// Unit tests for EffectChain.
+//
+// Note that this also contains the tests for some of the simpler effects.
#include "effect_chain.h"
#include "flat_input.h"
-#include "sandbox_effect.h"
-#include "opengl.h"
#include "gtest/gtest.h"
+#include "mirror_effect.h"
+#include "opengl.h"
+#include "test_util.h"
-#include <stdio.h>
-#include <math.h>
+TEST(EffectChainTest, EmptyChain) {
+ float data[] = {
+ 0.0f, 0.25f, 0.3f,
+ 0.75f, 1.0f, 1.0f,
+ };
+ float out_data[6];
+ EffectChainTester tester(data, 3, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
-#include <algorithm>
+ expect_equal(data, out_data, 3, 2);
+}
-class EffectChainTester {
+// An effect that does nothing.
+class IdentityEffect : public Effect {
public:
- EffectChainTester(const float *data, unsigned width, unsigned height, ColorSpace color_space, GammaCurve gamma_curve)
- : chain(width, height), width(width), height(height)
- {
- ImageFormat format;
- format.color_space = color_space;
- format.gamma_curve = gamma_curve;
-
- FlatInput *input = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, width, height);
- input->set_pixel_data(data);
- chain.add_input(input);
- }
-
- EffectChain *get_chain() { return &chain; }
+ IdentityEffect() {}
+ virtual std::string effect_type_id() const { return "IdentityEffect"; }
+ std::string output_fragment_shader() { return read_file("identity.frag"); }
+};
- void run(float *out_data, ColorSpace color_space, GammaCurve gamma_curve)
- {
- ImageFormat format;
- format.color_space = color_space;
- format.gamma_curve = gamma_curve;
- chain.add_output(format);
- chain.finalize();
+TEST(EffectChainTest, Identity) {
+ float data[] = {
+ 0.0f, 0.25f, 0.3f,
+ 0.75f, 1.0f, 1.0f,
+ };
+ float out_data[6];
+ EffectChainTester tester(data, 3, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ tester.get_chain()->add_effect(new IdentityEffect());
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
- glViewport(0, 0, width, height);
- chain.render_to_screen();
+ expect_equal(data, out_data, 3, 2);
+}
- glReadPixels(0, 0, width, height, GL_RED, GL_FLOAT, out_data);
+// An effect that does nothing, but requests texture bounce.
+class BouncingIdentityEffect : public Effect {
+public:
+ BouncingIdentityEffect() {}
+ virtual std::string effect_type_id() const { return "IdentityEffect"; }
+ std::string output_fragment_shader() { return read_file("identity.frag"); }
+ bool needs_texture_bounce() const { return true; }
+};
- // Flip upside-down to compensate for different origin.
- for (unsigned y = 0; y < height / 2; ++y) {
- unsigned flip_y = height - y - 1;
- for (unsigned x = 0; x < width; ++x) {
- std::swap(out_data[y * width + x], out_data[flip_y * width + x]);
- }
- }
- }
+TEST(EffectChainTest, TextureBouncePreservesIdentity) {
+ float data[] = {
+ 0.0f, 0.25f, 0.3f,
+ 0.75f, 1.0f, 1.0f,
+ };
+ float out_data[6];
+ EffectChainTester tester(data, 3, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ tester.get_chain()->add_effect(new BouncingIdentityEffect());
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
-private:
- EffectChain chain;
- unsigned width, height;
-};
+ expect_equal(data, out_data, 3, 2);
+}
-void expect_equal(const float *ref, const float *result, unsigned width, unsigned height)
-{
- float largest_difference = -1.0f;
- float squared_difference = 0.0f;
-
- for (unsigned y = 0; y < height; ++y) {
- for (unsigned x = 0; x < width; ++x) {
- float diff = ref[y * width + x] - result[y * width + x];
- largest_difference = std::max(largest_difference, fabsf(diff));
- squared_difference += diff * diff;
- }
- }
+TEST(MirrorTest, BasicTest) {
+ float data[] = {
+ 0.0f, 0.25f, 0.3f,
+ 0.75f, 1.0f, 1.0f,
+ };
+ float expected_data[6] = {
+ 0.3f, 0.25f, 0.0f,
+ 1.0f, 1.0f, 0.75f,
+ };
+ float out_data[6];
+ EffectChainTester tester(data, 3, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ tester.get_chain()->add_effect(new MirrorEffect());
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
- const float largest_difference_limit = 1.5 / 255.0;
- const float rms_limit = 0.5 / 255.0;
+ expect_equal(expected_data, out_data, 3, 2);
+}
- EXPECT_LT(largest_difference, largest_difference_limit);
+// A dummy effect that inverts its input.
+class InvertEffect : public Effect {
+public:
+ InvertEffect() {}
+ virtual std::string effect_type_id() const { return "InvertEffect"; }
+ std::string output_fragment_shader() { return read_file("invert_effect.frag"); }
+};
- float rms = sqrt(squared_difference) / (width * height);
- EXPECT_LT(rms, rms_limit);
+// Like IdentityEffect, but rewrites itself out of the loop,
+// splicing in a InvertEffect instead. Also stores the new node,
+// so we later can check that there are gamma conversion effects
+// on both sides.
