diff --git a/examples/gears.c b/examples/gears.c index a787baed..f7526e05 100644 --- a/examples/gears.c +++ b/examples/gears.c @@ -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) diff --git a/include/GLFW/glfw3.h b/include/GLFW/glfw3.h index 05e76a9a..58b7d7b9 100644 --- a/include/GLFW/glfw3.h +++ b/include/GLFW/glfw3.h @@ -787,6 +787,7 @@ extern "C" { * Cursor centering [window hint](@ref GLFW_CENTER_CURSOR_hint). */ #define GLFW_CENTER_CURSOR 0x00020009 +#define GLFW_TRANSPARENT 0x0002000A /*! @brief Framebuffer bit depth hint. * diff --git a/src/egl_context.c b/src/egl_context.c index 54257f25..e5435468 100644 --- a/src/egl_context.c +++ b/src/egl_context.c @@ -87,13 +87,21 @@ static int getEGLConfigAttrib(EGLConfig config, int attrib) // static GLFWbool chooseEGLConfig(const _GLFWctxconfig* ctxconfig, const _GLFWfbconfig* desired, - EGLConfig* result) + EGLConfig* result, + GLFWbool findTransparent) { EGLConfig* nativeConfigs; _GLFWfbconfig* usableConfigs; const _GLFWfbconfig* closest; int i, nativeCount, usableCount; +#if defined(_GLFW_X11) + XVisualInfo visualTemplate = {0}; + if ( !(_glfw.xrender.major || _glfw.xrender.minor) ) { + findTransparent = GLFW_FALSE; + } +#endif // _GLFW_X11 + eglGetConfigs(_glfw.egl.display, NULL, 0, &nativeCount); if (!nativeCount) { @@ -107,6 +115,7 @@ static GLFWbool chooseEGLConfig(const _GLFWctxconfig* ctxconfig, usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig)); usableCount = 0; +selectionloop: for (i = 0; i < nativeCount; i++) { const EGLConfig n = nativeConfigs[i]; @@ -122,8 +131,31 @@ static GLFWbool chooseEGLConfig(const _GLFWctxconfig* ctxconfig, #if defined(_GLFW_X11) // Only consider EGLConfigs with associated Visuals - if (!getEGLConfigAttrib(n, EGL_NATIVE_VISUAL_ID)) + visualTemplate.visualid = getEGLConfigAttrib(n, EGL_NATIVE_VISUAL_ID); + if (!visualTemplate.visualid) continue; + + if( findTransparent ) { + int n_vi; + XVisualInfo *visualinfo; + XRenderPictFormat *pictFormat; + + visualinfo = XGetVisualInfo(_glfw.x11.display, VisualIDMask, &visualTemplate, &n_vi); + if (!visualinfo) + continue; + + pictFormat = XRenderFindVisualFormat(_glfw.x11.display, visualinfo->visual); + if( !pictFormat ) { + XFree( visualinfo ); + continue; + } + + if( !pictFormat->direct.alphaMask ) { + XFree( visualinfo ); + continue; + } + XFree( visualinfo ); + } #endif // _GLFW_X11 if (ctxconfig->client == GLFW_OPENGL_ES_API) @@ -159,6 +191,12 @@ static GLFWbool chooseEGLConfig(const _GLFWctxconfig* ctxconfig, u->handle = (uintptr_t) 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) @@ -455,7 +493,7 @@ GLFWbool _glfwCreateContextEGL(_GLFWwindow* window, if (ctxconfig->share) share = ctxconfig->share->context.egl.handle; - if (!chooseEGLConfig(ctxconfig, fbconfig, &config)) + if (!chooseEGLConfig(ctxconfig, fbconfig, &config, window->transparent)) { _glfwInputError(GLFW_FORMAT_UNAVAILABLE, "EGL: Failed to find a suitable EGLConfig"); @@ -689,7 +727,8 @@ GLFWbool _glfwCreateContextEGL(_GLFWwindow* window, // Returns the Visual and depth of the chosen EGLConfig // #if defined(_GLFW_X11) -GLFWbool _glfwChooseVisualEGL(const _GLFWctxconfig* ctxconfig, +GLFWbool _glfwChooseVisualEGL(const _GLFWwndconfig* wndconfig, + const _GLFWctxconfig* ctxconfig, const _GLFWfbconfig* fbconfig, Visual** visual, int* depth) { @@ -699,7 +738,7 @@ GLFWbool _glfwChooseVisualEGL(const _GLFWctxconfig* ctxconfig, EGLint