Allow graceful no-error failure in CastStateValues.

src/libANGLE/Context.cpp

@@ -6612,7 +6612,7 @@ void Context::getFloatvRobust(GLenum pname, GLsizei bufSize, GLsizei *length, GL
 
 void Context::getIntegerv(GLenum pname, GLint *params)
 {
-    GLenum nativeType;
+    GLenum nativeType      = GL_NONE;
     unsigned int numParams = 0;
     getQueryParameterInfo(pname, &nativeType, &numParams);
 

src/libANGLE/queryconversions.cpp

@@ -220,7 +220,9 @@ void CastStateValues(const Context *context,
         }
     }
     else
-        UNREACHABLE();
+    {
+        WARN() << "Application querying parameter that does not exist.";
+    }
 }
 
 // Explicit template instantiation (how we export template functions in different files)

src/tests/gl_tests/ContextNoErrorTest.cpp

@@ -141,6 +141,17 @@ TEST_P(ContextNoErrorTest31, DrawWithPPO)
     EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::red);
 }
 
+// Tests that an incorrect enum to GetInteger does not cause an application crash.
+TEST_P(ContextNoErrorTest, InvalidGetIntegerDoesNotCrash)
+{
+    ANGLE_SKIP_TEST_IF(!IsGLExtensionEnabled("GL_KHR_no_error"));
+
+    GLint value = 1;
+    glGetIntegerv(GL_TEXTURE_2D, &value);
+    EXPECT_GL_NO_ERROR();
+    EXPECT_EQ(value, 1);
+}
+
 ANGLE_INSTANTIATE_TEST_ES2_AND_ES3(ContextNoErrorTest);
 
 GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(ContextNoErrorTest31);