Refactor DisplayGbm::generateConfigs

Bug: angleproject:4809
Change-Id: I5f352f737bbd53c78d9e01055c17eabd17d5fb8a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2278667
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jiajia Qin <jiajia.qin@intel.com>

src/libANGLE/renderer/gl/egl/gbm/DisplayGbm.cpp

@@ -924,24 +924,36 @@ egl::Error DisplayGbm::makeCurrent(egl::Surface *drawSurface,
 
 egl::ConfigSet DisplayGbm::generateConfigs()
 {
-    egl::ConfigSet configs;
-
-    egl::Config config;
-    config.bufferSize         = 32;
-    config.redSize            = 8;
-    config.greenSize          = 8;
-    config.blueSize           = 8;
-    config.alphaSize          = 8;
-    config.depthSize          = 24;
-    config.stencilSize        = 8;
-    config.bindToTextureRGBA  = EGL_TRUE;
-    config.renderableType     = EGL_OPENGL_ES2_BIT;
-    config.surfaceType        = EGL_WINDOW_BIT | EGL_PBUFFER_BIT;
-    config.renderTargetFormat = GL_RGBA8;
-    config.depthStencilFormat = GL_DEPTH24_STENCIL8;
-
-    configs.add(config);
-    return configs;
+
+    gl::Version eglVersion(mEGL->majorVersion, mEGL->minorVersion);
+    ASSERT(eglVersion >= gl::Version(1, 4));
+
+    bool supportES3 =
+        (eglVersion >= gl::Version(1, 5) || mEGL->hasExtension("EGL_KHR_create_context")) &&
+        (mRenderer->getMaxSupportedESVersion() >= gl::Version(3, 0));
+    EGLint renderType = EGL_OPENGL_ES2_BIT | (supportES3 ? EGL_OPENGL_ES3_BIT : 0);
+
+    // clang-format off
+    std::vector<EGLint> configAttribs8888 =
+    {
+        EGL_COLOR_BUFFER_TYPE, EGL_RGB_BUFFER,
+        // CrOS doesn't support window and pixmaps?
+        EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
+        EGL_CONFIG_CAVEAT, EGL_NONE,
+        EGL_CONFORMANT, renderType,
+        EGL_RENDERABLE_TYPE, renderType,
+        EGL_RED_SIZE, 8,
+        EGL_GREEN_SIZE, 8,
+        EGL_BLUE_SIZE, 8,
+        EGL_ALPHA_SIZE, 8,
+        EGL_BUFFER_SIZE, 32,
+        EGL_DEPTH_SIZE, 24,
+        EGL_NONE
+    };
+    // clang-format on
+
+    mConfigAttribList = configAttribs8888;
+    return DisplayEGL::generateConfigs();
 }
 
 bool DisplayGbm::isValidNativeWindow(EGLNativeWindowType window) const