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Add support for transparent X11/GLX window

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This commit is contained in:
Wolfgang Draxinger 2016-02-22 18:08:15 +01:00 committed by Camilla Berglund
parent de3e413aab
commit 1a33796098
7 changed files with 135 additions and 13 deletions
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3
examples/gears.c
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@ -172,6 +172,7 @@ static GLfloat angle = 0.f;
/* OpenGL draw function & timing */
static void draw(void)
{
glClearColor(0., 0., 0., 0.);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
@ -311,6 +312,8 @@ int main(int argc, char *argv[])
}
glfwWindowHint(GLFW_DEPTH_BITS, 16);
glfwWindowHint(GLFW_ALPHA_BITS, 8);
glfwWindowHint(GLFW_TRANSPARENT, GLFW_TRUE);
window = glfwCreateWindow( 300, 300, "Gears", NULL, NULL );
if (!window)

1
include/GLFW/glfw3.h
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@ -627,6 +627,7 @@ extern "C" {
#define GLFW_AUTO_ICONIFY 0x00020006
#define GLFW_FLOATING 0x00020007
#define GLFW_MAXIMIZED 0x00020008
#define GLFW_TRANSPARENT 0x00020009
#define GLFW_RED_BITS 0x00021001
#define GLFW_GREEN_BITS 0x00021002

98
src/glx_context.c
View File

@ -47,7 +47,10 @@ static int getFBConfigAttrib(GLXFBConfig fbconfig, int attrib)
// Return a list of available and usable framebuffer configs
//
static GLFWbool chooseFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* result)
static GLFWbool chooseFBConfig(
const _GLFWfbconfig* desired,
GLXFBConfig* result,
GLFWbool findTransparent)
{
GLXFBConfig* nativeConfigs;
_GLFWfbconfig* usableConfigs;
@ -56,6 +59,10 @@ static GLFWbool chooseFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* result
const char* vendor;
GLFWbool trustWindowBit = GLFW_TRUE;
if (findTransparent && !(_glfw.xrender.major || _glfw.xrender.minor)) {
findTransparent = GLFW_FALSE;
}
// HACK: This is a (hopefully temporary) workaround for Chromium
// (VirtualBox GL) not setting the window bit on any GLXFBConfigs
vendor = glXGetClientString(_glfw.x11.display, GLX_VENDOR);
@ -73,6 +80,7 @@ static GLFWbool chooseFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* result
usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));
usableCount = 0;
selectionloop:
for (i = 0; i < nativeCount; i++)
{
const GLXFBConfig n = nativeConfigs[i];
@ -89,6 +97,22 @@ static GLFWbool chooseFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* result
continue;
}
if( findTransparent ) {
XVisualInfo *visualinfo;
XRenderPictFormat *pictFormat;
visualinfo = glXGetVisualFromFBConfig(_glfw.x11.display, n);
if (!visualinfo)
continue;
pictFormat = XRenderFindVisualFormat(_glfw.x11.display, visualinfo->visual);
if( !pictFormat )
continue;
if( !pictFormat->direct.alphaMask )
continue;
}
u->redBits = getFBConfigAttrib(n, GLX_RED_SIZE);
u->greenBits = getFBConfigAttrib(n, GLX_GREEN_SIZE);
u->blueBits = getFBConfigAttrib(n, GLX_BLUE_SIZE);
@ -118,6 +142,12 @@ static GLFWbool chooseFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* result
u->glx = n;
usableCount++;
}
// reiterate the selection loop without looking for transparency supporting
// formats if no matchig FB configs for a transparent window were found.
if( findTransparent && !usableCount ) {
findTransparent = GLFW_FALSE;
goto selectionloop;
}
closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount);
if (closest)
@ -152,7 +182,7 @@ static GLXContext createLegacyContext(_GLFWwindow* window,
GLFWbool _glfwInitGLX(void)
{
int i;
const char* sonames[] =
const char* sonames_glx[] =
{
#if defined(__CYGWIN__)
"libGL-1.so",
@ -163,14 +193,32 @@ GLFWbool _glfwInitGLX(void)
NULL
};
for (i = 0; sonames[i]; i++)
const char* sonames_xrender[] =
{
_glfw.glx.handle = dlopen(sonames[i], RTLD_LAZY | RTLD_GLOBAL);
#if defined(__CYGWIN__)
"libXrender-1.so",
#else
"libXrender.so.1",
"libXrender.so",
#endif
NULL
};
for (i = 0; sonames_glx[i]; i++)
{
_glfw.glx.handle = dlopen(sonames_glx[i], RTLD_LAZY | RTLD_GLOBAL);
if (_glfw.glx.handle)
break;
}
for (i = 0; sonames_xrender[i]; i++)
{
_glfw.xrender.handle = dlopen(sonames_xrender[i], RTLD_LAZY | RTLD_GLOBAL);
if (_glfw.xrender.handle)
break;
}
if (!_glfw.glx.handle)
{
_glfwInputError(GLFW_API_UNAVAILABLE, "GLX: Failed to load GLX");
@ -230,6 +278,37 @@ GLFWbool _glfwInitGLX(void)
return GLFW_FALSE;
}
// Xrender support is optional and not a requirement for GLX
// 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.
_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);
if (_glfwPlatformExtensionSupported("GLX_EXT_swap_control"))
{
_glfw.glx.SwapIntervalEXT = (PFNGLXSWAPINTERVALEXTPROC)
@ -324,7 +403,7 @@ GLFWbool _glfwCreateContextGLX(_GLFWwindow* window,
if (ctxconfig->share)
share = ctxconfig->share->context.glx.handle;
if (!chooseFBConfig(fbconfig, &native))
if (!chooseFBConfig(fbconfig, &native, window->transparent))
{
_glfwInputError(GLFW_FORMAT_UNAVAILABLE,
"GLX: Failed to find a suitable GLXFBConfig");
@ -507,14 +586,15 @@ void _glfwDestroyContextGLX(_GLFWwindow* window)
// Returns the Visual and depth of the chosen GLXFBConfig
//
GLFWbool _glfwChooseVisualGLX(const _GLFWctxconfig* ctxconfig,
GLFWbool _glfwChooseVisualGLX(const _GLFWwndconfig* wndconfig,
const _GLFWctxconfig* ctxconfig,
const _GLFWfbconfig* fbconfig,
Visual** visual, int* depth)
{
GLXFBConfig native;
XVisualInfo* result;
if (!chooseFBConfig(fbconfig, &native))
if (!chooseFBConfig(fbconfig, &native, wndconfig->transparent))
{
_glfwInputError(GLFW_FORMAT_UNAVAILABLE,
"GLX: Failed to find a suitable GLXFBConfig");
@ -530,7 +610,7 @@ GLFWbool _glfwChooseVisualGLX(const _GLFWctxconfig* ctxconfig,
}
*visual = result->visual;
*depth = result->depth;
*depth = result->depth;
XFree(result);
return GLFW_TRUE;

