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windows: Use EGL extensions as they ought to be used

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We take some shortcuts still because we know that with ANGLE the header
with the extension constants is always available. A proper implementation
would not rely on the constants being available and would dynamically
check for the extension and would take care of defining the constants if
not available. However, just getting the extension list to check if the
functions needed to get the display are available is already a chicken-egg
problem so we won't go there.

Using eglGetProcAddress properly solves the issues with static builds too
since this always works.

Task-number: QTBUG-46284
Change-Id: Iff23669ebacaffa0c5f76fd2c928af689307874f
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Gunnar Roth
Reviewed-by: Andrew Knight <andrew.knight@intopalo.com>
This commit is contained in:
Laszlo Agocs 2015-05-27 16:12:57 +02:00 committed by Friedemann Kleint
parent bccdb62340
commit a47dbb010f
2 changed files with 13 additions and 6 deletions
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16
src/plugins/platforms/windows/qwindowseglcontext.cpp
View File

@ -39,7 +39,6 @@
#include <QtGui/QOpenGLContext>
#if defined(QT_OPENGL_ES_2_ANGLE) || defined(QT_OPENGL_DYNAMIC)
# define EGL_EGLEXT_PROTOTYPES
# include <QtANGLE/EGL/eglext.h>
#endif
@ -137,7 +136,6 @@ bool QWindowsLibEGL::init()
eglGetError = RESOLVE((EGLint (EGLAPIENTRY *)(void)), eglGetError);
eglGetDisplay = RESOLVE((EGLDisplay (EGLAPIENTRY *)(EGLNativeDisplayType)), eglGetDisplay);
eglGetPlatformDisplayEXT = RESOLVE((EGLDisplay (EGLAPIENTRY *)(EGLenum platform, void *native_display, const EGLint *attrib_list)), eglGetPlatformDisplayEXT);
eglInitialize = RESOLVE((EGLBoolean (EGLAPIENTRY *)(EGLDisplay, EGLint *, EGLint *)), eglInitialize);
eglTerminate = RESOLVE((EGLBoolean (EGLAPIENTRY *)(EGLDisplay)), eglTerminate);
eglChooseConfig = RESOLVE((EGLBoolean (EGLAPIENTRY *)(EGLDisplay, const EGLint *, EGLConfig *, EGLint, EGLint *)), eglChooseConfig);
@ -156,7 +154,15 @@ bool QWindowsLibEGL::init()
eglSwapBuffers = RESOLVE((EGLBoolean (EGLAPIENTRY *)(EGLDisplay , EGLSurface)), eglSwapBuffers);
eglGetProcAddress = RESOLVE((__eglMustCastToProperFunctionPointerType (EGLAPIENTRY * )(const char *)), eglGetProcAddress);
return eglGetError && eglGetDisplay && eglInitialize;
if (!eglGetError || !eglGetDisplay || !eglInitialize || !eglGetProcAddress)
return false;
eglGetPlatformDisplayEXT = 0;
#ifdef EGL_ANGLE_platform_angle
eglGetPlatformDisplayEXT = reinterpret_cast<EGLDisplay (EGLAPIENTRY *)(EGLenum, void *, const EGLint *)>(eglGetProcAddress("eglGetPlatformDisplayEXT"));
#endif
return true;
}
#if !defined(QT_STATIC) || defined(QT_OPENGL_DYNAMIC)
@ -360,7 +366,7 @@ QWindowsEGLStaticContext *QWindowsEGLStaticContext::create(QWindowsOpenGLTester:
EGLDisplay display = EGL_NO_DISPLAY;
EGLint major = 0;
EGLint minor = 0;
#ifdef EGL_ANGLE_platform_angle_opengl
#ifdef EGL_ANGLE_platform_angle
if (libEGL.eglGetPlatformDisplayEXT
&& (preferredType & QWindowsOpenGLTester::AngleBackendMask)) {
const EGLint anglePlatformAttributes[][5] = {
@ -384,7 +390,7 @@ QWindowsEGLStaticContext *QWindowsEGLStaticContext::create(QWindowsOpenGLTester:
}
}
}
#else // EGL_ANGLE_platform_angle_opengl
#else // EGL_ANGLE_platform_angle
Q_UNUSED(preferredType)
#endif
if (display == EGL_NO_DISPLAY)

3
src/plugins/platforms/windows/qwindowseglcontext.h
View File

@ -46,7 +46,6 @@ struct QWindowsLibEGL
EGLint (EGLAPIENTRY * eglGetError)(void);
EGLDisplay (EGLAPIENTRY * eglGetDisplay)(EGLNativeDisplayType display_id);
EGLDisplay (EGLAPIENTRY * eglGetPlatformDisplayEXT)(EGLenum platform, void *native_display, const EGLint *attrib_list);
EGLBoolean (EGLAPIENTRY * eglInitialize)(EGLDisplay dpy, EGLint *major, EGLint *minor);
EGLBoolean (EGLAPIENTRY * eglTerminate)(EGLDisplay dpy);
EGLBoolean (EGLAPIENTRY * eglChooseConfig)(EGLDisplay dpy, const EGLint *attrib_list,
@ -74,6 +73,8 @@ struct QWindowsLibEGL
EGLBoolean (EGLAPIENTRY * eglSwapBuffers)(EGLDisplay dpy, EGLSurface surface);
__eglMustCastToProperFunctionPointerType (EGLAPIENTRY * eglGetProcAddress)(const char *procname);
EGLDisplay (EGLAPIENTRY * eglGetPlatformDisplayEXT)(EGLenum platform, void *native_display, const EGLint *attrib_list);
private:
#if !defined(QT_STATIC) || defined(QT_OPENGL_DYNAMIC)
void *resolve(const char *name);