git.sesse.net Git - movit/blob - mix_effect_test.cpp

   1 // Unit tests for MixEffect.
   2
   3 #include <GL/glew.h>
   4
   5 #include "effect_chain.h"
   6 #include "gtest/gtest.h"
   7 #include "image_format.h"
   8 #include "input.h"
   9 #include "mix_effect.h"
  10 #include "test_util.h"
  11
  12 TEST(MixEffectTest, FiftyFiftyMix) {
  13         float data_a[] = {
  14                 0.0f, 0.25f,
  15                 0.75f, 1.0f,
  16         };
  17         float data_b[] = {
  18                 1.0f, 0.5f,
  19                 0.75f, 0.6f,
  20         };
  21         float expected_data[] = {
  22                 0.5f, 0.375f,
  23                 0.75f, 0.8f,
  24         };
  25         float out_data[4];
  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);
  29
  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);
  34
  35         expect_equal(expected_data, out_data, 2, 2);
  36 }
  37
  38 TEST(MixEffectTest, OnlyA) {
  39         float data_a[] = {
  40                 0.0f, 0.25f,
  41                 0.75f, 1.0f,
  42         };
  43         float data_b[] = {
  44                 1.0f, 0.5f,
  45                 0.75f, 0.6f,
  46         };
  47         float out_data[4];
  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);
  51
  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);
  56
  57         expect_equal(data_a, out_data, 2, 2);
  58 }
  59
  60 TEST(MixEffectTest, DoesNotSumToOne) {
  61         float data_a[] = {
  62                 1.0f, 0.5f, 0.75f, 0.333f,
  63         };
  64         float data_b[] = {
  65                 1.0f, 0.25f, 0.15f, 0.333f,
  66         };
  67
  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,
  73         };
  74
  75         float out_data[4];
  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);
  79
  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);
  84
  85         expect_equal(expected_data, out_data, 4, 1);
  86 }
  87
  88 TEST(MixEffectTest, AdditiveBlendingWorksForBothTotallyOpaqueAndPartiallyTranslucent) {
  89         float data_a[] = {
  90                 0.0f, 0.5f, 0.75f, 1.0f,
  91                 1.0f, 1.0f, 1.0f, 0.2f,
  92         };
  93         float data_b[] = {
  94                 1.0f, 0.25f, 0.15f, 1.0f,
  95                 1.0f, 1.0f, 1.0f, 0.5f,
  96         };
  97
  98         float expected_data[] = {
  99                 1.0f, 0.75f, 0.9f, 1.0f,
 100                 1.0f, 1.0f, 1.0f, 0.7f,
 101         };
 102
 103         float out_data[4];
 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);
 107
 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);
 112
 113         expect_equal(expected_data, out_data, 4, 2);
 114 }
 115
 116 TEST(MixEffectTest, MixesLinearlyDespitesRGBInputsAndOutputs) {
 117         float data_a[] = {
 118                 0.0f, 0.25f,
 119                 0.75f, 1.0f,
 120         };
 121         float data_b[] = {
 122                 0.0f, 0.0f,
 123                 0.0f, 0.0f,
 124         };
 125         float expected_data[] = {  // sRGB(0.5 * inv_sRGB(a)).
 126                 0.00000f, 0.17349f,
 127                 0.54807f, 0.73536f,
 128         };
 129         float out_data[4];
 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);
 133
 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);
 138
 139         expect_equal(expected_data, out_data, 2, 2);
 140 }