35
src/glx_context.h
View File

@ -74,6 +74,7 @@ typedef struct __GLXFBConfig* GLXFBConfig;
typedef struct __GLXcontext* GLXContext;
typedef void (*__GLXextproc)(void);
// libGL.so function pointer typedefs
typedef int (*PFNGLXGETFBCONFIGATTRIBPROC)(Display*,GLXFBConfig,int,int*);
typedef const char* (*PFNGLXGETCLIENTSTRINGPROC)(Display*,int);
typedef Bool (*PFNGLXQUERYEXTENSIONPROC)(Display*,int*,int*);
@ -93,7 +94,7 @@ typedef XVisualInfo* (*PFNGLXGETVISUALFROMFBCONFIGPROC)(Display*,GLXFBConfig);
typedef GLXWindow (*PFNGLXCREATEWINDOWPROC)(Display*,GLXFBConfig,Window,const int*);
typedef void (*PFNGLXDESTROYWINDOWPROC)(Display*,GLXWindow);
// libGL.so function pointer typedefs
// libGL.so function identifier overlays
#define glXGetFBConfigs _glfw.glx.GetFBConfigs
#define glXGetFBConfigAttrib _glfw.glx.GetFBConfigAttrib
#define glXGetClientString _glfw.glx.GetClientString
@ -108,9 +109,19 @@ typedef void (*PFNGLXDESTROYWINDOWPROC)(Display*,GLXWindow);
#define glXCreateWindow _glfw.glx.CreateWindow
#define glXDestroyWindow _glfw.glx.DestroyWindow
// libXrender.so function pointer typedefs
typedef Bool (*PFNXRENDERQUERYEXTENSIONPROC)(Display*,int*,int*);
typedef Status (*PFNXRENDERQUERYVERSIONPROC)(Display*dpy,int*,int*);
typedef XRenderPictFormat* (*PFNXRENDERFINDVISUALFORMATPROC)(Display*,Visual const *);
// libXrender.so function identifier overlays
#define XRenderQueryExtension _glfw.xrender.QueryExtension
#define XRenderQueryVersion _glfw.xrender.QueryVersion
#define XRenderFindVisualFormat _glfw.xrender.FindVisualFormat
#define _GLFW_PLATFORM_FBCONFIG GLXFBConfig glx
#define _GLFW_PLATFORM_CONTEXT_STATE _GLFWcontextGLX glx
#define _GLFW_PLATFORM_LIBRARY_CONTEXT_STATE _GLFWlibraryGLX glx
#define _GLFW_PLATFORM_LIBRARY_CONTEXT_STATE _GLFWlibraryGLX glx ; _GLFWlibraryXrender xrender
// GLX-specific per-context data
@ -170,6 +181,23 @@ typedef struct _GLFWlibraryGLX
} _GLFWlibraryGLX;
// Xrender-specific global data
//
typedef struct _GLFWlibraryXrender
{
int major, minor;
int eventBase;
int errorBase;
// dlopen handle for libGL.so.1
void* handle;
// Xrender functions (subset required for transparent window)
PFNXRENDERQUERYEXTENSIONPROC QueryExtension;
PFNXRENDERQUERYVERSIONPROC QueryVersion;
PFNXRENDERFINDVISUALFORMATPROC FindVisualFormat;
} _GLFWlibraryXrender;
GLFWbool _glfwInitGLX(void);
void _glfwTerminateGLX(void);
@ -177,7 +205,8 @@ GLFWbool _glfwCreateContextGLX(_GLFWwindow* window,
const _GLFWctxconfig* ctxconfig,
const _GLFWfbconfig* fbconfig);
void _glfwDestroyContextGLX(_GLFWwindow* window);
GLFWbool _glfwChooseVisualGLX(const _GLFWctxconfig* ctxconfig,
GLFWbool _glfwChooseVisualGLX(const _GLFWwndconfig* wndconfig,
const _GLFWctxconfig* ctxconfig,
const _GLFWfbconfig* fbconfig,
Visual** visual, int* depth);

