Factor out the GLX versus EGL current context detection code.

It turns out I need to reuse this for GLES symbols when using
GLX_EXT_create_context_es2_profile.
macos/v1.5.9
Eric Anholt 11 years ago
parent d48978c084
commit b251e3ae33
  1. 113
      src/dispatch_common.c

@ -158,6 +158,11 @@ static struct api api = {
static bool library_initialized;
#if PLATFORM_HAS_EGL
static EGLenum
epoxy_egl_get_current_gl_context_api(void);
#endif
static void
library_init(void) __attribute__((constructor));
@ -329,6 +334,58 @@ epoxy_internal_has_gl_extension(const char *ext, bool invalid_op_mode)
}
}
/**
* Tests whether the currently bound context is EGL or GLX, trying to
* avoid loading libraries unless necessary.
*/
static bool
epoxy_current_context_is_glx(void)
{
#if !PLATFORM_HAS_GLX
return false;
#else
/* If the application hasn't explicitly called some of our GLX
* or EGL code but has presumably set up a context on its own,
* then we need to figure out how to getprocaddress anyway.
*
* If there's a public GetProcAddress loaded in the
* application's namespace, then use that.
*/
PFNGLXGETPROCADDRESSARBPROC glx_gpa;
#if PLATFORM_HAS_EGL
PFNEGLGETPROCADDRESSPROC egl_gpa;
#endif
glx_gpa = dlsym(NULL, "glXGetProcAddressARB");
if (glx_gpa && glXGetCurrentContext())
return true;
#if PLATFORM_HAS_EGL
egl_gpa = dlsym(NULL, "eglGetProcAddress");
if (egl_gpa && epoxy_egl_get_current_gl_context_api() != EGL_NONE)
return false;
#endif /* PLATFORM_HAS_EGL */
/* OK, couldn't find anything in the app's address space.
* Presumably they dlopened with RTLD_LOCAL, which hides it
* from us. Just go dlopen()ing likely libraries and try them.
*/
glx_gpa = do_dlsym(&api.glx_handle, GLX_LIB, "glXGetProcAddressARB",
false);
if (glx_gpa && glXGetCurrentContext())
return true;
#if PLATFORM_HAS_EGL
egl_gpa = do_dlsym(&api.egl_handle, "libEGL.so.1", "eglGetProcAddress",
false);
if (egl_gpa && epoxy_egl_get_current_gl_context_api() != EGL_NONE)
return false;
#endif /* PLATFORM_HAS_EGL */
return false;
#endif /* PLATFORM_HAS_GLX */
}
/**
* Returns true if the given GL extension is supported in the current context.
*
@ -523,54 +580,24 @@ epoxy_get_proc_address(const char *name)
#elif defined(__APPLE__)
return epoxy_gl_dlsym(name);
#else
if (api.glx_handle && glXGetCurrentContext()) {
if (epoxy_current_context_is_glx()) {
return glXGetProcAddressARB((const GLubyte *)name);
#if PLATFORM_HAS_EGL
} else if (api.egl_handle &&
epoxy_egl_get_current_gl_context_api() != EGL_NONE) {
return eglGetProcAddress(name);
#endif /* PLATFORM_HAS_EGL */
} else {
/* If the application hasn't explicitly called some of our GLX
* or EGL code but has presumably set up a context on its own,
* then we need to figure out how to getprocaddress anyway.
*
* If there's a public GetProcAddress loaded in the
* application's namespace, then use that.
*/
PFNGLXGETPROCADDRESSARBPROC glx_gpa;
#if PLATFORM_HAS_EGL
PFNEGLGETPROCADDRESSPROC egl_gpa;
if (api.glx_handle && glXGetCurrentContext()) {
GLenum egl_api = epoxy_egl_get_current_gl_context_api();
switch (egl_api) {
case EGL_OPENGL_API:
case EGL_OPENGL_ES_API:
return eglGetProcAddress(name);
case EGL_NONE:
break;
}
}
#endif
glx_gpa = dlsym(NULL, "glXGetProcAddressARB");
if (glx_gpa && glXGetCurrentContext())
return glx_gpa((const GLubyte *)name);
#if PLATFORM_HAS_EGL
egl_gpa = dlsym(NULL, "eglGetProcAddress");
if (egl_gpa && epoxy_egl_get_current_gl_context_api() != EGL_NONE)
return egl_gpa(name);
#endif /* PLATFORM_HAS_EGL */
/* OK, couldn't find anything in the app's address space.
* Presumably they dlopened with RTLD_LOCAL, which hides it
* from us. Just go dlopen()ing likely libraries and try them.
*/
glx_gpa = do_dlsym(&api.glx_handle, GLX_LIB, "glXGetProcAddressARB",
false);
if (glx_gpa && glXGetCurrentContext())
return glx_gpa((const GLubyte *)name);
#if PLATFORM_HAS_EGL
egl_gpa = do_dlsym(&api.egl_handle, "libEGL.so.1", "eglGetProcAddress",
false);
if (egl_gpa && epoxy_egl_get_current_gl_context_api() != EGL_NONE)
return egl_gpa(name);
#endif /* PLATFORM_HAS_EGL */
errx(1, "Couldn't find GLX or EGL libraries.\n");
}
errx(1, "Couldn't find current GLX or EGL context.\n");
#endif
}

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