visualID = 0, count = 0; const long vimask = VisualScreenMask | VisualIDMask; - if (!chooseEGLConfig(ctxconfig, fbconfig, &native)) + if (!chooseEGLConfig(ctxconfig, fbconfig, &native, wndconfig->transparent)) { _glfwInputError(GLFW_FORMAT_UNAVAILABLE, "EGL: Failed to find a suitable EGLConfig"); diff --git a/src/egl_context.h b/src/egl_context.h index bfab5111..aa339baa 100644 --- a/src/egl_context.h +++ b/src/egl_context.h @@ -211,7 +211,8 @@ GLFWbool _glfwCreateContextEGL(_GLFWwindow* window, const _GLFWctxconfig* ctxconfig, const _GLFWfbconfig* fbconfig); #if defined(_GLFW_X11) -GLFWbool _glfwChooseVisualEGL(const _GLFWctxconfig* ctxconfig, +GLFWbool _glfwChooseVisualEGL(const _GLFWwndconfig* wndconfig, + const _GLFWctxconfig* ctxconfig, const _GLFWfbconfig* fbconfig, Visual** visual, int* depth); #endif /*_GLFW_X11*/ diff --git a/src/glx_context.c b/src/glx_context.c index e545fa0f..9d02a6fa 100644 --- a/src/glx_context.c +++ b/src/glx_context.c @@ -47,7 +47,10 @@ static int getGLXFBConfigAttrib(GLXFBConfig fbconfig, int attrib) // Return the GLXFBConfig most closely matching the specified hints // -static GLFWbool chooseGLXFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* result) +static GLFWbool chooseGLXFBConfig( + const _GLFWfbconfig* desired, + GLXFBConfig* result, + GLFWbool findTransparent) { GLXFBConfig* nativeConfigs; _GLFWfbconfig* usableConfigs; @@ -56,6 +59,10 @@ static GLFWbool chooseGLXFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* res const char* vendor; GLFWbool trustWindowBit = GLFW_TRUE; + if ( !(_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 chooseGLXFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* res usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig)); usableCount = 0; +selectionloop: for (i = 0; i < nativeCount; i++) { const GLXFBConfig n = nativeConfigs[i]; @@ -89,6 +97,27 @@ static GLFWbool chooseGLXFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* res 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 ) { + XFree( visualinfo ); + continue; + } + + if( !pictFormat->direct.alphaMask ) { + XFree( visualinfo ); + continue; + } + XFree( visualinfo ); + } + u->redBits = getGLXFBConfigAttrib(n, GLX_RED_SIZE); u->greenBits = getGLXFBConfigAttrib(n, GLX_GREEN_SIZE); u->blueBits = getGLXFBConfigAttrib(n, GLX_BLUE_SIZE); @@ -118,6 +147,12 @@ static GLFWbool chooseGLXFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* res u->handle = (uintptr_t) 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) @@ -442,7 +477,7 @@ GLFWbool _glfwCreateContextGLX(_GLFWwindow* window, if (ctxconfig->share) share = ctxconfig->share->context.glx.handle; - if (!chooseGLXFBConfig(fbconfig, &native)) + if (!chooseGLXFBConfig(fbconfig, &native, window->transparent)) { _glfwInputError(GLFW_FORMAT_UNAVAILABLE, "GLX: Failed to find a suitable GLXFBConfig"); @@ -622,14 +657,15 @@ GLFWbool _glfwCreateContextGLX(_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 (!chooseGLXFBConfig(fbconfig, &native)) + if (!chooseGLXFBConfig(fbconfig, &native, wndconfig->transparent)) { _glfwInputError(GLFW_FORMAT_UNAVAILABLE, "GLX: Failed to find a suitable GLXFBConfig"); @@ -645,7 +681,7 @@ GLFWbool _glfwChooseVisualGLX(const _GLFWctxconfig* ctxconfig, } *visual = result->visual; - *depth = result->depth; + *depth = result->depth; XFree(result); return GLFW_TRUE; diff --git a/src/glx_context.h b/src/glx_context.h