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Add GLFW_TRANSPARENT and X11 implementation

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This is a squashed extract of several commits, minimally edited to
ensure it compiles.

Related to #197.
Related to #715.
This commit is contained in:
Wolfgang Draxinger
2016-02-22 18:08:15 +01:00
committed by Camilla Löwy
parent eed94448fd
commit 019609b6cd
11 changed files with 180 additions and 16 deletions
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src/x11_init.c
+49
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@@ -717,6 +717,55 @@ static GLFWbool initExtensions(void)
_glfw.x11.MOTIF_WM_HINTS =
XInternAtom(_glfw.x11.display, "_MOTIF_WM_HINTS", False);
int i;
const char* sonames_xrender[] =
{
#if defined(__CYGWIN__)
"libXrender-1.so",
#else
"libXrender.so.1",
"libXrender.so",
#endif
NULL
};
// Xrender support is optional and not a requirement for GLX/EGL
// to work. Xrender is required for selecting a FB config that
// supports a picture format with an alpha mask, which in turn
// is required for transparent windows. I Xrender is not supported
// the GLFW_TRANSPARENT window hint is ignored.
for (i = 0; sonames_xrender[i]; i++)
{
_glfw.xrender.handle = dlopen(sonames_xrender[i], RTLD_LAZY | RTLD_GLOBAL);
if (_glfw.xrender.handle)
break;
}
_glfw.xrender.errorBase = 0;
_glfw.xrender.eventBase = 0;
_glfw.xrender.major = 0;
_glfw.xrender.minor = 0;
if (_glfw.xrender.handle) do {
int errorBase, eventBase, major, minor;
_glfw.xrender.QueryExtension =
dlsym(_glfw.xrender.handle, "XRenderQueryExtension");
_glfw.xrender.QueryVersion =
dlsym(_glfw.xrender.handle, "XRenderQueryVersion");
_glfw.xrender.FindVisualFormat =
dlsym(_glfw.xrender.handle, "XRenderFindVisualFormat");
if ( !XRenderQueryExtension(_glfw.x11.display, &errorBase, &eventBase)) {
break;
}
if ( !XRenderQueryVersion(_glfw.x11.display, &major, &minor)) {
break;
}
_glfw.xrender.errorBase = errorBase;
_glfw.xrender.eventBase = eventBase;
_glfw.xrender.major = major;
_glfw.xrender.minor = minor;
} while(0);
return GLFW_TRUE;
}