// Unit tests for MixEffect.
-#include "test_util.h"
+#include <GL/glew.h>
+
+#include "effect_chain.h"
#include "gtest/gtest.h"
+#include "image_format.h"
+#include "input.h"
#include "mix_effect.h"
+#include "test_util.h"
+
+namespace movit {
TEST(MixEffectTest, FiftyFiftyMix) {
float data_a[] = {
TEST(MixEffectTest, DoesNotSumToOne) {
float data_a[] = {
- 1.0f, 0.5f,
- 0.75f, 1.0f,
+ 1.0f, 0.5f, 0.75f, 0.333f,
};
float data_b[] = {
- 1.0f, 0.25f,
- 0.15f, 0.6f,
+ 1.0f, 0.25f, 0.15f, 0.333f,
};
+
+ // The fact that the RGB values don't sum but get averaged here might
+ // actually be a surprising result, but when you think of it,
+ // it does make physical sense.
float expected_data[] = {
- 0.0f, 0.25f,
- 0.6f, 0.4f,
+ 1.0f, 0.375f, 0.45f, 0.666f,
};
+
float out_data[4];
- EffectChainTester tester(data_a, 2, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ EffectChainTester tester(data_a, 1, 1, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
Effect *input1 = tester.get_chain()->last_added_effect();
- Effect *input2 = tester.add_input(data_b, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ 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_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+ 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, 2, 2);
+ 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[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);
}
TEST(MixEffectTest, MixesLinearlyDespitesRGBInputsAndOutputs) {
expect_equal(expected_data, out_data, 2, 2);
}
+
+} // namespace movit