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Add GLFW_TRANSPARENT and X11 implementation

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
examples/gears.c
View File

@ -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
View File

@ -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.
*

49
src/egl_context.c
View File

@ -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");

3
src/egl_context.h
View File

@ -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*/

44
src/glx_context.c
View File

@ -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");

4
src/glx_context.h
View File

@ -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);

2
src/internal.h
View File

@ -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;

7
src/window.c
View File

@ -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:

49
src/x11_init.c
View File

@ -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;
}

28
src/x11_platform.h
View File

@ -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

4
src/x11_window.c
View File

@ -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)