Make sure to have a pbuffer-capable config for the temp pbuffer

The temporary pbuffer has to have a config that is pbuffer capable.
Otherwise the makeCurrent() can potentially fail with drivers that
strictly differentiate between the different configurations.

Change-Id: Id63f52da5c5a1308072b1f1bb4b297ea6a547166
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/platformsupport/eglconvenience/qeglplatformcontext.cpp b/src/platformsupport/eglconvenience/qeglplatformcontext.cpp
index 9691d12682..148c5d9b2f 100644
--- a/src/platformsupport/eglconvenience/qeglplatformcontext.cpp
+++ b/src/platformsupport/eglconvenience/qeglplatformcontext.cpp
@@ -256,7 +256,11 @@ void QEGLPlatformContext::updateFormatFromGL()
         EGL_LARGEST_PBUFFER, EGL_FALSE,
         EGL_NONE
     };
-    EGLSurface pbuffer = eglCreatePbufferSurface(m_eglDisplay, m_eglConfig, pbufferAttributes);
+    // Cannot just pass m_eglConfig because it may not be suitable for pbuffers. Instead,
+    // do what QEGLPbuffer would do: request a config with the same attributes but with
+    // PBUFFER_BIT set.
+    EGLConfig config = q_configFromGLFormat(m_eglDisplay, m_format, false, EGL_PBUFFER_BIT);
+    EGLSurface pbuffer = eglCreatePbufferSurface(m_eglDisplay, config, pbufferAttributes);
     if (pbuffer == EGL_NO_SURFACE)
         return;