfd); + int w = weight_pixel_format(pfd, preferredPFD); if (w > weight) { weight = w; @@ -496,7 +499,10 @@ int GHOST_ContextWGL::_choose_pixel_format_arb_2( { std::vector<int> iAttributes; +#define _MAX_PIXEL_FORMATS 32 + int iPixelFormat = 0; + int iPixelFormats[_MAX_PIXEL_FORMATS]; int samples; @@ -521,8 +527,31 @@ int GHOST_ContextWGL::_choose_pixel_format_arb_2( sRGB); UINT nNumFormats; - WIN32_CHK(wglChoosePixelFormatARB(m_hDC, &(iAttributes[0]), NULL, 1, &iPixelFormat, &nNumFormats)); - + WIN32_CHK(wglChoosePixelFormatARB(m_hDC, &(iAttributes[0]), NULL, _MAX_PIXEL_FORMATS, iPixelFormats, &nNumFormats)); + +#ifdef WIN32_COMPOSITING + if (needAlpha && nNumFormats) { + // scan through all pixel format to make sure one supports compositing + PIXELFORMATDESCRIPTOR pfd; + int i; + + for (i = 0; i < nNumFormats; i++) { + if (DescribePixelFormat(m_hDC, iPixelFormats[i], sizeof(PIXELFORMATDESCRIPTOR), &pfd)) { + if (pfd.dwFlags & PFD_SUPPORT_COMPOSITION) { + iPixelFormat = iPixelFormats[i]; + break; + } + } + } + if (i == nNumFormats) { + fprintf(stderr, + "Warning! Unable to find a pixel format with compositing capability.\n"); + iPixelFormat = iPixelFormats[0]; + } + } + else +#endif + iPixelFormat = iPixelFormats[0]; /* total number of formats that match (regardless of size of iPixelFormat array) * see: WGL_ARB_pixel_format extension spec */ if (nNumFormats > 0) @@ -538,7 +567,7 @@ int GHOST_ContextWGL::_choose_pixel_format_arb_2( // check how many samples were actually gotten if (iPixelFormat != 0) { int iQuery[] = { WGL_SAMPLES_ARB }; - int actualSamples; + int actualSamples, alphaBits; wglGetPixelFormatAttribivARB(m_hDC, iPixelFormat, 0, 1, iQuery, &actualSamples); if (actualSamples != *numOfAASamples) { @@ -549,6 +578,14 @@ int GHOST_ContextWGL::_choose_pixel_format_arb_2( *numOfAASamples = actualSamples; // set context property to actual value } + if (needAlpha) { + iQuery[0] = WGL_ALPHA_BITS_ARB; + wglGetPixelFormatAttribivARB(m_hDC, iPixelFormat, 0, 1, iQuery, &alphaBits); + if (alphaBits == 0) { + fprintf(stderr, + "Warning! Unable to find a frame buffer with alpha channel.\n"); + } + } } else { *numOfAASamples = 0; @@ -674,9 +711,15 @@ int GHOST_ContextWGL::choose_pixel_format( PFD_DRAW_TO_WINDOW | PFD_SWAP_COPY | /* support swap copy */ PFD_DOUBLEBUFFER | /* support double-buffering */ - (stereoVisual ? PFD_STEREO : 0), /* support stereo */ + (stereoVisual ? PFD_STEREO : 0) |/* support stereo */ + ( +#ifdef WIN32_COMPOSITING + needAlpha ? PFD_SUPPORT_COMPOSITION : /* support composition for transparent background */ +#endif + 0 + ), PFD_TYPE_RGBA, /* color type */ - 24, /* preferred color depth */ + (needAlpha ? 32 : 24), /* preferred color depth */ 0, 0, 0, 0, 0, 0, /* color bits (ignored) */ needAlpha ? 8 : 0, /* alpha buffer */ 0, /* alpha shift (ignored) */ @@ -727,11 +770,7 @@ static void reportContextString(const char *name, const char *dummy, const char GHOST_TSuccess GHOST_ContextWGL::initializeDrawingContext() { -#ifdef GHOST_OPENGL_ALPHA - const bool needAlpha = true; -#else - const bool needAlpha = false; -#endif + const bool needAlpha = m_alphaBackground; #ifdef GHOST_OPENGL_STENCIL const bool needStencil = true; |