+
+// An effect that multiplies with a constant. Used below.
+class MultiplyEffect : public Effect {
+public:
+ MultiplyEffect() { register_float("factor", &factor); }
+ virtual std::string effect_type_id() const { return "MultiplyEffect"; }
+ std::string output_fragment_shader() { return read_file("multiply.frag"); }
+ virtual AlphaHandling alpha_handling() const { return DONT_CARE_ALPHA_TYPE; }
+
+private:
+ float factor;
+};
+
+// An effect that adds its two inputs together. Used below.
+class AddEffect : public Effect {
+public:
+ AddEffect() {}
+ virtual std::string effect_type_id() const { return "AddEffect"; }
+ std::string output_fragment_shader() { return read_file("add.frag"); }
+ virtual unsigned num_inputs() const { return 2; }
+ virtual AlphaHandling alpha_handling() const { return DONT_CARE_ALPHA_TYPE; }
+};
+
+// Constructs the graph
+//
+// FlatInput |
+// / \ |
+// MultiplyEffect MultiplyEffect |
+// \ / |
+// AddEffect |
+//
+// and verifies that it gives the correct output.
+TEST(EffectChainTest, DiamondGraph) {
+ float data[] = {
+ 1.0f, 1.0f,
+ 1.0f, 0.0f,
+ };
+ float expected_data[] = {
+ 2.5f, 2.5f,
+ 2.5f, 0.0f,
+ };
+ float out_data[2 * 2];
+
+ MultiplyEffect *mul_half = new MultiplyEffect();
+ ASSERT_TRUE(mul_half->set_float("factor", 0.5f));
+
+ MultiplyEffect *mul_two = new MultiplyEffect();
+ ASSERT_TRUE(mul_two->set_float("factor", 2.0f));
+
+ EffectChainTester tester(NULL, 2, 2);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_LINEAR;
+
+ FlatInput *input = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, 2, 2);
+ input->set_pixel_data(data);
+
+ tester.get_chain()->add_input(input);
+ tester.get_chain()->add_effect(mul_half, input);
+ tester.get_chain()->add_effect(mul_two, input);
+ tester.get_chain()->add_effect(new AddEffect(), mul_half, mul_two);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ expect_equal(expected_data, out_data, 2, 2);
+}
+
+// Constructs the graph
+//
+// FlatInput |
+// / \ |
+// MultiplyEffect MultiplyEffect |
+// \ | |
+// \ BouncingIdentityEffect |
+// \ / |
+// AddEffect |
+//
+// and verifies that it gives the correct output.
+TEST(EffectChainTest, DiamondGraphWithOneInputUsedInTwoPhases) {
+ float data[] = {
+ 1.0f, 1.0f,
+ 1.0f, 0.0f,
+ };
+ float expected_data[] = {
+ 2.5f, 2.5f,
+ 2.5f, 0.0f,
+ };
+ float out_data[2 * 2];
+
+ MultiplyEffect *mul_half = new MultiplyEffect();
+ ASSERT_TRUE(mul_half->set_float("factor", 0.5f));
+
+ MultiplyEffect *mul_two = new MultiplyEffect();
+ ASSERT_TRUE(mul_two->set_float("factor", 2.0f));
+
+ BouncingIdentityEffect *bounce = new BouncingIdentityEffect();
+
+ EffectChainTester tester(NULL, 2, 2);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_LINEAR;
+
+ FlatInput *input = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, 2, 2);
+ input->set_pixel_data(data);
+
+ tester.get_chain()->add_input(input);
+ tester.get_chain()->add_effect(mul_half, input);
+ tester.get_chain()->add_effect(mul_two, input);
+ tester.get_chain()->add_effect(bounce, mul_two);
+ tester.get_chain()->add_effect(new AddEffect(), mul_half, bounce);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ expect_equal(expected_data, out_data, 2, 2);
+}
+
+TEST(EffectChainTest, EffectUsedTwiceOnlyGetsOneGammaConversion) {
+ float data[] = {
+ 0.735f, 0.0f,
+ 0.735f, 0.0f,
+ };
+ float expected_data[] = {
+ 0.0f, 0.5f, // 0.5 and not 1.0, since AddEffect doesn't clamp alpha properly.
