+TEST(MixEffectTest, AdditiveBlendingWorksForBothTotallyOpaqueAndPartiallyTranslucent) {
+ float data_a[] = {
+ 0.0f, 0.5f, 0.75f, 1.0f,
+ 1.0f, 1.0f, 1.0f, 0.2f,
+ };
+ float data_b[] = {
+ 1.0f, 0.25f, 0.15f, 1.0f,
+ 1.0f, 1.0f, 1.0f, 0.5f,
+ };
+
+ float expected_data[] = {
+ 1.0f, 0.75f, 0.9f, 1.0f,
+ 1.0f, 1.0f, 1.0f, 0.7f,
+ };
+
+ float out_data[8];
+ EffectChainTester tester(data_a, 1, 2, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
+ Effect *input1 = tester.get_chain()->last_added_effect();
+ Effect *input2 = tester.add_input(data_b, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ Effect *mix_effect = tester.get_chain()->add_effect(new MixEffect(), input1, input2);
+ ASSERT_TRUE(mix_effect->set_float("strength_first", 1.0f));
+ ASSERT_TRUE(mix_effect->set_float("strength_second", 1.0f));
+ tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ expect_equal(expected_data, out_data, 4, 2);
+}
+