template<class T>
class RewritingEffect : public Effect {
public:
- RewritingEffect() : effect(new T()), replaced_node(nullptr) {}
+ template<class... Args>
+ RewritingEffect(Args &&... args) : effect(new T(std::forward<Args>(args)...)), replaced_node(nullptr) {}
string effect_type_id() const override { return "RewritingEffect[" + effect->effect_type_id() + "]"; }
string output_fragment_shader() override { EXPECT_TRUE(false); return read_file("identity.frag"); }
void rewrite_graph(EffectChain *graph, Node *self) override {
class MipmapNeedingEffect : public Effect {
public:
MipmapNeedingEffect() {}
- bool needs_mipmaps() const override { return true; }
+ MipmapRequirements needs_mipmaps() const override { return NEEDS_MIPMAPS; }
// To be allowed to mess with the sampler state.
bool needs_texture_bounce() const override { return true; }
expect_equal(expected_data, out_data, 4, 16);
}
+// An effect to verify that you can turn off mipmaps; it downscales by two,
+// which gives blur with mipmaps and aliasing (picks out every other pixel)
+// without.
+class Downscale2xEffect : public Effect {
+public:
+ explicit Downscale2xEffect(MipmapRequirements mipmap_requirements)
+ : mipmap_requirements(mipmap_requirements)
+ {
+ register_vec2("offset", offset);
+ }
+ MipmapRequirements needs_mipmaps() const override { return mipmap_requirements; }
+
+ string effect_type_id() const override { return "Downscale2xEffect"; }
+ string output_fragment_shader() override { return read_file("downscale2x.frag"); }
+
+private:
+ const MipmapRequirements mipmap_requirements;
+ EffectChain *chain;
+ float offset[2] { 0.0f, 0.0f };
+};
+
+TEST(EffectChainTest, MipmapChainGetsSplit) {
+ float data[] = {
+ 0.0f, 0.0f, 0.0f, 0.0f,
+ 1.0f, 0.0f, 1.0f, 0.0f,
+ 0.0f, 0.0f, 0.0f, 0.0f,
+ 1.0f, 0.0f, 1.0f, 0.0f,
+ };
+
+ // The intermediate result after the first step looks like this,
+ // assuming there are no mipmaps (the zeros are due to border behavior):
+ //
+ // 0 0 0 0
+ // 0 0 0 0
+ // 1 1 0 0
+ // 1 1 0 0
+ //
+ // so another 2x downscale towards the bottom left will give
+ //
+ // 0 0
+ // 1 0
+ //
+ // with yet more zeros coming in on the top and the right from the border.
+ float expected_data[] = {
+ 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,
+ };
+ float out_data[4 * 4];
+
+ float offset[] = { -0.5f / 4.0f, -0.5f / 4.0f };
+ RewritingEffect<Downscale2xEffect> *pick_out_bottom_left = new RewritingEffect<Downscale2xEffect>(Effect::CANNOT_ACCEPT_MIPMAPS);
+ ASSERT_TRUE(pick_out_bottom_left->effect->set_vec2("offset", offset));
+
+ RewritingEffect<Downscale2xEffect> *downscale2x = new RewritingEffect<Downscale2xEffect>(Effect::NEEDS_MIPMAPS);
+
+ EffectChainTester tester(data, 4, 4, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+ tester.get_chain()->add_effect(pick_out_bottom_left);
+ tester.get_chain()->add_effect(downscale2x);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ EXPECT_NE(pick_out_bottom_left->replaced_node->containing_phase,
+ downscale2x->replaced_node->containing_phase);
+
+ expect_equal(expected_data, out_data, 4, 4);
+}
+
// An effect that adds its two inputs together. Used below.
class AddEffect : public Effect {
public:
expect_equal(expected_data, out_data, 2, 2);
}
+// Constructs the graph
+//
+// FlatInput |
+// / \ |
+// Downscale2xEffect (mipmaps) Downscale2xEffect (no mipmaps) |
+// | | |
+// Downscale2xEffect (mipmaps) Downscale2xEffect (no mipmaps) |
+// \ / |
+// AddEffect |
+//
+// and verifies that it gives the correct output. Due to the conflicting
+// mipmap demands, EffectChain needs to make two phases; exactly where it's
+// split is less important, though (this is a fairly obscure situation that
+// is unlikely to happen in practice).
+TEST(EffectChainTest, DiamondGraphWithConflictingMipmaps) {
+ float data[] = {
+ 0.0f, 0.0f, 0.0f, 0.0f,
+ 1.0f, 0.0f, 1.0f, 0.0f,
+ 0.0f, 0.0f, 0.0f, 0.0f,
+ 1.0f, 0.0f, 1.0f, 0.0f,
+ };
+
+ // Same situation as MipmapChainGetsSplit. The output of the two
+ // downscales with no mipmaps looks like this:
+ //
+ // 0 0 0 0
+ // 0 0 0 0
+ // 0 0 0 0
+ // 1 0 0 0
+ //
+ // and the one with mipmaps is 0.25 everywhere. Due to postmultiplied
+ // alpha, we get the average even though we are using AddEffect.
+ float expected_data[] = {
+ 0.125f, 0.125f, 0.125f, 0.125f,
+ 0.125f, 0.125f, 0.125f, 0.125f,
+ 0.125f, 0.125f, 0.125f, 0.125f,
+ 0.625f, 0.125f, 0.125f, 0.125f,
+ };
+ float out_data[4 * 4];
+
+ float offset[] = { -0.5f / 4.0f, -0.5f / 4.0f };
+ Downscale2xEffect *nomipmap1 = new Downscale2xEffect(Effect::CANNOT_ACCEPT_MIPMAPS);
+ Downscale2xEffect *nomipmap2 = new Downscale2xEffect(Effect::CANNOT_ACCEPT_MIPMAPS);
+ ASSERT_TRUE(nomipmap1->set_vec2("offset", offset));
+ ASSERT_TRUE(nomipmap2->set_vec2("offset", offset));
+
+ Downscale2xEffect *mipmap1 = new Downscale2xEffect(Effect::NEEDS_MIPMAPS);
+ Downscale2xEffect *mipmap2 = new Downscale2xEffect(Effect::NEEDS_MIPMAPS);
+
+ EffectChainTester tester(nullptr, 4, 4);
+
+ ImageFormat format;
+ format.color_space = COLORSPACE_sRGB;
+ format.gamma_curve = GAMMA_LINEAR;
+
+ FlatInput *input = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, 4, 4);
+ input->set_pixel_data(data);
+
+ tester.get_chain()->add_input(input);
+
+ tester.get_chain()->add_effect(nomipmap1, input);
+ tester.get_chain()->add_effect(nomipmap2, nomipmap1);
+
+ tester.get_chain()->add_effect(mipmap1, input);
+ tester.get_chain()->add_effect(mipmap2, mipmap1);
+
+ tester.get_chain()->add_effect(new AddEffect(), nomipmap2, mipmap2);
+ tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+ expect_equal(expected_data, out_data, 4, 4);
+}
+
TEST(EffectChainTest, EffectUsedTwiceOnlyGetsOneGammaConversion) {
float data[] = {
0.735f, 0.0f,
projects / movit / blobdiff