+ 0.0f, 0.5f,
+ };
+ float out_data[2 * 2];
+
+ EffectChainTester tester(NULL, 2, 2);
+ tester.add_input(data, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_sRGB);
+
+ // MirrorEffect does not get linear light, so the conversions will be
+ // inserted after it, not before.
+ RewritingEffect<MirrorEffect> *effect = new RewritingEffect<MirrorEffect>();
+ tester.get_chain()->add_effect(effect);
+
+ Effect *identity1 = tester.get_chain()->add_effect(new IdentityEffect(), effect);
+ Effect *identity2 = tester.get_chain()->add_effect(new IdentityEffect(), effect);
+ tester.get_chain()->add_effect(new AddEffect(), identity1, identity2);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ expect_equal(expected_data, out_data, 2, 2);
+
+ Node *node = effect->replaced_node;
+ ASSERT_EQ(1, node->incoming_links.size());
+ ASSERT_EQ(1, node->outgoing_links.size());
+ EXPECT_EQ("FlatInput", node->incoming_links[0]->effect->effect_type_id());
+ EXPECT_EQ("GammaExpansionEffect", node->outgoing_links[0]->effect->effect_type_id());
+}
+
+TEST(EffectChainTest, EffectUsedTwiceOnlyGetsOneColorspaceConversion) {
+ float data[] = {
+ 0.5f, 0.0f,
+ 0.5f, 0.0f,
+ };
+ float expected_data[] = {
+ 0.0f, 0.5f, // 0.5 and not 1.0, since AddEffect doesn't clamp alpha properly.
+ 0.0f, 0.5f,
+ };
+ float out_data[2 * 2];
+
+ EffectChainTester tester(NULL, 2, 2);
+ tester.add_input(data, FORMAT_GRAYSCALE, COLORSPACE_REC_601_625, GAMMA_LINEAR);
+
+ // MirrorEffect does not get linear light, so the conversions will be
+ // inserted after it, not before.
+ RewritingEffect<MirrorEffect> *effect = new RewritingEffect<MirrorEffect>();
+ tester.get_chain()->add_effect(effect);
+
+ Effect *identity1 = tester.get_chain()->add_effect(new IdentityEffect(), effect);
+ Effect *identity2 = tester.get_chain()->add_effect(new IdentityEffect(), effect);
+ tester.get_chain()->add_effect(new AddEffect(), identity1, identity2);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ expect_equal(expected_data, out_data, 2, 2);
+
+ Node *node = effect->replaced_node;
+ ASSERT_EQ(1, node->incoming_links.size());
+ ASSERT_EQ(1, node->outgoing_links.size());
+ EXPECT_EQ("FlatInput", node->incoming_links[0]->effect->effect_type_id());
+ EXPECT_EQ("ColorspaceConversionEffect", node->outgoing_links[0]->effect->effect_type_id());
+}
+
+// An effect that does nothing, but requests texture bounce and stores
+// its input size.
+class SizeStoringEffect : public BouncingIdentityEffect {
+public:
+ SizeStoringEffect() : input_width(-1), input_height(-1) {}
+ virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height) {
+ assert(input_num == 0);
+ input_width = width;
+ input_height = height;
+ }
+ virtual std::string effect_type_id() const { return "SizeStoringEffect"; }
+
+ int input_width, input_height;
+};
+
+TEST(EffectChainTest, SameInputsGiveSameOutputs) {
+ float data[2 * 2] = {
+ 0.0f, 0.0f,
+ 0.0f, 0.0f,
+ };
+ float out_data[2 * 2];
+
+ EffectChainTester tester(NULL, 4, 3); // Note non-square aspect.
