1 // Unit tests for MixEffect.
5 #include "effect_chain.h"
6 #include "gtest/gtest.h"
7 #include "image_format.h"
9 #include "mix_effect.h"
10 #include "test_util.h"
12 TEST(MixEffectTest, FiftyFiftyMix) {
21 float expected_data[] = {
26 EffectChainTester tester(data_a, 2, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
27 Effect *input1 = tester.get_chain()->last_added_effect();
28 Effect *input2 = tester.add_input(data_b, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
30 Effect *mix_effect = tester.get_chain()->add_effect(new MixEffect(), input1, input2);
31 ASSERT_TRUE(mix_effect->set_float("strength_first", 0.5f));
32 ASSERT_TRUE(mix_effect->set_float("strength_second", 0.5f));
33 tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
35 expect_equal(expected_data, out_data, 2, 2);
38 TEST(MixEffectTest, OnlyA) {
48 EffectChainTester tester(data_a, 2, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
49 Effect *input1 = tester.get_chain()->last_added_effect();
50 Effect *input2 = tester.add_input(data_b, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
52 Effect *mix_effect = tester.get_chain()->add_effect(new MixEffect(), input1, input2);
53 ASSERT_TRUE(mix_effect->set_float("strength_first", 1.0f));
54 ASSERT_TRUE(mix_effect->set_float("strength_second", 0.0f));
55 tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
57 expect_equal(data_a, out_data, 2, 2);
60 TEST(MixEffectTest, DoesNotSumToOne) {
62 1.0f, 0.5f, 0.75f, 0.333f,
65 1.0f, 0.25f, 0.15f, 0.333f,
68 // The fact that the RGB values don't sum but get averaged here might
69 // actually be a surprising result, but when you think of it,
70 // it does make physical sense.
71 float expected_data[] = {
72 1.0f, 0.375f, 0.45f, 0.666f,
76 EffectChainTester tester(data_a, 1, 1, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
77 Effect *input1 = tester.get_chain()->last_added_effect();
78 Effect *input2 = tester.add_input(data_b, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
80 Effect *mix_effect = tester.get_chain()->add_effect(new MixEffect(), input1, input2);
81 ASSERT_TRUE(mix_effect->set_float("strength_first", 1.0f));
82 ASSERT_TRUE(mix_effect->set_float("strength_second", 1.0f));
83 tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
85 expect_equal(expected_data, out_data, 4, 1);
88 TEST(MixEffectTest, AdditiveBlendingWorksForBothTotallyOpaqueAndPartiallyTranslucent) {
90 0.0f, 0.5f, 0.75f, 1.0f,
91 1.0f, 1.0f, 1.0f, 0.2f,
94 1.0f, 0.25f, 0.15f, 1.0f,
95 1.0f, 1.0f, 1.0f, 0.5f,
98 float expected_data[] = {
99 1.0f, 0.75f, 0.9f, 1.0f,
100 1.0f, 1.0f, 1.0f, 0.7f,
104 EffectChainTester tester(data_a, 1, 2, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
105 Effect *input1 = tester.get_chain()->last_added_effect();
106 Effect *input2 = tester.add_input(data_b, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
108 Effect *mix_effect = tester.get_chain()->add_effect(new MixEffect(), input1, input2);
109 ASSERT_TRUE(mix_effect->set_float("strength_first", 1.0f));
110 ASSERT_TRUE(mix_effect->set_float("strength_second", 1.0f));
111 tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
113 expect_equal(expected_data, out_data, 4, 2);
116 TEST(MixEffectTest, MixesLinearlyDespitesRGBInputsAndOutputs) {
125 float expected_data[] = { // sRGB(0.5 * inv_sRGB(a)).
130 EffectChainTester tester(data_a, 2, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_sRGB);
131 Effect *input1 = tester.get_chain()->last_added_effect();
132 Effect *input2 = tester.add_input(data_b, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_sRGB);
134 Effect *mix_effect = tester.get_chain()->add_effect(new MixEffect(), input1, input2);
135 ASSERT_TRUE(mix_effect->set_float("strength_first", 0.5f));
136 ASSERT_TRUE(mix_effect->set_float("strength_second", 0.5f));
137 tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_sRGB);
139 expect_equal(expected_data, out_data, 2, 2);