index 30743c11..f767cb14 100644 --- a/src/glx_context.h +++ b/src/glx_context.h @@ -168,14 +168,14 @@ typedef struct _GLFWlibraryGLX } _GLFWlibraryGLX; - GLFWbool _glfwInitGLX(void); void _glfwTerminateGLX(void); 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); diff --git a/src/internal.h b/src/internal.h index a95d1f86..01517ec1 100644 --- a/src/internal.h +++ b/src/internal.h @@ -299,6 +299,7 @@ struct _GLFWwndconfig GLFWbool resizable; GLFWbool visible; GLFWbool decorated; + GLFWbool transparent; GLFWbool focused; GLFWbool autoIconify; GLFWbool floating; @@ -402,6 +403,7 @@ struct _GLFWwindow // Window settings and state GLFWbool resizable; GLFWbool decorated; + GLFWbool transparent; GLFWbool autoIconify; GLFWbool floating; GLFWbool shouldClose; diff --git a/src/window.c b/src/window.c index 5c33217d..e8a68b61 100644 --- a/src/window.c +++ b/src/window.c @@ -180,6 +180,7 @@ GLFWAPI GLFWwindow* glfwCreateWindow(int width, int height, window->monitor = (_GLFWmonitor*) 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; @@ -249,6 +250,7 @@ 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; @@ -327,6 +329,9 @@ GLFWAPI void glfwWindowHint(int hint, int value) case GLFW_DECORATED: _glfw.hints.window.decorated = value ? GLFW_TRUE : GLFW_FALSE; return; + case GLFW_TRANSPARENT: + _glfw.hints.window.transparent = value ? GLFW_TRUE : GLFW_FALSE; + return; case GLFW_FOCUSED: _glfw.hints.window.focused = value ? GLFW_TRUE : GLFW_FALSE; return; @@ -728,6 +733,8 @@ 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_AUTO_ICONIFY: diff --git a/src/x11_init.c b/src/x11_init.c index 3bf07d2d..195c8ce4 100644 --- a/src/x11_init.c +++ b/src/x11_init.c @@ -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; } diff --git a/src/x11_platform.h b/src/x11_platform.h index 39eaec05..9890f703 100644 --- a/src/x11_platform.h +++ b/src/x11_platform.h @@ -162,10 +162,20 @@ typedef VkBool32 (APIENTRY *PFN_vkGetPhysicalDeviceXcbPresentationSupportKHR)(Vk #define _GLFW_EGL_NATIVE_DISPLAY ((EGLNativeDisplayType) _glfw.x11.display) #define _GLFW_PLATFORM_WINDOW_STATE _GLFWwindowX11 x11 -#define _GLFW_PLATFORM_LIBRARY_WINDOW_STATE _GLFWlibraryX11 x11 +#define _GLFW_PLATFORM_LIBRARY_WINDOW_STATE _GLFWlibraryX11 x11 ; _GLFWlibraryXrender xrender #define _GLFW_PLATFORM_MONITOR_STATE _GLFWmonitorX11 x11 #define _GLFW_PLATFORM_CURSOR_STATE _GLFWcursorX11 x11 +// 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 + // X11-specific per-window data // @@ -375,6 +385,22 @@ typedef struct _GLFWlibraryX11 } _GLFWlibraryX11; +// 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; + // X11-specific per-monitor data // typedef struct _GLFWmonitorX11 diff --git a/src/x11_window.c b/src/x11_window.c index 26ea0897..3addee6c 100644 --- a/src/x11_window.c +++ b/src/x11_window.c @@ -1905,14 +1905,14 @@ int _glfwPlatformCreateWindow(_GLFWwindow* window, { if (!_glfwInitGLX()) return GLFW_FALSE; - if (!_glfwChooseVisualGLX(ctxconfig, fbconfig, &visual, &depth)) + if (!_glfwChooseVisualGLX(wndconfig, ctxconfig, fbconfig, &visual, &depth)) return GLFW_FALSE; } else if (ctxconfig->source == GLFW_EGL_CONTEXT_API) { if (!_glfwInitEGL()) return GLFW_FALSE; - if (!_glfwChooseVisualEGL(ctxconfig, fbconfig, &visual, &depth)) + if (!_glfwChooseVisualEGL(wndconfig, ctxconfig, fbconfig, &visual, &depth)) return GLFW_FALSE; } else if (ctxconfig->source == GLFW_OSMESA_CONTEXT_API)