X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=mix_effect_test.cpp;h=096ecd5ae03169ee5e9052bfe2207a0140cc6f53;hp=d49efd754b56a964ac171f2cd9b572f4b28c2f5f;hb=6a8b7d750dff76dee320ad973a52d4d9720510b9;hpb=745efab6c4ac0886c03a0387f669226d078b5386;ds=sidebyside

diff --git a/mix_effect_test.cpp b/mix_effect_test.cpp
index d49efd7..096ecd5 100644
--- a/mix_effect_test.cpp
+++ b/mix_effect_test.cpp
@@ -80,6 +80,34 @@ TEST(MixEffectTest, DoesNotSumToOne) {
 	expect_equal(expected_data, out_data, 4, 1);
 }
 
+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[4];
+	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);
+}
+
 TEST(MixEffectTest, MixesLinearlyDespitesRGBInputsAndOutputs) {
 	float data_a[] = {
 		0.0f, 0.25f,