EGL: Fixed use extension use.

src/glcontext_egl.cpp

@@ -176,6 +176,20 @@ EGL_IMPORT
 			EGLBoolean success = eglInitialize(m_display, &major, &minor);
 			BGFX_FATAL(success && major >= 1 && minor >= 3, Fatal::UnableToInitialize, "Failed to initialize %d.%d", major, minor);
 
+			BX_TRACE("EGL info:");
+			const char* clientApis = eglQueryString(m_display, EGL_CLIENT_APIS);
+			BX_TRACE("   APIs: %s", clientApis);
+
+			const char* vendor = eglQueryString(m_display, EGL_VENDOR);
+			BX_TRACE(" Vendor: %s", vendor);
+
+			const char* version = eglQueryString(m_display, EGL_VERSION);
+			BX_TRACE("Version: %s", version);
+
+			const char* extensions = eglQueryString(m_display, EGL_EXTENSIONS);
+			BX_TRACE("Supported EGL extensions:");
+			dumpExtensions(extensions);
+
 			EGLint attrs[] =
 			{
 				EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
@@ -230,6 +244,9 @@ EGL_IMPORT
 			m_surface = eglCreateWindowSurface(m_display, m_config, nwh, NULL);
 			BGFX_FATAL(m_surface != EGL_NO_SURFACE, Fatal::UnableToInitialize, "Failed to create surface.");
 
+			const bool hasEglKhrCreateContext = !!bx::findIdentifierMatch(extensions, "EGL_KHR_create_context");
+
+			for (uint32_t ii = 0; ii < 2; ++ii)
 			{
 				bx::StaticMemoryBlockWriter writer(s_contextAttrs, sizeof(s_contextAttrs) );
 
@@ -239,19 +256,32 @@ EGL_IMPORT
 				bx::write(&writer, EGLint(EGL_CONTEXT_MINOR_VERSION_KHR) );
 				bx::write(&writer, EGLint(BGFX_CONFIG_RENDERER_OPENGLES % 10) );
 
-				bx::write(&writer, EGLint(EGL_CONTEXT_FLAGS_KHR) );
+				EGLint flags = 0;
 
-				EGLint flags = BGFX_CONFIG_DEBUG ? 0
-					| EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR
-//					| EGL_OPENGL_ES3_BIT_KHR
-					: 0
-					;
-				bx::write(&writer, flags);
+				if (hasEglKhrCreateContext
+				&&  0 == ii)
+				{
+					flags = BGFX_CONFIG_DEBUG ? 0
+						| EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR
+//						| EGL_OPENGL_ES3_BIT_KHR
+						: 0
+						;
+
+					bx::write(&writer, EGLint(EGL_CONTEXT_FLAGS_KHR) );
+					bx::write(&writer, flags);
+				}
 
 				bx::write(&writer, EGLint(EGL_NONE) );
+
+				m_context = eglCreateContext(m_display, m_config, EGL_NO_CONTEXT, s_contextAttrs);
+				if (NULL != m_context)
+				{
+					break;
+				}
+
+				BX_TRACE("Failed to create EGL context with EGL_CONTEXT_FLAGS_KHR (%08x).", flags);
 			}
 
-			m_context = eglCreateContext(m_display, m_config, EGL_NO_CONTEXT, s_contextAttrs);
 			BGFX_FATAL(m_context != EGL_NO_CONTEXT, Fatal::UnableToInitialize, "Failed to create context.");
 
 			success = eglMakeCurrent(m_display, m_surface, m_surface, m_context);