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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/egl_context.c
+44 -5
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@@ -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");