X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=resample_effect_test.cpp;h=211e6d123e65d93dbcc075f60ea8371b1eaa5736;hp=952553681a87834beab57618120c85c42cb661b2;hb=f62661c1bef3acac7b98631970700dfa5ac94768;hpb=9651a4eaae012cdc49c1aa38197861e04f62e91e

diff --git a/resample_effect_test.cpp b/resample_effect_test.cpp
index 9525536..211e6d1 100644
--- a/resample_effect_test.cpp
+++ b/resample_effect_test.cpp
@@ -11,6 +11,8 @@
 #include "resample_effect.h"
 #include "test_util.h"
 
+namespace movit {
+
 namespace {
 
 float sinc(float x)
@@ -166,3 +168,45 @@ TEST(ResampleEffectTest, UpscaleByThreeGetsCorrectPixelCenters) {
 		}
 	}
 }
+
+TEST(ResampleEffectTest, HeavyResampleGetsSumRight) {
+	// Do only one resample pass, more specifically the last one, which goes to
+	// our fp32 output. This allows us to analyze the precision without intermediate
+	// fp16 rounding.
+	const int swidth = 1, sheight = 1280;
+	const int dwidth = 1, dheight = 64;
+
+	float data[swidth * sheight], out_data[dwidth * dheight], expected_data[dwidth * dheight];
+	for (int y = 0; y < sheight; ++y) {
+		for (int x = 0; x < swidth; ++x) {
+			data[y * swidth + x] = 1.0f;
+		}
+	}
+	for (int y = 0; y < dheight; ++y) {
+		for (int x = 0; x < dwidth; ++x) {
+			expected_data[y * dwidth + x] = 1.0f;
+		}
+	}
+
+	EffectChainTester tester(NULL, dwidth, dheight, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR, GL_RGBA32F);
+
+	ImageFormat format;
+	format.color_space = COLORSPACE_sRGB;
+	format.gamma_curve = GAMMA_LINEAR;
+
+	FlatInput *input = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, swidth, sheight);
+	input->set_pixel_data(data);
+
+	tester.get_chain()->add_input(input);
+	Effect *resample_effect = tester.get_chain()->add_effect(new ResampleEffect());
+	ASSERT_TRUE(resample_effect->set_int("width", dwidth));
+	ASSERT_TRUE(resample_effect->set_int("height", dheight));
+	tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	// Require that we are within 10-bit accuracy. Note that this limit is for
+	// one pass only, but the limit is tight enough that it should be good enough
+	// for 10-bit accuracy even after two passes.
+	expect_equal(expected_data, out_data, dwidth, dheight, 0.1 / 1023.0);
+}
+
+}  // namespace movit