2
src/internal.h
View File

@ -252,6 +252,7 @@ struct _GLFWwndconfig
GLFWbool resizable;
GLFWbool visible;
GLFWbool decorated;
GLFWbool transparent;
GLFWbool focused;
GLFWbool autoIconify;
GLFWbool floating;
@ -341,6 +342,7 @@ struct _GLFWwindow
// Window settings and state
GLFWbool resizable;
GLFWbool decorated;
GLFWbool transparent;
GLFWbool autoIconify;
GLFWbool floating;
GLFWbool closed;

7
src/window.c
View File

@ -178,6 +178,7 @@ GLFWAPI GLFWwindow* glfwCreateWindow(int width, int height,
window->monitor = wndconfig.monitor;
window->resizable = wndconfig.resizable;
window->decorated = wndconfig.decorated;
window->transparent = wndconfig.transparent;
window->autoIconify = wndconfig.autoIconify;
window->floating = wndconfig.floating;
window->cursorMode = GLFW_CURSOR_NORMAL;
@ -256,6 +257,7 @@ void glfwDefaultWindowHints(void)
_glfw.hints.window.resizable = GLFW_TRUE;
_glfw.hints.window.visible = GLFW_TRUE;
_glfw.hints.window.decorated = GLFW_TRUE;
_glfw.hints.window.transparent = GLFW_FALSE;
_glfw.hints.window.focused = GLFW_TRUE;
_glfw.hints.window.autoIconify = GLFW_TRUE;
@ -330,6 +332,9 @@ GLFWAPI void glfwWindowHint(int hint, int value)
case GLFW_DECORATED:
_glfw.hints.window.decorated = value ? GLFW_TRUE : GLFW_FALSE;
break;
case GLFW_TRANSPARENT:
_glfw.hints.window.transparent = value ? GLFW_TRUE : GLFW_FALSE;
break;
case GLFW_FOCUSED:
_glfw.hints.window.focused = value ? GLFW_TRUE : GLFW_FALSE;
break;
@ -650,6 +655,8 @@ GLFWAPI int glfwGetWindowAttrib(GLFWwindow* handle, int attrib)
return window->resizable;
case GLFW_DECORATED:
return window->decorated;
case GLFW_TRANSPARENT:
return window->transparent;
case GLFW_FLOATING:
return window->floating;
case GLFW_CLIENT_API:

2
src/x11_window.c
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@ -1431,7 +1431,7 @@ int _glfwPlatformCreateWindow(_GLFWwindow* window,
else
{
#if defined(_GLFW_GLX)
if (!_glfwChooseVisualGLX(ctxconfig, fbconfig, &visual, &depth))
if (!_glfwChooseVisualGLX(wndconfig, ctxconfig, fbconfig, &visual, &depth))
return GLFW_FALSE;
#elif defined(_GLFW_EGL)
if (!_glfwChooseVisualEGL(ctxconfig, fbconfig, &visual, &depth))