+class RewritingToInvertEffect : public Effect {
+public:
+ RewritingToInvertEffect() {}
+ virtual std::string effect_type_id() const { return "RewritingToInvertEffect"; }
+ std::string output_fragment_shader() { EXPECT_TRUE(false); return read_file("identity.frag"); }
+ virtual void rewrite_graph(EffectChain *graph, Node *self) {
+ Node *invert_node = graph->add_node(new InvertEffect());
+ graph->replace_receiver(self, invert_node);
+ graph->replace_sender(self, invert_node);
+
+ self->disabled = true;
+ this->invert_node = invert_node;
+ }
- if (largest_difference >= largest_difference_limit || rms >= rms_limit) {
- fprintf(stderr, "Dumping matrices for easier debugging, since at least one test failed.\n");
+ Node *invert_node;
+};
- fprintf(stderr, "Reference:\n");
- for (unsigned y = 0; y < height; ++y) {
- for (unsigned x = 0; x < width; ++x) {
- fprintf(stderr, "%7.4f ", ref[y * width + x]);
- }
- fprintf(stderr, "\n");
- }
+TEST(EffectChainTest, RewritingWorksAndGammaConversionsAreInserted) {
+ float data[] = {
+ 0.0f, 0.25f, 0.3f,
+ 0.75f, 1.0f, 1.0f,
+ };
+ float expected_data[6] = {
+ 1.0f, 0.9771f, 0.9673f,
+ 0.7192f, 0.0f, 0.0f,
+ };
+ float out_data[6];
+ EffectChainTester tester(data, 3, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_sRGB);
+ RewritingToInvertEffect *effect = new RewritingToInvertEffect();
+ tester.get_chain()->add_effect(effect);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ Node *node = effect->invert_node;
+ ASSERT_EQ(1, node->incoming_links.size());
+ ASSERT_EQ(1, node->outgoing_links.size());
+ EXPECT_EQ("GammaExpansionEffect", node->incoming_links[0]->effect->effect_type_id());
+ EXPECT_EQ("GammaCompressionEffect", node->outgoing_links[0]->effect->effect_type_id());
+
+ expect_equal(expected_data, out_data, 3, 2);
+}
- fprintf(stderr, "\nResult:\n");
- for (unsigned y = 0; y < height; ++y) {
- for (unsigned x = 0; x < width; ++x) {
- fprintf(stderr, "%7.4f ", result[y * width + x]);
- }
- fprintf(stderr, "\n");
- }
+// Like RewritingToInvertEffect, but splicing in a MirrorEffect instead,
+// which does not need linear light.
+class RewritingToMirrorEffect : public Effect {
+public:
+ RewritingToMirrorEffect() {}
+ virtual std::string effect_type_id() const { return "RewritingToMirrorEffect"; }
+ std::string output_fragment_shader() { EXPECT_TRUE(false); return read_file("identity.frag"); }
+ virtual void rewrite_graph(EffectChain *graph, Node *self) {
+ Node *mirror_node = graph->add_node(new MirrorEffect());
+ graph->replace_receiver(self, mirror_node);
+ graph->replace_sender(self, mirror_node);
+
+ self->disabled = true;
+ this->mirror_node = mirror_node;
}
-}
-TEST(EffectChainTest, Identity) {
+ Node *mirror_node;
+};
+
+TEST(EffectChainTest, NoGammaConversionsWhenLinearLightNotNeeded) {
float data[] = {
0.0f, 0.25f, 0.3f,
0.75f, 1.0f, 1.0f,
};
+ float expected_data[6] = {
+ 0.3f, 0.25f, 0.0f,
+ 1.0f, 1.0f, 0.75f,
+ };
float out_data[6];
- EffectChainTester tester(data, 3, 2, COLORSPACE_sRGB, GAMMA_LINEAR);
- tester.run(out_data, COLORSPACE_sRGB, GAMMA_LINEAR);
+ EffectChainTester tester(data, 3, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_sRGB);
+ RewritingToMirrorEffect *effect = new RewritingToMirrorEffect();
+ tester.get_chain()->add_effect(effect);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_sRGB);
- expect_equal(data, out_data, 3, 2);
+ Node *node = effect->mirror_node;
+ ASSERT_EQ(1, node->incoming_links.size());
+ EXPECT_EQ(0, node->outgoing_links.size());
+ EXPECT_EQ("FlatInput", node->incoming_links[0]->effect->effect_type_id());
+
+ expect_equal(expected_data, out_data, 3, 2);
+}
+
+// The identity effect needs linear light, and thus will get conversions on both sides.
+// Verify that sRGB data is properly converted to and from linear light for the entire ramp.
+TEST(EffectChainTest, IdentityThroughsRGBConversions) {
+ float data[256];
+ for (unsigned i = 0; i < 256; ++i) {
+ data[i] = i / 255.0;
+ };
+ float out_data[256];
+ EffectChainTester tester(data, 256, 1, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_sRGB);
+ tester.get_chain()->add_effect(new IdentityEffect());
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ expect_equal(data, out_data, 256, 1);
+}
+
+// Same, for the Rec. 601/709 gamma curve.
+TEST(EffectChainTest, IdentityThroughRec709) {
+ float data[256];
+ for (unsigned i = 0; i < 256; ++i) {
+ data[i] = i / 255.0;
+ };
+ float out_data[256];
+ EffectChainTester tester(data, 256, 1, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_REC_709);
+ tester.get_chain()->add_effect(new IdentityEffect());
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_REC_709);
+
+ expect_equal(data, out_data, 256, 1);
}