Add a test that verifies resizing works. Incidentially, it is the first test that...
[movit] / effect_chain_test.cpp
index 0161a92..2ae38dd 100644 (file)
@@ -80,3 +80,255 @@ TEST(MirrorTest, BasicTest) {
 
        expect_equal(expected_data, out_data, 3, 2);
 }
 
        expect_equal(expected_data, out_data, 3, 2);
 }
+
+// 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"); }
+};
+
+// 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;
+       }
+
+       Node *invert_node;      
+};
+
+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);
+}
+
+// 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;
+       }
+
+       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, 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);
+
+       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);
+}
+
+// Effectively scales down its input linearly by 4x (and repeating it),
+// which is not attainable without mipmaps.
+class MipmapNeedingEffect : public Effect {
+public:
+       MipmapNeedingEffect() {}
+       virtual bool needs_mipmaps() const { return true; }
+       virtual std::string effect_type_id() const { return "MipmapNeedingEffect"; }
+       std::string output_fragment_shader() { return read_file("mipmap_needing_effect.frag"); }
+       void set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num)
+       {
+               glActiveTexture(GL_TEXTURE0);
+               check_error();
+               glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+               check_error();
+               glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+               check_error();
+       }
+};
+
+TEST(EffectChainTest, MipmapGenerationWorks) {
+       float data[] = {  // In 4x4 blocks.
+               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, 1.0f,
+
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.5f, 0.0f, 0.0f,
+               0.0f, 0.0f, 1.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 1.0f, 1.0f, 0.0f,
+               0.0f, 1.0f, 1.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+       };
+       float expected_data[] = {  // Repeated four times each way.
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+
+               0.125f,   0.125f,   0.125f,   0.125f,
+               0.09375f, 0.09375f, 0.09375f, 0.09375f,
+               1.0f,     1.0f,     1.0f,     1.0f,
+               0.25f,    0.25f,    0.25f,    0.25f,
+       };
+       float out_data[4 * 16];
+       EffectChainTester tester(data, 4, 16, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+       tester.get_chain()->add_effect(new MipmapNeedingEffect());
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(expected_data, out_data, 4, 16);
+}
+
+TEST(EffectChainTest, ResizeDownByFourThenUpByFour) {
+       float data[] = {  // In 4x4 blocks.
+               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, 1.0f,
+
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 0.5f, 0.0f, 0.0f,
+               0.0f, 0.0f, 1.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+               1.0f, 1.0f, 1.0f, 1.0f,
+
+               0.0f, 0.0f, 0.0f, 0.0f,
+               0.0f, 1.0f, 1.0f, 0.0f,
+               0.0f, 1.0f, 1.0f, 0.0f,
+               0.0f, 0.0f, 0.0f, 0.0f,
+       };
+       float expected_data[] = {  // Repeated four times horizontaly, interpolated vertically.
+               0.1250f, 0.1250f, 0.1250f, 0.1250f,
+               0.1250f, 0.1250f, 0.1250f, 0.1250f,
+               0.1211f, 0.1211f, 0.1211f, 0.1211f,
+               0.1133f, 0.1133f, 0.1133f, 0.1133f,
+               0.1055f, 0.1055f, 0.1055f, 0.1055f,
+               0.0977f, 0.0977f, 0.0977f, 0.0977f,
+               0.2070f, 0.2070f, 0.2070f, 0.2070f,
+               0.4336f, 0.4336f, 0.4336f, 0.4336f,
+               0.6602f, 0.6602f, 0.6602f, 0.6602f,
+               0.8867f, 0.8867f, 0.8867f, 0.8867f,
+               0.9062f, 0.9062f, 0.9062f, 0.9062f,
+               0.7188f, 0.7188f, 0.7188f, 0.7188f,
+               0.5312f, 0.5312f, 0.5312f, 0.5312f,
+               0.3438f, 0.3438f, 0.3438f, 0.3438f,
+               0.2500f, 0.2500f, 0.2500f, 0.2500f,
+               0.2500f, 0.2500f, 0.2500f, 0.2500f,
+       };
+       float out_data[4 * 16];
+
+       ResizeEffect *downscale = new ResizeEffect();
+       ASSERT_TRUE(downscale->set_int("width", 1));
+       ASSERT_TRUE(downscale->set_int("height", 4));
+
+       ResizeEffect *upscale = new ResizeEffect();
+       ASSERT_TRUE(upscale->set_int("width", 4));
+       ASSERT_TRUE(upscale->set_int("height", 16));
+
+       EffectChainTester tester(data, 4, 16, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+       tester.get_chain()->add_effect(downscale);
+       tester.get_chain()->add_effect(upscale);
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(expected_data, out_data, 4, 16);
+}