----- Original Message ----- > On 06/09/2014 07:22 AM, Jose Fonseca wrote: > > I don't think that OpenGL ICD should advertise multi-sample formats via the > > standard DescribePixelFormat. > > http://www.opengl.org/registry/specs/ARB/wgl_pixel_format.txt states: > > > > Indices are assigned to pixel formats in the following order: > > > > 1. Accelerated pixel formats that are displayable > > > > 2. Accelerated pixel formats that are displayable and which have > > extended attributes > > > > 3. Generic pixel formats > > > > 4. Accelerated pixel formats that are non displayable > > > > ChoosePixelFormat will never select pixel formats from either group > > 2 or group 4. Each pixel format in group 2 is required to appear > > identical to some pixel format in group 1 when queried by > > DescribePixelFormat. Consequently, ChoosePixelFormat will always > > select a format from group 1 when it might otherwise have selected a > > format from group 2. Pixel formats in group 4 cannot be accessed by > > ChoosePixelFormat at all. > > > > That is, IIUC, in order to discover multi-sampled formats one must get the > > the number of pixel formats via > > wglGetPixelFormatAttribivARB(WGL_NUMBER_PIXEL_FORMATS_ARB) instead of > > > > numVisuals = DescribePixelFormat(hdc, 1, sizeof(PIXELFORMATDESCRIPTOR), > > NULL); > > if (numVisuals == 0) > > return; > > > > And I'm not even sure if it is OK to call DescribePixelFormat() with > > extended pixel formats or if one must use exclusively > > wglGetPixelFormatAttribivARB/wglGetPixelFormatAttribivARB. You can see > > how GLFW does it on > > https://github.com/glfw/glfw/blob/master/src/wgl_context.c#L144 > > Nothing's ever easy on Windows. <sigh>
No. OPENGL32.DLL interface > The code as-is seems to work fine both on a Windows/nvidia host and in > the guest but I'll try the changes you suggested... Is wglinfo displaying multi-sampled pixelformats on NVIDIA as is? If so then my interpretation might be wrong somehow. Jose _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
