diff options
| -rw-r--r-- | src/gallium/state_trackers/wgl/stw_context.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/src/gallium/state_trackers/wgl/stw_context.c b/src/gallium/state_trackers/wgl/stw_context.c index 58fe3b0b6e6..939ffd56832 100644 --- a/src/gallium/state_trackers/wgl/stw_context.c +++ b/src/gallium/state_trackers/wgl/stw_context.c @@ -133,6 +133,25 @@ DrvCreateLayerContext(HDC hdc, INT iLayerPlane) /** + * Return the stw pixel format that most closely matches the pixel format + * on HDC. + * Used to get a pixel format when SetPixelFormat() hasn't been called before. + */ +static int +get_matching_pixel_format(HDC hdc) +{ + int iPixelFormat = GetPixelFormat(hdc); + PIXELFORMATDESCRIPTOR pfd; + + if (!iPixelFormat) + return 0; + if (!DescribePixelFormat(hdc, iPixelFormat, sizeof(pfd), &pfd)) + return 0; + return stw_pixelformat_choose(hdc, &pfd); +} + + +/** * Called via DrvCreateContext(), DrvCreateLayerContext() and * wglCreateContextAttribsARB() to actually create a rendering context. * \param handle the desired DHGLRC handle to use for the context, or zero @@ -174,7 +193,7 @@ stw_create_context_attribs(HDC hdc, INT iLayerPlane, DHGLRC hShareContext, * but not all do, and the opengl32 runtime seems to use a default * pixel format in some cases, so use that. */ - iPixelFormat = GetPixelFormat(hdc); + iPixelFormat = get_matching_pixel_format(hdc); if (!iPixelFormat) return 0; } @@ -458,7 +477,7 @@ stw_make_current(HDC hDrawDC, HDC hReadDC, DHGLRC dhglrc) * pixel format in some cases, so we must create a framebuffer for * those here. */ - int iPixelFormat = GetPixelFormat(hDrawDC); + int iPixelFormat = get_matching_pixel_format(hDrawDC); if (iPixelFormat) fb = stw_framebuffer_create( hDrawDC, iPixelFormat ); if (!fb) |