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_LINEAR;
+
+ FlatInput *input1 = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, 2, 2);
+ input1->set_pixel_data(data);
+
+ FlatInput *input2 = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, 2, 2);
+ input2->set_pixel_data(data);
+
+ SizeStoringEffect *input_store = new SizeStoringEffect();
+
+ tester.get_chain()->add_input(input1);
+ tester.get_chain()->add_input(input2);
+ tester.get_chain()->add_effect(new AddEffect(), input1, input2);
+ tester.get_chain()->add_effect(input_store);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ EXPECT_EQ(2, input_store->input_width);
+ EXPECT_EQ(2, input_store->input_height);
+}
+
+TEST(EffectChainTest, AspectRatioConversion) {
+ float data1[4 * 3] = {
+ 0.0f, 0.0f, 0.0f, 0.0f,
+ 0.0f, 0.0f, 0.0f, 0.0f,
+ 0.0f, 0.0f, 0.0f, 0.0f,
+ };
+ float data2[7 * 7] = {
+ 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
+ 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
+ 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
+ 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
+ 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
+ 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
+ 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
+ };
+
+ // The right conversion here is that the 7x7 image decides the size,
+ // since it is the biggest, so everything is scaled up to 9x7
+ // (keep the height, round the width 9.333 to 9).
+ float out_data[9 * 7];
+
+ EffectChainTester tester(NULL, 4, 3);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_LINEAR;
+
+ FlatInput *input1 = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, 4, 3);
+ input1->set_pixel_data(data1);
+
+ FlatInput *input2 = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, 7, 7);
+ input2->set_pixel_data(data2);
+
+ SizeStoringEffect *input_store = new SizeStoringEffect();
+
+ tester.get_chain()->add_input(input1);
+ tester.get_chain()->add_input(input2);
+ tester.get_chain()->add_effect(new AddEffect(), input1, input2);
+ tester.get_chain()->add_effect(input_store);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ EXPECT_EQ(9, input_store->input_width);
+ EXPECT_EQ(7, input_store->input_height);
+}
+
+// An effect that does nothing except changing its output sizes.
+class VirtualResizeEffect : public Effect {
+public:
+ VirtualResizeEffect(int width, int height, int virtual_width, int virtual_height)
+ : width(width),
+ height(height),
+ virtual_width(virtual_width),
+ virtual_height(virtual_height) {}
+ virtual std::string effect_type_id() const { return "VirtualResizeEffect"; }
+ std::string output_fragment_shader() { return read_file("identity.frag"); }
+
+ virtual bool changes_output_size() const { return true; }
+
+ virtual void get_output_size(unsigned *width, unsigned *height,
+ unsigned *virtual_width, unsigned *virtual_height) const {
+ *width = this->width;
+ *height = this->height;
+ *virtual_width = this->virtual_width;
+ *virtual_height = this->virtual_height;
+ }
+
+private:
+ int width, height, virtual_width, virtual_height;
+};
+
+TEST(EffectChainTest, VirtualSizeIsSentOnToInputs) {
+ const int size = 2, bigger_size = 3;
+ float data[size * size] = {
+ 1.0f, 0.0f,
+ 0.0f, 1.0f,
+ };
+ float out_data[size * size];
+
+ EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ SizeStoringEffect *size_store = new SizeStoringEffect();
+
+ tester.get_chain()->add_effect(new VirtualResizeEffect(size, size, bigger_size, bigger_size));
+ tester.get_chain()->add_effect(size_store);
+ tester.get_chain()->add_effect(new VirtualResizeEffect(size, size, size, size));
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ EXPECT_EQ(bigger_size, size_store->input_width);
+ EXPECT_EQ(bigger_size, size_store->input_height);
+
+ // If the resize is implemented as non-virtual, we'll fail here,
+ // since bilinear scaling from 2x2 → 3x3 → 2x2 is not very exact.
+ expect_equal(data, out_data, size, size);
+}